Texas Instruments REF4132B25DBVRQ1

Overview

REF4132B25DBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified series voltage reference delivering 2.5 V output with ±0.05% initial accuracy, 30 ppm/°C max temperature coefficient (B grade), and ±10 mA output current capability in a 5-pin SOT-23 package. It serves as a precision analog reference for high-resolution ADCs in ADAS front cameras and traction inverters.

For engineers reviewing the REF4132B25DBVRQ1 datasheet, REF4132B25DBVRQ1 pinout, REF4132B25DBVRQ1 application, or REF4132B25DBVRQ1 equivalent, key selection considerations include dropout voltage (100 mV max at 0 mA), quiescent current (100 µA max), low-frequency noise (15 µV_PP), thermal hysteresis (35 ppm), and enable-controlled shutdown mode.

Technical Context

The REF4132B25DBVRQ1 implements a CMOS-based bandgap core with integrated output buffer and enable logic, supporting active and shutdown modes via the EN pin. Its architecture delivers stable 2.5 V output across −40°C to +125°C with minimal drift and hysteresis.

It features low-dropout operation (50–500 mV over 0–10 mA load), supports capacitive loads from 0.1 µF to 10 µF, and maintains PSRR >60 dB up to 10 kHz. The device uses internal trimming for initial accuracy and includes protection against short-circuit conditions (18 mA limit).

Key Specifications

Pinout & Package

SOT-23-5 package (2.90 mm × 1.60 mm body size), surface-mount, RoHS-compliant, automotive-grade molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4132B25QDBVRQ1 and MAX6025BEUR+T, REF4132B25DBVRQ1 uniquely combines AEC-Q100 Grade 1 qualification, enable control, 30 ppm/°C drift, and 15 µV_PP noise - making it the sole choice for ASIL-B compliant reference design in ADAS and powertrain systems.

Availability

REF4132B25DBVRQ1 is available at Aetrix Electronics and suitable for ADAS front camera modules, traction inverter feedback circuits, and HEV/EV on-board chargers requiring stable component supply across extended automotive lifecycles.

Supply support for REF4132B25DBVRQ1 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 automotive IC design expertise and ISO/TS 16949-certified manufacturing.

The REF4132-Q1 product line was engineered specifically for high-reliability automotive signal conditioning - delivering low-drift, low-power, and AEC-Q100-compliant voltage references for ADAS, powertrain, and electrification systems.

FAQ

What is the maximum allowable input voltage for REF4132B25DBVRQ1?

The absolute maximum input voltage for REF4132B25DBVRQ1 is 6 V, but the recommended operating range is VREF + VDO (2.6 V minimum) to 5.5 V. Exceeding 5.5 V risks permanent damage per the Absolute Maximum Ratings table in the SNAS795A datasheet. At 5.5 V input, REF4132B25DBVRQ1 maintains full specification compliance including 100 µA max quiescent current and 30 ppm/°C tempco.

Does REF4132B25DBVRQ1 support negative reference generation?

REF4132B25DBVRQ1 itself provides only a positive 2.5 V reference output, but it can be used with an external op-amp like OPA735 to generate matched ±2.5 V rails from a single 5 V supply, as shown in Figure 27 of the SNAS795A datasheet. This configuration leverages REF4132B25DBVRQ1's low drift and noise to maintain tight tracking between positive and negative references in split-supply sensor interfaces.

What is the minimum output capacitance required for stability with REF4132B25DBVRQ1?

REF4132B25DBVRQ1 requires a minimum 0.1 µF ceramic capacitor (X5R or X7R) directly at the VREF pin for stability, as specified in Section 7.5 and Layout Guidelines. Using less than 0.1 µF risks oscillation or degraded noise performance. For improved transient response, a parallel 1–10 µF capacitor may be added, though this increases turn-on time beyond the typical 2.5 ms.

How does the enable pin function in REF4132B25DBVRQ1?

The EN pin on REF4132B25DBVRQ1 controls active/shutdown modes: logic high (≥1.6 V) enables the reference output and draws ≤100 µA, while logic low (≤0.5 V) places REF4132B25DBVRQ1 in shutdown with output in high-impedance state and quiescent current reduced to ≤5 µA. The EN pin must never float or sit between 0.5 V and 1.6 V, as this causes unstable current draw and potential startup failure.

Is REF4132B25DBVRQ1 pin-compatible with LM4132-Q1 variants?

Yes, REF4132B25DBVRQ1 is explicitly documented as a pin-to-pin replacement for LM4132-Q1 in the SNAS795A datasheet Description section. Both use identical SOT-23-5 (DBV) packaging and share identical pinout: Pin 1 (N/C), Pin 2 (GND), Pin 3 (EN), Pin 4 (VIN), Pin 5 (VREF). No PCB layout changes are required when upgrading from LM4132B25QDBVRQ1 to REF4132B25DBVRQ1.