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Diodes Incorporated LM4040C30FTA
- Part No.:
- LM4040C30FTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C30FTA.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:22,550
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Product details
Overview
LM4040C30FTA from Diodes Incorporated is a precision 3.0V shunt voltage reference in SOT23 package, rated for ±0.5% initial tolerance at +25°C, 20ppm/°C typical temperature coefficient, and stable operation from 60µA to 15mA reverse current - used as a compact, low-noise reference in portable power monitoring and ADC biasing circuits.
For engineers reviewing the LM4040C30FTA datasheet, LM4040C30FTA pinout, LM4040C30FTA application, or LM4040C30FTA equivalent, key selection criteria include reverse breakdown voltage accuracy over -40°C to +125°C, dynamic impedance below 0.9Ω at 1mA, noise performance of 35µVRMS (10Hz–10kHz), and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040C30FTA operates as a two-terminal bandgap shunt reference, requiring only an external series resistor to regulate output voltage. Its internal architecture maintains stable 3.0V reverse breakdown across 60µA–15mA operating current and -40°C to +125°C ambient range.
It achieves 35µVRMS broadband noise (10Hz–10kHz) and ≤0.9Ω dynamic output impedance at 1mA, enabling high-precision analog signal conditioning without output capacitance - critical for space-constrained battery-powered systems where layout parasitics must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 3.0V nominal reverse breakdown voltage, tightly regulated for ADC reference and sensor excitation |
| Initial Tolerance | ±0.5% at +25°C - ensures system-level calibration accuracy without post-manufacture trimming |
| Temp Coefficient | ≤100ppm/°C max (−40°C to +125°C) - supports stable performance in automotive and industrial environments |
| Operating Current | 60µA to 15mA reverse current range - enables ultra-low-power sleep modes and high-current transient response |
| Noise (10Hz–10kHz) | 35µVRMS - minimizes quantization error in 16-bit+ data acquisition systems |
| Dynamic Impedance | 0.9Ω max at 1mA - reduces load-induced voltage droop during fast analog sampling events |
| Long-Term Stability | 120ppm over 1000 hours - ensures consistent reference integrity in field-deployed instrumentation |
Pinout & Package
LM4040C30FTA uses the industry-standard SOT23 surface-mount package (3-pin, 2.4mm × 1.3mm footprint). Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is internally connected to the die substrate - must be left floating or tied to Pin 2 per Diodes Incorporated layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Reference ground node; connects to system GND or return path in shunt regulator configuration |
| Pin 2 | Cathode | 3.0V output node; supplies reference voltage to ADCs, DACs, or comparator inputs |
| Pin 3 | Substrate Tie | Internally bonded to die backside; must float or connect to Pin 2 - not used as signal terminal |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable operation with ≥1µF capacitive load - eliminates BOM cost and PCB area for decoupling |
| Low reverse leakage | 60µA minimum operating current - extends battery life in always-on sensing nodes |
| Thermal hysteresis | 0.08% max - prevents reference drift after thermal cycling in outdoor equipment |
| Lead-free & RoHS 3 compliant | Fully halogen- and antimony-free SOT23 package - meets IPC-J-STD-020 moisture sensitivity level 1 |
| Wide temperature range | −40°C to +125°C operation - qualified for under-hood automotive and industrial control applications |
Applications
| Battery-Powered Instrumentation | Precision Data Acquisition |
|---|---|
|
Use Scenario: Portable multimeter measuring 0–30V DC with 0.1% full-scale accuracy. IC Role / Device Role / Timing Role: Shunt reference providing stable 3.0V基准 for 24-bit sigma-delta ADC and gain-setting resistors. Use Value: ±0.5% initial tolerance and 100ppm/°C TC ensure measurement repeatability across temperature without recalibration. |
Use Scenario: Industrial PLC analog input module digitizing 4–20mA sensor signals. IC Role / Device Role / Timing Role: Reference source for programmable gain instrumentation amplifier and SAR ADC front-end. Use Value: 35µVRMS low noise and 0.9Ω dynamic impedance prevent SNR degradation during multiplexed channel scanning. |
| Portable Communications | Notebook Power Management |
|
Use Scenario: LTE modem RF front-end requiring precise 3.0V bias for LNA and mixer stages. IC Role / Device Role / Timing Role: Low-noise voltage reference for RF IC bias networks and envelope tracking control loops. Use Value: Stable 3.0V output under 60µA–15mA load variation enables clean RF signal generation without supply ripple coupling. |
Use Scenario: Notebook motherboard VRM monitoring circuit detecting 3.3V rail deviation. IC Role / Device Role / Timing Role: Precision threshold reference for supervisor IC comparators and PMIC fault detection logic. Use Value: Long-term stability (120ppm/1000h) ensures reliable brown-out detection over product lifetime without false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable 1.24V–18V output; 0.5% tolerance; higher 1.5Ω dynamic impedance at 1mA | Requires two external resistors for 3.0V setting; less suitable for ultra-low-noise ADC references | Choose when design flexibility across multiple voltages outweighs noise and impedance requirements |
| MAX6003EUR+T | Fixed 3.0V; 0.2% tolerance; 20ppm/°C TC; 1.2µA typical quiescent current | Higher precision but limited 100µA–10mA operating range - unsuitable for high-current load transients | Prefer for battery-critical applications needing tighter initial accuracy and lower min current |
Compared with TLVH431ACDBVR and MAX6003EUR+T, the LM4040C30FTA delivers optimal balance of low noise (35µVRMS), low dynamic impedance (0.9Ω), and wide current range (60µA–15mA), making it ideal for mixed-signal systems demanding both precision and robustness.
Availability
LM4040C30FTA is available at Aetrix Electronics and suitable for battery-powered instrumentation, precision data acquisition, and portable communications requiring stable component supply with full traceability and long-lifecycle support.
Supply support for LM4040C30FTA 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 solutions, with manufacturing ISO/TS 16949-certified facilities and broad distribution reach.
The LM4040 family targets precision analog subsystems in space-constrained, low-power applications - designed specifically to replace larger, noisier references while maintaining grade-A stability across extended temperature ranges.
FAQ
What is the maximum reverse current rating for LM4040C30FTA?
The absolute maximum continuous reverse current is 20mA, but the recommended operating range is 60µA to 15mA per the datasheet. Exceeding 15mA risks thermal instability and accelerated long-term drift, especially above +85°C ambient. Derating is advised for sustained operation near the upper limit.
Can LM4040C30FTA drive a 1000pF capacitive load directly?
Yes - the device is explicitly characterized for stability with ≥1µF tantalum or ceramic output capacitance, and remains stable with smaller loads including 1000pF. No series resistance or isolation is required, unlike many older shunt references that oscillate with even modest capacitive loading.
How does the pin 3 connection affect PCB layout?
Pin 3 is internally connected to the silicon substrate and must either float or be tied to Pin 2 (Cathode). Connecting Pin 3 to ground or leaving it unconnected while Pin 2 is active may cause unpredictable leakage or thermal coupling. The SOT23 pad layout must follow Diodes' recommended footprint to avoid solder bridging or thermal stress.
Is LM4040C30FTA qualified for automotive applications?
No - the LM4040C30FTA is an industrial-grade part. For automotive use, Diodes offers the LM4040Q series (e.g., LM4040C30QFTA), which is AEC-Q100 Grade 1 qualified (−40°C to +125°C) and manufactured in IATF 16949-certified facilities with enhanced reliability testing and lot traceability.
LM4040C30FTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- SOT-23-3
LM4040C30FTA FAQ
1.How can I place an order for LM4040C30FTA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C30FTA 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 LM4040C30FTA reliable?
The price and inventory of LM4040C30FTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C30FTA is usually 5 days.
3.What payment methods are accepted for LM4040C30FTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C30FTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C30FTA?
LM4040C30FTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C30FTA 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 LM4040C30FTA?
For technical support, including LM4040C30FTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C30FTA requirements.
6.How does Aetrix verify that LM4040C30FTA is sourced from the original manufacturer or authorized distributors?
All LM4040C30FTA 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 LM4040C30FTA meets industry standards.
7.What is the process for return or replacement of LM4040C30FTA?
All LM4040C30FTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C30FTA, 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 LM4040C30FTA part is unused and in its original packaging.
Return procedure for LM4040C30FTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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