My Inquiry
My Account
Texas Instruments LM4128AMF-2.5/NOPB
- Part No.:
- LM4128AMF-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMF-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,709
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4128AMF-2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 2.5 V output with ±0.1% initial accuracy (Grade A), 75 ppm/°C max temperature coefficient, and 60 µA supply 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-accuracy ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128AMF-2.5/NOPB datasheet, LM4128AMF-2.5/NOPB pinout, LM4128AMF-2.5/NOPB application, or LM4128AMF-2.5/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), 0.1 Hz–10 Hz output noise (275 µVPP), stability with capacitive loads up to 10 µF, and compatibility with low-ESR ceramic bypass capacitors without external compensation.
Technical Context
The LM4128AMF-2.5/NOPB uses an advanced band-gap-derived reference core optimized for micropower operation and minimal thermal drift. Its internal architecture eliminates need for external stabilization capacitors while maintaining stability with output capacitance up to 10 µF - enabling robust performance in space-constrained layouts.
It implements a dedicated enable input (EN) referenced to VIN, with guaranteed VIH ≥65% VIN and VIL ≤35% VIN, allowing direct interfacing with 1.8 V, 3.3 V, or 5 V logic. The device maintains regulation across input voltages from (VREF + 400 mV) to 5.5 V, supporting battery-powered systems with varying supply headroom.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.1% initial accuracy (Grade A) - ensures ≤2.5 mV absolute error at 25°C for 12-bit+ data converters |
| Tempco | 75 ppm/°C max (−40°C to +125°C) - limits drift to ±18.75 ppm over full range, critical for industrial sensor calibration |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA-sleep systems with periodic reference activation |
| Shutdown Current | 3 µA max when EN = 0 V - reduces quiescent power by 95% during idle intervals |
| Dropout Voltage | 175 mV min / 400 mV max at 10 mA - allows operation from 2.675 V supply in Li-ion single-cell applications |
| Noise (0.1–10 Hz) | 275 µVPP - contributes <0.011% of full-scale error in 2.5 V 16-bit ADCs (LSB = 38 µV) |
| Load Capability | 20 mA max sourcing - sufficient to drive multiple op-amp references or SAR ADC reference inputs simultaneously |
Pinout & Package
LM4128AMF-2.5/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package with 1.27 mm pitch, rated for −40°C to +125°C junction temperature and MSL Level-1 reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; no internal connection or function |
| 2 - GND | Analog ground reference | Primary return path for reference current; requires low-impedance PCB connection to minimize noise coupling |
| 3 - EN | Enable control input | Active-high logic input; pulls up internally (~2 µA); drives reference core ON/OFF with 3 µA shutdown current |
| 4 - VIN | Input supply rail | Accepts 2.9 V to 5.5 V; must exceed VREF by ≥400 mV for regulation; supplies both core and output stage |
| 5 - VREF | Precision output terminal | Delivers stable 2.5 V; capable of sourcing up to 20 mA; requires CIN ≥0.1 µF for stability |
Key Features
| Feature | Design Value |
|---|---|
| Grade-A precision | ±0.1% initial accuracy and 75 ppm/°C tempco - meets requirements for Class I portable test equipment per IEC 61000-4-30 |
| Capacitor-free stability | Stable with no output capacitor and up to 10 µF capacitive load - eliminates layout sensitivity and BOM cost of external COUT |
| Micropower operation | 60 µA supply current - enables use in energy-harvesting nodes where average current budget is <100 µA |
| Low-noise output | 275 µVPP (0.1–10 Hz) - supports 16-bit resolution in precision data acquisition without post-filtering |
| Wide temperature range | −40°C to +125°C operation - qualified for under-hood automotive and industrial motor control environments |
Applications
| Portable Instrumentation | Industrial Data Acquisition |
|---|---|
|
Use Scenario: Handheld multimeter with 16-bit sigma-delta ADC and auto-ranging front-end. IC Role / Device Role / Timing Role: Primary voltage reference for ADC conversion and DAC-based offset trimming. Use Value: 0.1% initial accuracy and 75 ppm/°C tempco ensure measurement repeatability across battery discharge and ambient temperature shifts. |
Use Scenario: 4–20 mA loop-powered sensor transmitter with local analog signal conditioning. IC Role / Device Role / Timing Role: Stable excitation source for RTD/thermistor bridges and reference for 12-bit DAC output scaling. Use Value: 60 µA supply current minimizes burden on loop power; 20 mA output drives multiple op-amps without gain error. |
| Battery-Powered Medical Devices | Automotive Sensor Modules |
|
Use Scenario: Portable ECG monitor with low-power analog front-end and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Reference for biopotential amplifier gain-setting and ADC full-scale calibration. Use Value: 275 µVPP low-frequency noise prevents baseline wander artifacts; shutdown mode extends battery life between measurements. |
Use Scenario: Engine coolant temperature sensor module operating in under-hood environment. IC Role / Device Role / Timing Role: Precision bias for thermistor interface and reference for diagnostic ADC channel. Use Value: −40°C to +125°C rating and AEC-Q100 qualification (via LM4128AQ family) support functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V, ±0.2% initial accuracy, 100 ppm/°C, 50 µA IQ, SOT-23-3 - no enable pin, lower quiescent current but no shutdown mode | Lacks enable control; unsuitable for duty-cycled systems requiring deep sleep states | Select when lowest possible IQ is critical and enable functionality is not required |
| ADR3425ARJZ-R7 | 2.5 V, ±0.1% initial accuracy, 10 ppm/°C max, 120 µA IQ, SOT-23-5 - superior tempco but higher supply current and cost | Higher precision tempco enables sub-16-bit metrology; less suitable for ultra-low-power designs | Select when long-term thermal stability dominates over quiescent power budget |
Compared with REF3025AIDBZR and ADR3425ARJZ-R7, the LM4128AMF-2.5/NOPB uniquely balances Grade-A accuracy, micropower operation, and integrated enable control in a standard SOT-23-5 footprint - making it optimal for battery-operated instrumentation where dynamic power management is essential.
Availability
LM4128AMF-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and battery-powered medical devices requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128AMF-2.5/NOPB 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 analog IC design and high-reliability manufacturing.
The LM4128 series was developed specifically for space-constrained, battery-sensitive applications demanding high initial accuracy, low drift, and zero-compensation stability - targeting portable test gear, industrial sensors, and automotive subsystems.
FAQ
What is the minimum input voltage required for LM4128AMF-2.5/NOPB to regulate properly?
The LM4128AMF-2.5/NOPB requires VIN ≥ (VREF + 400 mV) = 2.9 V for proper regulation at 10 mA load. At lighter loads, dropout decreases - e.g., 175 mV at 10 mA per datasheet. Below 2.9 V, output voltage drops nonlinearly and specification guarantees no longer apply. Always verify headroom across worst-case temperature and load conditions.
Does LM4128AMF-2.5/NOPB require an external output capacitor (COUT)?
No - the LM4128AMF-2.5/NOPB is internally compensated and stable with or without COUT. An optional COUT (up to 10 µF) improves load transient response but increases turn-on time. CIN ≥0.1 µF is mandatory; if COUT is used, CIN must be ≥COUT per TI application guidance.
What is the maximum load current supported by LM4128AMF-2.5/NOPB?
The LM4128AMF-2.5/NOPB is specified to source up to 20 mA continuously while maintaining output accuracy within datasheet limits. Short-circuit protection limits output current to 75 mA indefinitely. For sustained 20 mA operation, ensure junction temperature remains ≤125°C using appropriate PCB copper area and ambient conditions.
How does the enable pin (EN) function on LM4128AMF-2.5/NOPB?
The EN pin is active-high with internal ~2 µA pull-up. Driving EN ≥65% of VIN enables the reference; driving EN ≤35% of VIN disables it, reducing supply current to ≤7 µA. EN may be tied directly to VIN for always-on operation. Do not apply EN > VIN - this violates absolute maximum ratings and risks damage.
Is LM4128AMF-2.5/NOPB suitable for automotive applications?
The LM4128AMF-2.5/NOPB itself is not AEC-Q100 qualified; however, its automotive-grade counterpart LM4128AQMF-2.5/NOPB is AEC-Q100 Grade 1 qualified (−40°C to +125°C). For production automotive use, specify the AQ variant. LM4128AMF-2.5/NOPB may be used in non-safety-critical prototyping or consumer-grade automotive accessories.
LM4128AMF-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 275µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.9V ~ 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-2.5/NOPB FAQ
1.How can I place an order for LM4128AMF-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMF-2.5/NOPB 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-2.5/NOPB reliable?
The price and inventory of LM4128AMF-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128AMF-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AMF-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMF-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMF-2.5/NOPB?
LM4128AMF-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMF-2.5/NOPB 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-2.5/NOPB?
For technical support, including LM4128AMF-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMF-2.5/NOPB requirements.
6.How does Aetrix verify that LM4128AMF-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AMF-2.5/NOPB 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-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AMF-2.5/NOPB?
All LM4128AMF-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMF-2.5/NOPB, 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-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128AMF-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128AMF-2.5/NOPB Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
