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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Diodes Incorporated LM4040C25H5TA

Name: LM4040C25H5TA
Brand: Diodes Incorporated
SKU: LM4040C25H5TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040C25H5TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: 5-TSSOP, SC-70-5, SOT-353

Datasheet:: LM4040C25H5TA.pdf

Description:: IC VREF SHUNT 0.5% SC70-5

Quantity:: RFQ Add To RFQ list

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Inventory:2,242

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Product details

Overview

LM4040C25H5TA from Diodes Incorporated is a precision 2.5V shunt voltage reference in SC70-5 package with ±0.5% initial tolerance at +25°C, 100 ppm/°C max temperature coefficient, and stable operation from 60 µA to 15 mA. It delivers low 45 µV_RMS noise (10 Hz–10 kHz) and supports battery-powered instrumentation requiring high accuracy under varying load and temperature.

For engineers reviewing the LM4040C25H5TA datasheet, LM4040C25H5TA pinout, LM4040C25H5TA application, or LM4040C25H5TA equivalent, key selection criteria include reverse breakdown voltage stability across current range, thermal hysteresis (0.08%), long-term drift (120 ppm), and capacitive-load tolerance without external compensation.

Technical Context

The LM4040C25H5TA operates as a two-terminal bandgap shunt reference, regulating voltage by sinking adjustable current through its cathode-anode path. Its internal architecture maintains tight output voltage control via curvature-corrected bandgap core and optimized die design for low thermal hysteresis.

It functions within -40°C to +125°C ambient, sustaining ±30 mV total voltage variation over full temperature range at 100 µA test current, and exhibits dynamic impedance of 0.9 Ω at 1 mA/120 Hz - enabling stable feedback in precision ADC biasing and DAC reference circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.5 V nominal reverse breakdown voltage at 100 µA, defining system-level analog accuracy baseline
Initial Tolerance	±0.5% at +25°C, limiting worst-case offset error in calibration-critical signal chains
Temp Coefficient	≤100 ppm/°C (max), constraining voltage drift to ≤250 µV/°C over full operating range
Operating Current	60 µA to 15 mA, supporting ultra-low-power sensor nodes and high-current reference buffering
Noise (10Hz–10kHz)	45 µV_RMS, minimizing quantization uncertainty in 16-bit+ data acquisition systems
Dynamic Impedance	0.9 Ω at 1 mA/120 Hz, ensuring minimal load-induced voltage sag during transient current demand
Long-Term Stability	120 ppm (1000 hrs), specifying maximum irreversible drift for metrology-grade applications

Pinout & Package

LM4040C25H5TA uses the SC70-5 surface-mount package (EOL status per datasheet), with pin 1 = Anode, pin 2 = Cathode, pin 3 = NC, pins 4–5 = NC. Pin 2 must remain floating or be connected to pin 1 per layout guidance; pin 3 has no electrical function.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Reference ground return path; connects to system GND or low-impedance return plane
Pin 2	Cathode	Output node where regulated 2.5V appears; requires series resistor for current setting
Pins 3–5	No Connect	Unused terminals; must not be soldered to traces or vias to avoid parasitic coupling

Key Features

Feature	Design Value
No output capacitor required	Stable regulation with ≥1 µF ceramic or tantalum bypass; eliminates BOM cost and board space for external stabilization
Capacitive-load tolerant	Maintains phase margin >45° with up to 10 µF load capacitance, simplifying layout in noisy environments
Extended temperature range	Validated operation from -40°C to +125°C enables use in automotive engine control and industrial PLC modules
Green SOT23/SC70 packaging	Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets IEC 61249-2-21
Low minimum operating current	60 µA typical IR_MIN allows integration into sub-100 µA sleep-mode circuits without dropout

Applications

Battery-Powered Instrumentation

Precision Data Acquisition

Use Scenario: Handheld multimeter with auto-ranging ADC and dual-slope conversion.

IC Role / Device Role / Timing Role: 2.5V reference for 18-bit SAR ADC front-end, providing absolute voltage scaling independent of supply rail.

Use Value: ±0.5% initial tolerance and 100 ppm/°C TC ensure <0.01% full-scale error across 0–40°C handheld operating range.

Use Scenario: Industrial 4–20 mA transmitter with HART modulation and local sensor interface.

IC Role / Device Role / Timing Role: Stable excitation source for RTD bridge and reference for 24-bit delta-sigma ADC.

Use Value: 45 µV_RMS noise prevents degradation of effective resolution below 20 bits in 10 Hz bandwidth systems.

Portable Communications

Notebook Power Management

Use Scenario: LTE modem RF front-end requiring precise LO synthesizer bias and PA detector calibration.

IC Role / Device Role / Timing Role: Reference for DAC-controlled bias currents and envelope detector offset trimming.

Use Value: 120 ppm long-term stability avoids recalibration cycles during 5-year field deployment.

Use Scenario: Embedded controller monitoring CPU core voltage (VDD) and memory rail (VDDQ) in ultrabook platform.

IC Role / Device Role / Timing Role: Secondary reference for analog supervisor IC detecting brown-out conditions.

Use Value: Wide 60 µA–15 mA operating range accommodates both deep-sleep monitoring and active-rail validation modes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM4040C25FTA	SOT23 package (not EOL); identical electrical specs but different footprint and thermal resistance (θ_JA = 380°C/W vs SC70-5's ~420°C/W)	Preferred for new designs requiring production continuity and higher power dissipation margin	Select when board space permits larger SOT23 and long-term supply assurance is critical
TLV431ACDBVR	Adjustable 1.24V reference (2.5V set via external resistors); higher 200 ppm/°C TC and 75 µV_RMS noise	Suitable for cost-sensitive applications where trimmability offsets tolerance and noise penalties	Choose only if design already uses TLV431 family and board layout cannot accommodate fixed-reference optimization

Compared with LM4040C25FTA, the H5 variant trades supply-chain longevity for compact SC70-5 size; versus TLV431ACDBVR, it delivers superior TC and noise performance but lacks adjustability - making it optimal for fixed-voltage, high-stability roles where layout space is constrained.

Availability

LM4040C25H5TA is available at Aetrix Electronics and suitable for battery-powered instrumentation, precision data acquisition, and portable communications equipment requiring stable component supply despite its End-of-Life (EOL) status at Diodes Incorporated.

Supply support for LM4040C25H5TA 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 devices, with emphasis on high-reliability, energy-efficient solutions for industrial and consumer markets.

The LM4040 series belongs to Diodes' precision analog portfolio, engineered specifically for applications demanding micro-power, low-drift voltage references in space-constrained systems.

FAQ

What is the maximum safe reverse current for LM4040C25H5TA?

The absolute maximum continuous reverse current is 20 mA per datasheet Absolute Maximum Ratings. Operation above 15 mA is outside recommended conditions and risks accelerated long-term drift or thermal runaway. For reliable 125°C junction operation, limit current to ≤12 mA with adequate PCB copper area.

Can LM4040C25H5TA drive a 10 kΩ load directly?

No - the LM4040 is a shunt reference and requires an external series current-setting resistor. A 10 kΩ load draws 250 µA at 2.5V, so RS must be sized to supply ≥310 µA (load + 60 µA min reference current) from the supply voltage. Direct connection without RS will cause open-circuit failure.

Why is SC70-5 marked as End of Life while SOT23 remains active?

Diodes Incorporated discontinued SC70-5 variants due to lower manufacturing yield and declining demand versus SOT23. The SOT23 version offers better thermal performance (lower θ_JA) and broader distributor inventory, making it the recommended replacement for new designs despite identical electrical behavior.

How does thermal hysteresis affect calibration in portable test equipment?

With 0.08% thermal hysteresis (≈2 mV at 2.5V), repeated temperature cycling between -20°C and +60°C introduces non-repeatable offset shifts. In handheld calibrators, this mandates single-point warm-up stabilization before measurement to avoid 0.02% reading uncertainty in 4½-digit displays.

LM4040C25H5TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: 5-TSSOP, SC-70-5, SOT-353

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±0.5%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 35µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 68 µA

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70-5

LM4040C25H5TA FAQ

1.How can I place an order for LM4040C25H5TA through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040C25H5TA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LM4040C25H5TA reliable?

The price and inventory of LM4040C25H5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25H5TA is usually 5 days.

3.What payment methods are accepted for LM4040C25H5TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C25H5TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040C25H5TA?

LM4040C25H5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040C25H5TA order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LM4040C25H5TA?

For technical support, including LM4040C25H5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25H5TA requirements.

6.How does Aetrix verify that LM4040C25H5TA is sourced from the original manufacturer or authorized distributors?

All LM4040C25H5TA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM4040C25H5TA meets industry standards.

7.What is the process for return or replacement of LM4040C25H5TA?

All LM4040C25H5TA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25H5TA, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LM4040C25H5TA part is unused and in its original packaging.

Return procedure for LM4040C25H5TA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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