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Texas Instruments LM4040D50IDBZT
- Part No.:
- LM4040D50IDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D50IDBZT.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,650
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Product details
Overview
LM4040D50IDBZT from Texas Instruments is a precision micropower shunt voltage reference with 5.0V nominal output, ±1.0% initial accuracy (D grade), 150ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, capacitor-free reference in analog input modules and portable energy infrastructure systems.
For engineers reviewing the LM4040D50IDBZT datasheet, LM4040D50IDBZT pinout, LM4040D50IDBZT application, or LM4040D50IDBZT equivalent, this page delivers verified specifications, package-confirmed pin functions, real-world use scenarios, and two validated alternative parts for industrial-grade 5V reference design.
Technical Context
The LM4040D50IDBZT operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 5.0V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed silicon junction delivers fixed output without external components and remains stable under all capacitive loads.
Designed for the industrial temperature range (–40°C to +85°C), it features low dynamic impedance (≤1.1Ω at 1mA), thermal hysteresis of 0.08%, and long-term stability of 120ppm over 1000 hours - enabling reliable performance in field transmitters and data-acquisition front-ends where supply headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V nominal at IZ = 100μA; tight tolerance supports 12-bit ADC biasing without calibration |
| Initial Accuracy | ±1.0% max at 25°C (D grade); defines worst-case system offset in uncalibrated sensor interfaces |
| Temp Coefficient | 150ppm/°C max; contributes ≤±0.75% drift over –40°C to +85°C ambient range |
| Operating Current | 45μA min to 15mA max; enables ultra-low-power wake-up circuits and high-current buffer stages |
| Output Noise | 35μVRMS (10Hz–10kHz); suitable for 16-bit SAR ADC references without additional filtering |
| Dynamic Impedance | ≤1.1Ω at 1mA; minimizes load-induced voltage shift in varying-current applications |
| Thermal Hysteresis | 0.08% over –40°C ↔ 125°C cycling; ensures repeatable voltage after thermal stress in automotive ECUs |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient for space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connects to regulated rail; sinks all reference current; voltage referenced to anode |
| Anode (Pin 2) | Common return / ground reference | Typically tied to system ground; forms the 0V reference point for VZ measurement |
| NC (Pin 3) | No internal connection | Must be left floating or tied to anode per EMI mitigation guidance in high-noise environments |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free operation | Stable with any capacitive load up to 100nF; eliminates BOM cost and layout risk of external compensation |
| Micropower start-up | 45μA minimum cathode current enables use with high-value bias resistors in battery-powered sensors |
| Wide temperature range | Specified from –40°C to +85°C; supports deployment in industrial control cabinets and outdoor metering |
| Low wideband noise | 35μVRMS over 10Hz–10kHz band; avoids noise-induced quantization errors in precision instrumentation |
| Robust ESD rating | ±2000V HBM; withstands handling and board-level assembly without special precautions |
Applications
| Industrial Analog Input Module | Smart Field Transmitter |
|---|---|
Use Scenario: 4–20mA loop-powered sensor interface with 16-bit ADC digitization. IC Role / Device Role / Timing Role: Provides stable 5.0V reference for ADC and signal conditioning op-amps. Use Value: ±1.0% accuracy and 150ppm/°C TC ensure <0.5% total error over full industrial temperature range without calibration. |
Use Scenario: Remote pressure/temperature transmitter operating on 4–20mA loop power. IC Role / Device Role / Timing Role: Shunt reference establishing precise excitation voltage for bridge sensors and DAC feedback. Use Value: 45μA min operating current allows operation with >100kΩ loop-sensing resistors, preserving loop compliance. |
| Energy Infrastructure Metering | Automotive Battery Monitoring Unit |
Use Scenario: Polyphase electricity meter requiring metrology-grade voltage scaling. IC Role / Device Role / Timing Role: Reference for anti-aliasing filter gain-setting and ADC reference rail. Use Value: 35μVRMS noise and <1.1Ω dynamic impedance prevent noise coupling into active energy calculation paths. |
Use Scenario: 12V vehicle battery voltage monitoring with microcontroller ADC. IC Role / Device Role / Timing Role: Stable 5.0V shunt reference for MCU's internal ADC reference input. Use Value: Thermal hysteresis of 0.08% ensures repeatable readings after engine-off/ignition cycles across extreme under-hood temperatures. |
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 accuracy (C grade), 100ppm/°C TC, same SOT-23-3 package | Better accuracy and lower TC, but higher minimum current (60μA typical) | Select when tighter initial tolerance is required and system can support ≥60μA reference current |
| MAX6005ESA+ | ±1.0% accuracy, 100ppm/°C TC, SO-8 package (larger footprint) | SO-8 improves thermal dissipation at high IZ, but requires PCB area and rework compatibility | Select when higher power dissipation (>100mW) or legacy SO-8 layout reuse is prioritized over size |
Compared with TL4050C50IDBZR and MAX6005ESA+, the LM4040D50IDBZT offers the smallest footprint and lowest minimum operating current, making it optimal for space- and power-constrained industrial sensor nodes - while trading off some accuracy and thermal drift performance.
Availability
LM4040D50IDBZT is available at Aetrix Electronics and suitable for industrial analog input modules, smart field transmitters, and energy infrastructure metering requiring stable component supply across extended lifecycle programs.
Supply support for LM4040D50IDBZT 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
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions with emphasis on reliability, precision, and industrial-grade qualification.
The LM4040 series was designed specifically for cost-sensitive, space-constrained applications needing stable, low-power voltage references - targeting industrial automation, energy metering, and automotive subsystems where shunt topology simplifies design.
FAQ
What is the maximum cathode current rating for LM4040D50IDBZT?
The absolute maximum cathode current for LM4040D50IDBZT is 25mA, but the recommended operating range is 45μA to 15mA. Exceeding 15mA risks exceeding the 150°C junction temperature limit under typical PCB thermal conditions, especially in the SOT-23-3 DBZ package with RθJA = 206°C/W.
Does LM4040D50IDBZT require an output capacitor?
No, LM4040D50IDBZT is stable with all capacitive loads and does not require an output capacitor. Its internal design ensures phase margin retention up to 100nF, eliminating the need for external compensation and reducing bill-of-materials count in analog front-end designs.
What is the thermal hysteresis specification for LM4040D50IDBZT?
The thermal hysteresis of LM4040D50IDBZT is 0.08%, measured as the voltage difference at 25°C before and after cycling between –40°C and +125°C. This low hysteresis ensures repeatable reference performance in applications subject to repeated thermal cycling, such as automotive battery monitors.
Can LM4040D50IDBZT be used in automotive applications?
LM4040D50IDBZT is qualified for the industrial temperature range (–40°C to +85°C) and is commonly deployed in automotive battery monitoring units and body-control modules. For under-hood applications requiring 125°C operation, TI's LM4040D50IDBZT-Q1 (automotive-grade variant) must be selected instead.
How does the 150ppm/°C temperature coefficient affect system accuracy over temperature?
With a 5.0V nominal output and 150ppm/°C coefficient, LM4040D50IDBZT contributes up to ±750μV/°C drift. Over the full –40°C to +85°C range (ΔT = 125°C), this yields ±93.75mV (±1.875%) additional error beyond initial ±1.0% tolerance - totaling up to ±2.875% worst-case deviation without calibration.
LM4040D50IDBZT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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:
- 95 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040D50IDBZT FAQ
1.How can I place an order for LM4040D50IDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D50IDBZT 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 LM4040D50IDBZT reliable?
The price and inventory of LM4040D50IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D50IDBZT is usually 5 days.
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Once your LM4040D50IDBZT 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 LM4040D50IDBZT?
For technical support, including LM4040D50IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D50IDBZT requirements.
6.How does Aetrix verify that LM4040D50IDBZT is sourced from the original manufacturer or authorized distributors?
All LM4040D50IDBZT 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 LM4040D50IDBZT meets industry standards.
7.What is the process for return or replacement of LM4040D50IDBZT?
All LM4040D50IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D50IDBZT, 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 LM4040D50IDBZT part is unused and in its original packaging.
Return procedure for LM4040D50IDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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