BD14221G-CTR

Overview

The BD14221G-CTR is a single-channel automotive current sense amplifier from Rohm Semiconductor, designed for high-precision shunt-based current monitoring. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and features a wide common-mode voltage range of -14 V to +40 V. The device provides an analog voltage output with a fixed gain of 50 V/V. Key electrical specifications include a maximum input offset voltage of 500 µV, a typical input bias current of 1 µA, and a supply current of 240 µA. It offers a bandwidth of 40 kHz and supports push-pull outputs. The component is housed in a compact 6-SSOP package and is qualified to AEC-Q100 Grade 1 standards for operation between -40°C and +125°C.

Feature Summary

• High precision achieved through internally matched gain resistors that minimize gain error and offset voltage variations across temperature changes.
• Wide common-mode voltage tolerance supporting negative inputs down to -14 V and positive inputs up to +40 V, enabling reverse polarity protection.
• Low power consumption with a typical operating current of 240 µA, suitable for battery-powered and energy-efficient automotive systems.
• Automotive-grade reliability certified under AEC-Q100 standards, ensuring performance stability in harsh thermal environments.

Applications

• Current feedback and overcurrent detection in 12V vehicle power networks
• Battery level monitoring and management in automotive systems
• Protection circuits within body control modules and driver control units

Procurement Notes

Verify the specific suffix G-CTR corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the AEC-Q100 Grade 1 qualification aligns with your system's environmental stress requirements. Ensure the SSOP6 footprint matches your PCB layout constraints. Cross-reference the datasheet revision date to confirm compatibility with your design specifications before finalizing procurement orders.

Selection Notes

Select this component when a fixed 50 V/V gain is appropriate for the target current range and shunt resistor value. Consider the -14 V to +40 V common-mode range if the sensing point may experience transient negative voltages or reverse connections. The low 1 µA input bias current makes it suitable for applications requiring minimal voltage drop across the shunt resistor. Verify that the 40 kHz bandwidth meets the dynamic response needs of the control loop.

Part Context

This part belongs to the BD1422xG-C series of high-precision automotive current sense amplifiers. The series includes variants with different gains (25 V/V, 50 V/V, 100 V/V) to accommodate various sensing requirements. The BD14221G-CTR specifically denotes the 50 V/V gain version in the SSOP6 package. It complements other series like the BD1423xFVJ-C, which supports higher voltages up to 80 V for 48 V systems.

Replacement Considerations

Direct substitutes within the same family include BD14220G-CTR (25 V/V gain) and BD14222G-CTR (100 V/V gain). These parts share identical pinouts, packages, and electrical characteristics except for the internal gain setting. Ensure the application circuit can tolerate the change in output voltage scaling if switching between these gain variants.