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Texas Instruments LM4040CIZ-2.5
- Part No.:
- LM4040CIZ-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040CIZ-2.5.pdf
- Description:
- IC VREF SHUNT 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,854
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Product details
Overview
LM4040CIZ-2.5 from Texas Instruments is a precision micropower shunt voltage reference with 2.5 V nominal reverse breakdown voltage, ±0.5% initial tolerance at 25°C, 100 ppm/°C max temperature coefficient, 60 μA to 15 mA operating current range, and TO-92 package-used for accurate voltage calibration in portable data acquisition and battery-powered instrumentation.
For engineers reviewing the LM4040CIZ-2.5 datasheet, LM4040CIZ-2.5 pinout, LM4040CIZ-2.5 application, or LM4040CIZ-2.5 equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and noise performance, and real-world implementation context for low-power analog reference design.
Technical Context
The LM4040CIZ-2.5 operates as a two-terminal shunt reference, sinking current through its cathode to maintain a stable 2.5 V across its anode–cathode terminals. It uses Zener-zap trimming and bandgap curvature correction to achieve ±0.5% initial accuracy and 100 ppm/°C max drift over −40°C to +85°C industrial temperature range.
No external capacitor is required for stability, and it tolerates capacitive loads up to 10 nF. Its 0.9 Ω typical dynamic impedance (at 1 mA) and 35 μVrms wideband noise (10 Hz–10 kHz) support high-resolution ADC biasing and precision sensor excitation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage, calibrated at 100 μA test current |
| Initial Tolerance | ±0.5% at 25°C (C-grade), enabling 12-bit system-level accuracy without trimming |
| Temp Coefficient | ≤100 ppm/°C over −40°C to +85°C, limiting drift to ±19 mV across full range |
| Operating Current | 60 μA minimum to 15 mA maximum-supports ultra-low-power sleep modes and high-current DAC references |
| Dynamic Impedance | 0.9 Ω typical at 1 mA, ensuring <1 mV load regulation error under 1 mA step changes |
| Output Noise | 35 μVrms (10 Hz–10 kHz), suitable for 16-bit SAR ADC reference buffers |
| Long-Term Stability | 120 ppm after 1000 hours, critical for uncalibrated field-deployed instrumentation |
Pinout & Package
LM4040CIZ-2.5 is housed in a 3-pin TO-92 plastic package (body size 4.30 mm × 4.30 mm), with leads arranged bottom-view: Pin 1 = Anode (grounded), Pin 2 = Cathode (shunt current input/output node), Pin 3 = NC (no connect, must float or tie to Pin 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Internally connected to substrate; must be tied to system ground for stable operation |
| Cathode (Pin 2) | Shunt current terminal | Sinks all operating current; output voltage develops between Cathode and Anode |
| NC (Pin 3) | No-connect terminal | Electrically isolated; floating or shorted to Anode per TI recommendation |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables space-constrained PCB layouts without stability-compromising external components |
| Tolerates capacitive loads | Stable with up to 10 nF load capacitance-simplifies filtering for noisy supply rails |
| Micropower operation | 60 μA minimum current enables >10-year battery life in coin-cell–powered sensors |
| Zener-zap trimmed accuracy | Fuse-based wafer-sort trimming ensures C-grade ±0.5% match without post-package calibration |
| Low thermal hysteresis | 0.08% hysteresis after −40°C/125°C cycling preserves calibration integrity in thermal-cycling environments |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld multimeter measuring DC voltage with 16-bit resolution. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V reference for SAR ADC and analog front-end gain stages. Use Value: ±0.5% initial tolerance and 35 μVrms noise enable sub-LSB error without calibration firmware. |
Use Scenario: Wireless environmental sensor node logging temperature/humidity with 12-bit ADC. IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference rail and sensor excitation current source. Use Value: 60 μA min operating current extends CR2032 battery life beyond 5 years in low-duty-cycle operation. |
| Process Control Transmitters | Energy Management Monitors |
Use Scenario: 4–20 mA loop-powered pressure transmitter in industrial plant. IC Role / Device Role / Timing Role: Two-terminal shunt reference establishing precise 2.5 V for signal conditioning and microcontroller VREF. Use Value: 100 ppm/°C tempco and −40°C to +85°C rating ensure ≤±1 LSB drift across ambient temperature swings. |
Use Scenario: Smart electricity meter measuring RMS voltage/current with isolation amplifiers. IC Role / Device Role / Timing Role: Stable reference for metrology-grade ADCs and anti-aliasing filter biasing. Use Value: Low 0.9 Ω dynamic impedance minimizes reference droop during high-speed sampling bursts. |
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, 75 ppm/°C max tempco, 65 μA min current | Smaller footprint; higher min current limits use in ultra-low-IQ designs | Select when board space is constrained and thermal drift budget allows tighter 75 ppm/°C spec |
| MAX6008AEUR+T | 2.5 V, ±0.2%, SOT-23-3, 75 ppm/°C, 35 μA min current, 20 μVrms noise | Higher initial accuracy and lower noise, but requires 35 μA min-less suitable for <60 μA systems | Prefer for high-accuracy, low-noise applications where supply current margin exists |
Compared with LM4040CIZ-2.5, TL4050C25IDBZR offers smaller SOT-23 packaging and slightly better temperature stability but demands higher minimum current; MAX6008AEUR+T delivers superior accuracy and noise performance at the cost of reduced micropower capability-making LM4040CIZ-2.5 optimal for TO-92-restricted, ultra-low-IQ, and cost-sensitive industrial instrumentation.
Availability
LM4040CIZ-2.5 is available at Aetrix Electronics and suitable for portable data acquisition, battery-powered instrumentation, and process control transmitters requiring stable component supply with long-term calibration integrity and industrial temperature support.
Supply support for LM4040CIZ-2.5 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 reliability.
The LM4040-N series was engineered for space-constrained, low-power analog systems requiring factory-trimmed voltage accuracy without external compensation-targeting instrumentation, energy metering, and automotive subsystems.
FAQ
What is the pin configuration of the LM4040CIZ-2.5?
The LM4040CIZ-2.5 uses a 3-pin TO-92 package with bottom-view orientation: Pin 1 is Anode (ground), Pin 2 is Cathode (shunt current terminal), and Pin 3 is NC (no connect, must float or tie to Pin 1). This configuration is confirmed in TI's SNOS633K datasheet Figure 4 and Pin Functions table.
Does the LM4040CIZ-2.5 require an external capacitor for stability?
No, the LM4040CIZ-2.5 does not require an external capacitor for stability. Its internal design ensures unconditional stability even with capacitive loads up to 10 nF, as stated in the Features section and Application Information (Section 9.1) of the LM4040-N datasheet.
What is the maximum operating temperature range for the LM4040CIZ-2.5?
The LM4040CIZ-2.5 is rated for the industrial temperature range of −40°C to +85°C. It is not qualified for extended range (−40°C to +125°C); that specification applies only to specific LM4040-N-Q1 automotive variants or E-grade versions in SOT-23 packages.
How does the LM4040CIZ-2.5 achieve its ±0.5% initial accuracy?
The LM4040CIZ-2.5 achieves ±0.5% initial accuracy via fuse and Zener-zap trimming during wafer sort, as documented in Section 3 (Description) of the SNOS633K datasheet. This factory-trimmed process ensures C-grade tolerance without requiring post-package calibration or external adjustment.
Can the LM4040CIZ-2.5 be used in battery-powered applications with very low quiescent current?
Yes-the LM4040CIZ-2.5 supports operation down to 60 μA, making it suitable for multi-year battery life in coin-cell–powered devices. Its micropower design, combined with no required output capacitor, reduces both current draw and board area-key for portable instrumentation using the LM4040CIZ-2.5.
LM4040CIZ-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM4040CIZ-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIZ-2.5 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 reliable?
The price and inventory of LM4040CIZ-2.5 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 is usually 5 days.
3.What payment methods are accepted for LM4040CIZ-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIZ-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIZ-2.5?
LM4040CIZ-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIZ-2.5 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?
For technical support, including LM4040CIZ-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIZ-2.5 requirements.
6.How does Aetrix verify that LM4040CIZ-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040CIZ-2.5 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 meets industry standards.
7.What is the process for return or replacement of LM4040CIZ-2.5?
All LM4040CIZ-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIZ-2.5, 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 part is unused and in its original packaging.
Return procedure for LM4040CIZ-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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