LM3812M-1.0 Guide: Sourcing, specs & EOL alternatives

The LM3812M-1.0 is a precision high-side current gauge IC featuring an integrated sense element and a Delta-Sigma ADC that provides a Pulse Width Modulated (PWM) output. While officially classified as Obsolete (EOL) by Texas Instruments, it remains a popular choice for engineers seeking low-overhead current sensing in 5V systems without the need for external shunts or complex digital communication protocols. Digikey Farnell

Technical Summary

* Key Specs: It monitors current in a ±1A range with ±2% accuracy at room temperature. Its ultra-low insertion loss (typically 0.004Ω) and wide supply voltage range (2.0V to 5.25V) make it ideal for battery-operated devices. Alibaba Digikey

* Output Logic: The PWM duty cycle directly represents current direction and magnitude, with a 50% duty cycle indicating zero current. Farnell

* Applications: Historically used in telecom DC-DC monitoring, smart fuses, and Li-ion battery management. Alibaba Radioradar

Market Trends & Sourcing Insights

* Availability: Despite its EOL status, significant inventory is still held by B2B suppliers, particularly in Shenzhen. Current market prices range from $0.39 to $0.99 depending on order volume. Alibaba Alibaba

* Shift to Digital: Modern industry trends are moving toward I²C-based sensors like the INA226 or Hall-effect sensors like the ACS724 for better resolution and isolation. However, the LM3812 remains relevant for legacy maintenance and cost-optimized analog designs. Eetimes Allegromicro

* Supply Risk: As stock depletes, lead times are expected to increase. For new high-volume designs, migrating to active alternatives is strongly recommended. Farnell

Lm3812m 1.0

Overview

Technical Summary

Market Trends & Sourcing Insights

Lm3812m 1.0 Ic Current Gauge Sop 8

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Sources & References