Texas Instruments LM4132BMF-3.3

Overview

LM4132BMF-3.3 from Texas Instruments is a precision low-dropout (LDO) series voltage reference IC delivering a stable 3.3 V output with 0.1% initial accuracy (B grade), 10 ppm/°C temperature coefficient (0°C to 85°C), 60 µA supply current, and 20 mA output drive capability. It operates from VIN = VREF + 400 mV up to 5.5 V and features an enable pin for 3 µA shutdown mode - ideal for battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the LM4132BMF-3.3 datasheet, LM4132BMF-3.3 pinout, LM4132BMF-3.3 application, or LM4132BMF-3.3 equivalent, key selection criteria include output accuracy over temperature, dropout voltage at 10 mA load, line/load regulation in ppm/V and ppm/mA, long-term stability (50 ppm over 1000 hrs), and compatibility with low-ESR ceramic capacitors without requiring an output buffer.

Technical Context

The LM4132BMF-3.3 uses EEPROM-trimmed CMOS band-gap architecture to achieve laser-trimmed bipolar-level precision at lower cost. Its curvature, tempco, and accuracy are corrected at package level to overcome assembly-induced shifts - a critical advantage over traditional laser-trimmed references.

Unlike shunt references, it draws only 60 µA quiescent current and delivers up to 20 mA without external buffering. The enable pin supports active-high logic control (VIH ≥ 65% VIN), and the device remains stable with no output capacitor required - simplifying layout in space-constrained SOT-23 designs.

Key Specifications

Pinout & Package

SOT-23 (DBV) 5-pin plastic package, 2.90 mm × 1.60 mm body size, with exposed pad 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, the LM4132BMF-3.3 uniquely balances 20 mA drive, 0.1% B-grade accuracy, 10 ppm/°C tempco, and 3 µA shutdown - making it optimal for portable, high-precision, medium-current applications where all three attributes are simultaneously required.

Availability

LM4132BMF-3.3 is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor interfaces, and industrial process controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LM4132BMF-3.3 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 and embedded processing technologies, with decades of expertise in precision analog ICs and automotive-qualified components.

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

FAQ

What is the maximum input voltage for the LM4132BMF-3.3?

The LM4132BMF-3.3 supports a maximum input voltage of 5.5 V, as specified in the Recommended Operating Conditions table. Operation above this voltage risks permanent damage. The minimum input is VREF + 400 mV (i.e., ≥3.7 V), ensuring regulation across the full 20 mA load range.

Does the LM4132BMF-3.3 require an output capacitor for stability?

No, the LM4132BMF-3.3 is internally compensated and stable with no output capacitor required - a key differentiator from many LDO references. Only a 1 µF ceramic input capacitor (CIN) is mandatory; COUT is optional and not needed for basic stability.

What does the 'B' in LM4132BMF-3.3 indicate?

The 'B' denotes the initial accuracy grade: ±0.1% at 25°C. The LM4132 family offers grades A (±0.05%), B (±0.1%), C (±0.2%), D (±0.4%), and E (±0.5%). All grades share identical pinout, package, and functional behavior - only accuracy and tempco specs differ.

Can the LM4132BMF-3.3 be used in automotive applications?

The LM4132BMF-3.3 itself is not AEC-Q100 qualified; however, the pin-compatible LM4132BQDBVR-3.3 (Q1 variant) is certified for Automotive Grade 1 (–40°C to +125°C). For non-automotive industrial use, LM4132BMF-3.3 meets full spec across –40°C to +125°C but lacks formal automotive qualification documentation.

How does the enable pin function on the LM4132BMF-3.3?

The EN pin is active-high: applying ≥65% of VIN turns the device on; ≤35% of VIN places it in 3 µA shutdown mode. The pin has no internal pull-up/down, so external logic or resistor divider must define its state - critical for predictable power sequencing in battery systems.