Texas Instruments LM4132CMF-3.3/NOPB

Overview

LM4132CMF-3.3/NOPB from Texas Instruments is a precision low-dropout (LDO) series voltage reference IC delivering a stable 3.3 V output with 0.2% initial accuracy, 10 ppm/°C temperature coefficient (0°C to 85°C), and 60 µA supply current. It features an enable pin for 3 µA shutdown mode, supports up to 20 mA load current, and operates from VIN = VREF + 400 mV to 5.5 V - ideal for high-accuracy ADC/DAC biasing in portable instrumentation.

For engineers reviewing the LM4132CMF-3.3/NOPB datasheet, LM4132CMF-3.3/NOPB pinout, LM4132CMF-3.3/NOPB application, or LM4132CMF-3.3/NOPB equivalent, key selection criteria include dropout voltage ≤400 mV at 10 mA, thermal hysteresis ≤75 ppm, long-term stability ≤50 ppm over 1000 hrs, and compatibility with low-ESR ceramic capacitors without requiring output buffering.

Technical Context

The LM4132CMF-3.3/NOPB implements a CMOS band-gap architecture with EEPROM-based curvature, tempco, and accuracy correction - enabling package-level programming to compensate for assembly-induced shifts. This eliminates laser trimming while matching bipolar reference performance.

It operates as a series reference with active enable control, delivering regulated 3.3 V output without mandatory output capacitance. Its 400 mV dropout at 10 mA and 20 mA max load support battery-powered systems where quiescent current and input headroom are critical constraints.

Key Specifications

Pinout & Package

SOT-23 (DBV) 5-pin plastic package, 2.90 mm × 1.60 mm body size, with exposed pad for thermal enhancement (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with REF3333AIDBVR and ADR3433ARJZ-R7, LM4132CMF-3.3/NOPB uniquely delivers 20 mA output drive at 60 µA IQ with grade-C accuracy - making it optimal for space-constrained industrial modules needing direct reference distribution without buffering.

Availability

LM4132CMF-3.3/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial PLC analog input modules, medical patient monitor front-ends, and automotive BMS applications requiring stable component supply with guaranteed long-term availability.

Supply support for LM4132CMF-3.3/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.

The LM4132 family was designed to deliver laser-trimmed bipolar reference performance using cost-effective CMOS + EEPROM trimming - targeting high-accuracy, low-power, and space-constrained applications in instrumentation, test equipment, and automotive systems.

FAQ

What is the maximum load current supported by the LM4132CMF-3.3/NOPB?

The LM4132CMF-3.3/NOPB supports up to 20 mA of continuous output current while maintaining regulation and specified accuracy. This is confirmed in Section 6.3 (Recommended Operating Conditions) and Table 6.9 of the official TI datasheet SNVS372G. Exceeding 20 mA may cause output voltage deviation beyond the 0.2% initial accuracy spec and increased dropout voltage. For loads above 20 mA, an external buffer amplifier is required.

Does the LM4132CMF-3.3/NOPB require an output capacitor for stability?

No, the LM4132CMF-3.3/NOPB is internally compensated and stable with no output capacitor required - a key differentiator from many LDO references. The datasheet explicitly states "COUT is optional" and confirms stability with low-ESR ceramic capacitors if used. Only CIN (input capacitor) is mandatory. This simplifies layout and reduces BOM count, especially in space-constrained designs where the LM4132CMF-3.3/NOPB is deployed.

What is the dropout voltage specification for the LM4132CMF-3.3/NOPB at 10 mA load?

The dropout voltage for the LM4132CMF-3.3/NOPB is 175 mV (typical) and 400 mV (maximum) at 10 mA load and –40°C to +125°C junction temperature. This value is specified in Table 6.9 (Electrical Characteristics LM4132-3.3) of the TI datasheet SNVS372G. It defines the minimum VIN–VREF differential needed to sustain regulation - meaning VIN must be ≥3.475 V (3.3 V + 175 mV) for typical operation at 10 mA.

How does the enable pin (EN) function on the LM4132CMF-3.3/NOPB?

The EN pin on the LM4132CMF-3.3/NOPB is an active-high digital control input. When pulled to ≥65% of VIN, the device enables its 3.3 V output; when pulled to ≤35% of VIN, it enters shutdown mode drawing only 3 µA (typ). This behavior is defined in Table 6.9 under VIL/VIH specifications and enables precise power sequencing in multi-rail systems using the LM4132CMF-3.3/NOPB as a controlled reference source.

Is the LM4132CMF-3.3/NOPB qualified for automotive applications?

The LM4132CMF-3.3/NOPB itself is not AEC-Q100 qualified; it is the commercial-grade variant. However, the pin-compatible LM4132-3.3-Q1 (e.g., LM4132CQMF-3.3/NOPB) is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient) and shares identical electrical specs except for extended temperature validation and enhanced ESD robustness. For automotive BMS or infotainment applications, the Q1 variant must be selected instead of LM4132CMF-3.3/NOPB.