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Texas Instruments LM4140ACM-2.5/NOPB
- Part No.:
- LM4140ACM-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM4140ACM-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:302
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Product details
Overview
LM4140ACM-2.5/NOPB 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 load. It features an enable pin for power management and supports portable instrumentation, precision DACs, and battery-powered data acquisition systems.
For engineers reviewing the LM4140ACM-2.5/NOPB datasheet, LM4140ACM-2.5/NOPB pinout, LM4140ACM-2.5/NOPB application, or LM4140ACM-2.5/NOPB equivalent, key selection criteria include initial accuracy, thermal drift, enable-controlled shutdown (<1 µA), ultra-low 2.2 µVPP (0.1–10 Hz) noise, and SOIC-8 compatibility with 1-µF output capacitor requirement.
Technical Context
The LM4140ACM-2.5/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling sub-bandgap 2.5 V output with 3 ppm/°C drift over 0°C to 70°C. Its P-channel pass transistor architecture supports operation down to VIN = VREF + 20 mV (typical) at 1 mA.
It integrates internal discharge circuitry that actively sinks charge from the output capacitor during disable, ensuring rapid turnoff and eliminating external bleed resistors. The enable input accepts logic-level control (VH ≥ 0.8×VIN, VL ≤ 0.4 V) and must not float-requiring tie-to-VIN if unused.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±0.1% (initial accuracy at 25°C; A-grade specification) |
| Tempco | 3 ppm/°C (max over 0°C to 70°C; enables <±50 ppm total drift in industrial ambient) |
| Dropout Voltage | 20 mV (typical 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 16-bit+ ADC/DAC reference stability) |
| Supply Current | 230 µA (typical active; ≤1 µA in shutdown-extends battery life in sleep-mode devices) |
| Enable Threshold | VIL ≤ 0.4 V, VIH ≥ 0.8×VIN (supports direct interfacing with 3.3 V or 5 V GPIO without level shifters) |
| Output Drive | ±8 mA (sinks/source capability enables direct driving of op-amp inputs or small loads) |
Pinout & Package
LM4140ACM-2.5/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not electrically connected. Pin functions are validated per TI SNVS053F Rev F datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 8 | GND | Four dedicated ground terminals reduce impedance and improve PSRR/noise rejection; all must be connected to system ground plane. |
| 2 | VIN | Positive supply input; requires ≥2.52 V for regulation; accepts up to 5.5 V max. |
| 3 | Enable | Digital control input; pull low to disable output and reduce current to ≤1 µA; tie to VIN for always-on operation. |
| 5 | NC | No-connect pin; must remain unconnected and unbonded on PCB. |
| 6 | VREF | Regulated 2.5 V output; requires 1 µF ceramic/tantalum capacitor to GND for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM + DAC trimming | Enables 3 ppm/°C tempco and 0.1% initial accuracy without laser trimming-reducing unit cost and improving batch consistency. |
| Active output discharge | Internally discharges COUT during disable-eliminates need for external bleeder resistor and prevents voltage hold-up in power sequencing. |
| Low dropout (20 mV) | Permits use with single-cell Li-ion (3.0 V min) or coin-cell (3 V) supplies while maintaining regulation at full 8 mA load. |
| Ultra-low 0.1–10 Hz noise | 2.2 µVPP supports high-resolution delta-sigma ADCs (e.g., ADS12xx) without added filtering or post-regulation. |
| 1 µF output capacitor | Standardized, low-cost 1 µF MLCC or tantalum satisfies stability requirements-simplifies BOM and layout vs. legacy references needing >10 µF. |
Applications
| Portable Instrumentation | Precision DAC Reference |
|---|---|
Use Scenario: Handheld multimeter or portable DMM requiring stable 2.5 V reference across 0–50°C ambient. IC Role / Device Role / Timing Role: Primary voltage reference for 24-bit sigma-delta ADC front-end, directly setting full-scale range. Use Value: 3 ppm/°C drift ensures <±150 ppm error over operating range-equivalent to <0.004% FS error in 24-bit measurement. | Use Scenario: Industrial PLC analog output module generating 0–10 V or 4–20 mA signals via 16-bit DAC. IC Role / Device Role / Timing Role: Precision reference for DAC VREF input; enables monotonicity and INL <±1 LSB over temperature. Use Value: 2.2 µVPP noise prevents dithering in quiet codes; 0.1% initial accuracy eliminates factory calibration step. |
| Battery-Powered DAQ | Medical Sensor Interface |
Use Scenario: Wearable ECG monitor using coin-cell battery and low-power SAR ADC. IC Role / Device Role / Timing Role: Reference for signal-chain PGA and ADC; enabled only during sampling bursts to minimize quiescent current. Use Value: ≤1 µA shutdown current extends battery life; 20 mV dropout allows operation down to 2.52 V-capturing >95% of battery capacity. | Use Scenario: Portable pulse oximeter requiring stable excitation voltage for red/IR LED drivers. IC Role / Device Role / Timing Role: Reference for precision current sources driving LEDs; rejects supply ripple from switching regulators. Use Value: 119.3 °C/W θJA and 4-GND-pin layout minimize self-heating-induced drift-critical for <0.1% SpO2 accuracy. |
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 µVPP noise, 0.95 mA supply current | Higher accuracy/noise performance but 4× higher quiescent current; no enable pin | Select for metrology-grade accuracy where power is secondary; avoid in battery-constrained designs. |
| ADR4525BRZ | 2.5 V, 0.02% initial accuracy, 2 ppm/°C, 1.75 µVPP noise, 950 µA supply current, no enable | Superior drift and noise specs, but fixed 5 V min input and no shutdown mode | Choose when ultimate stability is required and supply >5 V is available; not suitable for low-voltage or intermittent-use systems. |
Compared with REF5025IDR and ADR4525BRZ, the LM4140ACM-2.5/NOPB uniquely balances 0.1% accuracy, 3 ppm/°C drift, ultra-low 230 µA operating current, and integrated enable-making it optimal for portable, intermittently powered precision systems where supply headroom is limited.
Availability
LM4140ACM-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision DAC reference circuits, and battery-powered data acquisition systems requiring stable component supply, long-term parametric consistency, and RoHS-compliant packaging.
Supply support for LM4140ACM-2.5/NOPB 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, designing and manufacturing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and consumer markets.
The LM4140 product line delivers high-accuracy, low-drift voltage references using EEPROM-based DAC trimming-targeting portable, battery-operated, and precision measurement applications demanding sub-ppm/°C stability and microamp-level quiescent current.
FAQ
What is the minimum input voltage required for LM4140ACM-2.5/NOPB to regulate at full load?
The LM4140ACM-2.5/NOPB requires VIN ≥ VREF + 20 mV (typical) at 1 mA load, or ≥2.52 V. At 8 mA, dropout rises to 235 mV (max), so VIN ≥ 2.735 V is needed for full-load regulation across temperature. This low dropout enables use with single-cell Li-ion or 3 V coin cells.
Does LM4140ACM-2.5/NOPB require an output capacitor, and what type is recommended?
Yes-LM4140ACM-2.5/NOPB requires a 1 µF output capacitor for loop stability and transient response. TI validates solid tantalum (e.g., Kemet T491A105M010AS) and multilayer ceramic capacitors (e.g., Murata GRM42-6Y5V225Z16). Avoid aluminum electrolytics below 0°C due to ESR rise.
How does the enable pin function on LM4140ACM-2.5/NOPB, and what happens to the output during disable?
The enable pin (Pin 3) turns LM4140ACM-2.5/NOPB on when pulled ≥0.8×VIN and off when ≤0.4 V. During disable, LM4140ACM-2.5/NOPB actively discharges the output capacitor to ground via internal circuitry-ensuring rapid, controlled turnoff without external components.
What is the output noise specification for LM4140ACM-2.5/NOPB, and how does it scale with voltage?
LM4140ACM-2.5/NOPB delivers 2.2 µVPP (0.1–10 Hz) noise. Per datasheet Note (7), output noise is linearly proportional to VREF-so the 2.5 V version exhibits 2.2 µVPP, while the 4.096 V option would show ~3.6 µVPP. This scaling enables predictable noise budgeting across the LM4140 family.
Can LM4140ACM-2.5/NOPB drive 8 mA continuously, and what is its short-circuit current limit?
Yes-LM4140ACM-2.5/NOPB is specified to source/sink up to ±8 mA continuously. Its short-circuit current is 8.5–35 mA (typ–max at 25°C), providing inherent protection against brief overloads without external current limiting. Sustained short-circuit operation is not recommended due to thermal stress.
LM4140ACM-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 8 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 3ppm/°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
LM4140ACM-2.5/NOPB FAQ
1.How can I place an order for LM4140ACM-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4140ACM-2.5/NOPB 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 LM4140ACM-2.5/NOPB reliable?
The price and inventory of LM4140ACM-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4140ACM-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4140ACM-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4140ACM-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4140ACM-2.5/NOPB?
LM4140ACM-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4140ACM-2.5/NOPB 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 LM4140ACM-2.5/NOPB?
For technical support, including LM4140ACM-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4140ACM-2.5/NOPB requirements.
6.How does Aetrix verify that LM4140ACM-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4140ACM-2.5/NOPB 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 LM4140ACM-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4140ACM-2.5/NOPB?
All LM4140ACM-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4140ACM-2.5/NOPB, 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 LM4140ACM-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4140ACM-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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