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

Diodes Incorporated LM4040C30H5TA

Name: LM4040C30H5TA
Brand: Diodes Incorporated
SKU: LM4040C30H5TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040C30H5TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: LM4040C30H5TA.pdf

Description:: IC VREF SHUNT 0.5% SC70-5

Quantity:: RFQ Add To RFQ list

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Inventory:4,401

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Product details

Overview

LM4040C30H5TA from Diodes Incorporated is a precision 3.0V 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 reverse current - used for accurate voltage setting in portable power rails and ADC/DAC biasing.

For engineers reviewing the LM4040C30H5TA datasheet, LM4040C30H5TA pinout, LM4040C30H5TA application, or LM4040C30H5TA equivalent, key selection criteria include reverse breakdown voltage accuracy, low thermal drift, capacitive load stability, and compatibility with space-constrained battery-powered systems.

Technical Context

The LM4040C30H5TA operates as a two-terminal bandgap shunt reference, regulating voltage by sinking variable current through its cathode-anode path. Its internal architecture maintains tight output voltage control without requiring an external output capacitor, even under varying load or supply conditions.

It delivers 3.0V nominal reverse breakdown voltage with ±0.5% tolerance at +25°C, supports operation from −40°C to +125°C ambient, and exhibits ≤100 ppm/°C temperature coefficient across full temperature range - enabling reliable performance in industrial and portable environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.0 V nominal reverse breakdown voltage - sets precise bias point for analog signal chains and power monitoring circuits.
Initial Tolerance	±0.5% at +25°C - ensures voltage accuracy without post-manufacturing calibration in cost-sensitive designs.
Temp Coefficient	≤100 ppm/°C (max) - limits voltage drift to ±0.036 V over −40°C to +125°C, critical for high-resolution data acquisition.
Operating Current	60 µA to 15 mA reverse current range - supports ultra-low-power sensor nodes and higher-current reference buffering.
Noise (10Hz–10kHz)	35 µV_RMS - minimizes added noise in precision ADC references and low-noise amplifier bias networks.
Dynamic Impedance	0.9 Ω at 1 mA - provides low AC impedance for stable regulation under dynamic load transients.
Long-Term Stability	120 ppm (1000 hrs) - ensures minimal voltage shift over time in sealed instrumentation and medical devices.

Pinout & Package

LM4040C30H5TA uses the SC70-5 surface-mount package (end-of-life per Diodes Inc.), with pin 1 = Anode, pin 2 = Cathode, pin 3 = NC, pin 4 = NC, pin 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 node - connects to system GND or low-impedance return path for stable shunt operation.
Pin 2	Cathode	Output voltage node - supplies regulated 3.0V to load; requires series resistor (R_S) for current limiting.
Pins 3–5	No Connect	Unused terminals - must not be soldered to PCB traces or vias to avoid parasitic coupling or mechanical stress.

Key Features

Feature	Design Value
No output capacitor required	Stable regulation with >1 µF capacitive load - eliminates BOM cost and board area for external stabilization.
Low operating current	60 µA minimum cathode current - enables use in coin-cell-powered IoT sensors and always-on wake-up circuits.
Wide temperature range	−40°C to +125°C operation - supports deployment in automotive engine compartments and industrial motor drives.
Low noise output	35 µV_RMS (10 Hz–10 kHz) - preserves SNR in 16-bit+ data converters and precision op-amp feedback networks.
Lead-free & RoHS compliant	Fully green molding compound, <900 ppm Br/Cl, <1000 ppm Sb - meets global environmental compliance mandates.

Applications

Battery-Powered Equipment

Precision Power Supplies

Use Scenario: Coin-cell or Li-ion powered handheld multimeters and gas detectors requiring stable reference over battery discharge.

IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 3.0V reference for ADC conversion and sensor excitation.

Use Value: Maintains ±0.5% accuracy across 2.5V–3.6V input range and −20°C to +60°C ambient, eliminating recalibration.

Use Scenario: Programmable bench power supply with digital voltage control and analog feedback loop.

IC Role / Device Role / Timing Role: Precision 3.0V reference for DAC output scaling and error amplifier reference input.

Use Value: Enables 0.1% output voltage resolution and <10 ppm/°C system-level drift via low-TC, low-noise reference.

Portable Instrumentation

Data Acquisition Systems

Use Scenario: Handheld oscilloscope front-end with rail-to-rail input amplifiers and 12-bit SAR ADC.

IC Role / Device Role / Timing Role: Reference source for ADC internal reference buffer and analog front-end gain calibration.

Use Value: Delivers 35 µV_RMS noise floor and <0.05% linearity error contribution over full temperature range.

Use Scenario: 16-channel industrial DAQ module measuring thermocouples and strain gauges in factory automation.

IC Role / Device Role / Timing Role: Shared 3.0V reference for multiplexed ADC inputs and isolated analog signal conditioning.

Use Value: Ensures channel-to-channel matching <0.01% and long-term stability <200 ppm over 5-year service life.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM4040C30FTA	SOT23-3 package (active), same 3.0V/±0.5%/100 ppm/°C specs, but pin 3 tied to die substrate - requires floating or shorting to pin 2.	Compatible with standard SOT23 footprints; avoids EOL SC70-5 sourcing risk and offers better thermal dissipation (380°C/W vs. SC70-5's ~450°C/W).	Select for new designs requiring long-term availability and improved thermal performance in continuous 10 mA operation.
TLVH431ACDBVR	Adjustable 1.24V–18V shunt reference, ±0.5% initial tolerance, 100 ppm/°C TC, but requires two external resistors to set 3.0V output.	Offers programmability and higher voltage headroom; less suitable for space-constrained layouts due to resistor count and footprint.	Choose when system-level flexibility (e.g., multiple reference voltages) outweighs component count and board area constraints.

Compared with LM4040C30FTA, the H5 variant shares identical electrical specs but faces EOL supply risk and higher thermal resistance; versus TLVH431ACDBVR, it delivers fixed 3.0V with zero external components but lacks adjustability - making it optimal for compact, cost-sensitive, single-voltage reference needs.

Availability

LM4040C30H5TA is available at Aetrix Electronics and suitable for battery-powered equipment, portable instrumentation, and data acquisition systems requiring stable component supply despite its End-of-Life status in the SC70-5 package.

Supply support for LM4040C30H5TA 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 high-reliability, energy-efficient solutions for industrial, computing, and consumer markets.

The LM4040 series belongs to Diodes' precision analog portfolio, designed specifically for micro-power, space-constrained voltage reference applications where stability, low noise, and wide operating current range are essential.

FAQ

Is LM4040C30H5TA still in active production?

No - Diodes Incorporated has marked all H5 (SC70-5) variants of the LM4040 as End-of-Life per their ordering information table. LM4040C30FTA in SOT23-3 is the active, recommended replacement with identical electrical specifications and enhanced thermal performance.

What is the correct PCB layout for LM4040C30H5TA's pin 2 and pin 3?

Per Diodes' datasheet, pin 2 (Cathode) must be left floating or connected to pin 1 (Anode); pin 3 is a no-connect terminal and must remain unconnected on the PCB. Soldering pin 3 risks mechanical stress or unintended substrate coupling due to internal die attachment.

Can LM4040C30H5TA drive a 10 kΩ load directly?

Yes - with 3.0V output and minimum 60 µA operating current, it can source up to 300 µA into a 10 kΩ load (I = 3.0V / 10 kΩ = 300 µA), well within its 15 mA maximum rating. Ensure series resistor R_S is sized to maintain ≥60 µA cathode current under worst-case supply and load conditions.

How does LM4040C30H5TA's noise performance compare to bandgap references in SOT23?

At 35 µV_RMS (10 Hz–10 kHz), LM4040C30H5TA matches or exceeds most fixed-output bandgap shunt references in comparable packages. Its low-noise design stems from optimized bandgap core and minimized parasitic capacitance - verified in Diodes' typical characteristics plots on page 9 of DS33195 Rev. 8.

LM4040C30H5TA 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):: 3V

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:: 70 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-70-5

LM4040C30H5TA FAQ

1.How can I place an order for LM4040C30H5TA through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040C30H5TA 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 LM4040C30H5TA reliable?

The price and inventory of LM4040C30H5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C30H5TA is usually 5 days.

3.What payment methods are accepted for LM4040C30H5TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C30H5TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040C30H5TA?

LM4040C30H5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040C30H5TA 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 LM4040C30H5TA?

For technical support, including LM4040C30H5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C30H5TA requirements.

6.How does Aetrix verify that LM4040C30H5TA is sourced from the original manufacturer or authorized distributors?

All LM4040C30H5TA 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 LM4040C30H5TA meets industry standards.

7.What is the process for return or replacement of LM4040C30H5TA?

All LM4040C30H5TA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C30H5TA, 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 LM4040C30H5TA part is unused and in its original packaging.

Return procedure for LM4040C30H5TA:

1.Submit a request within 90 days.

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

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