Texas Instruments LM4050BIM3X-2.5

Overview

LM4050BIM3X-2.5 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23 package, delivering a stable 2.5 V reverse breakdown voltage with ±5 mV (±0.2%) initial tolerance at 25°C, 41 μV_rms wideband noise (10 Hz–10 kHz), and 50 ppm/°C max temperature coefficient across −40°C to 85°C. It operates from 60 μA to 15 mA, enabling use in low-power analog front-ends of portable instrumentation and battery-powered data acquisition systems.

For engineers reviewing the LM4050BIM3X-2.5 datasheet, LM4050BIM3X-2.5 pinout, LM4050BIM3X-2.5 application, or LM4050BIM3X-2.5 equivalent, key selection criteria include its no-output-capacitor-required operation, capacitive load tolerance, 0.3 Ω dynamic impedance at 1 mA, thermal hysteresis of 0.7 mV, and industrial-grade temperature range - all critical for high-accuracy, space-constrained voltage referencing.

Technical Context

The LM4050BIM3X-2.5 employs bandgap-based Zener-zap trimmed shunt regulation with curvature-corrected temperature drift compensation, ensuring stable 2.5 V reference output under varying load and temperature conditions. Its design eliminates external stabilization capacitors while maintaining stability with any capacitive load up to 10 nF.

It features fuse-trimmed reverse breakdown voltage during wafer sort, achieving ±0.2% initial accuracy (Grade B) at 25°C and ≤±24 mV total tolerance over −40°C to 85°C. Dynamic impedance remains below 0.3 Ω at 1 mA, supporting fast transient response in precision ADC biasing and sensor excitation circuits.

Key Specifications

Pinout & Package

SOT-23 (DBZ) package, 2.92 mm × 1.30 mm body size, 3-pin surface-mount configuration with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431CDBZR and REF3025AIDBZR, the LM4050BIM3X-2.5 uniquely combines true 2.5 V fixed shunt operation, ultra-low noise, and zero-external-component stability - making it optimal for space-constrained, low-power, high-accuracy analog signal conditioning where topology flexibility is limited.

Availability

LM4050BIM3X-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and energy management applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for LM4050BIM3X-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 leadership in precision analog ICs and voltage references.

The LM4050-N family was designed for high-accuracy, micropower shunt reference applications in space-constrained and battery-operated systems - emphasizing factory-trimmed stability, capacitive-load immunity, and wide operating current range.

FAQ

What is the maximum operating current for LM4050BIM3X-2.5?

The LM4050BIM3X-2.5 supports a maximum operating current of 15 mA, as specified in the Absolute Maximum Ratings table. This allows robust operation under heavy load conditions while maintaining 2.5 V regulation. Exceeding 15 mA risks permanent damage. The device delivers stable performance across its full 60 μA to 15 mA operating range, making LM4050BIM3X-2.5 suitable for both ultra-low-power and moderate-current reference applications.

Does LM4050BIM3X-2.5 require an external capacitor for stability?

No, LM4050BIM3X-2.5 does not require an external output capacitor for stability. Its internal design ensures unconditional stability with any capacitive load, including zero capacitance. This eliminates BOM cost and board area typically needed for compensation networks. The datasheet explicitly states "No Output Capacitor Required" as a key feature, and LM4050BIM3X-2.5 maintains stability even with up to 10 nF of load capacitance - a critical advantage in compact, high-density layouts.

What is the thermal hysteresis specification for LM4050BIM3X-2.5?

The thermal hysteresis of LM4050BIM3X-2.5 is 0.7 mV, measured as the voltage difference at 25°C after cycling between −40°C and +125°C. This low hysteresis value reflects minimal memory effect from temperature excursions, preserving long-term calibration integrity in field-deployed equipment. For LM4050BIM3X-2.5, this parameter directly impacts system-level accuracy retention after environmental stress - especially important in portable test gear and industrial sensors subject to repeated thermal cycling.

Is LM4050BIM3X-2.5 qualified for automotive applications?

No, LM4050BIM3X-2.5 is not automotive-qualified. It belongs to the industrial-grade LM4050-N series, rated for −40°C to +85°C operation. For automotive use, TI offers the LM4050-N-Q1 variant (e.g., LM4050BQIM3X-2.5), which is AEC-Q100 Grade 1 qualified and manufactured on an automotive-grade flow. LM4050BIM3X-2.5 lacks the extended reliability testing, traceability, and qualification documentation required for under-hood or safety-critical automotive systems.

What is the reverse dynamic impedance of LM4050BIM3X-2.5 at 1 mA?

The reverse dynamic impedance of LM4050BIM3X-2.5 is 0.3 Ω, measured at 1 mA DC current and 120 Hz AC signal with 0.1×IR AC amplitude. This low impedance ensures minimal voltage variation under changing load conditions - critical for maintaining ADC reference accuracy during multiplexed sampling or sensor excitation. The 0.3 Ω value is confirmed in Section 6.6 (2.5-V Option) of the SNOS455G datasheet and applies specifically to LM4050BIM3X-2.5 under standard test conditions.