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Texas Instruments LM4128DMF-1.8
- Part No.:
- LM4128DMF-1.8
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMF-1.8.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,733
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Product details
Overview
LM4128DMF-1.8 from Texas Instruments (formerly National Semiconductor) is a precision micropower series voltage reference in SOT-23-5 package, delivering 1.8 V output with ±1.0% initial accuracy and 100 ppm/°C temperature coefficient over −40°C to +125°C. It features 60 µA quiescent current, 400 mV dropout at 10 mA load, and an enable pin supporting 3 µA shutdown mode-ideal for low-power battery-operated instrumentation and portable data acquisition.
For engineers reviewing the LM4128DMF-1.8 datasheet, LM4128DMF-1.8 pinout, LM4128DMF-1.8 application, or LM4128DMF-1.8 equivalent, key selection considerations include its D-grade accuracy and tempco trade-off, SOT-23-5 footprint compatibility, enable-controlled power gating, and stability with up to 10 µF capacitive loads without external compensation.
Technical Context
The LM4128DMF-1.8 employs a band-gap–derived series reference architecture with internal enable logic, eliminating need for external stabilization capacitors while maintaining stability under capacitive loads ≤10 µF. Its low dropout (400 mV @ 10 mA) and 60 µA supply current enable operation from single-cell Li-ion or coin-cell sources.
It supports rail-to-rail input operation from (VREF + 400 mV) to 5.5 V, delivers up to 20 mA output current with 120 ppm/mA load regulation, and provides 170 µVPP (0.1–10 Hz) output noise-critical for high-resolution ADC biasing and precision analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±1.0% initial accuracy at 25°C - defines absolute error budget for 12-bit+ systems |
| Temperature Coefficient | 100 ppm/°C max (−40°C to +125°C) - contributes ≤±216 µV drift across full range |
| Quiescent Current | 60 µA typical - enables >1-year battery life in 10 µA average-current IoT sensors |
| Dropout Voltage | 400 mV max at 10 mA load - allows operation from 2.2 V supply, compatible with LDO outputs |
| Enable Function | EN pin enables 3 µA shutdown mode - reduces standby power by >95% vs active state |
| Load Regulation | 120 ppm/mA max - introduces ≤±216 µV error over 0–20 mA load swing |
| Noise (0.1–10 Hz) | 170 µVPP - supports <16-bit ENOB in precision SAR ADC references |
Pinout & Package
SOT-23-5 package (NS package number MF05A), 1.6 mm × 2.9 mm footprint, 1.3 mm height, gull-wing leads. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must remain unconnected and floating per datasheet |
| 2 | GND | Analog ground reference; requires low-impedance connection to system AGND plane |
| 3 | EN | Active-high enable input; ≥65% of VIN required for activation; internal 2 µA pull-up |
| 4 | VIN | Input supply rail; must exceed VREF + 400 mV (i.e., ≥2.2 V) for regulation |
| 5 | VREF | Precision 1.8 V output; stable with 0–10 µF ceramic capacitive loads; bypass capacitor recommended |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to 3 µA - extends shelf life and enables duty-cycled sensor nodes |
| No external stabilization cap needed | Stable with 0–10 µF ceramic loads - eliminates BOM cost and PCB area for compensation network |
| Low thermal hysteresis | 75 ppm max - ensures repeatable output after thermal cycling in industrial environments |
| Indefinite short-circuit protection | Limits output current to 75 mA - prevents damage during test fixture miswiring or board-level faults |
| Wide input range | Operates from VREF + 400 mV to 5.5 V - simplifies supply design across 2.2–5.5 V systems |
Applications
| Portable Data Loggers | Battery-Powered Medical Sensors |
|---|---|
Use Scenario: Continuous 16-bit ADC sampling in handheld ECG monitors powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Precision 1.8 V reference for ADC voltage scaling and DAC feedback path. Use Value: 100 ppm/°C tempco and 170 µVPP noise maintain <1 LSB error across body-temperature range (20–45°C). |
Use Scenario: Wearable pulse oximeter with intermittent SpO₂ measurement to maximize battery runtime. IC Role / Device Role / Timing Role: Enable-gated reference source activated only during ADC conversion windows. Use Value: 3 µA shutdown current reduces average system power by >90%, extending CR2032 life to >6 months. |
| Industrial Process Transmitters | Automotive Cabin Air Quality Modules |
Use Scenario: 4–20 mA loop-powered temperature transmitter operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Stable excitation reference for RTD bridge and ADC reference in isolated signal chain. Use Value: 100 ppm/°C tempco and −40°C to +125°C junction rating ensure calibration retention across automotive under-hood extremes. |
Use Scenario: Low-power CO₂/NIR gas sensor module mounted near HVAC ducts with wide thermal gradients. IC Role / Device Role / Timing Role: Primary voltage reference for analog front-end amplifiers and 12-bit SAR ADC. Use Value: 60 µA quiescent current and 400 mV dropout allow direct regulation from 3.3 V LDO, minimizing heat rise in sealed enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AUT18 | 1.8 V, ±0.06% initial accuracy, 3 ppm/°C tempco, 35 µA IQ - higher precision but 2× cost and no enable pin | Used in metrology-grade calibrators where long-term drift dominates; unsuitable for power-gated designs | Select when absolute accuracy and ultra-low tempco outweigh enable functionality and cost sensitivity |
| REF3318AIDBVR | 1.8 V, ±0.1% initial accuracy, 100 ppm/°C tempco, 3.9 µA IQ - lower power but 50 mA max output, no enable pin | Favored in always-on ultra-low-power nodes (e.g., NB-IoT sensors); lacks shutdown control for burst-mode operation | Select when sub-5 µA quiescent current is mandatory and enable control is unnecessary |
Compared with MAX6126AUT18 and REF3318AIDBVR, the LM4128DMF-1.8 uniquely balances D-grade accuracy, integrated enable functionality, and SOT-23-5 compatibility-making it optimal for cost-sensitive, intermittently powered industrial and automotive modules requiring proven thermal robustness.
Availability
LM4128DMF-1.8 is available at Aetrix Electronics and suitable for portable medical devices, industrial process transmitters, and automotive cabin air quality sensors requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128DMF-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 acquired National Semiconductor in 2011 and maintains full technical and manufacturing continuity for legacy precision analog products including the LM4128 family.
The LM4128 series was designed specifically for space-constrained, battery-powered instrumentation requiring micropower operation, low dropout, and guaranteed performance across −40°C to +125°C - targeting industrial, automotive, and portable medical markets.
FAQ
What is the maximum input voltage for LM4128DMF-1.8?
The LM4128DMF-1.8 supports a maximum input voltage of 5.5 V. Operation above this level risks permanent damage, as specified in Absolute Maximum Ratings. Input must also remain ≥2.2 V (VREF + 400 mV) to maintain regulation at 10 mA load - ensuring compatibility with common 2.5 V, 3.3 V, and 5 V supply rails.
Does LM4128DMF-1.8 require an input capacitor?
Yes, LM4128DMF-1.8 requires a minimum 0.1 µF ceramic input capacitor (X5R/X7R) for stable operation. When an output capacitor is used, CIN must be ≥ COUT. Larger values (4.7–22 µF) reduce output noise and startup overshoot. This requirement is non-optional and explicitly mandated in the Application Information section.
What is the output current capability of LM4128DMF-1.8?
The LM4128DMF-1.8 delivers up to 20 mA output current while maintaining regulation within datasheet limits. Short-circuit current is internally limited to 75 mA. Load regulation is specified as 120 ppm/mA max - meaning output voltage shifts ≤±216 µV across the full 0–20 mA range at room temperature.
How does the enable pin function on LM4128DMF-1.8?
The EN pin on LM4128DMF-1.8 is active-high with internal 2 µA pull-up. It enters shutdown mode (<7 µA total current) when pulled below 35% of VIN and activates fully when ≥65% of VIN. The pin may be tied directly to VIN if continuous operation is required. EN must never exceed VIN, as operation above that level causes undefined behavior.
Is LM4128DMF-1.8 qualified for automotive applications?
No - LM4128DMF-1.8 is the commercial-grade variant. Automotive-qualified equivalents are designated with "Q" suffixes (e.g., LM4128DQ1MF1.8), which undergo AEC-Q100 Grade 1 qualification, enhanced manufacturing controls, and extended reliability testing. LM4128DMF-1.8 is rated for −40°C to +125°C junction temperature but lacks automotive-specific qualification documentation.
LM4128DMF-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:
- ±1%
- Temperature Coefficient:
- 100ppm/°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
LM4128DMF-1.8 FAQ
1.How can I place an order for LM4128DMF-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMF-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 LM4128DMF-1.8 reliable?
The price and inventory of LM4128DMF-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 LM4128DMF-1.8 is usually 5 days.
3.What payment methods are accepted for LM4128DMF-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMF-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMF-1.8?
LM4128DMF-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMF-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 LM4128DMF-1.8?
For technical support, including LM4128DMF-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMF-1.8 requirements.
6.How does Aetrix verify that LM4128DMF-1.8 is sourced from the original manufacturer or authorized distributors?
All LM4128DMF-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 LM4128DMF-1.8 meets industry standards.
7.What is the process for return or replacement of LM4128DMF-1.8?
All LM4128DMF-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMF-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 LM4128DMF-1.8 part is unused and in its original packaging.
Return procedure for LM4128DMF-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128DMF-1.8 Tags
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