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Texas Instruments LM4140BCM-2.5
- Part No.:
- LM4140BCM-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140BCM-2.5.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,953
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Product details
Overview
LM4140BCM-2.5 from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 2.5 V output with ±0.1% initial accuracy, 3 ppm/°C temperature coefficient (A grade), and 20 mV typical dropout at 1 mA. It features an enable pin for power management and supports precision analog signal chains in battery-powered instrumentation and data acquisition systems.
For engineers reviewing the LM4140BCM-2.5 datasheet, LM4140BCM-2.5 pinout, LM4140BCM-2.5 application, or LM4140BCM-2.5 equivalent, key selection criteria include initial accuracy, ultra-low 1/f noise (2.2 µVPP), shutdown current ≤1 µA, 8-pin SOIC package compatibility, and verified stability with 1-µF output capacitance.
Technical Context
The LM4140BCM-2.5 uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling 3 ppm/°C drift performance without laser trimming. Its P-channel pass transistor architecture supports operation down to VIN = VREF + 20 mV (typical) at 1 mA load.
It operates across 0°C to 70°C, requires mandatory 1-µF output capacitor for loop stability, and delivers 8 mA output drive capability while maintaining 230 µA typical supply current in active mode and ≤1 µA in disable mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.1% initial accuracy - enables direct interface with 12-bit ADCs without calibration. |
| Tempco (A Grade) | 3 ppm/°C - ensures ≤525 µV drift over 0°C–70°C ambient range. |
| Dropout Voltage | 20 mV (typ) at 1 mA - allows operation from 2.52 V supply in low-voltage systems. |
| Output Noise | 2.2 µVPP (0.1–10 Hz) - critical for high-resolution weigh scales and precision DAC references. |
| Supply Current | 230 µA (typ), ≤1 µA in disable - extends battery life in portable multimeters and handheld test gear. |
| Enable Logic | Active-high, VIH ≥ 0.8×VIN - compatible with 1.8 V–5.5 V logic interfaces without level shifters. |
| Output Drive | ±8 mA - sufficient to drive ADC reference inputs and op-amp buffers directly. |
Pinout & Package
LM4140BCM-2.5 is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm) with exposed pad not present. Ground pins are internally bonded but externally accessible at four locations for optimal PCB grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Ground return path; all must be connected to system ground plane for thermal and noise performance. |
| 2 | VIN | Positive input supply; minimum 2.52 V required for regulation at full load. |
| 3 | Enable | Active-high digital control; tie to VIN if always-on; must not float. |
| 5 | NC | No-connect; leave unconnected per TI specification. |
| 6 | VREF | 2.5 V precision output; requires 1-µF ceramic/tantalum capacitor to GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM/DAC trimming | Enables 3 ppm/°C tempco and 0.1% initial accuracy without laser trimming-reducing manufacturing cost and lot-to-lot variation. |
| Ultra-low 1/f noise | 2.2 µVPP (0.1–10 Hz) supports 16+ ENOB in precision data converters without external filtering. |
| Low dropout operation | 20 mV dropout at 1 mA allows use with single-cell Li-ion (3.0 V min) or two-cell alkaline supplies. |
| Enable-controlled shutdown | Reduces supply current to ≤1 µA, enabling micro-power sleep modes in portable instrumentation. |
| Robust output drive | ±8 mA sourcing/sinking capability eliminates need for external buffer op-amps in most 12–16 bit ADC reference designs. |
Applications
| Portable Instrumentation | Precision Data Acquisition |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 16-bit SAR ADC during battery operation. IC Role / Device Role / Timing Role: Primary voltage reference source for ADC conversion and internal calibration circuitry. Use Value: 0.1% initial accuracy and 3 ppm/°C drift ensure <0.02% total error over operating temperature without recalibration. | Use Scenario: Industrial PLC analog input module digitizing 4–20 mA sensor signals with 14-bit resolution. IC Role / Device Role / Timing Role: Precision reference for programmable gain instrumentation amplifier and successive approximation ADC. Use Value: 2.2 µVPP low-frequency noise prevents degradation of effective resolution below 14 bits. |
| Medical Sensor Interfaces | Battery Management Systems |
Use Scenario: Portable ECG monitor measuring microvolt-level biopotentials with high common-mode rejection. IC Role / Device Role / Timing Role: Reference for low-noise instrumentation amplifier and anti-aliasing filter stages. Use Value: Ultra-low 1/f noise preserves signal integrity in DC-coupled front-end paths critical for ST-segment analysis. | Use Scenario: Lithium-ion battery fuel gauge IC requiring accurate 2.5 V reference for cell voltage measurement. IC Role / Device Role / Timing Role: Stable reference for 12-bit delta-sigma ADC measuring cell voltage under varying load and temperature. Use Value: 20 mV dropout enables direct connection to battery pack (≥2.52 V), eliminating LDO overhead and improving efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5025IDR | 2.5 V, 0.05% initial accuracy, 3 ppm/°C, 3.6 V min VIN, no enable pin | Lacks enable functionality; higher accuracy but requires higher supply voltage | Select when absolute highest initial accuracy is prioritized over power-down capability and low-VIN operation |
| ADR4525BRZ | 2.5 V, 0.02% initial accuracy, 2 ppm/°C, 3.0 V min VIN, no enable pin | Superior tempco and accuracy but no enable; SOIC-8 footprint differs (exposed pad) | Choose for metrology-grade stability where enable control and 2.52 V operation are not required |
Compared with REF5025IDR and ADR4525BRZ, LM4140BCM-2.5 uniquely combines enable control, 2.52 V minimum input, and 0.1% accuracy in standard SOIC-8-making it optimal for space-constrained, battery-operated systems needing dynamic power management.
Availability
LM4140BCM-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, and medical sensor interfaces requiring stable component supply, long-term calibration retention, and low-power shutdown capability.
Supply support for LM4140BCM-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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and personal electronics reach.
The LM4140 product line delivers high-accuracy, low-drift voltage references for precision measurement and control systems-designed specifically for applications demanding sub-0.1% initial tolerance and ultra-low 1/f noise in compact packages.
FAQ
What is the minimum input voltage required for LM4140BCM-2.5 to regulate at full load?
The LM4140BCM-2.5 requires a minimum input voltage of VREF + 20 mV (2.52 V) at 1 mA load, per datasheet Section 6.5. This ultra-low dropout enables operation from single-cell lithium batteries or low-voltage rails. At 8 mA load, dropout increases to 235 mV (max), requiring VIN ≥ 2.735 V for guaranteed regulation across temperature.
Does LM4140BCM-2.5 require an output capacitor, and what type is recommended?
Yes, LM4140BCM-2.5 requires a 1-µF output capacitor for loop stability and transient response, as specified in Section 8.1.2. Tantalum (e.g., Kemet T491A105M010AS) or multilayer ceramic capacitors meeting ESR requirements (Figure 23) are recommended. Aluminum electrolytics are discouraged below 0°C due to ESR rise.
How does the enable pin function on LM4140BCM-2.5, and what happens during shutdown?
The enable pin on LM4140BCM-2.5 is active-high: driving it ≥0.8×VIN turns the reference on; pulling it ≤0.4 V disables output and reduces supply current to ≤1 µA. During shutdown, internal circuitry actively discharges the output capacitor to ground within 200 µs, ensuring fast, controlled turnoff without external components.
What is the output noise specification for LM4140BCM-2.5, and how does it scale with voltage?
LM4140BCM-2.5 has 2.2 µVPP (0.1–10 Hz) output noise, linearly proportional to VREF per Section 6.5 footnote (7). Since this is the 2.5 V variant, its noise matches the 1.024 V option scaled by 2.5/1.024 ≈ 2.44×, confirming the 2.2 µVPP value. This makes it suitable for 16-bit+ data converters without additional filtering.
Is LM4140BCM-2.5 pin-compatible with other members of the LM4140 family?
Yes, all LM4140 variants-including LM4140BCM-1.024, LM4140BCM-2.5, and LM4140BCM-4.096-share identical 8-pin SOIC packaging and pinout. Only the output voltage and associated electrical characteristics (e.g., dropout, supply current) differ. No PCB redesign is needed when selecting between voltage options.
LM4140BCM-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 8 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 6ppm/°C
- Noise - 0.1Hz to 10Hz:
- 2.2µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 1.8V ~ 5.5V
- Current - Supply:
- 375µA
- Current - Cathode:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM4140BCM-2.5 FAQ
1.How can I place an order for LM4140BCM-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140BCM-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 LM4140BCM-2.5 reliable?
The price and inventory of LM4140BCM-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 LM4140BCM-2.5 is usually 5 days.
3.What payment methods are accepted for LM4140BCM-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140BCM-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140BCM-2.5?
LM4140BCM-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140BCM-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 LM4140BCM-2.5?
For technical support, including LM4140BCM-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140BCM-2.5 requirements.
6.How does Aetrix verify that LM4140BCM-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4140BCM-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 LM4140BCM-2.5 meets industry standards.
7.What is the process for return or replacement of LM4140BCM-2.5?
All LM4140BCM-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4140BCM-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 LM4140BCM-2.5 part is unused and in its original packaging.
Return procedure for LM4140BCM-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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