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Texas Instruments LM4040C25IDBZRG4
- Part No.:
- LM4040C25IDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C25IDBZRG4.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,683
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Product details
Overview
LM4040C25IDBZRG4 from Texas Instruments is a precision micropower shunt voltage reference with 2.5V nominal output, ±12mV (0.5%) initial tolerance at 25°C, 100ppm/°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 data-acquisition systems.
For engineers reviewing the LM4040C25IDBZRG4 datasheet, LM4040C25IDBZRG4 pinout, LM4040C25IDBZRG4 application, or LM4040C25IDBZRG4 equivalent, key selection criteria include its C-grade accuracy over –40°C to 85°C, SOT-23-3 (DBZ) package compatibility, low dynamic impedance (0.9Ω typical), and absence of required output capacitance.
Technical Context
The LM4040C25IDBZRG4 operates as a two-terminal shunt reference, sinking cathode current (IZ) to regulate voltage across its terminals. Its Zener-based architecture uses wafer-level fuse and Zener-zap trimming to achieve 0.5% initial accuracy, with thermal hysteresis limited to 0.08% over –40°C to 125°C cycling.
It maintains stable regulation under all capacitive loads without external compensation, supported by low 0.9Ω dynamic impedance at 1mA and 35μVRMS noise in 10Hz–10kHz bandwidth. The device draws only 45μA minimum cathode current, enabling use in battery-powered instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal at IZ = 100μA, 25°C - precise setpoint for ADC/DAC biasing and sensor excitation |
| Initial Tolerance | ±12mV (0.5%) at 25°C - defines absolute voltage error before temperature or load effects |
| Temp Coefficient | 100ppm/°C max - contributes ≤±260μV/°C drift over industrial range (–40°C to 85°C) |
| Noise (10Hz–10kHz) | 35μVRMS typical - low enough for 16-bit+ SAR ADC reference without filtering |
| Cathode Current Range | 45μA to 15mA - supports ultra-low-power sensing and high-current buffer drive |
| Dynamic Impedance | 0.9Ω typical at 1mA - ensures <1mV output shift per 1mA load transients |
| Thermal Hysteresis | 0.08% - limits repeatability error after temperature cycling between –40°C and 125°C |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92mm × 1.30mm footprint, surface-mount, thermally efficient with RθJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current/voltage input | Connects to supply rail; sinks regulated current to maintain 2.5V across anode–cathode |
| Anode (Pin 2) | Common reference node | Typically grounded; forms reference return path and sets output voltage relative to system ground |
| NC (Pin 3) | No internal connection | Must float or tie to anode in high-EMI environments to reduce noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates reliably with any capacitive load - eliminates BOM cost and layout sensitivity |
| Micropower operation | 45μA minimum cathode current - enables multi-year battery life in portable sensors |
| Low noise performance | 35μVRMS (10Hz–10kHz) - supports high-resolution measurement without post-regulation filtering |
| Wide current range | 45μA to 15mA regulation - accommodates both ultra-low-power monitoring and active buffer driving |
| Extended temp grade | Specified over –40°C to 85°C - suitable for industrial control cabinets and automotive under-hood modules |
Applications
| Analog Input Module | Data-Acquisition System |
|---|---|
Use Scenario: Precision voltage scaling for 16-bit SAR ADC front-end in PLC analog I/O cards. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5V reference for ADC VREF input and sensor signal conditioning. Use Value: 0.5% initial tolerance and 100ppm/°C drift ensure <±0.05% full-scale error over temperature without calibration. |
Use Scenario: Portable handheld multimeter requiring accurate DC voltage measurement across 200mV–1000V ranges. IC Role / Device Role / Timing Role: Primary reference for autoranging attenuator and ADC, enabling consistent gain calibration. Use Value: 35μVRMS noise and 0.9Ω dynamic impedance prevent measurement uncertainty from reference instability during sampling. |
| Field Transmitter | Energy Infrastructure |
Use Scenario: 4–20mA loop-powered temperature transmitter in oil & gas remote monitoring. IC Role / Device Role / Timing Role: Low-current shunt reference powering signal conditioning circuitry within strict 3.5mA loop budget. Use Value: 45μA minimum cathode current allows reliable startup and regulation even at lowest loop current. |
Use Scenario: Smart electricity meter measuring voltage and current with metrology-grade accuracy. IC Role / Device Role / Timing Role: Reference for isolated voltage sensing channel and anti-aliasing filter biasing. Use Value: Thermal hysteresis of 0.08% prevents calibration drift after repeated thermal cycling 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% tolerance, SOT-23-3 package; higher 50ppm/°C tempco (vs. 100ppm/°C), 20μVRMS noise | Better noise and tempco, but lower max cathode current (10mA vs. 15mA); not qualified for extended temp | Select when lower noise and tighter drift are critical, and operating temperature stays ≤85°C |
| MAX6008BCR25+T | 2.5V, 0.5% tolerance, SC70-3 package; 75ppm/°C tempco, 20μVRMS noise, 10μA min cathode current | Lower quiescent current enables nano-power designs; smaller SC70 footprint but lower power dissipation rating | Select for space-constrained, ultra-low-power applications where 10μA startup suffices and thermal margin is limited |
Compared with TL4050C25IDBZR and MAX6008BCR25+T, the LM4040C25IDBZRG4 offers higher cathode current headroom (15mA) and guaranteed operation to 85°C with robust ESD ratings (±2kV HBM), making it preferred for industrial field equipment with transient-rich power rails.
Availability
LM4040C25IDBZRG4 is available at Aetrix Electronics and suitable for analog input modules, portable data-acquisition systems, and field transmitters requiring stable component supply with traceable lot history and long-term lifecycle support.
Supply support for LM4040C25IDBZRG4 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 and embedded processing technologies, with decades of expertise in precision reference design and high-volume manufacturing.
The LM4040 series was developed to deliver cost-effective, space-efficient shunt references for industrial and portable instrumentation, emphasizing micropower operation, capacitor-free stability, and wide current regulation range.
FAQ
What is the operating temperature range for LM4040C25IDBZRG4?
The LM4040C25IDBZRG4 is characterized for operation from –40°C to +85°C ambient temperature. This industrial-grade range is confirmed in Section 4 (Device Comparison Table) and Section 6.9 (Electrical Characteristics) of the TI datasheet SLOS456Q, where all C-grade I-temperature variants are explicitly specified across this interval.
Does LM4040C25IDBZRG4 require an output capacitor?
No, the LM4040C25IDBZRG4 is stable with all capacitive loads and requires no output capacitor for regulation. This is explicitly stated in the Features section ("Stable with all capacitive loads; no output capacitor required") and validated in the Detailed Description (Section 7.3), making it ideal for space-constrained and low-BOM-cost designs.
What is the minimum cathode current needed for regulation in LM4040C25IDBZRG4?
The LM4040C25IDBZRG4 requires a minimum cathode current of 45μA (typical) at 25°C to maintain regulation, rising to 80μA across the full –40°C to 85°C range. This value is documented in Table 6.9 under "IZ,min" and enables reliable startup in ultra-low-power sensor nodes.
How does the pin configuration of LM4040C25IDBZRG4 differ from other LM4040 variants?
The LM4040C25IDBZRG4 uses the DBZ (SOT-23-3) package with Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC. This matches the DBZ pinout shown in Figure 5-1 and Table 5-1 of the datasheet - distinct from DCK (SC70-5) and LP (TO-92) variants which have different pin counts and assignments.
What is the long-term stability specification for LM4040C25IDBZRG4?
The LM4040C25IDBZRG4 exhibits 120ppm long-term stability after 1000 hours of operation at 25°C with 100μA cathode current, as specified in Tables 6.5–6.10. This parameter reflects voltage drift due to aging and supports calibration intervals in metrology-grade equipment.
LM4040C25IDBZRG4 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
LM4040C25IDBZRG4 FAQ
1.How can I place an order for LM4040C25IDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C25IDBZRG4 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 LM4040C25IDBZRG4 reliable?
The price and inventory of LM4040C25IDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25IDBZRG4 is usually 5 days.
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LM4040C25IDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C25IDBZRG4 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 LM4040C25IDBZRG4?
For technical support, including LM4040C25IDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25IDBZRG4 requirements.
6.How does Aetrix verify that LM4040C25IDBZRG4 is sourced from the original manufacturer or authorized distributors?
All LM4040C25IDBZRG4 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 LM4040C25IDBZRG4 meets industry standards.
7.What is the process for return or replacement of LM4040C25IDBZRG4?
All LM4040C25IDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25IDBZRG4, 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 LM4040C25IDBZRG4 part is unused and in its original packaging.
Return procedure for LM4040C25IDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C25IDBZRG4 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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