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Texas Instruments LM4040CIZ-2.5/LFT8
- Part No.:
- LM4040CIZ-2.5/LFT8
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040CIZ-2.5/LFT8.pdf
- Description:
- IC VREF SHUNT 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,606
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Product details
Overview
LM4040CIZ-2.5/LFT8 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 for ADC/DAC biasing, sensor excitation, and field transmitter calibration.
For engineers reviewing the LM4040CIZ-2.5/LFT8 datasheet, LM4040CIZ-2.5/LFT8 pinout, LM4040CIZ-2.5/LFT8 application, or LM4040CIZ-2.5/LFT8 equivalent, key selection criteria include industrial-grade temperature range, low dynamic impedance (0.9 Ω typ), capacitive-load stability, thermal hysteresis (0.08%), and AEC-Q100 Grade 3 qualification for automotive subsystems.
Technical Context
The LM4040CIZ-2.5/LFT8 implements a Zener-zap trimmed bandgap-assisted shunt reference architecture with curvature-corrected temperature drift compensation. Its fuse-based wafer-sort trimming ensures ±12 mV (±0.5%) initial accuracy at 25°C and maintains stability across 60 μA–15 mA operating current.
It features inherently low dynamic impedance (0.9 Ω typical at 1 mA), enabling high PSRR and minimal load regulation error (<0.8 mV over 60 μA–1 mA), while tolerating unlimited capacitive loads without oscillation - eliminating need for external stabilization components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage; fixed value enables direct replacement of 2.5 V references without resistor networks. |
| Initial Tolerance | ±12 mV (±0.5%) at 25°C; supports mid-accuracy analog signal chains where 12-bit ADC/DAC reference stability is required. |
| Temp Coefficient | ≤100 ppm/°C max over −40°C to +85°C; ensures ≤±1.3 mV drift across full industrial range, critical for field transmitters. |
| Operating Current | 60 μA min / 15 mA max; ultra-low minimum current allows battery-powered sensor nodes to maintain regulation during sleep modes. |
| Noise (10 Hz–10 kHz) | 35 μVrms; low enough to avoid degrading ENOB in 14-bit data acquisition systems without additional filtering. |
| Dynamic Impedance | 0.9 Ω typical at 1 mA; minimizes output voltage shift under varying load currents, improving line/load regulation in analog front-ends. |
| Thermal Hysteresis | 0.08% (≈2 mV); guarantees repeatable voltage after thermal cycling - essential for recalibration-free industrial instrumentation. |
Pinout & Package
LM4040CIZ-2.5/LFT8 uses a 3-pin TO-92 package (body size 4.30 mm × 4.30 mm) with axial leads. Pin 1 is Cathode (shunt current input/output node), Pin 2 is Anode (ground reference), and Pin 3 is NC (no connect, must float or tie to Anode per TI recommendation for EMI immunity).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current path / output voltage node | Connected to supply rail via series resistor; regulates voltage by sinking variable current to ground through Anode. |
| Anode (Pin 2) | Reference ground terminal | Must be connected to system ground; defines 0 V reference for 2.5 V output at Cathode relative to this node. |
| NC (Pin 3) | No-connect terminal | Internally unconnected; TI recommends floating or tying to Anode in noisy environments to reduce EMI susceptibility. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Enables space-constrained PCB layouts (e.g., 4–20 mA loop transmitters) without stability-compensation components. |
| Tolerates capacitive loads | Stable with >100 nF output capacitance - simplifies filtering for noise-sensitive applications like precision sensor interfaces. |
| Zener-zap wafer-trimmed accuracy | Guarantees ±0.5% initial tolerance without post-package calibration, reducing test time and BOM cost. |
| AEC-Q100 Grade 3 qualified | Validated for automotive subsystems operating from −40°C to +85°C, including body control modules and HVAC sensors. |
| Low 35 μVrms noise | Preserves SNR in high-resolution data acquisition paths without requiring low-noise op-amp buffering stages. |
Applications
| Field Transmitter Calibration | Data Acquisition Reference |
|---|---|
Use Scenario: 4–20 mA loop-powered pressure/temperature transmitter requiring stable excitation and ADC reference. IC Role / Device Role / Timing Role: Shunt reference providing 2.5 V bias for bridge sensor and 2.5 V reference for 16-bit SAR ADC. Use Value: ±0.5% tolerance and 100 ppm/°C TC ensure <0.1% full-scale error over industrial temperature range without recalibration. | Use Scenario: Modular analog input card digitizing ±10 V industrial signals with 14-bit resolution. IC Role / Device Role / Timing Role: Precision reference for dual-slope or sigma-delta ADC, decoupled from noisy digital supply rails. Use Value: 35 μVrms noise and 0.9 Ω dynamic impedance prevent reference-induced quantization noise and load-induced gain error. |
| Automotive Sensor Interface | Analog Input Module |
Use Scenario: Cabin air quality sensor module in vehicle HVAC system with AEC-Q100 compliance requirement. IC Role / Device Role / Timing Role: Voltage reference for MEMS gas sensor signal conditioning and microcontroller ADC. Use Value: AEC-Q100 Grade 3 qualification and −40°C to +85°C operation guarantee reliability in under-hood and cabin environments. | Use Scenario: DIN-rail mounted programmable logic controller (PLC) analog input channel with isolated 0–10 V inputs. IC Role / Device Role / Timing Role: Local shunt reference on isolated analog side, referenced to isolated ground for ADC and op-amp biasing. Use Value: No-output-capacitor design simplifies isolation barrier layout; TO-92 package allows manual rework and through-hole mounting for serviceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040CIM3-2.5 | SOT-23 package (2.92 mm × 1.30 mm); same 2.5 V, ±0.5%, 100 ppm/°C, but higher thermal resistance (291.9°C/W vs TO-92's 166°C/W). | Better suited for space-constrained surface-mount designs; less suitable for high-power dissipation or manual assembly. | Select LM4040CIM3-2.5 when board area is limited and thermal management uses copper pour; retain LM4040CIZ-2.5/LFT8 for through-hole reliability or legacy TO-92 footprints. |
| MAX6008BESA25+ | 2.5 V, ±0.2% initial accuracy, 75 ppm/°C max TC, SC70-3 package; lower noise (20 μVrms) but narrower current range (100 μA–10 mA). | Higher accuracy and lower noise benefit metrology-grade instruments; reduced max current limits use in high-side sensing. | Choose MAX6008BESA25+ for lab-grade DAQ requiring <0.2% error budget; LM4040CIZ-2.5/LFT8 remains optimal for cost-sensitive industrial field devices with 15 mA headroom. |
Compared with LM4040CIM3-2.5 and MAX6008BESA25+, the LM4040CIZ-2.5/LFT8 offers superior thermal performance in TO-92, wider operating current headroom (15 mA), and AEC-Q100 qualification - making it the preferred choice for ruggedized, through-hole, automotive-qualified, or high-reliability industrial analog signal chains.
Availability
LM4040CIZ-2.5/LFT8 is available at Aetrix Electronics and suitable for field transmitters, data acquisition systems, and automotive sensor interfaces requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM4040CIZ-2.5/LFT8 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 power management ICs, with decades of expertise in precision reference design.
The LM4040-N product line delivers micropower shunt voltage references optimized for space-constrained, low-current, high-stability applications across industrial, automotive, and instrumentation markets.
FAQ
What is the maximum operating current for LM4040CIZ-2.5/LFT8?
The LM4040CIZ-2.5/LFT8 supports a maximum operating current of 15 mA, verified per TI's Electrical Characteristics table 5.3. This headroom allows robust operation under transient load conditions and accommodates higher-current buffer stages without compromising regulation. Exceeding 15 mA risks exceeding absolute maximum ratings and may cause thermal shutdown or permanent damage to the LM4040CIZ-2.5/LFT8.
Does LM4040CIZ-2.5/LFT8 require an external capacitor for stability?
No, the LM4040CIZ-2.5/LFT8 does not require an external output capacitor due to its internally compensated design. TI explicitly states "no output capacitor required" in the Features section and confirms stability with any capacitive load. This eliminates risk of oscillation and reduces bill-of-materials cost - a key advantage of the LM4040CIZ-2.5/LFT8 over older shunt references.
What is the temperature range specification for LM4040CIZ-2.5/LFT8?
The LM4040CIZ-2.5/LFT8 is rated for the industrial temperature range of −40°C to +85°C (Grade I), as confirmed in Section 5.3 and Table 5.9 of the datasheet. It is also AEC-Q100 Grade 3 qualified, meaning it meets automotive stress testing requirements within that same temperature span - making LM4040CIZ-2.5/LFT8 suitable for both industrial and automotive under-hood/cabin applications.
How does the pin configuration of LM4040CIZ-2.5/LFT8 differ from SOT-23 versions?
The LM4040CIZ-2.5/LFT8 uses a TO-92 package with Cathode on Pin 1, Anode on Pin 2, and NC on Pin 3 - unlike the SOT-23 version (e.g., LM4040CIM3-2.5) which places Cathode on Pin 1, Anode on Pin 2, and NC on Pin 3 but in a surface-mount footprint. The pin functions are identical, but physical layout, thermal resistance (166°C/W vs 291.9°C/W), and assembly method differ - critical when migrating from LM4040CIZ-2.5/LFT8 to SMT variants.
Is LM4040CIZ-2.5/LFT8 qualified for automotive applications?
Yes, the LM4040CIZ-2.5/LFT8 is AEC-Q100 Grade 3 qualified, as stated in the Features section and confirmed in Section 5.8 (Electrical Characteristics for AEC Grade 3). This qualification covers stress testing for temperature cycling, humidity, and mechanical shock - validating LM4040CIZ-2.5/LFT8 for non-safety-critical automotive subsystems such as climate control, body electronics, and infotainment sensor interfaces.
LM4040CIZ-2.5/LFT8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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/LFT8 FAQ
1.How can I place an order for LM4040CIZ-2.5/LFT8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040CIZ-2.5/LFT8 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/LFT8 reliable?
The price and inventory of LM4040CIZ-2.5/LFT8 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/LFT8 is usually 5 days.
3.What payment methods are accepted for LM4040CIZ-2.5/LFT8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040CIZ-2.5/LFT8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040CIZ-2.5/LFT8?
LM4040CIZ-2.5/LFT8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040CIZ-2.5/LFT8 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/LFT8?
For technical support, including LM4040CIZ-2.5/LFT8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040CIZ-2.5/LFT8 requirements.
6.How does Aetrix verify that LM4040CIZ-2.5/LFT8 is sourced from the original manufacturer or authorized distributors?
All LM4040CIZ-2.5/LFT8 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/LFT8 meets industry standards.
7.What is the process for return or replacement of LM4040CIZ-2.5/LFT8?
All LM4040CIZ-2.5/LFT8 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040CIZ-2.5/LFT8, 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/LFT8 part is unused and in its original packaging.
Return procedure for LM4040CIZ-2.5/LFT8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040CIZ-2.5/LFT8 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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