Texas Instruments LM4132CMF-2.5

Overview

LM4132CMF-2.5 from Texas Instruments is a precision low-dropout (LDO) series voltage reference IC delivering a stable 2.5 V output with ±0.2% initial accuracy (C grade), 10 ppm/°C temperature coefficient (0°C to 85°C), and 60 µA quiescent current. It operates from VIN = VREF + 400 mV to 5.5 V, supports up to 20 mA load, and features an enable pin for 3 µA shutdown-ideal for high-accuracy ADC/DAC biasing in portable instrumentation.

For engineers reviewing the LM4132CMF-2.5 datasheet, LM4132CMF-2.5 pinout, LM4132CMF-2.5 application, or LM4132CMF-2.5 equivalent, key selection criteria include dropout voltage at 10 mA (175 mV), 0.1–10 Hz noise (240 µV_PP), thermal hysteresis (75 ppm), long-term stability (50 ppm over 1000 hrs), and SOT-23-5 package compatibility with low-ESR ceramic capacitors.

Technical Context

The LM4132CMF-2.5 uses EEPROM-trimmed CMOS band-gap architecture to correct curvature, tempco, and initial accuracy at package level-overcoming assembly-induced shifts that limit laser-trimmed bipolar references. Its internal LDO regulator eliminates need for output buffer or mandatory C_OUT, unlike shunt references.

It implements a logic-level enable input (VIH = 65% VIN, VIL = 35% VIN) to control 3 µA shutdown mode, and achieves low line regulation (50 ppm/V) and load regulation (25 ppm/mA) across –40°C to +125°C ambient, supporting automotive-grade operation per AEC-Q100 Grade 1.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, with exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3025AIDBZR and ADR3425ARJZ-R7, the LM4132CMF-2.5 uniquely combines enable-driven ultra-low-power shutdown (3 µA), 20 mA output drive, and EEPROM-trimmed tempco correction-making it optimal for space-constrained, battery-operated systems requiring both precision and dynamic power control.

Availability

LM4132CMF-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, and industrial process controllers requiring stable component supply with guaranteed long-term availability and consistent parametric performance across production lots.

Supply support for LM4132CMF-2.5 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision analog design and automotive-grade qualification.

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

FAQ

What is the maximum load current supported by the LM4132CMF-2.5?

The LM4132CMF-2.5 delivers up to 20 mA of output current while maintaining specified accuracy and regulation. This capability allows direct driving of ADC reference inputs, op-amp bias networks, or small DACs without external buffers-reducing bill-of-materials count and board area in compact designs.

Does the LM4132CMF-2.5 require an output capacitor for stability?

No, the LM4132CMF-2.5 is internally compensated and stable with no output capacitor required. However, adding a 1–10 nF ceramic capacitor at the VREF pin improves high-frequency PSRR and transient response. Input capacitor (C_IN) is mandatory-TI recommends ≥1 µF low-ESR ceramic at VIN.

What does the 'C' in LM4132CMF-2.5 indicate?

The 'C' denotes the accuracy grade: LM4132CMF-2.5 is rated for ±0.2% initial output voltage accuracy at 25°C. Other grades include A (±0.05%), B (±0.1%), D (±0.4%), and E (±0.5%). All grades share identical pinout, package, and functional specifications except accuracy and tempco limits.

Can the LM4132CMF-2.5 operate from a 3.3 V supply?

Yes-the LM4132CMF-2.5 supports input voltages from (VREF + 400 mV) = 2.9 V up to 5.5 V. At 3.3 V input, dropout margin is 400 mV, well within specification. Operation at minimum VIN ensures robustness during brown-out conditions in battery-powered systems.

Is the LM4132CMF-2.5 qualified for automotive applications?

Yes-the LM4132CMF-2.5 is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), with HBM ESD rating of ±2 kV. While the standard LM4132 series meets automotive requirements, the LM4132-Q1 variant offers additional automotive-specific testing and documentation-both share identical electrical specs for LM4132CMF-2.5 and LM4132CQMF-2.5.