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Texas Instruments LM4128AMF-4.1
- Part No.:
- LM4128AMF-4.1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMF-4.1.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,438
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Product details
Overview
LM4128AMF-4.1 from National Semiconductor is a precision micropower series voltage reference in SOT-23-5 package, delivering 4.096 V output with ±0.1% initial accuracy, 75 ppm/°C temperature coefficient, and 60 µA quiescent current. It features an enable pin for 3 µA shutdown mode, supports up to 20 mA load, and operates from −40°C to +125°C - ideal for high-resolution ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128AMF-4.1 datasheet, LM4128AMF-4.1 pinout, LM4128AMF-4.1 application, or LM4128AMF-4.1 equivalent, key selection considerations include dropout voltage (≤400 mV at 10 mA), line regulation (100 ppm/V), load regulation (25–120 ppm/mA), 0.1–10 Hz noise (350 µVPP), and AEC-Q100 Grade 1 qualification availability in automotive variants.
Technical Context
The LM4128AMF-4.1 uses a band-gap-derived reference core with internal trimming for high initial accuracy and low thermal drift. Its series architecture eliminates external stabilization capacitors while maintaining stability with capacitive loads up to 10 µF - enabling compact, low-BOM designs.
It integrates an enable input (EN) referenced to VIN, with VIH ≥ 65% VIN and VIL ≤ 35% VIN, allowing direct microcontroller GPIO control. Dropout is defined as the minimum VIN–VREF differential sustaining 0.5% output error, specified at 175–400 mV across load and grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal; enables precise 12-bit ADC full-scale alignment without scaling resistors |
| Initial Accuracy | ±0.1% at 25°C; guarantees ≤ ±4.1 mV absolute error before calibration |
| Tempco | 75 ppm/°C max; contributes ≤ ±37.5 ppm (≈ ±0.15 mV) over −40°C to +125°C span |
| Quiescent Current | 60 µA typical; supports >1-year battery life in 10 µA sleep-cycle systems |
| Shutdown Current | 3 µA max; reduces system standby power by >95% vs active mode |
| Dropout Voltage | 175–400 mV at 10 mA; allows operation from 4.271 V supply (e.g., single Li-ion) |
| Output Noise | 350 µVPP (0.1–10 Hz); limits effective resolution to <16 bits in precision DAQ |
Pinout & Package
SOT-23-5 package (NS MF05A), 1.6 mm × 2.9 mm footprint, 1.1 mm height, gull-wing leads. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect; must remain floating - not tied to GND or VIN |
| 2 | GND | Analog ground reference; requires low-impedance connection to PCB ground plane |
| 3 | EN | Enable input; pulled up internally (~2 µA); drives high to activate reference output |
| 4 | VIN | Input supply; must exceed VREF + 400 mV (≥4.496 V) for 10 mA load |
| 5 | VREF | Precision output; capable of sourcing up to 20 mA with <120 ppm/mA load regulation |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Operates stably without output capacitor; eliminates BOM cost and layout area for decoupling |
| Low ESR ceramic compatibility | Stable with X5R/X7R MLCCs; avoids instability risks from electrolytic or high-ESR types |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault; prevents thermal runaway or damage |
| Thermal hysteresis | 75 ppm max; ensures repeatable output after thermal cycling between −40°C and +125°C |
| Long-term stability | 50 ppm over 1000 hours; reduces recalibration frequency in field-deployed test equipment |
Applications
| Portable Data Acquisition | Precision Battery Monitoring |
|---|---|
Use Scenario: Handheld multimeter sampling 16-bit sigma-delta ADC at 10 SPS with auto-ranging. IC Role / Device Role / Timing Role: Primary voltage reference for ADC analog front-end, setting full-scale range and offset null point. Use Value: ±0.1% initial accuracy and 75 ppm/°C tempco maintain <0.01% measurement uncertainty across operating temperature. |
Use Scenario: Lithium-ion pack monitor IC measuring cell voltages in electric scooter BMS. IC Role / Device Role / Timing Role: Stable 4.096 V reference for 12-bit SAR ADC converting cell voltage via resistor divider. Use Value: 60 µA supply current extends sleep-mode battery life; 400 mV dropout enables operation down to 4.5 V pack voltage. |
| Automotive Sensor Signal Conditioning | Industrial PLC Analog Input Module |
Use Scenario: Engine coolant temperature sensor signal conditioning in AEC-Q100 qualified ECU. IC Role / Device Role / Timing Role: Precision reference for ratiometric bridge amplifier and ADC, rejecting supply ripple. Use Value: A-grade accuracy and automotive flow qualification ensure compliance with ASIL-B functional safety requirements. |
Use Scenario: 4–20 mA loop-powered transmitter with local 16-bit DAC for setpoint generation. IC Role / Device Role / Timing Role: Reference source for DAC and current-sense amplifier, defining loop current accuracy. Use Value: 350 µVPP low-frequency noise prevents sub-LSB errors in 16-bit control resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3040AIDBZR | 4.096 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-3 (no EN pin) | No enable function; fixed output; lower tempco but higher initial error | Select when shutdown control is unnecessary and tighter tempco outweighs accuracy loss |
| ADR3440ARJZ-R7 | 4.096 V, ±0.1% initial accuracy, 10 ppm/°C, 120 µA IQ, SOT-23-5 (with EN) | Lower noise (12 µVRMS), superior tempco, but 2× higher supply current | Select for ultra-stable metrology-grade references where power budget permits |
Compared with LM4128AMF-4.1, REF3040AIDBZR trades enable functionality and accuracy for lower tempco and current, while ADR3440ARJZ-R7 delivers significantly better stability at the cost of 100% higher quiescent power - making LM4128AMF-4.1 optimal for space-constrained, battery-sensitive designs requiring balanced performance.
Availability
LM4128AMF-4.1 is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, industrial PLC analog inputs, and battery-powered medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128AMF-4.1 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
National Semiconductor was a U.S.-based analog semiconductor company acquired by Texas Instruments in 2011; its precision reference portfolio remains widely deployed in industrial and automotive systems.
The LM4128 series was designed specifically for micropower, high-accuracy voltage referencing in space-constrained, battery-operated, and thermally demanding applications - emphasizing low dropout, capacitor-free stability, and AEC-Q100 readiness.
FAQ
What is the maximum input voltage for LM4128AMF-4.1?
The LM4128AMF-4.1 has an absolute maximum input voltage of 6 V and an operating maximum of 5.5 V. For reliable operation at full 20 mA load, VIN must be ≥ VREF + 400 mV = 4.496 V. Exceeding 5.5 V risks permanent damage per Absolute Maximum Ratings.
Does LM4128AMF-4.1 require an input capacitor?
Yes - an input capacitor (CIN) is mandatory. The LM4128AMF-4.1 requires CIN ≥ COUT, with a minimum of 0.1 µF if no output capacitor is used. Ceramic X5R/X7R types are recommended; insufficient CIN causes instability or startup failure.
Can LM4128AMF-4.1 drive a 10 µF capacitive load?
Yes - the LM4128AMF-4.1 is explicitly characterized for stability with capacitive loads up to 10 µF. This eliminates need for isolation resistors and simplifies filtering in high-precision data acquisition circuits.
What is the shutdown behavior of LM4128AMF-4.1?
When EN is pulled low (<35% VIN), the LM4128AMF-4.1 enters shutdown mode drawing ≤7 µA (typical 3 µA). Output is disabled and VREF goes high-impedance; recovery time to 90% of final value is ~33 µs into 1 µF load.
Is LM4128AMF-4.1 qualified for automotive use?
The base LM4128AMF-4.1 is not automotive-qualified, but the pin-compatible LM4128AQ1MF4.1 variant is AEC-Q100 Grade 1 qualified and manufactured on automotive-grade flow - with identical electrical specs and enhanced reliability testing.
LM4128AMF-4.1 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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 350µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.496V ~ 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
LM4128AMF-4.1 FAQ
1.How can I place an order for LM4128AMF-4.1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMF-4.1 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 LM4128AMF-4.1 reliable?
The price and inventory of LM4128AMF-4.1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128AMF-4.1 is usually 5 days.
3.What payment methods are accepted for LM4128AMF-4.1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMF-4.1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMF-4.1?
LM4128AMF-4.1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMF-4.1 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 LM4128AMF-4.1?
For technical support, including LM4128AMF-4.1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMF-4.1 requirements.
6.How does Aetrix verify that LM4128AMF-4.1 is sourced from the original manufacturer or authorized distributors?
All LM4128AMF-4.1 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 LM4128AMF-4.1 meets industry standards.
7.What is the process for return or replacement of LM4128AMF-4.1?
All LM4128AMF-4.1 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMF-4.1, 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 LM4128AMF-4.1 part is unused and in its original packaging.
Return procedure for LM4128AMF-4.1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128AMF-4.1 Tags
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