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Texas Instruments LM4128BQ1MF2.5/NOPB
- Part No.:
- LM4128BQ1MF2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BQ1MF2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,965
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Product details
Overview
LM4128BQ1MF2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.5 V output with ±0.2% initial accuracy, 75 ppm/°C max temperature coefficient, and 60 µA supply 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 LM4128BQ1MF2.5/NOPB datasheet, LM4128BQ1MF2.5/NOPB pinout, LM4128BQ1MF2.5/NOPB application, or LM4128BQ1MF2.5/NOPB equivalent, key selection criteria include its automotive-grade AEC-Q100 Grade 1 qualification, low dropout (400 mV at 10 mA), stability with capacitive loads up to 10 µF, and absence of required external stabilization capacitor.
Technical Context
The LM4128BQ1MF2.5/NOPB implements a band-gap-derived series reference architecture with internal enable control logic and thermal compensation. Its design eliminates need for external stabilization capacitors while maintaining stability across 0–10 µF capacitive loads and −40°C to +125°C junction temperature range.
It operates with VIN ≥ VREF + 400 mV (i.e., ≥2.9 V at 10 mA load), delivers 2.5 V output with 275 µVPP (0.1–10 Hz) noise, and provides indefinite short-circuit protection limiting output current to 75 mA. The enable pin accepts 35–65% of VIN as valid logic thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.2% initial accuracy (B grade) - ensures ≤±5 mV absolute error at 25°C for high-resolution ADC/DAC biasing |
| Tempco | 75 ppm/°C max - limits drift to ≤±18.75 mV over −40°C to +125°C span, critical for industrial sensor calibration |
| Supply Current | 60 µA typical - enables multi-year operation on coin-cell batteries in portable test equipment |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces standby power by >90% vs active mode for duty-cycled systems |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from single Li-ion cell (3.0–4.2 V) with margin for aging and discharge |
| Load Regulation | 25–120 ppm/mA - maintains ≤±0.3 mV output shift across full 0–20 mA load range, suitable for precision current sources |
| Noise (0.1–10 Hz) | 275 µVPP - supports 16-bit+ resolution in low-frequency measurement front-ends without additional filtering |
Pinout & Package
LM4128BQ1MF2.5/NOPB uses the 5-pin SOT-23 (DBV) package (Package Number DBV, R-PDSO-G5), with 1.6 mm × 2.9 mm footprint and 1.1 mm height. Pin 1 is N/C (no connect); pins are arranged top-view counterclockwise from mark dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating - no PCB trace or pad connection permitted |
| 2 (GND) | Analog ground reference | Primary return path for reference output and internal bias; requires low-impedance connection to clean analog ground plane |
| 3 (EN) | Enable control input | Active-high logic input; pulls up internally (~2 µA); drives device into 3–7 µA shutdown when <35% VIN |
| 4 (VIN) | Input supply rail | Accepts 2.9–5.5 V (VREF + 400 mV min); must be bypassed with ≥0.1 µF ceramic capacitor (CIN) per layout guidelines |
| 5 (VREF) | Precision reference output | 2.5 V regulated output capable of sourcing up to 20 mA; stable with COUT up to 10 µF; requires no mandatory output capacitor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualified | Validated for automotive applications with guaranteed operation from −40°C to +125°C junction temperature |
| No external stabilization capacitor required | Reduces BOM count and PCB area vs legacy references; simplifies layout and improves reliability |
| Stable with 0–10 µF capacitive loads | Enables direct driving of ADC sample capacitors, op-amp inputs, and DAC reference pins without phase-margin risk |
| Low ESR ceramic capacitor compatible | Supports X5R/X7R MLCCs for cost-effective, space-efficient decoupling without tantalum or electrolytic parts |
| Indefinite short-circuit protection | Withstands continuous output-to-ground fault without damage or parameter shift - critical for field-repairable systems |
Applications
| Instrumentation & Process Control | Portable Battery-Powered Equipment |
|---|---|
Use Scenario: High-accuracy pressure transducer signal conditioning in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for 24-bit sigma-delta ADC and programmable gain amplifier offset calibration. Use Value: 75 ppm/°C tempco and 50 ppm long-term stability ensure ≤0.01% full-scale error drift over 10-year deployment in uncontrolled environments. |
Use Scenario: Handheld multimeter with auto-ranging and true RMS measurement. IC Role / Device Role / Timing Role: Supplies reference voltage for dual-slope integrator and microcontroller ADC during battery-operated measurements. Use Value: 60 µA quiescent current extends alkaline AA battery life to >500 hours; 3 µA shutdown enables instant-on wake-up from sleep mode. |
| Data Acquisition Systems | Automotive Electronics |
Use Scenario: Modular DAQ card for vibration monitoring in wind turbine controllers. IC Role / Device Role / Timing Role: Reference source for simultaneous sampling of 8-channel 16-bit SAR ADCs with synchronized trigger. Use Value: 275 µVPP low-frequency noise prevents degradation of dynamic range below 100 dB SNR at 1 kSPS. |
Use Scenario: Engine control unit (ECU) sensor interface for oxygen and knock detection. IC Role / Device Role / Timing Role: Precision bias for analog front-end amplifiers and ADCs measuring wideband sensor signals under engine bay thermal stress. Use Value: AEC-Q100 Grade 1 qualification and −40°C to +125°C operation guarantee compliance with ISO 16750-4 automotive environmental requirements. |
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 max tempco, 50 µA IQ, SOT-23-3 - no enable pin, 3-pin package | Lacks shutdown control; unsuitable where power cycling or ultra-low standby current is required | Select when board space is constrained and enable functionality is unnecessary |
| MAX6025BEUR+T | 2.5 V, ±0.15% initial accuracy, 50 ppm/°C max tempco, 35 µA IQ, SOT-23-5 - includes enable, but not AEC-Q100 qualified | Superior accuracy/tempco, but lacks automotive qualification; limited to commercial/industrial use | Select for higher-precision non-automotive designs where TI's Grade B tolerance is insufficient |
Compared with REF3025AIDBZR and MAX6025BEUR+T, LM4128BQ1MF2.5/NOPB uniquely combines AEC-Q100 Grade 1 qualification, integrated enable, and 75 ppm/°C tempco in a 5-pin SOT-23 - making it the only drop-in solution for automotive-grade portable instrumentation requiring both precision and low-power control.
Availability
LM4128BQ1MF2.5/NOPB is available at Aetrix Electronics and suitable for instrumentation & process control, portable battery-powered equipment, and automotive electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128BQ1MF2.5/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-qualified components.
LM4128BQ1MF2.5/NOPB belongs to TI's LM4128Q automotive-qualified voltage reference family, designed specifically for high-reliability applications demanding precision, low power, and robust operation in harsh thermal and electrical environments.
FAQ
What is the operating temperature range for LM4128BQ1MF2.5/NOPB?
The LM4128BQ1MF2.5/NOPB is rated for −40°C to +125°C junction temperature and is AEC-Q100 Grade 1 qualified, meaning it meets automotive reliability standards for operation across this full range. This specification is validated per TI's production testing and applies to all electrical parameters unless otherwise noted in the datasheet. LM4128BQ1MF2.5/NOPB maintains its ±0.2% initial accuracy and 75 ppm/°C tempco across this span.
Does LM4128BQ1MF2.5/NOPB require an external output capacitor?
No, LM4128BQ1MF2.5/NOPB is stable without an output capacitor and does not require one for basic operation. However, adding a 0.1–10 µF ceramic capacitor (COUT) between VREF and GND improves load transient response - especially during rapid current steps - and reduces output noise. The datasheet confirms stability with up to 10 µF COUT, and CIN ≥ COUT is recommended if COUT is used. LM4128BQ1MF2.5/NOPB remains stable even with no COUT installed.
What is the minimum input voltage required for LM4128BQ1MF2.5/NOPB to regulate at 2.5 V?
The minimum input voltage for LM4128BQ1MF2.5/NOPB is VREF + 400 mV = 2.9 V at 10 mA load, per the dropout specification. At lighter loads (e.g., 1 mA), dropout drops to ~200 mV, allowing regulation down to ~2.7 V. Input voltage must not exceed 5.5 V. Operation below 2.9 V at full load causes output voltage to fall out of regulation; LM4128BQ1MF2.5/NOPB will not latch or fail but simply track VIN minus dropout.
How does the enable pin (EN) function on LM4128BQ1MF2.5/NOPB?
The EN pin on LM4128BQ1MF2.5/NOPB is an active-high digital control input with internal ~2 µA pull-up. When EN ≥65% of VIN, the device operates normally; when EN ≤35% of VIN, it enters shutdown mode drawing only 3–7 µA. EN may be tied directly to VIN for always-on operation or driven by a microcontroller GPIO. Floating EN is acceptable due to internal pull-up, but not recommended for noise-sensitive designs. LM4128BQ1MF2.5/NOPB does not operate correctly if EN exceeds VIN.
Is LM4128BQ1MF2.5/NOPB pin-compatible with other LM4128 variants?
Yes, all LM4128 and LM4128Q variants - including LM4128BQ1MF2.5/NOPB - share identical 5-pin SOT-23 (DBV) packaging and pinout (N/C, GND, EN, VIN, VREF). Voltage options (1.8 V to 4.096 V) and grade options (A/B/C/D) do not affect mechanical or electrical pin compatibility. Layouts designed for any LM4128Q part can accommodate LM4128BQ1MF2.5/NOPB without modification, though system-level validation of reference accuracy and noise performance is still required.
LM4128BQ1MF2.5/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:
- ±0.2%
- 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
LM4128BQ1MF2.5/NOPB FAQ
1.How can I place an order for LM4128BQ1MF2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BQ1MF2.5/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 LM4128BQ1MF2.5/NOPB reliable?
The price and inventory of LM4128BQ1MF2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BQ1MF2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BQ1MF2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BQ1MF2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BQ1MF2.5/NOPB?
LM4128BQ1MF2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BQ1MF2.5/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 LM4128BQ1MF2.5/NOPB?
For technical support, including LM4128BQ1MF2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BQ1MF2.5/NOPB requirements.
6.How does Aetrix verify that LM4128BQ1MF2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BQ1MF2.5/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 LM4128BQ1MF2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BQ1MF2.5/NOPB?
All LM4128BQ1MF2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BQ1MF2.5/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 LM4128BQ1MF2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128BQ1MF2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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