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Diodes Incorporated LM4040D50FTA
- Part No.:
- LM4040D50FTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D50FTA.pdf
- Description:
- IC VREF SHUNT 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,106
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Product details
Overview
LM4040D50FTA from Diodes Incorporated is a precision 5.0V shunt voltage reference in SOT23 package, rated for ±1% initial tolerance at +25°C, 60µA to 15mA operating current, 100ppm/°C max temperature coefficient, and −40°C to +125°C operation-used in battery-powered instrumentation and portable data acquisition systems requiring stable low-power reference.
For engineers reviewing the LM4040D50FTA datasheet, LM4040D50FTA pinout, LM4040D50FTA application, or LM4040D50FTA equivalent, key selection criteria include reverse breakdown voltage tolerance at temperature extremes, dynamic impedance under varying load current, noise performance (80µVRMS, 10Hz–10kHz), and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040D50FTA operates as a two-terminal bandgap-based shunt reference, sinking current through its cathode to maintain a precise 5.0V reverse breakdown voltage across its anode-cathode terminals. It requires no output capacitor and remains stable with capacitive loads up to 1.0µF tantalum.
Its internal architecture delivers low thermal hysteresis (0.08%), long-term stability (120ppm over 1000 hours), and low dynamic output impedance (1.5Ω at 1mA/120Hz), enabling accurate voltage regulation in high-precision analog signal chains and ADC/DAC biasing circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 5.0V nominal reverse breakdown voltage at 100µA, ±50mV (±1%) tolerance at +25°C |
| Temp Coefficient | ≤100ppm/°C max over −40°C to +125°C-limits drift-induced error in wide-temperature industrial sensing |
| Operating Current | 60µA to 15mA range-supports ultra-low-power sleep modes and high-current precision calibration |
| Noise (10Hz–10kHz) | 80µVRMS-enables sub-LSB accuracy in 16-bit+ data acquisition systems |
| Dynamic Impedance | 1.5Ω at 1mA/120Hz-minimizes load-induced voltage sag during transient current demands |
| Long-Term Stability | 120ppm non-cumulative drift over 1000 hours-reduces recalibration frequency in field-deployed equipment |
| Thermal Hysteresis | 0.08%-ensures repeatable voltage output after thermal cycling in portable test gear |
Pinout & Package
SOT23-3 surface-mount package with 2.4mm × 1.3mm footprint, die attached to pin 3; pin 3 must be left floating or connected to pin 2 per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground terminal | Common return path for shunt current; connects to system GND or low-impedance reference plane |
| Cathode (Pin 2) | Output voltage node | Sinks current to maintain 5.0V between cathode and anode; connects to series resistor and load |
| NC / Die Attach (Pin 3) | Internal die connection | Electrically tied to pin 2 internally; must float or short to pin 2-never driven externally |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with 0–1.0µF capacitive loads-simplifies PCB layout and eliminates BOM cost for decoupling caps |
| Wide operating current range | 60µA to 15mA-supports both microamp-level sensor biasing and milliamp-level reference buffering |
| Low noise performance | 80µVRMS (10Hz–10kHz)-preserves SNR in precision ADC front-ends and low-noise amplifiers |
| Extended temperature range | −40°C to +125°C operation-enables use in automotive under-hood modules and industrial motor drives |
| Green, RoHS-compliant packaging | Lead-free, halogen- and antimony-free SOT23-meets EU RoHS 3 (2015/863/EU) and automotive supply chain requirements |
Applications
| Battery-Powered Multimeters | Precision Data Loggers |
|---|---|
|
Use Scenario: Handheld digital multimeter measuring DC voltage with 0.1% accuracy over −10°C to +50°C ambient. IC Role / Device Role / Timing Role: Shunt reference providing stable 5.0V reference for 24-bit sigma-delta ADC and internal DAC calibration. Use Value: ±1% initial tolerance and 100ppm/°C tempco ensure full-scale error stays within spec across battery discharge and environmental temperature swings. |
Use Scenario: Industrial wireless sensor node logging temperature and pressure every 10 seconds using coin-cell power. IC Role / Device Role / Timing Role: Low-quiescent-current voltage reference for analog front-end and microcontroller ADC reference input. Use Value: 60µA minimum operating current enables continuous reference operation during deep-sleep intervals, extending battery life beyond 5 years. |
| Portable ECG Monitors | Programmable Logic Controller (PLC) Analog Input Modules |
|
Use Scenario: Clinical-grade wearable ECG device acquiring biopotential signals with <5µV RMS noise floor. IC Role / Device Role / Timing Role: Low-noise 5.0V reference for instrumentation amplifier gain-setting and ADC reference rail. Use Value: 80µVRMS broadband noise ensures ECG signal integrity is preserved without degrading diagnostic resolution. |
Use Scenario: DIN-rail mounted PLC module conditioning 4–20mA sensor inputs with 16-bit resolution and cold-junction compensation. IC Role / Device Role / Timing Role: Stable reference for precision current-to-voltage conversion and thermocouple offset correction circuitry. Use Value: 120ppm long-term stability and 0.08% thermal hysteresis minimize calibration drift across 10+ year field deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C50IDBZR | ±0.5% initial tolerance, 75ppm/°C max tempco, 50µA min operating current | Higher accuracy and lower drift, but tighter min current limits design flexibility in ultra-low-power modes | Select when ±0.5% tolerance and <75ppm/°C drift are mandatory; verify 50µA minimum current aligns with system sleep budget |
| MAX6005EUR+T | ±0.2% initial tolerance, 20ppm/°C max tempco, 100µA min operating current, SC70-5 package | Superior precision and stability, but higher min current and obsolete SC70-5 footprint increases layout risk | Choose only if legacy board reuse justifies SC70-5 compatibility; otherwise prefer SOT23 alternatives for new designs |
Compared with TL4050C50IDBZR and MAX6005EUR+T, the LM4040D50FTA trades initial accuracy for wider operating current range and robust SOT23 packaging-making it optimal for cost-sensitive, space-constrained, and wide-temperature industrial applications where ±1% tolerance is acceptable.
Availability
LM4040D50FTA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable data loggers, and industrial sensor interfaces requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4040D50FTA 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 manufacturer specializing in discrete, analog, and mixed-signal components, with emphasis on power management, signal integrity, and precision analog solutions.
The LM4040 series belongs to Diodes' precision voltage reference product line, engineered for high-accuracy, low-power, and temperature-stable operation in portable, industrial, and automotive-qualified systems.
FAQ
What is the minimum operating current for LM4040D50FTA at −40°C?
The LM4040D50FTA requires a minimum reverse current of 83µA at −40°C to maintain specified voltage accuracy, per Electrical Characteristics table. This value rises from the +25°C minimum of 74µA due to increased bandgap voltage sensitivity at cold temperatures, and must be accounted for in series resistor sizing for worst-case low-temperature operation.
Can LM4040D50FTA drive a 100nF ceramic capacitor directly?
Yes-the LM4040D50FTA is explicitly designed to remain stable with capacitive loads up to 1.0µF, including ceramic types. Its internal compensation eliminates need for series resistance or external isolation, enabling direct connection to 100nF bypass caps used in ADC reference decoupling without oscillation or overshoot.
How does the 0.08% thermal hysteresis impact repeated temperature cycling?
A 0.08% thermal hysteresis means the output voltage may shift by up to ±0.004V (0.08% of 5.0V) after cycling between −40°C and +125°C and returning to room temperature. This is non-cumulative and fully reversible-critical for field-repairable test equipment that undergoes frequent thermal stress without recalibration.
Is LM4040D50FTA qualified for automotive applications?
No-the LM4040D50FTA is not AEC-Q100 qualified. For automotive use, Diodes offers the LM4040Q series (e.g., LM4040Q50IDBZR), which undergoes additional stress testing, lot traceability, and failure analysis per AEC-Q100 Grade 1 (−40°C to +125°C) requirements and is documented in a separate datasheet.
LM4040D50FTA 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 80µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 88 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040D50FTA FAQ
1.How can I place an order for LM4040D50FTA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D50FTA 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 LM4040D50FTA reliable?
The price and inventory of LM4040D50FTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D50FTA is usually 5 days.
3.What payment methods are accepted for LM4040D50FTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D50FTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040D50FTA?
LM4040D50FTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D50FTA 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 LM4040D50FTA?
For technical support, including LM4040D50FTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D50FTA requirements.
6.How does Aetrix verify that LM4040D50FTA is sourced from the original manufacturer or authorized distributors?
All LM4040D50FTA 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 LM4040D50FTA meets industry standards.
7.What is the process for return or replacement of LM4040D50FTA?
All LM4040D50FTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D50FTA, 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 LM4040D50FTA part is unused and in its original packaging.
Return procedure for LM4040D50FTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040D50FTA Tags
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