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Texas Instruments LM4040D25QDBZR
- Part No.:
- LM4040D25QDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D25QDBZR.pdf
- Description:
- IC VREF SHUNT 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,927
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Product details
Overview
LM4040D25QDBZR from Texas Instruments is a precision micropower shunt voltage reference with 2.5V nominal output, D-grade (±1.0% initial tolerance), rated for –40°C to 125°C operation in SOT-23-3 (DBZ) package. It delivers low noise (35μVRMS), stable performance across 45μA–15mA cathode current, and requires no output capacitor-used in high-accuracy analog input modules and automotive sensor signal conditioning.
For engineers reviewing the LM4040D25QDBZR datasheet, LM4040D25QDBZR pinout, LM4040D25QDBZR application, or LM4040D25QDBZR equivalent, key selection criteria include extended temperature stability, shunt reference dynamic impedance (≤1.1Ω at 1mA), thermal hysteresis (0.08%), and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040D25QDBZR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.5V reverse breakdown voltage across its cathode-anode terminals. Its Zener-zap trimmed bandgap architecture achieves ±1.0% initial accuracy and 150ppm/°C max temperature coefficient over –40°C to 125°C.
It exhibits low dynamic impedance (≤1.1Ω at 1mA, 120Hz), wide operating current range (45μA typical minimum), and intrinsic stability with all capacitive loads-eliminating need for output capacitance while maintaining regulation under varying load and line conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal at IZ = 100μA; enables direct interface with 2.5V ADC references and precision DAC biasing |
| Initial Tolerance | ±1.0% at 25°C (D grade); defines worst-case DC offset in calibration-critical systems |
| Temp Coefficient | 150ppm/°C max over –40°C to 125°C; contributes ≤±0.25V drift across full range |
| Dynamic Impedance | ≤1.1Ω at IZ = 1mA, 120Hz; ensures minimal output voltage shift under dynamic load transients |
| Output Noise | 35μVRMS (10Hz–10kHz); supports <16-bit ENOB in high-resolution data acquisition |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-backed monitoring circuits |
| Thermal Hysteresis | 0.08%; limits repeatability error after thermal cycling in field-deployed equipment |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally enhanced plastic body with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Connected to regulated supply rail; sinks current to maintain 2.5V drop relative to anode |
| Anode (Pin 2) | Reference ground / common return | Typically tied to system ground; forms reference potential for cathode voltage |
| NC (Pin 3) | No internal connection | Must be left unconnected or tied to anode per EMI mitigation guidance in high-noise environments |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates reliably with any capacitive load (0–∞), removing BOM cost and layout constraints of output filtering |
| Extended temperature rating | Specified from –40°C to 125°C ambient, supporting under-hood automotive and industrial control applications |
| Low micropower operation | 45μA typical minimum cathode current enables >10-year battery life in wireless sensor nodes |
| Low thermal hysteresis | 0.08% voltage shift after –40°C ↔ 125°C thermal cycling improves long-term measurement repeatability |
| Zener-zap voltage trim | Fuse-based wafer-level trimming achieves tight initial tolerance without post-package adjustment |
Applications
| Industrial Analog Input Module | Automotive Field Transmitter |
|---|---|
Use Scenario: High-channel-count PLC analog input card measuring 4–20mA sensor loops with 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5V reference for ADC VREF and signal-conditioning op-amp biasing. Use Value: ±1.0% initial tolerance and 150ppm/°C TC ensure <0.1% total unadjusted error across industrial temperature range. | Use Scenario: Engine coolant temperature transmitter with integrated signal conditioning and CAN output. IC Role / Device Role / Timing Role: Precision voltage reference for RTD-to-digital conversion circuitry operating in under-hood environment. Use Value: –40°C to 125°C qualification and 0.08% thermal hysteresis enable repeatable calibration after thermal stress cycles. |
| Energy Infrastructure Metering | Portable Precision Audio Converter |
Use Scenario: Revenue-grade electricity meter requiring metrology-grade voltage reference for ADC front-end. IC Role / Device Role / Timing Role: Low-noise (35μVRMS), low-drift shunt reference for polyphase energy measurement ASICs. Use Value: 35μVRMS noise floor supports >16-bit effective resolution; long-term stability (120ppm/1000h) maintains accuracy over 10+ year service life. | Use Scenario: Battery-powered handheld audio recorder with 24-bit delta-sigma ADC and headphone amplifier. IC Role / Device Role / Timing Role: Micropower 2.5V reference for ADC/DAC biasing and analog gain stage referencing. Use Value: 45μA min cathode current enables ultra-low standby power; capacitor-free operation simplifies compact PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C25IDBZR | Same 2.5V output, C-grade (±0.5%), –40°C to 125°C, SOT-23-3; lower tempco (100ppm/°C), higher min current (60μA) | Better initial accuracy and tempco, but higher quiescent current reduces battery life in ultra-low-power designs | Select when tighter DC accuracy outweighs micropower requirements |
| MAX6008BAUT25+T | 2.5V, A-grade (±0.1%), –40°C to 125°C, SOT-23-3; 30ppm/°C tempco, 75μA min current, 20μVRMS noise | Superior noise and tempco, but higher cost and current draw limit use in energy-harvesting systems | Select for metrology-grade applications where 20μVRMS noise and 30ppm/°C TC are critical |
Compared with TL4050C25IDBZR and MAX6008BAUT25+T, the LM4040D25QDBZR trades initial accuracy and noise performance for lowest possible operating current-making it optimal for cost-sensitive, extended-temperature, battery-constrained systems where ±1.0% tolerance is acceptable.
Availability
LM4040D25QDBZR is available at Aetrix Electronics and suitable for industrial analog input modules, automotive field transmitters, and energy infrastructure metering requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4040D25QDBZR 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The LM4040 series was designed for high-accuracy, low-power shunt reference applications in harsh environments-including automotive, industrial automation, and energy metering-where reliability across wide temperature ranges is essential.
FAQ
What is the maximum cathode current rating for LM4040D25QDBZR?
The absolute maximum cathode current for LM4040D25QDBZR is 25mA, per TI's Absolute Maximum Ratings. However, the recommended operating range is 45μA to 15mA. Operating above 15mA may increase self-heating and degrade long-term stability; sustained operation near 25mA requires careful thermal design due to the SOT-23-3 package's 206°C/W junction-to-ambient thermal resistance.
Does LM4040D25QDBZR require an output capacitor for stability?
No, LM4040D25QDBZR is inherently stable with all capacitive loads and does not require an external output capacitor. This is confirmed in TI's datasheet Section 3 and Section 8.2, which state "stable with all capacitive loads; no output capacitor required." The device's low dynamic impedance and internal compensation eliminate oscillation risk even with large (>10μF) bypass caps.
What is the thermal hysteresis specification for LM4040D25QDBZR?
The thermal hysteresis for LM4040D25QDBZR is 0.08%, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to 125°C. This value is identical across all LM4040 grades and packages, and is specified in Tables 6.5–6.10 of the datasheet under parameter VHYST. It directly impacts repeatability in field-redeployed equipment.
Can LM4040D25QDBZR be used in place of LM4040C25QDBZR?
Yes, LM4040D25QDBZR can substitute for LM4040C25QDBZR in applications tolerant of ±1.0% initial accuracy instead of ±0.5%. Both share identical package (SOT-23-3), temperature range (–40°C to 125°C), pinout, and electrical behavior-only differing in initial tolerance and max temperature coefficient (150ppm/°C vs. 100ppm/°C). No PCB changes are needed, but system-level calibration may require adjustment.
What is the long-term stability of LM4040D25QDBZR after 1000 hours?
The long-term stability of LM4040D25QDBZR is 120ppm after 1000 hours of operation at 25°C with 100μA cathode current, as specified in all relevant electrical characteristics tables (e.g., Section 6.10). This represents the typical parametric drift under controlled burn-in conditions and serves as a baseline for predicting aging effects in 10–15 year deployments.
LM4040D25QDBZR 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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040D25QDBZR FAQ
1.How can I place an order for LM4040D25QDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D25QDBZR 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 LM4040D25QDBZR reliable?
The price and inventory of LM4040D25QDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D25QDBZR is usually 5 days.
3.What payment methods are accepted for LM4040D25QDBZR?
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LM4040D25QDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D25QDBZR 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 LM4040D25QDBZR?
For technical support, including LM4040D25QDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D25QDBZR requirements.
6.How does Aetrix verify that LM4040D25QDBZR is sourced from the original manufacturer or authorized distributors?
All LM4040D25QDBZR 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 LM4040D25QDBZR meets industry standards.
7.What is the process for return or replacement of LM4040D25QDBZR?
All LM4040D25QDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D25QDBZR, 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 LM4040D25QDBZR part is unused and in its original packaging.
Return procedure for LM4040D25QDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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