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Texas Instruments LM4132CMF-1.8
- Part No.:
- LM4132CMF-1.8
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4132CMF-1.8.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,551
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Product details
Overview
LM4132CMF-1.8 from Texas Instruments is a precision low-dropout (LDO) series voltage reference IC delivering a stable 1.8 V output with ±0.2% initial accuracy (C grade), 20 ppm/°C temperature coefficient over –40°C to +125°C, 60 µA supply current, and 230 mV dropout at 10 mA load. It operates in SOT-23-5 package and serves as a high-stability reference for ADCs, DACs, and sensor signal chains in portable instrumentation.
For engineers reviewing the LM4132CMF-1.8 datasheet, LM4132CMF-1.8 pinout, LM4132CMF-1.8 application, or LM4132CMF-1.8 equivalent, key selection criteria include its enable-controlled shutdown (3 µA), compatibility with low-ESR ceramic capacitors, no requirement for output buffer, and automotive-grade qualification (AEC-Q100 Grade 1) - critical for battery-powered and industrial measurement systems.
Technical Context
The LM4132CMF-1.8 uses EEPROM-trimmed CMOS bandgap architecture to achieve laser-trimmed bipolar-level accuracy without laser trimming, correcting curvature, tempco, and initial offset at package level to mitigate assembly-induced shifts. Its internal LDO regulator topology enables precise 1.8 V output regulation independent of load current up to 20 mA.
It features an active-high enable pin (VIH = 65% VIN, VIL = 35% VIN), supports input voltages from (VREF + 400 mV) to 5.5 V, and maintains stability with only a required input capacitor (CIN); output capacitor (COUT) is optional. Thermal hysteresis is limited to 75 ppm after –40°C to +125°C cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.2% initial accuracy (C grade) - ensures ≤3.6 mV absolute error at 25°C for 12-bit+ data converters |
| Temperature Coefficient | 20 ppm/°C (–40°C to +125°C) - contributes ≤3.6 mV drift across full industrial range |
| Dropout Voltage | 230 mV at 10 mA load - allows operation from 2.03 V input, enabling single-cell LiFePO₄ or dual-cell alkaline supplies |
| Supply Current | 60 µA typical, ≤100 µA over temperature - minimizes quiescent power in always-on sensing nodes |
| Shutdown Current | 3 µA at EN = 0 V - extends battery life in intermittent-measurement applications |
| Load Regulation | 25 ppm/mA (0–20 mA) - holds output within ±0.5 mV under full load step, supporting dynamic analog front-ends |
| Long-Term Stability | 50 ppm over 1000 hours - guarantees <0.09 mV drift in 6-month field deployment |
Pinout & Package
SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, with exposed pad not connected internally. Pin 1 is NC (no connect), pin 2 is GND, pin 3 is EN (enable), pin 4 is VIN (input), and pin 5 is VREF (output).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No-connect terminal | Must be left floating; no internal connection - avoids unintended parasitic paths or ESD coupling |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference current and enable logic; requires low-impedance PCB connection to minimize noise injection |
| Pin 3 (EN) | Digital enable input | Active-high control: drives device into 3 µA shutdown when pulled low (<35% VIN); hysteresis prevents chatter near threshold |
| Pin 4 (VIN) | Unregulated input supply | Accepts 2.2 V to 5.5 V; must be bypassed with ≥1 µF low-ESR ceramic capacitor (CIN) placed adjacent to pin |
| Pin 5 (VREF) | Precision reference output | Delivers regulated 1.8 V; capable of sourcing up to 20 mA; optional COUT improves transient response but not required for stability |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM-trimmed CMOS bandgap | Enables post-assembly correction of tempco and initial accuracy - eliminates laser trimming cost while matching bipolar performance |
| Enable-controlled shutdown | Reduces supply current to 3 µA, enabling ultra-low-power sleep modes in portable data loggers and IoT edge sensors |
| No output capacitor required | Eliminates need for external COUT, reducing BOM count and PCB area - critical for space-constrained SOT-23 designs |
| AEC-Q100 Grade 1 qualified | Validated for –40°C to +125°C ambient operation with HBM ESD rating of ±2000 V - suitable for under-hood automotive sensors |
| Stable with low-ESR ceramics | Supports standard X5R/X7R MLCCs (≥1 µF) on VIN without phase-margin risk - simplifies layout and avoids tantalum dependency |
Applications
| Portable Data Acquisition | Automotive Sensor Conditioning |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter acquiring 16-bit ADC samples at 1 kSPS with <1 LSB INL error. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for SAR ADC and analog front-end op-amps. Use Value: 20 ppm/°C tempco and 50 ppm long-term stability ensure calibration validity over 12 months and across operating temperatures. |
Use Scenario: Engine coolant temperature sensor signal conditioning module in passenger vehicle ECU. IC Role / Device Role / Timing Role: Supplies precision bias to RTD interface circuit and ADC reference in AEC-Q100-compliant design. Use Value: Grade 1 qualification and ±0.2% initial accuracy meet ASAM MCD-2 MC requirements for automotive sensor linearity. |
| Industrial Process Transmitter | Medical Patient Monitor Analog Front-End |
|
Use Scenario: 4–20 mA loop-powered pressure transmitter requiring <0.1% total unadjusted error over –25°C to +70°C. IC Role / Device Role / Timing Role: Reference source for 24-bit ΣΔ ADC and programmable gain amplifier calibration. Use Value: 230 mV dropout enables operation from 3.3 V rail with margin, while 25 ppm/mA load regulation preserves accuracy during loop current modulation. |
Use Scenario: Portable ECG monitor measuring microvolt-level biopotentials with >100 dB SNR requirement. IC Role / Device Role / Timing Role: Low-noise (170 µVPP, 0.1–10 Hz) reference for instrumentation amplifier and ADC. Use Value: 170 µVPP integrated noise directly limits system noise floor - outperforms most 2.5 V references scaled to 1.8 V via divider. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3018IDBVR | Fixed 1.8 V, 50 ppm/°C max tempco, 50 µA IQ, no enable pin, SOT-23-3 | Lacks shutdown mode and has higher tempco; smaller footprint but no EN control | Select when board space is constrained and continuous operation suffices; not suitable for duty-cycled systems |
| ADR3418ARJZ-R7 | 1.8 V, 10 ppm/°C (A grade), 120 µA IQ, no enable, SOT-23-5, ±0.1% initial accuracy | Lower tempco but higher quiescent current and no shutdown - better stability, worse power efficiency | Prefer for metrology-grade instruments where long-term drift dominates power budget concerns |
Compared with REF3018IDBVR and ADR3418ARJZ-R7, the LM4132CMF-1.8 uniquely balances automotive qualification, enable-controlled ultra-low-power shutdown (3 µA), and 20 ppm/°C tempco in a standard SOT-23-5 - making it optimal for battery-operated industrial and automotive sensors requiring both reliability and energy efficiency.
Availability
LM4132CMF-1.8 is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, and industrial process transmitters requiring stable component supply with guaranteed long-term availability and traceable lot control.
Supply support for LM4132CMF-1.8 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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs and automotive electronics.
The LM4132 family was designed to deliver laser-trimmed reference accuracy using cost-effective CMOS processes - targeting high-reliability measurement, control, and sensor systems where thermal stability and long-term drift are critical.
FAQ
What is the maximum load current supported by the LM4132CMF-1.8?
The LM4132CMF-1.8 delivers up to 20 mA of output current while maintaining specified accuracy and regulation. This capability eliminates the need for an external buffer amplifier in most 12- to 16-bit data acquisition designs, directly driving ADC reference inputs and op-amp bias networks without degradation.
Does the LM4132CMF-1.8 require an output capacitor for stability?
No, the LM4132CMF-1.8 is internally compensated and stable without an output capacitor. A 0.1 µF ceramic capacitor (COUT) may be added to improve transient response, but it is strictly optional - unlike many competitors, this device does not mandate COUT for phase margin or oscillation prevention.
What is the minimum input voltage required for the LM4132CMF-1.8 to regulate at 1.8 V?
The LM4132CMF-1.8 requires a minimum input voltage of VREF + 400 mV, i.e., 2.2 V, to maintain regulation. At 10 mA load, the typical dropout is 230 mV, allowing reliable operation down to 2.03 V input - enabling use with partially discharged single-cell LiFePO₄ batteries.
How does the enable pin (EN) function on the LM4132CMF-1.8?
The EN pin is active-high: applying ≥65% of VIN enables regulation; pulling below 35% of VIN places the LM4132CMF-1.8 into shutdown mode, reducing supply current to 3 µA. Input hysteresis prevents oscillation near the threshold, ensuring clean state transitions during power sequencing.
Is the LM4132CMF-1.8 qualified for automotive applications?
Yes, the LM4132CMF-1.8 is AEC-Q100 Grade 1 qualified, rated for –40°C to +125°C ambient operation, and tested to HBM ESD Level 2 (±2000 V). It meets automotive sensor and ECU requirements where precision, reliability, and thermal robustness are mandatory.
LM4132CMF-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 170µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.2V ~ 5.5V
- Current - Supply:
- 100µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4132CMF-1.8 FAQ
1.How can I place an order for LM4132CMF-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4132CMF-1.8 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 LM4132CMF-1.8 reliable?
The price and inventory of LM4132CMF-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4132CMF-1.8 is usually 5 days.
3.What payment methods are accepted for LM4132CMF-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4132CMF-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4132CMF-1.8?
LM4132CMF-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4132CMF-1.8 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 LM4132CMF-1.8?
For technical support, including LM4132CMF-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4132CMF-1.8 requirements.
6.How does Aetrix verify that LM4132CMF-1.8 is sourced from the original manufacturer or authorized distributors?
All LM4132CMF-1.8 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 LM4132CMF-1.8 meets industry standards.
7.What is the process for return or replacement of LM4132CMF-1.8?
All LM4132CMF-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LM4132CMF-1.8, 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 LM4132CMF-1.8 part is unused and in its original packaging.
Return procedure for LM4132CMF-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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