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Texas Instruments LM4040BIM3-2.5
- Part No.:
- LM4040BIM3-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040BIM3-2.5.pdf
- Description:
- LM4040-N 100-PPM/C PRECISION MIC
- Quantity:
- Payment:
- Shipping:
Inventory:39,977
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Product details
Overview
LM4040BIM3-2.5 from Texas Instruments (formerly National Semiconductor) is a precision micropower shunt voltage reference in SOT-23 package, delivering a stable 2.500 V reverse breakdown voltage with ±0.2% initial tolerance at 25°C, 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, making it ideal for space-constrained battery-powered instrumentation.
For engineers reviewing the LM4040BIM3-2.5 datasheet, LM4040BIM3-2.5 pinout, LM4040BIM3-2.5 application, or LM4040BIM3-2.5 equivalent, key selection considerations include its fixed 2.5 V output, B-grade accuracy, SOT-23 thermal performance, low-noise stability under capacitive loads, and compatibility with precision ADC/DAC biasing and portable energy management circuits.
Technical Context
The LM4040BIM3-2.5 uses zener-zap trimming during wafer sort to achieve ±0.2% initial voltage accuracy. Its bandgap-based temperature drift curvature correction ensures stable output across industrial temperature range without external compensation.
It functions as a two-terminal shunt device: cathode connects to regulated voltage node, anode to ground; dynamic impedance is 0.8 Ω at 1 mA, enabling high PSRR and low sensitivity to supply ripple in feedback configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V nominal at 100 μA - precise reference for 12-bit+ SAR ADCs and DACs |
| Initial Tolerance | ±0.2% max at 25°C - enables single-point calibration in production test |
| Temp Coefficient | 100 ppm/°C max - supports <±2 mV drift over −40°C to +85°C |
| Operating Current | 60 μA to 15 mA - ultra-low quiescent current for coin-cell operation |
| Output Noise | 35 μVrms (10 Hz–10 kHz) - minimal contribution to system noise floor |
| Dynamic Impedance | 0.8 Ω max at 1 mA - maintains regulation under fast load transients |
| Long-Term Stability | 120 ppm after 1000 hrs - predictable aging behavior for field-reliable designs |
Pinout & Package
SOT-23 package (JEDEC TO-236AB, NS package MF03A), 3-pin surface-mount with 1.3 mm × 2.9 mm footprint and 1.0 mm height. Cathode (pin 1) and anode (pin 2) are functional terminals; pin 3 is NC (no connection) and must be left floating or tied to pin 2 per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Regulated Output Node | Connected to voltage node requiring stable 2.5 V reference; sinks current into device |
| Pin 2 (Anode) | Ground Reference | Return path for shunt current; must be low-impedance ground for accuracy |
| Pin 3 (NC) | No Connection | Internally unconnected; floating or tied to pin 2 per layout guidance |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with any capacitive load up to 10 μF - eliminates BOM cost and board area for decoupling |
| Fixed 2.5 V output | Matches standard ADC full-scale ranges and microcontroller VREF inputs without resistor dividers |
| Micropower operation | 60 μA minimum operating current - extends battery life in IoT sensors and handheld meters |
| Low thermal hysteresis | 0.08% - minimal voltage shift after thermal cycling, critical for lab-grade instrumentation |
| Wide current range | 60 μA–15 mA - accommodates both ultra-low-power sleep modes and active signal conditioning |
Applications
| Portable, Battery-Powered Equipment | Data Acquisition Systems |
|---|---|
Use Scenario: Coin-cell-powered environmental sensor node measuring temperature/humidity with 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V VREF to ADC and analog front-end op-amps. Use Value: Enables 14.5 ENOB at 1 kSPS while drawing <100 μA total system current. | Use Scenario: 4-channel industrial DAQ module with simultaneous sampling and isolated analog inputs. IC Role / Device Role / Timing Role: Primary reference for multiplexed SAR ADC and calibration circuitry. Use Value: Delivers <±1 LSB error over temperature due to 100 ppm/°C TC and low long-term drift. |
| Instrumentation | Energy Management |
Use Scenario: Benchtop multimeter requiring 0.1% DC voltage measurement accuracy. IC Role / Device Role / Timing Role: Precision shunt reference for autoranging input attenuators and offset calibration. Use Value: Supports 5½-digit resolution via ±0.2% initial tolerance and 0.08% thermal hysteresis. | Use Scenario: Smart electricity meter with metrology-grade AFE and tamper detection. IC Role / Device Role / Timing Role: Stable reference for polyphase energy measurement IC and anti-tamper comparators. Use Value: Maintains Class 0.2 accuracy over 10-year field life with 120 ppm long-term stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | Adjustable 2.495 V output (min 2.5 V with external resistors); higher 2 mA min current; 200 ppm/°C TC | Requires external resistors for 2.5 V; less suitable for ultra-low-power systems | Select when adjustable output or higher current capability is needed; not drop-in for LM4040BIM3-2.5 |
| MAX6002EUR+T | 2.5 V fixed output; ±0.2% tolerance; 75 ppm/°C TC; SC70-3 package; 50 μA min current | Lower min current and better TC, but limited to 10 mA max current and different pinout | Prefer for ultra-low-current designs where 10 mA compliance limit is sufficient |
Compared with TL431CDBZR and MAX6002EUR+T, the LM4040BIM3-2.5 offers superior current flexibility (60 μA–15 mA), proven long-term stability (120 ppm), and SOT-23 compatibility with legacy layouts-making it optimal for cost-sensitive, high-volume instrumentation and portable power monitoring.
Availability
LM4040BIM3-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and energy metering applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for LM4040BIM3-2.5 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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for the LM4040 family.
The LM4040 product line delivers precision shunt references optimized for space-constrained, low-power systems where stability, low noise, and zero-output-capacitor operation are critical design requirements.
FAQ
What is the maximum operating current for LM4040BIM3-2.5?
The LM4040BIM3-2.5 supports a maximum operating current of 15 mA. This upper limit ensures safe power dissipation within the SOT-23 package's 306 mW rating at 25°C ambient. Exceeding 15 mA risks thermal overload and parameter degradation; design margin should maintain ≤12 mA continuous operation for reliability across temperature extremes.
Does LM4040BIM3-2.5 require an external capacitor for stability?
No, the LM4040BIM3-2.5 does not require an external output capacitor. Its internal design ensures stability with any capacitive load-including 10 μF ceramic or tantalum-eliminating the need for additional components. This simplifies layout, reduces BOM count, and avoids potential oscillation issues common in traditional shunt references.
What is the temperature coefficient specification for LM4040BIM3-2.5?
The LM4040BIM3-2.5 has a maximum average temperature coefficient of 100 ppm/°C over the industrial range (−40°C to +85°C). This value is measured at 1 mA operating current and guarantees total output drift of ≤±2.0 mV across the full temperature span-critical for maintaining accuracy in unregulated environments like outdoor sensors or factory-floor equipment.
Can LM4040BIM3-2.5 be used in extended temperature applications up to +125°C?
The LM4040BIM3-2.5 is rated for the industrial temperature range (−40°C to +85°C) only. For operation up to +125°C, TI offers the LM4040CEM3-2.5 (C grade, ±0.5%) or LM4040DEM3-2.5 (D grade, ±1.0%) in the same SOT-23 package-both qualified for extended temperature range but with relaxed initial tolerance and TC specs compared to the B-grade LM4040BIM3-2.5.
How is the LM4040BIM3-2.5 marked on the SOT-23 package?
The LM4040BIM3-2.5 carries a three-character top-side marking: "2B" (where "2" denotes 2.500 V output and "B" indicates ±0.2% initial tolerance). This matches National Semiconductor's SOT-23 marking convention per datasheet section "SOT-23 AND SC70 Package Marking Information", and is laser-etched for traceability and authenticity verification.
LM4040BIM3-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- ±0.2%
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040BIM3-2.5 FAQ
1.How can I place an order for LM4040BIM3-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BIM3-2.5 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 LM4040BIM3-2.5 reliable?
The price and inventory of LM4040BIM3-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BIM3-2.5 is usually 5 days.
3.What payment methods are accepted for LM4040BIM3-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BIM3-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BIM3-2.5?
LM4040BIM3-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BIM3-2.5 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 LM4040BIM3-2.5?
For technical support, including LM4040BIM3-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BIM3-2.5 requirements.
6.How does Aetrix verify that LM4040BIM3-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4040BIM3-2.5 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 LM4040BIM3-2.5 meets industry standards.
7.What is the process for return or replacement of LM4040BIM3-2.5?
All LM4040BIM3-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BIM3-2.5, 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 LM4040BIM3-2.5 part is unused and in its original packaging.
Return procedure for LM4040BIM3-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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