DHAB S/137 , DHABS/137

DHABS/137 Product Details – LEM Original Open-Loop Hall Effect Current Sensor

DHABS/137 Product Overview

The DHABS/137 is an automotive-grade open-loop Hall effect current sensor, originally manufactured by LEM, the world leader in electrical measurement. Belonging to the highly regarded DHAB series, this sensor is specifically designed for high-voltage, low-voltage, and high-power automotive applications. It features a dual-channel wide measurement range of ±75 A and ±1000 A, enabling wide-span current detection within a single compact package. With galvanic isolation, high accuracy, and excellent thermal stability, the DHABS/137 is a premium choice for electric vehicle battery management systems (BMS), hybrid electric vehicles (HEV), and energy storage systems.

Unlike traditional sensors that require separate components for low and high current measurements, the dual-channel redundant design of the DHABS/137 significantly reduces the bill of materials (BOM), simplifies layout, and lowers procurement management complexity.

DHABS/137 Technical Specifications

DHABS/137 Key Advantages & Differentiators

Trusted Original Brand Quality
LEM is a global market leader in electrical sensors, with over 2,500 current and voltage sensor products covering ranges from 0.1A to 20,000A and 10V to 12,000V. LEM serves industries such as industrial automation, railway, new energy, automotive, and battery monitoring. With production centers in Geneva (Switzerland), Copenhagen (Denmark), Machida (Japan), and Beijing (China), LEM offers seamless global support and local technical expertise. Choosing DHABS/137 means choosing reliability, quality, and long-term supply stability.

Wide Dynamic Range – One Sensor for Low & High Currents
The dual-channel design of the DHABS/137 eliminates the need for separate sensors for low and high current measurements:

±75 A for precise control applications

±1000 A for main traction circuits, EV battery pack high-voltage busbars, inrush currents, and short-circuit protection
Both channels are integrated in a single housing, saving valuable PCB space and reducing system integration costs.

Galvanic Isolation for Safety
The sensor provides galvanic isolation between the primary (high-voltage, high-current) circuit and the secondary electronic circuit. This inherently meets functional safety requirements, improves system safety, reduces interference coupling, and simplifies complex isolation circuit design.

Extreme Environmental Robustness
With an operating temperature range of -40℃ to +125℃ and an IP6k9k-rated PBT plastic housing, the DHABS/137 withstands harsh automotive and industrial environments, including vibration, dust, water, and corrosion, ensuring long service life.

Accurate and Stable Measurement Performance
Featuring open-loop Hall effect technology with ±0.5% linearity and a sensitivity of approximately 26.7 mV/A, the sensor delivers uniform and predictable signal output across the 75A to 1000A range. This enables precise current control and overcurrent protection. Additionally, low thermal offset drift and low thermal sensitivity drift ensure consistent accuracy even under extreme temperature variations.

Ratiometric Voltage Output for Easy Integration
The ratiometric voltage output scales with the supply voltage, automatically compensating for supply fluctuations. This makes it ideal for direct connection to general-purpose microcontrollers and ADC acquisition circuits, reducing software/hardware tuning time and lowering development and calibration costs.

Key Safety and Environmental Certifications
Compliant with UL 508 (Industrial Control Equipment) and CSA C22.2 NO.14 standards, as well as lead-free and RoHS requirements. This satisfies critical safety certification needs for end products and supports global green design initiatives, facilitating export to EU and North American markets.

DHABS/137 Target Applications

The DHABS/137 is widely used in the following critical fields:

Why Choose DHABS/137?