Diodes Incorporated LM4040C50H5TA

Overview

LM4040C50H5TA from Diodes Incorporated is a precision 5.0V shunt voltage reference in SC70-5 package, rated for ±0.5% initial tolerance at +25°C, 100 ppm/°C max temperature coefficient, and stable operation from 60 µA to 15 mA reverse current - used as a compact, low-noise reference in portable power monitoring circuits.

For engineers reviewing the LM4040C50H5TA datasheet, LM4040C50H5TA pinout, LM4040C50H5TA application, or LM4040C50H5TA equivalent, key selection criteria include reverse breakdown voltage accuracy across -40°C to +125°C, dynamic impedance under varying load current, thermal hysteresis performance, and compatibility with capacitive loads without external compensation.

Technical Context

The LM4040C50H5TA operates as a two-terminal bandgap-based shunt reference, requiring only an external series resistor to regulate output voltage. Its internal architecture maintains stable reverse breakdown behavior across 60 µA–15 mA operating current, with minimal sensitivity to capacitive loading due to inherent stability design.

It delivers 5.0 V nominal reverse breakdown voltage with ±25 mV (±0.5%) tolerance at +25°C, and supports full industrial temperature range (-40°C to +125°C) while maintaining ≤100 ppm/°C tempco and ≤0.08% thermal hysteresis - enabling use in unregulated supply environments where precision and drift control are critical.

Key Specifications

Pinout & Package

LM4040C50H5TA uses the SC70-5 surface-mount package (end-of-life per manufacturer), with pin 1 = Anode, pin 2 = Cathode, pins 3–5 = No Connect (N/C). Pin 2 must remain floating or be tied to pin 1 per layout guidance; pin 3 has no electrical function and must not be connected to ground or supply.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040C50FTA, this SC70-5 variant offers identical precision but faces EOL sourcing risk; versus TLV431ACDBVR, it provides simpler fixed-voltage implementation and superior low-current operation below 100 µA, at the cost of adjustability and tighter tempco.

Availability

LM4040C50H5TA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable communications devices, and industrial sensor transmitters requiring stable component supply despite its End-of-Life status.

Supply support for LM4040C50H5TA 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs, with emphasis on power management, signal integrity, and precision analog solutions.

The LM4040 family was designed to deliver micro-power, high-accuracy shunt references for space-constrained, battery-sensitive applications - prioritizing low quiescent current, wide operating range, and robust capacitive-load stability.

FAQ

Is LM4040C50H5TA still in active production?

No - Diodes Incorporated has designated all H5 (SC70-5) variants of the LM4040, including LM4040C50H5TA, as End-of-Life per the official ordering information table. Active production continues only in SOT23 (FTA suffix) packages. Aetrix Electronics maintains limited legacy stock with full traceability and supports transition planning to LM4040C50FTA.

Can LM4040C50H5TA replace LM4040C50FTA in existing PCB layouts?

No - SC70-5 (H5) and SOT23 (FTA) packages have incompatible footprints, pin counts, and terminal assignments. SC70-5 uses 5 pins (Anode, Cathode, 3×N/C), while SOT23 uses 3 pins (Anode, Cathode, N/C). Direct replacement requires PCB redesign; Aetrix recommends using LM4040C50FTA with updated land pattern per Diodes' package outline documentation.

What is the maximum capacitive load the LM4040C50H5TA can drive without oscillation?

The LM4040C50H5TA remains stable with up to 1.0 µF tantalum capacitance directly across its cathode and anode terminals, as verified in typical characteristics plots and application notes. This eliminates need for series resistance or isolation components - unlike many bandgap references that require ≥10 Ω damping for >10 nF loads.

Does LM4040C50H5TA support operation below 60 µA reverse current?

No - the datasheet specifies 60 µA as the minimum guaranteed operating current (IR_MIN) for LM4040C grade at +25°C. Below this, reverse breakdown voltage deviates beyond ±0.5% tolerance, and regulation becomes unreliable. For sub-60 µA applications, consider LM4040B-grade variants or alternative micropower references like REF3050.