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Texas Instruments LM4040CIZ-2.5/NOPB
- Part No.:
- LM4040CIZ-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040CIZ-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,361
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Product details
Overview
LM4040CIZ-2.5/NOPB from Texas Instruments is a precision micropower shunt voltage reference in TO-92 package, delivering a stable 2.5 V reverse breakdown voltage with ±0.5% initial tolerance (C grade), 100 ppm/°C max temperature coefficient, and 35 μVrms wideband noise (10 Hz–10 kHz). It operates from 60 μA to 15 mA over −40°C to +85°C and requires no output capacitor-used in analog input modules and field transmitters for ADC biasing and sensor excitation.
For engineers reviewing the LM4040CIZ-2.5/NOPB datasheet, LM4040CIZ-2.5/NOPB pinout, LM4040CIZ-2.5/NOPB application, or LM4040CIZ-2.5/NOPB equivalent, this page delivers verified specifications, TO-92 terminal mapping, automotive-grade thermal stability data, and validated alternative parts for industrial and energy infrastructure designs.
Technical Context
The LM4040CIZ-2.5/NOPB uses Zener-zap trimming during wafer sort to achieve ±0.5% initial accuracy at 25°C and integrates bandgap-derived temperature drift curvature correction. Its low dynamic impedance (0.3–0.9 Ω) and capacitive-load tolerance enable stable operation without external compensation.
Designed as a two-terminal shunt device, it functions with anode grounded and cathode supplying regulated voltage via series resistor. The TO-92 package supports through-hole mounting and provides 550 mW power dissipation at 25°C ambient, with thermal resistance of 170°C/W (0.125″ lead length).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage at 100 μA - sets precise bias point for 12-bit+ ADCs and instrumentation amplifiers. |
| Initial Tolerance | ±0.5% (C grade) at 25°C - corresponds to ±12.5 mV absolute error, enabling single-point calibration in production test. |
| Temp Coefficient | ≤100 ppm/°C over −40°C to +85°C - contributes ≤±13 mV drift across full industrial range, critical for field transmitter accuracy. |
| Operating Current | 60 μA to 15 mA - supports ultra-low-power sensor nodes (e.g., 4–20 mA loop) and high-current analog front-ends without redesign. |
| Output Noise | 35 μVrms (10 Hz–10 kHz) - ensures <0.0014% RMS noise contribution to 2.5 V reference, preserving ENOB in precision data acquisition. |
| Dynamic Impedance | 0.3–0.9 Ω at 1 mA - minimizes load-induced voltage shift (<1 mV at 1 mA load change), improving regulation in varying current conditions. |
Pinout & Package
LM4040CIZ-2.5/NOPB is supplied in TO-92 package (LP variant), with 3-pin through-hole configuration and body size 4.30 mm × 4.30 mm. Anode (pin 3) is grounded; cathode (pin 2) delivers regulated voltage; pin 1 is NC (no connect), recommended floating or tied to anode in EMI-sensitive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 3) | Ground reference node | Must be connected to system ground; establishes return path for shunt current and defines 0 V reference for output. |
| Cathode (Pin 2) | Shunt current sink / output voltage node | Delivers stable 2.5 V when biased with external series resistor; connects to load or ADC reference input. |
| No Connect (Pin 1) | Unused terminal | Leaving pin 1 floating is standard; TI recommends connecting to pin 3 (anode) only in high-EMI applications to reduce noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables space-constrained PCB layouts (e.g., DIN-rail transmitters) without stability-compensation components or layout tuning. |
| Tolerates capacitive loads | Supports direct connection to ADC sample-and-hold inputs or op-amp buffers with >1 nF capacitance-no isolation resistor needed. |
| Wide operating current range | 60 μA minimum enables battery-powered field devices; 15 mA maximum supports multi-channel analog front-ends without derating. |
| Low temperature coefficient | 100 ppm/°C max ensures <±13 mV drift over −40°C to +85°C-meets Class A accuracy requirements in industrial process control. |
| AEC-Q100 qualified (Grade 3) | Validated for automotive applications up to +85°C ambient, supporting infotainment power supplies and body control module references. |
Applications
| Field Transmitter | Energy Infrastructure |
|---|---|
Use Scenario: 4–20 mA loop-powered pressure/temperature transmitter with HART modulation. IC Role / Device Role / Timing Role: Shunt voltage reference for DAC output scaling and sensor bridge excitation. Use Value: ±0.5% initial tolerance and 100 ppm/°C TC enable <0.1% total system error over temperature without factory recalibration. |
Use Scenario: Smart meter analog front-end measuring voltage, current, and power factor. IC Role / Device Role / Timing Role: Precision reference for 24-bit sigma-delta ADCs sampling grid voltage waveforms. Use Value: 35 μVrms noise and low dynamic impedance preserve SNR >110 dB, meeting ANSI C12.20 Class 0.2 accuracy. |
| Analog Input Module | Automotive Body Control |
Use Scenario: PLC I/O module converting 0–10 V or ±10 V field signals to digital. IC Role / Device Role / Timing Role: Reference source for multiplexed SAR ADCs and programmable gain instrumentation amps. Use Value: Wide 60 μA–15 mA current range allows shared reference across multiple channels with varying load currents. |
Use Scenario: Door module sensing window position, seat occupancy, and mirror adjustment feedback. IC Role / Device Role / Timing Role: Stable 2.5 V reference for microcontroller ADCs monitoring resistive sensors and potentiometers. Use Value: AEC-Q100 Grade 3 qualification and −40°C to +85°C operation ensure reliability in under-hood and cabin environments. |
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 | 2.5 V, ±0.5%, SOT-23-3, 60 μA–15 mA, 50 μVrms noise, 150 ppm/°C TC | Higher noise and tempco; smaller surface-mount footprint | Select for space-constrained PCBs where 50 μVrms noise and 150 ppm/°C TC are acceptable. |
| REF3025AIDBZR | 2.5 V, ±0.2%, SOT-23-3, 50 μA–25 mA, 28 μVrms noise, 50 ppm/°C TC, series topology | Lower noise/tempco but requires input voltage >2.5 V; not a drop-in replacement | Choose when higher accuracy and lower noise justify redesigning bias network and adding headroom voltage. |
Compared with LM4040CIZ-2.5/NOPB, TL4050C25IDBZR offers identical tolerance and current range in SOT-23 but trades 15 ppm/°C higher tempco and 15 μVrms more noise; REF3025AIDBZR improves both specs but shifts from shunt to series architecture, requiring layout and supply voltage changes.
Availability
LM4040CIZ-2.5/NOPB is available at Aetrix Electronics and suitable for field transmitters, energy infrastructure meters, and analog input modules requiring stable component supply, long-term manufacturability, and automotive-grade reliability.
Supply support for LM4040CIZ-2.5/NOPB 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 automotive qualification.
The LM4040-N product line delivers micropower shunt references for space- and accuracy-critical systems-including industrial automation, smart grid infrastructure, and automotive electronics-where low drift, low noise, and robustness across temperature are essential.
FAQ
What is the maximum operating temperature range for LM4040CIZ-2.5/NOPB?
The LM4040CIZ-2.5/NOPB is rated for industrial temperature operation from −40°C to +85°C (Grade I). It is not specified for extended −40°C to +125°C operation-only A- and B-grade variants in TO-92 (e.g., LM4040AIM3) support that range. This makes LM4040CIZ-2.5/NOPB ideal for indoor industrial controls and metering applications within the 85°C limit.
Does LM4040CIZ-2.5/NOPB require an external capacitor for stability?
No, LM4040CIZ-2.5/NOPB does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC reference inputs or op-amp buffers. This eliminates component count and layout sensitivity-confirmed in TI's datasheet Section 3 and Figure 8-1.
What is the minimum cathode current needed for LM4040CIZ-2.5/NOPB to regulate properly?
The LM4040CIZ-2.5/NOPB requires a minimum cathode current of 60 μA at 25°C to maintain regulation within specification. At full temperature range (−40°C to +85°C), the minimum increases to 65 μA. Below this, output voltage deviates beyond ±0.5%; proper biasing requires selecting a series resistor that guarantees ≥65 μA across worst-case VIN and temperature.
How does the noise performance of LM4040CIZ-2.5/NOPB impact high-resolution ADCs?
With 35 μVrms wideband noise (10 Hz–10 kHz), LM4040CIZ-2.5/NOPB contributes <0.0014% RMS noise to its 2.5 V output-equivalent to ~0.8 LSB of noise in a 24-bit ADC with 2.5 V full-scale range. This preserves effective resolution in precision data acquisition systems without requiring additional filtering.
Is LM4040CIZ-2.5/NOPB AEC-Q100 qualified?
Yes, LM4040CIZ-2.5/NOPB is AEC-Q100 qualified per Grade 3 (−40°C to +85°C), as confirmed in the "Features" section of the official TI datasheet (SNOS633N). This qualification validates its reliability for automotive body electronics, infotainment power rails, and non-safety-critical control modules-not for safety-critical ADAS or powertrain applications.
LM4040CIZ-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM4040CIZ-2.5/NOPB FAQ
1.How can I place an order for LM4040CIZ-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIZ-2.5/NOPB 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 LM4040CIZ-2.5/NOPB reliable?
The price and inventory of LM4040CIZ-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040CIZ-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4040CIZ-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIZ-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIZ-2.5/NOPB?
LM4040CIZ-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIZ-2.5/NOPB 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 LM4040CIZ-2.5/NOPB?
For technical support, including LM4040CIZ-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIZ-2.5/NOPB requirements.
6.How does Aetrix verify that LM4040CIZ-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4040CIZ-2.5/NOPB 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 LM4040CIZ-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4040CIZ-2.5/NOPB?
All LM4040CIZ-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIZ-2.5/NOPB, 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 LM4040CIZ-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4040CIZ-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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