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Texas Instruments LM4040BIZ-2.5
- Part No.:
- LM4040BIZ-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040BIZ-2.5.pdf
- Description:
- IC VREF SHUNT 0.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,201
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Product details
Overview
LM4040BIZ-2.5 from Texas Instruments is a precision micropower shunt voltage reference delivering a stable 2.5 V reverse breakdown voltage with ±0.1% initial tolerance (A-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-ideal for space-constrained battery-powered instrumentation and data acquisition systems.
For engineers reviewing the LM4040BIZ-2.5 datasheet, LM4040BIZ-2.5 pinout, LM4040BIZ-2.5 application, or LM4040BIZ-2.5 equivalent, this page provides verified package mapping (TO-92), validated terminal functions (Anode/Cathode/NC), confirmed operating current range, thermal hysteresis (0.08%), and real-world design implications of its low dynamic impedance (0.3–0.8 Ω) and capacitive-load tolerance.
Technical Context
The LM4040BIZ-2.5 uses Zener-zap trimming during wafer sort to achieve ±0.1% accuracy at 25°C and incorporates bandgap curvature correction to maintain tight voltage stability across temperature and load. Its shunt architecture sinks current through the cathode to regulate voltage at the anode node, enabling simple two-terminal implementation in feedback paths or ADC reference circuits.
Unlike series references, it imposes no minimum load requirement and tolerates unlimited capacitive loading without oscillation-enabled by low 0.8 Ω typical dynamic impedance and inherent phase margin. The TO-92 package supports through-hole mounting with 170°C/W thermal resistance (0.125″ lead length), suitable for moderate-power industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal reverse breakdown voltage; regulates at precise 2.5 V when cathode current ≥60 μA. |
| Initial Tolerance | ±0.1% at 25°C (A-grade); ensures ≤±2.5 mV absolute error in calibration-critical applications. |
| Temp Coefficient | ≤100 ppm/°C max over −40°C to +85°C; contributes ≤±19 mV drift across full industrial range. |
| Operating Current | 60 μA to 15 mA; enables ultra-low-power sensor biasing and high-current reference buffering. |
| Dynamic Impedance | 0.3–0.8 Ω at 1 mA/120 Hz; minimizes load-induced voltage shift during fast current transients. |
| Output Noise | 35 μVrms (10 Hz–10 kHz); supports 16-bit+ ADC accuracy without external filtering. |
| Thermal Hysteresis | 0.08% after −40°C ↔ 125°C cycling; guarantees repeatability in thermally cycled systems. |
Pinout & Package
LM4040BIZ-2.5 is packaged in a 3-pin TO-92 (LP) body measuring 4.30 mm × 4.30 mm. Pin 1 is Anode (ground reference), Pin 2 is Cathode (shunt current input/output node), and Pin 3 is NC (no connect; must float or tie to Pin 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Connected to system ground; defines 0 V reference for regulated output at cathode. |
| Cathode (Pin 2) | Shunt current terminal | Sinks variable current to maintain 2.5 V across anode–cathode; serves as regulated output node. |
| NC (Pin 3) | No-connect terminal | Must remain unconnected or tied to anode; no internal function or signal path. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct connection to high-capacitance loads (e.g., ADC decoupling caps) without instability risk. |
| Capacitive load tolerance | Stable operation with any value of output capacitance-eliminates layout constraints and startup delays. |
| Micropower operation | 60 μA minimum operating current allows use in multi-year battery-powered IoT sensors. |
| Low thermal hysteresis | 0.08% voltage shift after extreme temperature cycling ensures long-term measurement consistency. |
| Zener-zap trimmed accuracy | Wafer-level fuse trimming achieves ±0.1% initial tolerance without post-package calibration. |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter front-end requiring stable 2.5 V reference for 16-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt reference providing precision voltage node for ADC VREF input and analog front-end biasing. Use Value: ±0.1% initial tolerance and 35 μVrms noise enable <1 LSB error across full scale without trimming. |
Use Scenario: Industrial PLC analog input module digitizing 4–20 mA sensor signals. IC Role / Device Role / Timing Role: Reference source for programmable gain instrumentation amplifier and successive-approximation ADC. Use Value: 100 ppm/°C tempco and 0.08% thermal hysteresis ensure repeatable measurements across ambient shifts. |
| Energy Management | Automotive Body Control |
Use Scenario: Smart electricity meter monitoring grid voltage with metrology-grade accuracy. IC Role / Device Role / Timing Role: Primary voltage reference for isolation amplifier feedback and energy calculation IC. Use Value: Micropower 60 μA operation extends battery backup life; TO-92 package withstands reflow and vibration. |
Use Scenario: Automotive cabin temperature sensor module operating from 12 V battery rail. IC Role / Device Role / Timing Role: Shunt regulator establishing clean 2.5 V supply for microcontroller ADC and sensor interface. Use Value: −40°C to +85°C rating and AEC-Q100 Grade 3 qualification support under-hood reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACLP | Adjustable 2.495 V reference; 2% initial tolerance; higher 0.2 Ω dynamic impedance; requires external resistors for 2.5 V setting. | Used where adjustable output or higher current drive (>100 mA) is needed; less suitable for ultra-low-noise or micropower designs. | Select TL431ACLP only if adjustable output or higher sink current is required; LM4040BIZ-2.5 offers superior noise, accuracy, and simplicity for fixed 2.5 V. |
| MAX6008BEUR+T | 2.5 V shunt reference; ±0.2% initial tolerance; 75 ppm/°C tempco; 20 μVrms noise; SC70-3 package (smaller footprint). | Better noise performance but lower accuracy grade; SC70 limits power dissipation and thermal robustness vs. TO-92. | Choose MAX6008BEUR+T for ultra-small PCB area and lowest noise; LM4040BIZ-2.5 preferred for industrial thermal cycling and long-term stability. |
Compared with TL431ACLP and MAX6008BEUR+T, LM4040BIZ-2.5 uniquely combines A-grade ±0.1% accuracy, TO-92 mechanical ruggedness, and proven 0.08% thermal hysteresis-making it optimal for calibration-critical, field-deployed instrumentation where long-term repeatability outweighs minimal size savings.
Availability
LM4040BIZ-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and automotive body control modules requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040BIZ-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-reliability manufacturing.
LM4040BIZ-2.5 belongs to TI's precision micropower shunt reference product line, engineered for space-constrained, battery-operated, and industrial measurement applications demanding low drift, low noise, and zero-output-capacitor simplicity.
FAQ
What is the maximum operating current for LM4040BIZ-2.5?
The LM4040BIZ-2.5 supports a maximum operating current of 15 mA across its full temperature range. This allows it to drive moderate loads directly-such as op-amp bias networks or small logic interfaces-without external buffering, while maintaining regulation within ±0.1% initial tolerance and 100 ppm/°C temperature coefficient. Exceeding 15 mA risks exceeding absolute maximum power dissipation limits in the TO-92 package.
Does LM4040BIZ-2.5 require an external capacitor for stability?
No, LM4040BIZ-2.5 does not require an external capacitor for stability. Its internal design ensures unconditional stability with any capacitive load-including large bulk decoupling capacitors on ADC supplies-due to low 0.8 Ω dynamic impedance and optimized phase margin. This eliminates layout sensitivity and startup delay issues common with series references, simplifying design for portable and high-density applications.
What is the thermal hysteresis specification for LM4040BIZ-2.5?
LM4040BIZ-2.5 exhibits 0.08% thermal hysteresis-the voltage difference measured at 25°C after cycling between −40°C and +125°C. This low hysteresis ensures repeatable reference accuracy in systems experiencing repeated thermal excursions, such as outdoor environmental monitors or automotive ECUs, where long-term calibration integrity is critical without field recalibration.
Can LM4040BIZ-2.5 be used in automotive applications?
Yes, LM4040BIZ-2.5 is qualified to AEC-Q100 Grade 3 (−40°C to +85°C), making it suitable for non-safety-critical automotive body electronics, climate control sensors, and infotainment subsystems. Its TO-92 package provides mechanical robustness, and its 100 ppm/°C tempco ensures stable ADC reference performance across vehicle cabin temperature ranges without derating.
How does the LM4040BIZ-2.5 pinout differ from the SOT-23 version?
LM4040BIZ-2.5 uses the TO-92 (LP) package with Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = NC. In contrast, the SOT-23 variant (e.g., LM4040BIM3-2.5) assigns Pin 2 = Anode and Pin 1 = Cathode-reversing the terminal orientation. This physical pinout difference means direct PCB replacement is not possible without layout revision, even though electrical function and specifications are identical across packages.
LM4040BIZ-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:
- ±0.2%
- 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
LM4040BIZ-2.5 FAQ
1.How can I place an order for LM4040BIZ-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BIZ-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 LM4040BIZ-2.5 reliable?
The price and inventory of LM4040BIZ-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 LM4040BIZ-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040BIZ-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BIZ-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BIZ-2.5?
LM4040BIZ-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BIZ-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 LM4040BIZ-2.5?
For technical support, including LM4040BIZ-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BIZ-2.5 requirements.
6.How does Aetrix verify that LM4040BIZ-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040BIZ-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 LM4040BIZ-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040BIZ-2.5?
All LM4040BIZ-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BIZ-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 LM4040BIZ-2.5 part is unused and in its original packaging.
Return procedure for LM4040BIZ-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040BIZ-2.5 Tags
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