Texas Instruments REF102AM

Overview

REF102AM from Texas Instruments is a precision 10V voltage reference IC designed for high-accuracy analog systems. It delivers ±2.5mV initial accuracy, 2.5ppm/°C max temperature drift over –25°C to +85°C, and 5ppm/1000hr long-term stability - enabling use as a primary reference in 16-bit+ data converters and calibrated test equipment.

For engineers reviewing the REF102AM datasheet, REF102AM pinout, REF102AM application, or REF102AM equivalent, key selection criteria include its laser-trimmed buried zener architecture, SO-8 package compatibility with low-noise PCB layouts, external trim capability (±3% range), and proven performance in metrology-grade instrumentation where thermal drift and time-based drift are critical.

Technical Context

The REF102AM uses a compensated buried zener diode (DZ1) biased via internal resistor network R4, combined with a precision op amp (A1) and laser-trimmed resistors (R1–R3) to generate a stable 10V output without heater-based stabilization. Its drift specification follows the box method across –25°C to +85°C, with worst-case vertical deviation bounded at ±2.75mV.

It features a dedicated Noise Reduction pin (Pin 5) that forms a 22Hz low-pass filter with internal R6 (7kΩ) when a 1µF capacitor is connected to ground - reducing broadband noise from ~800µVPP to <200µVPP. Output current capability is asymmetric: +10mA source / –5mA sink, supporting both active and passive load configurations.

Key Specifications

Pinout & Package

REF102AM is housed in an SOIC-8 (D) package per JEDEC MS-012 AA, 1.75mm max height, with 1.27mm pitch and gull-wing leads. Pin 1 identifier is located in upper-left corner adjacent to beveled edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1021ACN8-10 and ADR1001ARMZ, REF102AM delivers optimal balance of ultra-low drift, low power (1.4mA), fast warm-up (<15µs to 0.1%), and cost-effective SO-8 packaging - making it the preferred choice for production-grade test equipment and embedded calibration subsystems.

Availability

REF102AM is available at Aetrix Electronics and suitable for high-accuracy data acquisition, digital multimeter reference, and precision current source applications requiring stable component supply across extended product lifecycles.

Supply support for REF102AM 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 founded in 1930, specializing in analog and embedded processing technologies with broad industrial, automotive, and instrumentation portfolios.

The REF102AM belongs to TI's precision voltage reference product line, engineered specifically for metrology-grade instrumentation, automated test equipment, and high-resolution data converters where long-term stability and low thermal drift are non-negotiable.

FAQ

What is the maximum capacitive load the REF102AM can drive while maintaining stability?

The REF102AM supports up to 1000pF of capacitive load on its VOUT pin (Pin 6). Exceeding this value may cause phase margin degradation and oscillation, especially when used with low-ESR ceramic capacitors. For loads >1000pF, TI recommends adding a series isolation resistor (e.g., 10Ω) between REF102AM and the capacitor, or using an external buffer amplifier. This limit is specified in the Electrical Characteristics table of the REF102AM datasheet under "Capacitive Load, max".

Does the REF102AM require external components for basic operation?

Yes - the REF102AM requires a minimum 1µF tantalum bypass capacitor between V+ (Pin 4) and Common (Pin 2), placed as close as possible to the device. The Noise Reduction pin (Pin 1) may be left floating for standard operation, or connected to ground via a 1µF capacitor to reduce high-frequency noise. No external components are needed for the Trim pin (Pin 5) unless voltage adjustment is required. These requirements are documented in Figure 2 ("Basic Circuit Connection") of the REF102AM datasheet.

How does trimming the output voltage affect the REF102AM's temperature drift?

Trimming the REF102AM output voltage via Pin 5 increases temperature drift by approximately 0.008ppm/°C per mV of adjustment. For example, a ±300mV trim (±3%) adds up to ±2.4ppm/°C to the base 2.5ppm/°C drift specification. This effect arises from TCR mismatch between the external trim network and internal laser-trimmed resistors. Full details are provided in the "Installation and Operating Instructions" section of the REF102AM datasheet.

Can the REF102AM be used in a negative reference configuration?

Yes - the REF102AM can generate a precision –10V reference when paired with an OPA227 op amp in an inverting configuration, as shown in Figure 6b of the REF102AM datasheet. In this setup, REF102AM provides the +10V reference to the op amp's non-inverting input, and the op amp's output delivers –10V with matched accuracy and drift. The circuit requires careful layout to preserve common-mode rejection and avoid ground loop errors.

What is the warm-up time specification for the REF102AM?

The REF102AM achieves 0.1% output accuracy within 15µs after power application when the Noise Reduction pin (Pin 1) is left floating, as measured in the "Power Turn-On Response" typical characteristic (Figure 5). This fast settling is enabled by its heaterless buried zener architecture. With a 1µF noise reduction capacitor installed, warm-up time increases slightly due to RC filtering, but remains well under 10ms - significantly faster than oven-controlled alternatives like the ADR1001.