My Inquiry
My Account
Texas Instruments LM4128DMF-2.5
- Part No.:
- LM4128DMF-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMF-2.5.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,453
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4128DMF-2.5 from Texas Instruments (formerly National Semiconductor) is a precision micropower series voltage reference in SOT-23-5 package, delivering 2.5 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, and an enable pin supporting 3 µA shutdown mode - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128DMF-2.5 datasheet, LM4128DMF-2.5 pinout, LM4128DMF-2.5 application, or LM4128DMF-2.5 equivalent, key selection considerations include its grade-D accuracy and tempco trade-off, SOT-23-5 footprint constraints, enable-controlled power gating, capacitive load stability up to 10 µF, and compatibility with low-ESR ceramic bypassing.
Technical Context
The LM4128DMF-2.5 implements a band-gap-derived series reference architecture with internal enable logic and short-circuit protection. Its design eliminates need for external stabilization capacitors while maintaining stability with capacitive loads ≤10 µF and supports input voltages from (VREF + 400 mV) to 5.5 V.
It operates across −40°C to +125°C junction temperature, delivers up to 20 mA output current, and achieves 275 µVPP (0.1–10 Hz) output noise. The enable pin accepts logic-level control referenced to VIN, with VIH ≥ 65% VIN and VIL ≤ 35% VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±1.0% initial accuracy at 25°C - defines absolute DC reference tolerance for 12-bit ADC biasing or DAC calibration. |
| Temperature Coefficient | 100 ppm/°C max - limits drift to ±300 µV over full −40°C to +125°C range, suitable for industrial-grade sensor signal chains. |
| Quiescent Current | 60 µA typical - enables multi-year operation from coin-cell batteries in portable test equipment. |
| Dropout Voltage | 400 mV max at 10 mA - allows operation from 2.9 V supply, compatible with single Li-ion or dual alkaline cells. |
| Shutdown Current | 3 µA typical when EN = 0 V - reduces standby power by >95% versus active mode for duty-cycled measurement systems. |
| Output Noise | 275 µVPP (0.1–10 Hz) - supports <16-bit effective resolution in precision data loggers without additional filtering. |
| Load Regulation | 120 ppm/mA max - ensures <±300 µV shift across 0–20 mA load, critical for programmable current source applications. |
Pinout & Package
SOT-23-5 package (NS package number MF05A), 1.6 mm × 2.9 mm footprint, 0.95 mm height, gull-wing leads, JEDEC MO-178 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must remain unconnected and floating per datasheet - soldering or routing to ground/VIN causes undefined behavior. |
| 2 | GND | Analog ground reference; requires low-impedance connection to system AGND plane to minimize noise coupling into reference output. |
| 3 | EN | Active-high enable input; pulled internally to VIN via ~2 µA current source - may be tied to VIN for always-on operation or driven by microcontroller GPIO. |
| 4 | VIN | Input supply rail; must exceed VREF + 400 mV (≥2.9 V) and stay ≤5.5 V - undersupply causes regulation loss; oversupply risks absolute maximum violation. |
| 5 | VREF | Precision 2.5 V output; capable of sourcing up to 20 mA - requires local 0.1 µF minimum X5R/X7R ceramic bypass capacitor if no COUT is used. |
Key Features
| Feature | Design Value |
|---|---|
| Grade-D precision | ±1.0% initial accuracy and 100 ppm/°C tempco - balances cost and performance for non-critical industrial sensing where A/B-grade references are over-specified. |
| Capacitive load stability | Stable with up to 10 µF output capacitance - eliminates need for external compensation networks and simplifies layout in space-constrained PCBs. |
| Enable-controlled shutdown | Reduces supply current to 3 µA - enables microcontroller-gated power cycling in portable multimeters or handheld analyzers. |
| Micropower operation | 60 µA quiescent current - extends battery life in always-on monitoring nodes powered by CR2032 or AA cells. |
| Short-circuit protection | Indefinite 75 mA current limit - prevents damage during probe misconnection or PCB assembly errors in test fixtures. |
Applications
| Instrumentation & Process Control | Portable Battery-Powered Equipment |
|---|---|
Use Scenario: High-accuracy analog front-end for 4–20 mA loop-powered transmitters in factory automation. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for DAC output scaling and ADC input full-scale calibration. Use Value: Enables ±0.5% total system accuracy over temperature without recalibration, meeting IEC 61000-6-2 immunity requirements. |
Use Scenario: Handheld digital multimeter with auto-ranging and true RMS conversion. IC Role / Device Role / Timing Role: Supplies reference voltage for 16-bit sigma-delta ADC and internal precision shunt regulator. Use Value: Delivers 275 µVPP low-frequency noise and 100 ppm/°C drift - sufficient for 4½-digit resolution across 0–50°C operating range. |
| Data Acquisition Systems | Automotive & Industrial Electronics |
Use Scenario: Modular DAQ module for vibration monitoring in predictive maintenance gateways. IC Role / Device Role / Timing Role: Reference source for simultaneous sampling of multiple analog sensor channels (thermocouples, strain gauges). Use Value: Supports 20 mA drive capability and 120 ppm/mA load regulation - maintains channel-to-channel matching under dynamic sensor excitation loads. |
Use Scenario: Onboard diagnostics (OBD-II) sensor interface in engine control units. IC Role / Device Role / Timing Role: Precision reference for oxygen sensor signal conditioning and fuel injector current sense calibration. Use Value: Qualified to −40°C to +125°C junction temperature with 100 ppm/°C tempco - meets AEC-Q100 Grade 1 thermal requirements without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-3 - no enable pin, lower noise (12 µVPP), higher precision grade. | Requires external enable circuitry if shutdown needed; better suited for high-resolution medical ADCs than cost-sensitive industrial sensors. | Select when tighter initial accuracy and lower noise outweigh need for integrated enable functionality. |
| MAX6025AEUR+T | 2.5 V, ±0.1% initial accuracy, 25 ppm/°C, 65 µA IQ, SOT-23-5 - includes enable pin, superior tempco, but higher cost and longer lead time. | Supports same pinout and enable logic as LM4128DMF-2.5 but offers automotive-grade reliability and enhanced long-term stability (30 ppm/1k hrs). | Choose for mission-critical automotive or aerospace designs requiring AEC-Q200 qualification and <50 ppm/°C drift. |
Compared with REF3025AIDBZR and MAX6025AEUR+T, the LM4128DMF-2.5 provides the lowest-cost SOT-23-5 solution with integrated enable and grade-D specs - optimal for volume industrial instrumentation where ±1.0% accuracy is acceptable and shutdown power savings are essential.
Availability
LM4128DMF-2.5 is available at Aetrix Electronics and suitable for instrumentation & process control, portable battery-powered equipment, and automotive & industrial electronics requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128DMF-2.5 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 legacy product lines including precision analog ICs. TI is a global leader in analog and embedded processing solutions.
The LM4128 series belongs to TI's precision voltage reference portfolio, designed specifically for space-constrained, low-power applications demanding stable DC references across wide temperature ranges - especially in portable test gear and industrial sensor interfaces.
FAQ
What is the maximum input voltage for LM4128DMF-2.5?
The LM4128DMF-2.5 supports a maximum input voltage of 5.5 V. Exceeding this violates absolute maximum ratings and may cause permanent damage. Input must also remain ≥2.9 V (VREF + 400 mV) to maintain regulation at 10 mA load - operation below this threshold results in unregulated output.
Does LM4128DMF-2.5 require an input capacitor?
Yes - a minimum 0.1 µF X5R or X7R ceramic capacitor is required between VIN and GND for stable operation. If an output capacitor is used, CIN must be ≥ COUT. Larger input capacitors (4.7–22 µF) reduce startup overshoot and improve PSRR, especially in noisy supply environments.
Can LM4128DMF-2.5 drive a 10 µF capacitive load?
Yes - the LM4128DMF-2.5 is explicitly characterized for stability with capacitive loads up to 10 µF. This eliminates need for series isolation resistors or external compensation, enabling direct connection to large bulk capacitors in portable equipment power domains.
What is the shutdown current of LM4128DMF-2.5?
The LM4128DMF-2.5 draws 3 µA typical supply current in shutdown mode when the EN pin is held at 0 V. This value is guaranteed up to 7 µA maximum across temperature, enabling ultra-low-power sleep states in battery-operated data loggers and wireless sensor nodes.
Is LM4128DMF-2.5 qualified for automotive applications?
No - LM4128DMF-2.5 is the commercial-grade (non-Q) variant. For automotive use, select LM4128DQ1MF2.5 (AEC-Q100 Grade 1 qualified), which shares identical electrical specs but undergoes enhanced manufacturing screening and thermal stress validation per automotive reliability standards.
LM4128DMF-2.5 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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 100ppm/°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
LM4128DMF-2.5 FAQ
1.How can I place an order for LM4128DMF-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMF-2.5 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-2.5 reliable?
The price and inventory of LM4128DMF-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128DMF-2.5 is usually 5 days.
3.What payment methods are accepted for LM4128DMF-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMF-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMF-2.5?
LM4128DMF-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMF-2.5 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-2.5?
For technical support, including LM4128DMF-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMF-2.5 requirements.
6.How does Aetrix verify that LM4128DMF-2.5 is sourced from the original manufacturer or authorized distributors?
All LM4128DMF-2.5 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-2.5 meets industry standards.
7.What is the process for return or replacement of LM4128DMF-2.5?
All LM4128DMF-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMF-2.5, 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-2.5 part is unused and in its original packaging.
Return procedure for LM4128DMF-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128DMF-2.5 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…
