Allegro MicroSystems Sets New Standard for Efficiency in High-Power Systems with Ultra-Low-Loss Isolated Current Sensor

Rhea-AI Summary

Allegro MicroSystems (Nasdaq: ALGM) introduced the ACS37200, an ultra-low-loss galvanically isolated current sensor with a 50 µΩ conductor resistance that targets high-current HEV/EV, industrial, AI data center, and solar inverter systems.

The company says the ACS37200 cuts sensing-related power loss by 90% (reducing a 100A design loss from 5W to 0.5W), shrinks board footprint by 95% versus discrete shunts, and offers certified 1000 VRMS / 1,414 VDC isolation in an 8-pin PSOF package. Datasheets and samples are available now.

Positive

• Conductor resistance of 50 µΩ (industry-leading)
• Power loss reduced by 90% for a 100A example (5W to 0.5W)
• Footprint reduced by 95% versus discrete shunt solutions
• Certified isolation at 1000 VRMS / 1,414 VDC in a surface-mount package
• Integrated design replaces shunt and isolation amp, reducing BOM

Negative

• None.

Key Figures

Conductor resistance 50 µΩ ACS37200 current sensor specification

Power loss reduction 90% Reduction vs typical 0.5 mΩ shunt in 100A design

Shunt resistance baseline 0.5 mΩ Typical shunt resistor in 100A system example

Power wasted as heat 5 watts Typical 100A design using 0.5 mΩ shunt

Reduced power loss 0.5 watts 100A design using ACS37200 at 50 µΩ

Board space reduction 95% Footprint vs traditional discrete shunt solution

Package area 100 mm² PSOF package size for ACS37200

Isolation rating 1000 VRMS / 1,414 VDC Certified galvanic basic isolation per UL 62368-1

Market Reality Check

$31.29 Last Close

Volume Volume 2,147,833 is 1.12x the 20-day average of 1,926,121, indicating modestly elevated interest ahead of this product launch. normal

Technical Shares at $26.91 are trading below the 200-day MA of $28.20, reflecting a still-cautious longer-term trend despite the recent bounce.

Peers on Argus

Peers showed mixed moves, with names like PI and SITM up and CRUS, SMTC, SLAB down modestly. With ALGM up 2.01% and no peers in the momentum scanner, today’s strength appears more company-specific than sector-driven.

Historical Context

Date	Event	Sentiment	Move	Catalyst
Nov 25	Conference participation	Neutral	+0.3%	Investor conference appearance with management fireside chat and webcast access.
Oct 30	Earnings results	Positive	-1.5%	Q2 FY2026 sales and EPS growth with strong e-Mobility and industrial trends.
Oct 21	Product launch	Positive	+1.8%	Launch of ACS37100 10 MHz TMR current sensor targeting xEVs and clean energy.
Oct 14	Leadership change	Neutral	+0.7%	Appointment of SVP, GM Products with extensive semiconductor leadership background.

Pattern Detected

Product and corporate news have tended to see modest positive moves, while at least one strong earnings report coincided with a short-term pullback, suggesting occasional sell-the-news behavior on financial results.

Recent Company History

Over the last several months, Allegro has combined financial progress with steady strategic news flow. Q2 FY2026 results on Oct 30, 2025 showed higher sales and EPS but the stock fell 1.53%, hinting at some profit-taking around earnings. In contrast, the ACS37100 product launch on Oct 21, 2025 and leadership appointment on Oct 14, 2025 saw modest gains. The new ACS37200 announcement continues this focus on advanced current-sensing solutions for automotive, industrial, and data center markets.

Market Pulse Summary

The stock moved +5.7% in the session following this news. A strong positive reaction aligns with Allegro’s history of constructive responses to product innovations, such as prior current-sensor launches. However, past earnings like Q2 FY2026 saw a -1.53% move despite growth, showing that enthusiasm can fade after financial catalysts. With insider activity showing recent net selling and the stock trading below its 200-day MA at $28.20, investors have historically reassessed rallies once initial excitement cools.

Key Terms

galvanically isolated technical

"the ACS37200, a galvanically isolated current sensor that provides a breakthrough"

Galvanically isolated means two electrical systems are kept physically separate so there is no direct conductive path for electrical current between them. For investors this matters because isolation reduces the chance that a fault, interference, or ground loop in one system will damage the other, improving product reliability, safety and regulatory compliance—similar to how a sealed firewall prevents a house fire from spreading to the next unit, which can lower repair costs and liability risk.

shunt resistors technical

"the heat and power loss generated by traditional shunt resistors has become"

A shunt resistor is a low-value electrical resistor placed in a circuit to safely measure the flow of electric current by creating a small, proportional voltage drop; think of it as a calibrated speed bump that lets instruments read how fast current is moving without disturbing the traffic. Investors care because its accuracy, durability and heat behavior affect product performance, safety and manufacturing cost in electronics, batteries and electric vehicles.

power density technical

"This efficiency gain is a critical enabler for power density."

Power density measures how much energy a device or system can produce or transfer in a given amount of space or volume, often expressed as power per unit area or volume. It helps investors understand how efficiently a technology can deliver energy or performance relative to its size, which can influence decisions about its practicality and potential for scaling up. High power density typically indicates a compact, powerful solution, while lower values suggest larger, less intense options.

heatsinks technical

"can waste up to 5 watts of power as pure heat, requiring costly and space-consuming heatsinks."

A heatsink is a metal device that draws heat away from electronic components and spreads it into the air so the parts stay cool, similar to how a car radiator or a kitchen fan moves heat away. Investors care because heatsinks affect product reliability, performance and manufacturing cost; demand or improvements in cooling can influence sales, margins and supply-chain dynamics for hardware makers.

UL 62368-1 regulatory

"a single, factory-calibrated component certified to UL 62368-1, it replaces"

UL 62368-1 is a safety standard that sets requirements for the design and construction of electronic equipment (like audio, video and IT devices) to prevent hazards such as electric shock, fire or burns. For investors it matters because products that meet this widely recognized certification can be sold in many markets, reduce recall or liability risk, and help a company reach customers faster — like a building passing an inspection before opening to the public.

galvanic basic isolation technical

"Provides 1000 VRMS / 1,414 VDC of certified galvanic basic isolation in a"

Galvanic basic isolation is an electrical safety design that prevents direct current flow between two circuits by using a non-conductive barrier, similar to how a fence separates two yards while still allowing views. For investors, it matters because this form of isolation affects product safety, regulatory approvals, and reliability — deficiencies can lead to recalls, certification delays, or liability, while robust isolation can speed market access and reduce risk.

isolation amplifier technical

"replaces multiple discrete parts—including a shunt resistor, isolation amplifier, and associated"

An isolation amplifier is an electronic device that transfers a measurement or control signal between two circuits while preventing direct electrical connection, protecting equipment and people from shocks and avoiding interference between systems. For investors, its use in medical devices, industrial controls and test equipment affects product safety, regulatory approval, reliability and market demand—think of it as a translator and shock absorber that keeps systems talking safely without shorting each other out.

bill of materials (BOM) financial

"This reduces the bill of materials (BOM), simplifies the supply chain, and removes"

A bill of materials (BOM) is a detailed “recipe” listing every part, raw material and subassembly needed to make a product, including quantities and how pieces fit together. Investors use it to estimate production costs, inventory needs and supply-chain risks—similar to checking ingredients and shopping lists before cooking a big meal—so changes to a BOM can affect profit margins, manufacturing speed and a company’s ability to meet demand.

AI-generated analysis. Not financial advice.

50 µΩ ACS37200 slashes power loss by 90% and shrinks system size by up to 95% in demanding HEV/EV, industrial, and data center applications

MANCHESTER, N.H., Jan. 05, 2026 (GLOBE NEWSWIRE) -- Allegro MicroSystems, Inc. (“Allegro”) (Nasdaq: ALGM), a global leader in power and sensing solutions for motion control and energy-efficient systems, today announced the ACS37200, a galvanically isolated current sensor that provides a breakthrough solution to the efficiency and power density challenges in high-current applications. As engineers design increasingly compact and powerful systems for hybrid and battery electric vehicles (HEV/EVs), industrial automation, AI data centers, and solar inverters, the heat and power loss generated by traditional shunt resistors has become a primary design bottleneck. The ACS37200, with its industry-leading 50 µΩ conductor resistance, removes this obstacle, enabling designers to build smaller, more efficient, and more reliable power systems.

From Wasted Heat to More Power
In a high-current system, every milliohm of resistance matters. A typical 100A design using a 0.5mΩ shunt resistor can waste up to 5 watts of power as pure heat, requiring costly and space-consuming heatsinks. The ACS37200’s ultra-low 50 µΩ resistance reduces that power loss to just 0.5 watts—a 90% reduction. This means less energy is wasted and more power is available to drive the vehicle or run the server, directly improving HEV/EV range and lowering data center operating costs.

A Breakthrough in Power Density
This efficiency gain is a critical enabler for power density. While Allegro’s previous generation of integrated sensors, such as the ACS772, already offered a nearly 7x size reduction over bulky discrete shunt solutions, the new ACS37200, in its compact 100 mm² PSOF package, takes this even further. It is nearly 70% smaller than the ACS772’s CB package, resulting in a total footprint that is 20 times smaller than a traditional shunt solution—a significant 95% reduction in board space. Because the sensor generates minimal heat, designers can eliminate bulky heatsinks, and its integrated architecture removes external isolation components, directly enabling this new level of compactness and higher power density.

“Our customers consistently tell us that power is a major bottleneck. Systems need to monitor, convert and deliver more power than ever before in the same or even smaller form factors,” said Matt Hein, Business Line Director of Current Sensors at Allegro MicroSystems. “By drastically cutting power loss and offering a 95% reduction in footprint, we are giving our customers more design freedom, higher power density, and a faster path to building smaller, more efficient systems for the future of e-Mobility, industrial automation, and clean energy.”

Simplifying Design and Enhancing Safety
Beyond efficiency and density, the fully integrated ACS37200 simplifies the design process. As a single, factory-calibrated component certified to UL 62368-1, it replaces multiple discrete parts—including a shunt resistor, isolation amplifier, and associated passive components. This reduces the bill of materials (BOM), simplifies the supply chain, and removes the need for complex high-voltage isolation design, enhancing system safety and reliability.

ACS37200 Features and Benefits

• Ultra-Low Power Loss: Industry’s lowest conductor resistance of 50 µΩ reduces power loss by 90% compared to a typical 0.5mΩ shunt.
• Unprecedented Power Density: A 95% smaller footprint than discrete shunt solutions delivers more compact and cost-effective end products.
• Robust, Certified Isolation: Provides 1000 VRMS / 1,414 VDC of certified galvanic basic isolation in a single surface-mount package and is certified to UL 62368-1.
• Simplified Design: Replaces multiple discrete components (shunt, isolation amp) with a single factory-calibrated IC in a space-saving 8-pin PSOF package.

Stop wasting power on hot, inefficient shunts. Discover how the ACS37200 can reduce sensing-related power loss by up to 90%. Datasheets and samples are available now at: www.allegromicro.com/acs37200.

About Allegro MicroSystems   
Allegro MicroSystems, Inc. is leveraging more than three decades of expertise in magnetic sensing and power ICs to propel automotive, clean energy and industrial automation forward with solutions that enhance efficiency, performance and sustainability. Allegro’s commitment to quality drives transformation across industries, reinforcing our status as a pioneer in "automotive-grade" technology and a partner in our customers' success. For additional information, visit https://www.allegromicro.com/en/.

Media Contact:    
Andrew MacLellan  
Corporate Communications   
(617) 633-4909   
am@embedded-pr.com  
   
Allegro Contact:    
Ram Sathappan
Vice President of Global Marketing and Applications
rsathappan@allegromicro.com

A photo accompanying this announcement is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/8f2e1432-de04-4b99-90ce-440aa1108802

FAQ

What is the key efficiency claim for Allegro's ACS37200 (ALGM) announced Jan 5, 2026?

Allegro claims the ACS37200 cuts sensing-related power loss by 90% compared with a typical 0.5mΩ shunt, using a 100A example (5W down to 0.5W).

How much board space does the ACS37200 (ALGM) save compared to traditional shunts?

Allegro states the ACS37200 delivers a 95% smaller footprint than traditional discrete shunt solutions.

What isolation rating does Allegro list for the ACS37200 (ALGM)?

The sensor is certified for 1000 VRMS / 1,414 VDC galvanic basic isolation and meets UL 62368-1.

How does the ACS37200 (ALGM) simplify system design and the BOM?

The ACS37200 is a factory-calibrated, fully integrated IC that replaces a shunt resistor and isolation amplifier, reducing component count and BOM.

Which applications does Allegro target for the ACS37200 (ALGM)?

Allegro highlights HEV/EV, industrial automation, AI data centers, and solar inverter applications as target markets.