Analog Devices Inc./Maxim Integrated LM4050CIM3-5.0+

Overview

LM4050CIM3-5.0+ from Maxim Integrated is a precision 5.000V shunt voltage reference in SC70-3 package, featuring ±0.5% initial accuracy, ±15ppm/°C temperature coefficient over –40°C to +125°C, 60µA–15mA operating current range, and 80µVRMS wideband noise (10Hz–10kHz). It serves as a stable voltage reference in portable battery-powered systems requiring micropower operation and space-constrained PCB layouts.

For engineers reviewing the LM4050CIM3-5.0+ datasheet, LM4050CIM3-5.0+ pinout, LM4050CIM3-5.0+ application, or LM4050CIM3-5.0+ equivalent, key selection criteria include guaranteed reverse breakdown voltage tolerance across temperature, no-output-capacitor stability, low dynamic impedance (≤1.1Ω), and compatibility with capacitive loads in high-precision ADC/DAC biasing, sensor excitation, and portable power monitoring circuits.

Technical Context

The LM4050CIM3-5.0+ implements a bandgap-based two-terminal shunt architecture, functioning like an ideal Zener diode with fixed 5.000V reverse breakdown voltage when biased with 60µA–15mA cathode-to-anode current. Its internal BiCMOS process enables laser-trimmed resistor matching for tight initial accuracy and low thermal drift.

It operates without external stabilization capacitors and maintains regulation under any output capacitance, while tolerating forward currents up to 10mA (clamping to ~0.7V below ground). The device guarantees performance over –40°C to +125°C with 120ppm long-term stability after 1000 hours.

Key Specifications

Pinout & Package

LM4050CIM3-5.0+ uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23, optimized for space-critical portable designs. Pin 3 is NC and must be left floating or tied to Pin 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431ACDBVR and ADR3450ARJZ-R7, LM4050CIM3-5.0+ delivers optimal balance of SC70 size, 5.000V factory-trimmed accuracy, and guaranteed ±15ppm/°C performance-making it the preferred choice for cost-sensitive, space-constrained industrial and portable systems where fixed 5V reference suffices.

Availability

LM4050CIM3-5.0+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial process transmitters, and automotive cabin controllers requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for LM4050CIM3-5.0+ 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

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications, emphasizing low-power, high-accuracy, and small-footprint solutions.

The LM4050/LM4051 product line delivers micropower shunt voltage references targeting space-constrained, battery-operated, and wide-temperature industrial systems where traditional three-terminal references are impractical.

FAQ

What is the guaranteed operating temperature range for LM4050CIM3-5.0+?

The LM4050CIM3-5.0+ is fully specified and guaranteed over –40°C to +125°C ambient temperature. All electrical parameters-including reverse breakdown voltage, temperature coefficient, and dynamic impedance-are tested and warranted across this full industrial temperature range, making LM4050CIM3-5.0+ suitable for under-hood automotive and outdoor industrial deployments without derating.

Does LM4050CIM3-5.0+ require an external output capacitor for stability?

No, LM4050CIM3-5.0+ does not require an external output capacitor. Its internal design ensures unconditional stability with any capacitive load, including direct connection to ADC reference inputs or large ceramic bypass caps. This eliminates capacitor-related BOM cost, layout sensitivity, and aging effects-key advantages over many competing shunt references.

What is the minimum shunt current needed for LM4050CIM3-5.0+ to maintain regulation?

The LM4050CIM3-5.0+ requires a minimum shunt current of 60µA to maintain regulation at 5.000V. Below this threshold, output voltage deviates significantly; therefore, external series resistor (RS) must be sized to guarantee ≥60µA shunt current even at minimum supply voltage and maximum load current, per the equation: RS < [VS(MIN) − 5.0V] / [60µA + ILOAD(MAX)].

How does the pin configuration of LM4050CIM3-5.0+ differ from standard three-terminal references?

LM4050CIM3-5.0+ uses a two-terminal shunt topology with three physical pins: Pin 1 (+) is the anode (ground side), Pin 2 (−) is the cathode (5V output), and Pin 3 is NC (no connection), which must be left floating or tied to Pin 2. Unlike three-terminal series references, LM4050CIM3-5.0+ regulates by sinking current through its cathode, eliminating the need for a separate input pin.

What is the long-term stability specification for LM4050CIM3-5.0+?

The LM4050CIM3-5.0+ exhibits 120ppm (0.012%) reverse breakdown voltage shift after 1000 hours of operation at +125°C. This long-term stability metric reflects parametric drift under accelerated stress conditions and supports extended calibration intervals in field-deployed equipment such as industrial transmitters and medical monitors where recalibration logistics are costly.