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Texas Instruments LM4040C25IDBZTG4
- Part No.:
- LM4040C25IDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C25IDBZTG4.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,824
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Product details
Overview
LM4040C25IDBZTG4 from Texas Instruments is a precision 2.5V shunt voltage reference in SOT-23-3 (DBZ) package, rated for industrial temperature range (–40°C to +85°C), with ±0.5% initial accuracy, 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation down to 45μA cathode current. It serves as a compact, low-power voltage reference in analog-to-digital converters and sensor signal conditioning circuits.
For engineers reviewing the LM4040C25IDBZTG4 datasheet, LM4040C25IDBZTG4 pinout, LM4040C25IDBZTG4 application, or LM4040C25IDBZTG4 equivalent, key selection criteria include output tolerance at 25°C, thermal stability over –40°C to +85°C, minimum operating current, dynamic impedance, and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040C25IDBZTG4 uses Zener-zap trimming during wafer sort to achieve its C-grade (±0.5%) initial accuracy. Its two-terminal shunt architecture requires no external capacitors and remains stable across all capacitive loads, simplifying layout in space-constrained systems.
It delivers low dynamic impedance (0.9Ω typical at 1mA), tight thermal hysteresis (0.08%), and long-term stability of 120ppm after 1000 hours - enabling high-accuracy voltage scaling in portable and industrial measurement front-ends where supply headroom is limited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal at IZ = 100μA, 25°C - sets precise bias point for ADC references and sensor excitation. |
| Initial Accuracy | ±0.5% max at 25°C - ensures ≤±12.5mV absolute error before temperature or aging effects. |
| Temp Coefficient | 100ppm/°C max - contributes ≤±6.5mV drift over –40°C to +85°C ambient range. |
| Min Cathode Current | 45μA typical - enables ultra-low-power operation in battery-powered data loggers. |
| Dynamic Impedance | 0.9Ω typical at 1mA - maintains regulation under fast load transients in precision DAC buffers. |
| Wideband Noise | 35μVRMS (10Hz–10kHz) - minimizes added noise in high-resolution (≥16-bit) measurement systems. |
| Thermal Hysteresis | 0.08% - limits repeatability error after thermal cycling 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/voltage input | Connects to regulated node; sinks current to maintain 2.5V across anode–cathode. |
| Anode (Pin 2) | Common reference node | Typically tied to system ground; forms return path for cathode current. |
| NC (Pin 3) | No internal connection | Must float or be connected to anode per TI EMI guidance; not used for regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - reduces BOM count and PCB area in compact designs. |
| Low 35μVRMS noise | Preserves SNR in 16-bit+ data-acquisition systems without requiring additional filtering. |
| 45μA min operating current | Enables direct use with microcontroller GPIOs or low-quiescent-current LDOs in energy-harvesting nodes. |
| 100ppm/°C tempco | Meets industrial-grade accuracy requirements without external calibration over full temperature range. |
| 0.08% thermal hysteresis | Ensures repeatable voltage setting after environmental stress testing or field thermal cycling. |
Applications
| Data-Acquisition Systems | Analog Input Module |
|---|---|
Use Scenario: High-resolution ADC reference in portable multimeters and handheld test equipment. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for SAR ADC conversion, directly determining full-scale accuracy. Use Value: ±0.5% initial tolerance and 100ppm/°C tempco ensure <±0.1% total error over operating temperature without software correction. | Use Scenario: Signal conditioning stage in PLC analog input cards accepting 4–20mA or ±10V field signals. IC Role / Device Role / Timing Role: Supplies precision bias voltage to op-amp gain stages and ADC reference inputs. Use Value: Low 35μVRMS noise prevents degradation of effective resolution in 16-bit delta-sigma converters. |
| Field Transmitters | Energy Infrastructure |
Use Scenario: Two-wire loop-powered pressure/temperature transmitter with integrated signal processing. IC Role / Device Role / Timing Role: References the DAC output that sets loop current; also biases sensor interface circuitry. Use Value: 45μA minimum cathode current allows operation from microamp-level loop budgets while maintaining regulation. | Use Scenario: Voltage monitoring in smart metering ICs and grid-edge power quality analyzers. IC Role / Device Role / Timing Role: Serves as reference for isolated voltage sensing and fault detection comparators. Use Value: 0.08% thermal hysteresis ensures consistent trip thresholds across repeated thermal cycles in outdoor enclosures. |
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, ±0.5% accuracy, but higher 75μA min cathode current and 50μVRMS noise. | Less suitable for sub-50μA ultra-low-power designs; requires larger headroom for regulation. | Prefer LM4040C25IDBZTG4 when minimizing quiescent current is critical. |
| REF3025AIDBZR | Series reference (not shunt); 2.5V, ±0.2% accuracy, 50μA IQ, but requires input voltage ≥2.7V and external bypass cap. | Not drop-in compatible - needs redesign for series topology, higher supply voltage, and decoupling. | Select REF3025AIDBZR only if system has sufficient headroom and demands tighter initial accuracy. |
Compared with TL4050C25IDBZR and REF3025AIDBZR, the LM4040C25IDBZTG4 uniquely balances ultra-low operating current (45μA), low noise (35μVRMS), and shunt simplicity - making it optimal for space- and power-constrained industrial sensors and portable DAQ where minimal external components are required.
Availability
LM4040C25IDBZTG4 is available at Aetrix Electronics and suitable for data-acquisition systems, analog input modules, field transmitters, and energy infrastructure applications requiring stable component supply, long-term calibration integrity, and industrial-temperature reliability.
Supply support for LM4040C25IDBZTG4 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 specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision analog ICs.
The LM4040 series was designed specifically for cost-sensitive, space-constrained applications needing stable, low-power voltage references - especially in industrial sensing, portable instrumentation, and automotive subsystems.
FAQ
What is the maximum cathode current rating for LM4040C25IDBZTG4?
The absolute maximum cathode current for LM4040C25IDBZTG4 is 25mA, as specified in the Absolute Maximum Ratings table. Continuous operation above this level risks permanent damage. For reliable long-term performance, TI recommends limiting cathode current to ≤15mA under normal operating conditions, where dynamic impedance and thermal rise remain well-controlled.
Does LM4040C25IDBZTG4 require an output capacitor for stability?
No, LM4040C25IDBZTG4 does not require an output capacitor. Its two-terminal shunt architecture is inherently stable with all capacitive loads, including large bulk capacitance on the reference node. This eliminates the need for external compensation components and simplifies PCB layout in compact designs.
What is the thermal hysteresis specification for LM4040C25IDBZTG4?
The thermal hysteresis of LM4040C25IDBZTG4 is 0.08%, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to +125°C. This low hysteresis ensures repeatable reference voltage behavior in applications subject to repeated thermal cycling, such as outdoor industrial sensors and automotive ECUs.
Can LM4040C25IDBZTG4 operate at temperatures beyond +85°C?
No - LM4040C25IDBZTG4 is characterized for the industrial temperature range of –40°C to +85°C. For extended temperature operation up to +125°C, TI offers the LM4040C25Q variant (e.g., LM4040C25QDBZRG4). Using LM4040C25IDBZTG4 above +85°C may result in unguaranteed accuracy, increased drift, or accelerated aging.
How does the 100ppm/°C temperature coefficient impact accuracy over the full operating range?
Over the –40°C to +85°C range (ΔT = 125°C), the 100ppm/°C coefficient contributes up to ±12.5mV (0.5% of 2.5V) of additional error beyond the ±12.5mV initial tolerance. Combined with initial error, the total worst-case deviation is ±25mV (±1.0%) - matching TI's published overtemperature tolerance for the C grade.
LM4040C25IDBZTG4 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:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- 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:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C25IDBZTG4 FAQ
1.How can I place an order for LM4040C25IDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C25IDBZTG4 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 LM4040C25IDBZTG4 reliable?
The price and inventory of LM4040C25IDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25IDBZTG4 is usually 5 days.
3.What payment methods are accepted for LM4040C25IDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C25IDBZTG4 transactions.
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4.How is shipping managed for LM4040C25IDBZTG4?
LM4040C25IDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C25IDBZTG4 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 LM4040C25IDBZTG4?
For technical support, including LM4040C25IDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25IDBZTG4 requirements.
6.How does Aetrix verify that LM4040C25IDBZTG4 is sourced from the original manufacturer or authorized distributors?
All LM4040C25IDBZTG4 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 LM4040C25IDBZTG4 meets industry standards.
7.What is the process for return or replacement of LM4040C25IDBZTG4?
All LM4040C25IDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25IDBZTG4, 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 LM4040C25IDBZTG4 part is unused and in its original packaging.
Return procedure for LM4040C25IDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C25IDBZTG4 Tags
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TL431AIDBZR
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TL431BQDBZR
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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