Texas Instruments REF3425QDBVRQ1

Overview

REF3425QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified, low-drift (6 ppm/°C max), low-power (95 µA max) CMOS voltage reference delivering 2.5 V ±0.05% initial accuracy with ±10 mA output current capability. It features enable-controlled shutdown (3 µA max), 3.8 µV_PP/V low-frequency noise, and operates across −40°C to +125°C for automotive sensor signal conditioning and high-resolution ADC biasing.

For engineers reviewing the REF3425QDBVRQ1 datasheet, REF3425QDBVRQ1 pinout, REF3425QDBVRQ1 application, or REF3425QDBVRQ1 equivalent, key selection criteria include initial accuracy, temperature coefficient, quiescent current in active/shutdown modes, dropout voltage at load, and thermal hysteresis performance in automotive-grade environments.

Technical Context

The REF3425QDBVRQ1 implements a precision bandgap core with buffered force-sense architecture, enabling high-accuracy regulation independent of PCB trace resistance and load-induced IR drop. Its dual-output topology (OUT_F/OUT_S) separates force and sense paths to eliminate errors from output current flow through parasitic resistances.

It integrates digital enable logic with internal current limiting and thermal protection, supporting seamless transition between active mode (72–95 µA) and shutdown mode (≤3 µA). The device achieves 25 ppm/1000 hrs long-term stability and ≤30 ppm thermal hysteresis (Cycle 1, DBV package), critical for battery management and ADAS calibration integrity.

Key Specifications

Pinout & Package

REF3425QDBVRQ1 is packaged in a 6-pin SOT-23 (DBV) with 2.90 mm × 1.60 mm body size, optimized for space-constrained automotive PCBs. Pin functions are validated per TI SBAS901C Rev C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3425QDBVRQ1, REF3425QDGKRQ1 offers improved thermal dissipation but demands layout changes, while MAX6025AESA+ trades automotive qualification and force-sense capability for tighter drift - making REF3425QDBVRQ1 the sole choice for AEC-Q100 Grade 1 systems requiring both accuracy and robustness.

Availability

REF3425QDBVRQ1 is available at Aetrix Electronics and suitable for body control modules, on-board chargers, traction inverters, and battery management systems requiring stable component supply under automotive qualification and long-lifecycle support.

Supply support for REF3425QDBVRQ1 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 automotive-grade precision analog ICs.

REF3425QDBVRQ1 belongs to the REF34-Q1 series of AEC-Q100 qualified voltage references designed specifically for high-accuracy, low-drift, low-power operation in automotive powertrain, chassis, and ADAS subsystems.

FAQ

What is the maximum input voltage for REF3425QDBVRQ1?

The absolute maximum input voltage for REF3425QDBVRQ1 is 13 V, but the recommended operating maximum is 12 V per the datasheet. Exceeding 12 V may increase power dissipation and thermal stress, especially at high ambient temperatures or full load. The device maintains regulation down to VOUT + VDO (100 mV typical), allowing reliable operation from as low as 2.6 V in automotive start-stop conditions.

Does REF3425QDBVRQ1 support force-sense configuration, and why does it matter?

Yes, REF3425QDBVRQ1 supports true force-sense operation via separate OUT_F and OUT_S pins. This architecture eliminates errors caused by voltage drop across PCB traces or connectors between the reference and load. For example, in a BMS monitoring 16-series Li-ion cells, force-sense ensures the ADC sees exactly 2.5 V regardless of 50 mΩ trace resistance at ±10 mA load - preserving measurement integrity.

What is the shutdown current of REF3425QDBVRQ1, and how is it controlled?

REF3425QDBVRQ1 draws ≤3 µA in shutdown mode when the EN pin is pulled low (≤0.5 V). The EN pin is active-high with a logic threshold of ≥1.6 V for activation. During shutdown, the output goes high-impedance, disabling all internal circuitry except minimal biasing - enabling ultra-low power states in always-on vehicle modules like intrusion detection sensors.

How does REF3425QDBVRQ1 perform in terms of long-term stability?

REF3425QDBVRQ1 exhibits 25 ppm drift over 1000 hours at 35°C (DBV package), measured per JEDEC JESD22-A117. This stability enables extended calibration intervals in automotive applications - for instance, in on-board chargers operating continuously, drift remains within 0.00625% of 2.5 V after 42 days, reducing need for field recalibration.

Is REF3425QDBVRQ1 compatible with ceramic output capacitors?

Yes, REF3425QDBVRQ1 is stable with ceramic output capacitors ranging from 0.1 µF to 10 µF, as specified in Section 7.5 of the datasheet. A 10 µF X7R ceramic capacitor is recommended for optimal noise suppression and transient response in ADC reference applications. No series resistance is required, simplifying layout versus older references needing tantalum or electrolytic caps.