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Texas Instruments LM4128AMF-1.8
- Part No.:
- LM4128AMF-1.8
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMF-1.8.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,978
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Product details
Overview
LM4128AMF-1.8 from National Semiconductor is a precision micropower series voltage reference in SOT-23-5 package, delivering 1.8 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 and supports up to 20 mA load current - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128AMF-1.8 datasheet, LM4128AMF-1.8 pinout, LM4128AMF-1.8 application, or LM4128AMF-1.8 equivalent, key selection criteria include dropout voltage (400 mV max at 10 mA), line regulation (30 ppm/V), load regulation (25–120 ppm/mA), and stability with capacitive loads up to 10 µF without external compensation.
Technical Context
The LM4128AMF-1.8 employs a band-gap-derived reference core optimized for low-power operation and high DC precision. Its series architecture eliminates idle current waste typical of shunt references, enabling efficient use in low-IQ systems.
It integrates an internal enable control path with 35%VIN low-level and 65%VIN high-level thresholds, supporting direct microcontroller GPIO interfacing. The device maintains regulation over −40°C to +125°C junction temperature with guaranteed long-term stability of 50 ppm over 1000 hours.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.1% initial accuracy at 25°C - ensures ≤1.8 mV absolute error in precision ADC/DAC biasing |
| Temperature Coefficient | 75 ppm/°C max - contributes ≤135 µV drift over −40°C to +125°C span |
| Quiescent Current | 60 µA typical - enables multi-year battery life in always-on sensor nodes |
| Shutdown Current | 3 µA max - reduces system standby power by >95% vs active mode |
| Dropout Voltage | 400 mV max at 10 mA load - allows operation from 2.2 V supply in Li-ion single-cell systems |
| Line Regulation | 30 ppm/V - limits output shift to ≤54 µV per volt input variation |
| Load Regulation | 25 ppm/mA typical - holds output within ±0.5 µV per 1 µA load change near full scale |
Pinout & Package
SOT-23-5 package (NS Package Number MF05A), 1.6 mm × 2.9 mm footprint, 1.1 mm height, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must remain unconnected and floating - no internal connection or parasitic coupling |
| 2 | GND | Analog ground reference; requires low-impedance PCB plane connection to minimize noise injection |
| 3 | EN | Active-high enable input; pulls up internally (~2 µA); drives high to activate reference, low to enter 3 µA shutdown |
| 4 | VIN | Input supply rail; must exceed VREF + 400 mV (≥2.2 V) and stay ≤5.5 V for stable operation |
| 5 | VREF | Precision 1.8 V output; capable of sourcing up to 20 mA while maintaining specified accuracy and regulation |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-free stability | Stable with no output capacitor required; supports up to 10 µF ceramic load capacitance without oscillation |
| Micropower operation | 60 µA supply current enables integration into energy-harvesting and ultra-low-power IoT endpoints |
| Low thermal hysteresis | 75 ppm max - minimizes repeatability error after thermal cycling in industrial field instruments |
| Indefinite short-circuit protection | Self-limits output to 75 mA during fault; recovers automatically when load is removed |
| Wide operating temperature | −40°C to +125°C junction range - qualified for under-hood automotive and factory-floor industrial use |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor with 16-bit SAR ADC sampling analog biosensor output. IC Role / Device Role / Timing Role: Precision 1.8 V reference for ADC full-scale calibration and sensor excitation bias. Use Value: ±0.1% initial accuracy and 75 ppm/°C tempco ensure <0.01% total unadjusted error across body temperature range (32–42°C). |
Use Scenario: Remote environmental node logging temperature/humidity every 5 minutes using coin-cell battery. IC Role / Device Role / Timing Role: Low-quiescent-current voltage reference powering ADC and MCU analog subsystem only during active measurement windows. Use Value: 60 µA active current and 3 µA shutdown reduce average system current to <1 µA, extending 220 mAh CR2032 life beyond 7 years. |
| Industrial Process Transmitters | Automotive Cabin Control Modules |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Stable 1.8 V reference for DAC-based current loop control and sensor signal conditioning. Use Value: Guaranteed 75 ppm/°C tempco and 50 ppm long-term stability meet IEC 61297 Class B accuracy requirements for 5-year field deployment. |
Use Scenario: HVAC control unit with touch interface and ambient light sensing in vehicle cabin. IC Role / Device Role / Timing Role: Enable-controlled reference supplying precision bias to optical sensor front-end and display driver ADC. Use Value: EN pin allows synchronous shutdown with MCU sleep mode, eliminating reference-related leakage during 99%+ duty-cycle idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3018AIDBVR | 1.8 V, ±0.2% initial accuracy, 100 ppm/°C, 50 µA IQ, SOT-23-5 | Higher tempco and lower accuracy than LM4128AMF-1.8; no enable pin | Select when lowest possible quiescent current is critical and enable control is unnecessary |
| ADR3418ARJZ-R7 | 1.8 V, ±0.1% initial accuracy, 50 ppm/°C, 120 µA IQ, SOT-23-5 | Lower tempco but higher supply current; no shutdown mode | Select when tighter temperature drift is required and system can accommodate higher active power |
Compared with REF3018AIDBVR and ADR3418ARJZ-R7, the LM4128AMF-1.8 uniquely combines A-grade accuracy, industry-leading 75 ppm/°C tempco, micropower operation, and integrated enable functionality - making it optimal for space-constrained, battery-sensitive designs requiring both precision and dynamic power control.
Availability
LM4128AMF-1.8 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial process transmitters, and automotive cabin control modules requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LM4128AMF-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
National Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by Texas Instruments in 2011; its precision reference portfolio remains widely deployed in industrial and automotive systems.
The LM4128 series was designed as a micropower, high-accuracy series voltage reference family targeting space-constrained, battery-operated instrumentation and data acquisition systems requiring robust performance across −40°C to +125°C.
FAQ
What is the minimum input voltage required for stable operation of the LM4128AMF-1.8?
The LM4128AMF-1.8 requires VIN ≥ VREF + 400 mV, i.e., ≥2.2 V, to maintain regulation at 10 mA load. Below this threshold, output voltage drops nonlinearly; operation down to 2.2 V is fully specified across −40°C to +125°C. Input voltage must not exceed 5.5 V.
Does the LM4128AMF-1.8 require an external output capacitor for stability?
No - the LM4128AMF-1.8 is internally compensated and stable with zero output capacitance. An optional ceramic capacitor (up to 10 µF) may be added to improve load transient response, but it is never required for stability. Input capacitor (≥0.1 µF) is mandatory.
How does the enable pin (EN) function on the LM4128AMF-1.8?
The EN pin is active-high with internal ~2 µA pull-up. Driving EN ≥65% of VIN activates the reference; driving EN ≤35% of VIN places LM4128AMF-1.8 in 3 µA shutdown mode. EN must never exceed VIN, and floating EN defaults to active state via internal pull-up.
What is the output noise performance of the LM4128AMF-1.8?
The LM4128AMF-1.8 delivers 170 µVPP (0.1 Hz to 10 Hz), measured at 1.8 V output. This low noise supports high-resolution (≥16-bit) data conversion without additional filtering, especially critical in precision sensor signal chains where reference noise directly limits SNR.
Is the LM4128AMF-1.8 suitable for automotive applications?
The LM4128AMF-1.8 itself is not AEC-Q100 qualified; however, the pin-compatible LM4128AQ1MF1.8 (A-grade automotive variant) is AEC-Q100 Grade 1 qualified and manufactured on automotive flow. For automotive designs, LM4128AQ1MF1.8 must be selected instead of LM4128AMF-1.8.
LM4128AMF-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:
- ±0.1%
- Temperature Coefficient:
- 75ppm/°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
LM4128AMF-1.8 FAQ
1.How can I place an order for LM4128AMF-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMF-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 LM4128AMF-1.8 reliable?
The price and inventory of LM4128AMF-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 LM4128AMF-1.8 is usually 5 days.
3.What payment methods are accepted for LM4128AMF-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMF-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMF-1.8?
LM4128AMF-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMF-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 LM4128AMF-1.8?
For technical support, including LM4128AMF-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMF-1.8 requirements.
6.How does Aetrix verify that LM4128AMF-1.8 is sourced from the original manufacturer or authorized distributors?
All LM4128AMF-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 LM4128AMF-1.8 meets industry standards.
7.What is the process for return or replacement of LM4128AMF-1.8?
All LM4128AMF-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMF-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 LM4128AMF-1.8 part is unused and in its original packaging.
Return procedure for LM4128AMF-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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