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Texas Instruments LM4128AQ1MFX2.5/NOPB
- Part No.:
- LM4128AQ1MFX2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AQ1MFX2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,347
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Product details
Overview
LM4128AQ1MFX2.5/NOPB from Texas Instruments is an AEC-Q100 Grade 1 qualified, precision micropower series voltage reference in a 5-pin SOT-23 package, delivering 2.5 V output with ±0.1% initial accuracy, 75 ppm/°C max temperature coefficient, and 60 µA supply current. It enables battery-powered instrumentation requiring stable, low-drift reference voltage under automotive-grade thermal stress (−40°C to +125°C).
For engineers reviewing the LM4128AQ1MFX2.5/NOPB datasheet, LM4128AQ1MFX2.5/NOPB pinout, LM4128AQ1MFX2.5/NOPB application, or LM4128AQ1MFX2.5/NOPB equivalent, key selection criteria include its enable-controlled shutdown (3 µA), 400 mV dropout at 10 mA, stability with up to 10 µF capacitive loads, and automotive qualification for safety-critical sensor signal conditioning and ADC biasing.
Technical Context
The LM4128AQ1MFX2.5/NOPB implements a band-gap–based series reference architecture with internal enable logic and no external stabilization capacitor required. Its design ensures monotonic turn-on, indefinite short-circuit protection (75 mA limit), and operation across VIN = VREF + 400 mV to 5.5 V.
It features rail-to-rail enable input thresholds (VIH = 65% VIN, VIL = 35% VIN), low 0.1–10 Hz noise (275 µVPP), and load regulation of 25–120 ppm/mA - all specified over −40°C to +125°C junction temperature.
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+ ADC reference applications |
| Tempco | 75 ppm/°C max - limits drift to ≤187.5 ppm (0.047 mV) over −40°C to +125°C span |
| Supply Current | 60 µA typical - supports >1-year battery life in 10 µA-sleep systems with periodic reference activation |
| Shutdown Current | 3–7 µA with EN = 0 V - enables ultra-low-power duty-cycled sensing without external switch |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from 2.675 V input, compatible with single-cell LiFePO₄ or dual-cell alkaline supplies |
| Noise (0.1–10 Hz) | 275 µVPP - contributes <0.011 LSB error to 16-bit 2.5 V full-scale ADCs |
| Load Current | Up to 20 mA - drives multiple op-amp bias networks or SAR ADC reference inputs directly |
Pinout & Package
LM4128AQ1MFX2.5/NOPB uses the 5-pin SOT-23 (DBV) package per JEDEC MO-178AB, with 0.95 mm pitch and 2.9 mm × 1.6 mm footprint. Pin 1 is N/C (no connect); pins are arranged top-view as N/C, GND, EN, VIN, VREF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must remain unconnected and floating - no routing or soldering allowed |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference current; requires low-impedance connection to system AGND plane |
| Pin 3 (EN) | Active-high enable control | Pulled internally to VIN via ~2 µA source; drives high (>65% VIN) to activate, low (<35% VIN) to enter 3–7 µA shutdown |
| Pin 4 (VIN) | Input supply rail | Accepts 2.9 V to 5.5 V; must exceed VREF by ≥400 mV at 10 mA load for guaranteed regulation |
| Pin 5 (VREF) | Precision output terminal | Delivers regulated 2.5 V; stable with 0–10 µF ceramic capacitive loads; requires CIN ≥0.1 µF on VIN |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive ambient temperatures (−40°C to +125°C) and lifetime reliability in engine control, ADAS sensors, and body electronics |
| No external stabilization capacitor required | Eliminates BOM cost and layout area while maintaining stability with 10 µF output capacitance - simplifies PCB design for space-constrained modules |
| Low dropout (175 mV typ) | Enables direct regulation from low-voltage rails like 3.3 V LDO outputs or partially discharged batteries without headroom loss |
| Indefinite short-circuit protection | Self-limits output current to 75 mA during fault conditions - prevents thermal runaway and enables robust field deployment |
| Stable with low-ESR ceramic capacitors | Supports X5R/X7R MLCCs down to 0.1 µF input and any value ≤10 µF output - avoids costly tantalum or electrolytic alternatives |
Applications
| Automotive Sensor Signal Conditioning | Portable Data Acquisition |
|---|---|
|
Use Scenario: High-accuracy temperature, pressure, and position sensing in engine control units and battery management systems. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for 16-bit delta-sigma ADCs digitizing analog sensor outputs. Use Value: Grade A accuracy and 75 ppm/°C tempco ensure ≤0.02% total error over full automotive temperature range, meeting ASIL-B functional safety requirements. |
Use Scenario: Handheld multimeters, environmental monitors, and portable oscilloscopes powered by coin cells or USB. IC Role / Device Role / Timing Role: Supplies precision reference to SAR ADCs and programmable gain amplifiers during measurement bursts. Use Value: 60 µA operating current and 3 µA shutdown mode extend battery life to >2 years in sleep-wake duty cycles. |
| Industrial Process Control Transmitters | Medical Vital Sign Monitors |
|
Use Scenario: 4–20 mA loop-powered transmitters for flow, level, and pH measurement in factory automation. IC Role / Device Role / Timing Role: Generates accurate excitation voltage for RTDs and bridge sensors, and reference for DACs driving current loops. Use Value: Load regulation of 25 ppm/mA and line regulation of 50 ppm/V minimize output error across varying loop loads and supply voltages. |
Use Scenario: ECG, pulse oximeter, and blood glucose meters requiring clinical-grade measurement repeatability. IC Role / Device Role / Timing Role: Serves as primary reference for analog front-end ADCs capturing biopotential signals with sub-microvolt resolution. Use Value: 275 µVPP (0.1–10 Hz) noise and 50 ppm long-term stability over 1000 hours support FDA-cleared accuracy specifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AASA25+ | 2.5 V, ±0.06% initial accuracy, 3 ppm/°C tempco, 12 µA supply current, SO-8 package | Higher precision and lower noise, but larger footprint and no enable pin - suited for lab-grade instruments, not space-constrained automotive modules | Select when ultra-low drift and noise outweigh size and power constraints; verify SO-8 layout compatibility |
| ADR3425ARJZ-R7 | 2.5 V, ±0.1% initial accuracy, 10 ppm/°C tempco, 120 µA supply current, SOT-23-5 package, no enable pin | Superior tempco and AEC-Q200 qualification, but lacks shutdown mode and draws double the quiescent current | Prefer for non-battery applications needing tighter thermal stability; avoid where enable-controlled power gating is mandatory |
Compared with MAX6126AASA25+ and ADR3425ARJZ-R7, LM4128AQ1MFX2.5/NOPB uniquely balances automotive qualification, enable-controlled micropower operation, and SOT-23 footprint - making it optimal for cost-sensitive, space-limited, and battery-aware automotive and industrial edge nodes.
Availability
LM4128AQ1MFX2.5/NOPB is available at Aetrix Electronics and suitable for automotive sensor modules, portable test equipment, and industrial transmitters requiring stable component supply with full traceability and extended lifecycle support.
Supply support for LM4128AQ1MFX2.5/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 ICs and automotive-grade components.
LM4128AQ1MFX2.5/NOPB belongs to TI's precision voltage reference product line, engineered specifically for high-accuracy, low-power, and thermally robust operation in automotive and industrial environments.
FAQ
What is the maximum input voltage for LM4128AQ1MFX2.5/NOPB?
The absolute maximum input voltage for LM4128AQ1MFX2.5/NOPB is 6 V, but the recommended operating maximum is 5.5 V. Exceeding 5.5 V risks violating the Absolute Maximum Ratings and may cause permanent damage. For reliable operation, VIN must also be ≥2.9 V (VREF + 400 mV) at 10 mA load to maintain regulation. Always observe both upper and lower bounds in system design.
Does LM4128AQ1MFX2.5/NOPB require an input capacitor?
Yes, LM4128AQ1MFX2.5/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) connected between VIN and GND. This capacitor is mandatory for stability - omitting it risks oscillation or erratic output behavior. When using an output capacitor (COUT), CIN must be ≥ COUT. X5R or X7R dielectrics are recommended for low ESR and temperature stability.
What does the 'Q' suffix in LM4128AQ1MFX2.5/NOPB indicate?
The 'Q' suffix in LM4128AQ1MFX2.5/NOPB denotes AEC-Q100 Grade 1 qualification, certifying the device for automotive applications with operating junction temperature range of −40°C to +125°C. The 'A' indicates Grade A initial accuracy (±0.1%), '1MF' specifies the SOT-23 (DBV) package, and 'X2.5' identifies the 2.5 V output voltage option.
Can LM4128AQ1MFX2.5/NOPB drive a 10 µF output capacitor?
Yes, LM4128AQ1MFX2.5/NOPB is explicitly designed to remain stable with capacitive loads up to 10 µF, including ceramic, tantalum, and electrolytic types. Driving 10 µF improves load transient response but increases turn-on time (up to 78.8 µs). No series resistance or isolation is needed - the device integrates internal compensation for this condition.
Is LM4128AQ1MFX2.5/NOPB pin-compatible with other LM4128 variants?
Yes, all LM4128x variants - including LM4128AQ1MFX2.5/NOPB, LM4128AMF-2.5/NOPB, and LM4128BQ1MFX2.5/NOPB - share identical 5-pin SOT-23 (DBV) pinout and mechanical footprint. Differences are limited to grade (A/B/C/D), automotive qualification (Q vs non-Q), and packaging (tape-and-reel vs cut tape), enabling drop-in replacement within the same voltage option and package format.
LM4128AQ1MFX2.5/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128AQ1MFX2.5/NOPB FAQ
1.How can I place an order for LM4128AQ1MFX2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AQ1MFX2.5/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 LM4128AQ1MFX2.5/NOPB reliable?
The price and inventory of LM4128AQ1MFX2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128AQ1MFX2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AQ1MFX2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AQ1MFX2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AQ1MFX2.5/NOPB?
LM4128AQ1MFX2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AQ1MFX2.5/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 LM4128AQ1MFX2.5/NOPB?
For technical support, including LM4128AQ1MFX2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AQ1MFX2.5/NOPB requirements.
6.How does Aetrix verify that LM4128AQ1MFX2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AQ1MFX2.5/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 LM4128AQ1MFX2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AQ1MFX2.5/NOPB?
All LM4128AQ1MFX2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AQ1MFX2.5/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 LM4128AQ1MFX2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128AQ1MFX2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128AQ1MFX2.5/NOPB Tags
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