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Texas Instruments LM4040B25IDBZRG4
- Part No.:
- LM4040B25IDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040B25IDBZRG4.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,654
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Product details
Overview
LM4040B25IDBZRG4 from Texas Instruments is a precision 2.5V shunt voltage reference in SOT-23-3 (DBZ) package, rated for –40°C to 85°C operation. It delivers ±0.2% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, 0.8Ω dynamic impedance at 1mA, and stable operation down to 45μA cathode current. It serves as a low-power, high-stability reference in analog-to-digital converters and sensor signal conditioning circuits.
For engineers reviewing the LM4040B25IDBZRG4 datasheet, LM4040B25IDBZRG4 pinout, LM4040B25IDBZRG4 application, or LM4040B25IDBZRG4 equivalent, key selection criteria include guaranteed 2.5V output tolerance over temperature, minimal load regulation error (<8mV across 1mA–15mA), compatibility with all capacitive loads without external compensation, and qualification for industrial-grade ambient operation.
Technical Context
The LM4040B25IDBZRG4 operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 2.5V reverse breakdown voltage (VZ) across its terminals. Its Zener-zap trimmed bandgap architecture ensures tight initial tolerance and low thermal drift without requiring external components.
It achieves stability via low dynamic impedance (0.8Ω typical at 1mA) and inherently damps oscillation across full capacitive loading conditions - eliminating need for output capacitance. The device's thermal hysteresis is limited to 0.08%, and long-term stability is 120ppm after 1000 hours at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal; ±0.2% initial accuracy at 25°C ensures ≤±5mV absolute error in precision ADC biasing |
| Temp Coefficient | 100ppm/°C max; contributes ≤±16.25mV drift over –40°C to 85°C ambient range |
| Dynamic Impedance | 0.8Ω typical at 1mA; limits load regulation error to <8mV across 1mA–15mA cathode current swing |
| Wideband Noise | 35μVRMS (10Hz–10kHz); suitable for 16-bit+ SAR ADC reference without added filtering |
| Min Cathode Current | 45μA typical; enables ultra-low-power operation in battery-powered sensor nodes |
| Thermal Hysteresis | 0.08% max; guarantees repeatability of reference voltage after thermal cycling |
| Long-Term Stability | 120ppm after 1000h; supports calibration integrity in field-deployed instrumentation |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, lead-free, RoHS-compliant.
| 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 return | Typically tied to system ground; forms reference potential for VZ measurement |
| NC (Pin 3) | No internal connection | Must be left floating or connected to anode only in high-EMI environments per TI guidance |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with any capacitive load up to 100nF; eliminates BOM cost and layout area for decoupling cap |
| Micropower startup | Functional at 45μA cathode current; enables use in energy-harvesting and ultra-low-quiescent systems |
| Industrial temperature range | Specified from –40°C to +85°C; qualified for factory automation and outdoor metering applications |
| Low-noise Zener architecture | 35μVRMS noise floor supports high-resolution data acquisition without post-filtering |
| Fuse-trimmed precision | 0.2% initial tolerance achieved via wafer-level Zener-zap trimming; reduces calibration overhead |
Applications
| Analog Input Module | Data-Acquisition System |
|---|---|
Use Scenario: Signal conditioning front-end for 16-bit industrial PLC analog inputs. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for ADC driver and PGA gain-setting resistors. Use Value: Enables ±0.2% full-scale accuracy over temperature without recalibration. | Use Scenario: Portable multichannel data logger measuring thermocouples and strain gauges. IC Role / Device Role / Timing Role: Supplies reference voltage to successive-approximation ADC and sensor excitation circuitry. Use Value: 35μVRMS noise and 0.8Ω impedance preserve SNR >90dB in 100ksps sampling. |
| Field Transmitter | Energy Infrastructure |
Use Scenario: 4–20mA loop-powered temperature transmitter in oil & gas wellheads. IC Role / Device Role / Timing Role: References the DAC output and current-sense amplifier in the loop controller. Use Value: 45μA minimum operating current allows operation below 3.3V supply with margin. | Use Scenario: Smart electricity meter with metrology-grade voltage and current channel references. IC Role / Device Role / Timing Role: Serves as primary reference for polyphase energy measurement ICs (e.g., ADE79xx). Use Value: 120ppm long-term stability ensures meter accuracy compliance over 10-year field 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 |
|---|---|---|---|
| LM4040C25IDBZR | ±0.5% initial accuracy (vs. ±0.2%), same 100ppm/°C tempco and 35μVRMS noise | Acceptable where lower-cost calibration or relaxed system accuracy suffices | Select when total unadjusted error budget permits ±12.5mV reference error at 25°C |
| REF3025AIDBZR | Series topology; 2.5V, ±0.2% accuracy, 50ppm/°C, 25μVRMS noise, requires 1.2V headroom | Requires higher supply voltage; unsuitable for low-dropout or shunt-based topologies | Choose only if system has ≥3.7V supply and benefits from lower noise and tempco |
Compared with LM4040C25IDBZR, the LM4040B25IDBZRG4 provides tighter initial tolerance for reduced calibration effort; compared with REF3025AIDBZR, it enables direct shunt configuration with no headroom penalty but trades 10μVRMS noise and slightly higher tempco.
Availability
LM4040B25IDBZRG4 is available at Aetrix Electronics and suitable for analog input modules, data-acquisition systems, and field transmitters requiring stable component supply with traceable lot history and extended lifecycle support.
Supply support for LM4040B25IDBZRG4 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 delivering analog and embedded processing solutions, with leadership in precision analog ICs and industrial-grade reliability.
The LM4040 series targets cost-sensitive, space-constrained applications needing micropower, high-accuracy voltage references - especially in portable instrumentation, process control, and energy metering.
FAQ
What is the maximum cathode current rating for LM4040B25IDBZRG4?
The LM4040B25IDBZRG4 has an absolute maximum cathode current rating of 25mA, as specified in Section 6.1 of the datasheet. Continuous operation above 15mA is not recommended due to thermal derating; typical design practice limits IZ to ≤15mA to maintain junction temperature within safe limits under standard PCB copper pour conditions.
Does LM4040B25IDBZRG4 require an output capacitor for stability?
No, the LM4040B25IDBZRG4 is explicitly designed to be stable with all capacitive loads and does not require an output capacitor. This is confirmed in the "Features" section and "Description" of the datasheet. Adding external capacitance may even degrade transient response but will not cause oscillation.
What is the thermal hysteresis specification for LM4040B25IDBZRG4?
The LM4040B25IDBZRG4 exhibits a maximum thermal hysteresis of 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 consistent across all LM4040 grades and package variants, including LM4040B25IDBZRG4.
Can LM4040B25IDBZRG4 operate at –40°C to +125°C?
No - LM4040B25IDBZRG4 is characterized for the industrial temperature range of –40°C to +85°C only. For operation up to +125°C, TI offers the LM4040B25QDBZR (Q-grade), which uses the same DBZ package but is tested and warranted across –40°C to +125°C.
What is the long-term stability of LM4040B25IDBZRG4 after 1000 hours?
The LM4040B25IDBZRG4 exhibits 120ppm long-term stability after 1000 hours of operation at 25°C with 100μA cathode current, as documented in Sections 6.5–6.10 of the datasheet. This metric reflects voltage drift due to silicon aging and is independent of temperature cycling or initial tolerance.
LM4040B25IDBZRG4 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:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040B25IDBZRG4 FAQ
1.How can I place an order for LM4040B25IDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B25IDBZRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of LM4040B25IDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B25IDBZRG4 is usually 5 days.
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Once your LM4040B25IDBZRG4 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 LM4040B25IDBZRG4?
For technical support, including LM4040B25IDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B25IDBZRG4 requirements.
6.How does Aetrix verify that LM4040B25IDBZRG4 is sourced from the original manufacturer or authorized distributors?
All LM4040B25IDBZRG4 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 LM4040B25IDBZRG4 meets industry standards.
7.What is the process for return or replacement of LM4040B25IDBZRG4?
All LM4040B25IDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B25IDBZRG4, 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 LM4040B25IDBZRG4 part is unused and in its original packaging.
Return procedure for LM4040B25IDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040B25IDBZRG4 Tags
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