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Texas Instruments LM4132EMFX-3.3
- Part No.:
- LM4132EMFX-3.3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4132EMFX-3.3.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,636
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Product details
Overview
LM4132EMFX-3.3 from Texas Instruments is a precision low-dropout (LDO) series voltage reference IC delivering a stable 3.3 V output with 0.05% initial accuracy (Grade A), 10 ppm/°C temperature coefficient (0°C to 85°C), and 60 µA quiescent current - used in high-resolution ADC/DAC biasing, portable instrumentation, and automotive sensor signal conditioning.
For engineers reviewing the LM4132EMFX-3.3 datasheet, LM4132EMFX-3.3 pinout, LM4132EMFX-3.3 application, or LM4132EMFX-3.3 equivalent, key selection criteria include dropout voltage (175 mV at 10 mA), enable-controlled shutdown (3 µA), load regulation (25 ppm/mA), and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LM4132EMFX-3.3 uses EEPROM-trimmed CMOS band-gap architecture to achieve laser-trimmed bipolar-level precision without laser trimming, correcting curvature, tempco, and accuracy at package level to overcome assembly-induced shifts. It operates as a series reference, eliminating idle current waste inherent in shunt types.
It features an active-high enable pin (VIH = 65% VIN), supports up to 20 mA output current, requires only a single input capacitor (CIN), and remains stable with low-ESR ceramic capacitors - no output buffer or COUT required for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±0.05% (Grade A) - enables direct interface with 3.3 V logic and SAR ADC reference inputs without scaling. |
| Tempco | 10 ppm/°C (0°C to 85°C) - ensures ≤265 ppm total drift over industrial range, critical for <16-bit measurement stability. |
| Dropout Voltage | 175 mV at 10 mA - allows operation from 3.475 V supply, supporting single-cell LiFePO₄ or regulated 3.6 V rails. |
| Quiescent Current | 60 µA - enables multi-year battery life in always-on sensor nodes with periodic wake-up sampling. |
| Shutdown Current | 3 µA (EN = low) - reduces system standby power by >95% versus active mode, essential for energy harvesting designs. |
| Load Regulation | 25 ppm/mA - maintains <83 µV change per mA load shift, preserving accuracy in varying-sink applications like DAC buffers. |
| Noise (0.1–10 Hz) | 310 µVPP - compatible with 16-bit+ data acquisition where reference noise dominates system ENOB. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads; thermally enhanced for 125°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; not internally bonded - no routing or grounding allowed. |
| 2 - GND | Analog ground reference | Primary return path for reference output and internal band-gap core; requires dedicated low-impedance plane connection. |
| 3 - EN | Enable control input | Active-high digital input (VIH ≥ 65% VIN); drives internal pass device - enables microcontroller-controlled power gating. |
| 4 - VIN | Input supply rail | Accepts 3.7 V to 5.5 V (VREF + 400 mV min); must be decoupled with ≥1 µF ceramic capacitor close to pin. |
| 5 - VREF | Precision output terminal | Delivers regulated 3.3 V; capable of sourcing up to 20 mA; requires minimal trace length to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM-based curvature correction | Compensates die-to-package thermal stress shifts post-assembly, enabling 0.05% accuracy without laser trimming. |
| Enable pin with hysteresis | Provides clean turn-on/turn-off with ~100 mV input hysteresis, preventing oscillation during slow-rising supply ramps. |
| No output capacitor required | Eliminates COUT dependency - simplifies layout, reduces BOM count, and avoids ESR-related instability in portable systems. |
| Stable with low-ESR ceramics | Supports X5R/X7R MLCCs down to 2 Ω ESR, enabling compact, high-reliability filtering without tantalum or electrolytic parts. |
| Automotive-grade option available | LM4132-Q1 variant qualified to AEC-Q100 Grade 1 (–40°C to +125°C), suitable for engine control and ADAS sensor modules. |
Applications
| Portable Data Loggers | Automotive Cabin Sensors |
|---|---|
|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and CO₂ with 16-bit sigma-delta ADCs. IC Role / Device Role / Timing Role: Primary voltage reference for ADC VREF input and analog front-end biasing. Use Value: 310 µVPP low-frequency noise and 10 ppm/°C tempco ensure <±0.005% full-scale error across –20°C to 60°C operating range. |
Use Scenario: Occupancy detection using MEMS accelerometers and IR proximity sensors in HVAC control modules. IC Role / Device Role / Timing Role: Stable 3.3 V reference for sensor signal conditioning and microcontroller I/O voltage translation. Use Value: 60 µA quiescent current and 3 µA shutdown mode extend 200 mAh coin-cell life to >5 years in sleep-wake cycles. |
| Industrial PLC Analog Inputs | Medical Patient Monitoring |
|
Use Scenario: Modular I/O cards acquiring 4–20 mA loop signals and thermocouple voltages in factory automation cabinets. IC Role / Device Role / Timing Role: Precision reference for programmable gain instrumentation amplifiers and 24-bit delta-sigma ADCs. Use Value: 25 ppm/mA load regulation and 175 mV dropout allow direct use from 3.6 V backup rail during main supply interruption. |
Use Scenario: Portable ECG and pulse oximeter devices requiring FDA-compliant signal integrity and low-power operation. IC Role / Device Role / Timing Role: Reference source for analog front-end filters, ADCs, and LED driver biasing in optical sensing paths. Use Value: 0.05% initial accuracy and 50 ppm long-term stability (1000 hrs) meet IEC 60601-1 accuracy requirements for Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3333AIDBVR | Fixed 3.3 V, 30 ppm/°C max tempco (Grade A), 3.8 µA IQ, 5.5 V max VIN, SOT-23-5 | Ultra-low power but higher tempco; unsuitable for wide-temperature industrial use | Select when battery life > accuracy stability; avoid for >85°C ambient or metrology-grade systems |
| ADR3433ARJZ-R7 | 3.3 V, 10 ppm/°C max, 120 µA IQ, 5.5 V max VIN, SOT-23-5, ±0.1% initial accuracy (Grade B) | Higher quiescent current, wider initial tolerance; no enable pin | Choose if enable functionality is unnecessary and cost sensitivity outweighs 60 µA vs 120 µA trade-off |
Compared with REF3333AIDBVR and ADR3433ARJZ-R7, the LM4132EMFX-3.3 uniquely combines Grade A accuracy (0.05%), ultra-low IQ (60 µA), and integrated enable control - making it optimal for battery-powered, wide-temperature, and precision-critical embedded systems where all three attributes are simultaneously required.
Availability
LM4132EMFX-3.3 is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin electronics, industrial PLC analog inputs, and medical patient monitoring requiring stable component supply with guaranteed long-term availability.
Supply support for LM4132EMFX-3.3 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 automotive-qualified components.
The LM4132 family was engineered to deliver laser-trimmed performance in cost-effective CMOS packaging - targeting high-accuracy, low-power, and space-constrained applications in industrial, medical, and automotive markets.
FAQ
What is the maximum load current supported by the LM4132EMFX-3.3?
The LM4132EMFX-3.3 delivers up to 20 mA of output current while maintaining specified accuracy and regulation. This capability eliminates the need for external buffer amplifiers in most 3.3 V reference applications, including driving ADC reference inputs, op-amp bias networks, and moderate-current sensor excitation circuits. Exceeding 20 mA may degrade output voltage stability and increase dropout voltage beyond specification limits.
Does the LM4132EMFX-3.3 require an output capacitor (COUT) for stability?
No, the LM4132EMFX-3.3 is designed to operate stably without an output capacitor - a key differentiator from many competing references. Its internal compensation and architecture allow direct connection to ADC VREF pins or analog circuitry. An optional COUT (e.g., 0.1 µF ceramic) can further reduce high-frequency noise but is not required for basic stability or regulation performance.
What is the minimum input voltage required for the LM4132EMFX-3.3 to maintain regulation?
The LM4132EMFX-3.3 requires a minimum input voltage of VREF + 400 mV, i.e., 3.7 V, to maintain regulation under all conditions. At 10 mA load, its typical dropout is 175 mV, allowing reliable operation down to 3.475 V - useful for brown-out tolerant designs powered from aging batteries or marginally regulated supplies.
How does the enable pin (EN) function on the LM4132EMFX-3.3?
The EN pin on the LM4132EMFX-3.3 is an active-high digital control input. When pulled high to ≥65% of VIN, the device powers up and delivers 3.3 V output; when pulled low to ≤35% of VIN, it enters shutdown mode drawing only 3 µA. The built-in hysteresis prevents chatter during slow-rising enable signals, ensuring robust state transitions in microcontroller-driven power management systems.
Is the LM4132EMFX-3.3 suitable for automotive applications?
The LM4132EMFX-3.3 is the commercial-grade version (non-Q1) and is not AEC-Q100 qualified. For automotive use, TI offers the LM4132-3.3-Q1 variant (e.g., LM4132C33QDBVR), which is qualified to Grade 1 (–40°C to +125°C ambient) and meets HBM ESD Level 2. Engineers designing for automotive cabin or chassis modules must select the Q1 part number to ensure compliance and reliability.
LM4132EMFX-3.3 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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 30ppm/°C
- Noise - 0.1Hz to 10Hz:
- 310µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.7V ~ 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
LM4132EMFX-3.3 FAQ
1.How can I place an order for LM4132EMFX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4132EMFX-3.3 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 LM4132EMFX-3.3 reliable?
The price and inventory of LM4132EMFX-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4132EMFX-3.3 is usually 5 days.
3.What payment methods are accepted for LM4132EMFX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4132EMFX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4132EMFX-3.3?
LM4132EMFX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4132EMFX-3.3 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 LM4132EMFX-3.3?
For technical support, including LM4132EMFX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4132EMFX-3.3 requirements.
6.How does Aetrix verify that LM4132EMFX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM4132EMFX-3.3 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 LM4132EMFX-3.3 meets industry standards.
7.What is the process for return or replacement of LM4132EMFX-3.3?
All LM4132EMFX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM4132EMFX-3.3, 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 LM4132EMFX-3.3 part is unused and in its original packaging.
Return procedure for LM4132EMFX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4132EMFX-3.3 Tags
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