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Texas Instruments LM4128DQ1MF2.5/NOPB
- Part No.:
- LM4128DQ1MF2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DQ1MF2.5/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,782
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Product details
Overview
LM4128DQ1MF2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.5 V output with ±1.0% initial accuracy, 100 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 battery-powered instrumentation and automotive sensor signal conditioning.
For engineers reviewing the LM4128DQ1MF2.5/NOPB datasheet, LM4128DQ1MF2.5/NOPB pinout, LM4128DQ1MF2.5/NOPB application, or LM4128DQ1MF2.5/NOPB equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification, dropout voltage of ≤400 mV at 10 mA, stability with capacitive loads up to 10 µF, and absence of required external output capacitor.
Technical Context
The LM4128DQ1MF2.5/NOPB uses a band-gap–based series reference architecture with internal enable logic and no external compensation requirement. Its design eliminates need for COUT while maintaining stability with 0–10 µF capacitive loads and ensures monotonic turn-on behavior under brown-out conditions.
It operates across VIN = VREF + 400 mV to 5.5 V, supports force-sense configurations via separate VREF and GND paths, and delivers low 0.1–10 Hz noise (275 µVPP) - critical for high-resolution ADC biasing and precision regulator feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±1.0% initial accuracy (D-grade) - sets absolute scaling for 12-bit+ data acquisition systems |
| Tempco | ≤100 ppm/°C over −40°C to +125°C - enables stable operation in automotive under-hood environments |
| Supply Current | 60 µA typical - allows multi-year battery life in portable gas sensors and wireless transmitters |
| Shutdown Current | 3–7 µA with EN = 0 V - supports ultra-low-power wake-on-event architectures |
| Dropout Voltage | ≤400 mV at 10 mA load - permits use with single-cell Li-ion (3.0–3.6 V) or 3.3 V rails |
| Load Drive | Up to 20 mA output - sufficient to drive SAR ADC reference inputs and op-amp buffers without gain error |
| Noise (0.1–10 Hz) | 275 µVPP - limits quantization uncertainty to <0.5 LSB in 16-bit 2.5 V full-scale systems |
Pinout & Package
LM4128DQ1MF2.5/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, JEDEC MO-178AA compliant, and rated for −40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must remain floating - avoids parasitic leakage paths affecting reference accuracy |
| 2 | GND | Analog ground return - requires dedicated low-impedance PCB pour to minimize PSRR degradation |
| 3 | EN | Active-high enable input - accepts 65% of VIN as minimum high level; internal 2 µA pull-up allows direct tie-to-VIN |
| 4 | VIN | Input supply rail - must exceed VREF + 400 mV; supports up to 5.5 V with 350 mW max power dissipation |
| 5 | VREF | Precision 2.5 V output - low-noise, low-drift node requiring local 0.1 µF ceramic bypass (CIN) on VIN |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualified | Validated for automotive applications with guaranteed −40°C to +125°C operation and stress testing per automotive reliability standards |
| No external COUT required | Stable with 0–10 µF capacitive loads - eliminates BOM cost and layout area for output filter capacitor |
| Low ESR ceramic capacitor compatible | Works with X5R/X7R MLCCs - avoids instability risks associated with tantalum or electrolytic output caps |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault - prevents thermal runaway and enables robust field-deployed designs |
| Thermal hysteresis ≤75 ppm | Ensures repeatable 2.5 V output after thermal cycling - critical for calibration-critical test equipment |
Applications
| Portable Battery-Powered Instrumentation | Automotive Sensor Signal Conditioning |
|---|---|
Use Scenario: Handheld multimeter with 16-bit sigma-delta ADC and lithium coin-cell power source. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC conversion and microcontroller analog peripherals. Use Value: 60 µA quiescent current extends battery life beyond 5 years; ±1.0% accuracy meets Class II meter requirements per IEC 61000-4-30. |
Use Scenario: Engine control unit (ECU) measuring exhaust O₂ sensor output in high-temperature under-hood environment. IC Role / Device Role / Timing Role: Supplies precision bias to op-amp front-end amplifying narrow-band sensor signals. Use Value: AEC-Q100 Grade 1 rating and ≤100 ppm/°C tempco ensure consistent measurement accuracy across −40°C cold start to +125°C operating range. |
| Industrial Data Acquisition Modules | Medical Patient Monitoring Devices |
Use Scenario: DIN-rail mounted PLC analog input module acquiring 4–20 mA loop signals with 14-bit resolution. IC Role / Device Role / Timing Role: Serves as master reference for multi-channel SAR ADC and isolated DAC feedback paths. Use Value: 275 µVPP low-frequency noise limits effective resolution loss to <0.3 LSB; load regulation ≤120 ppm/mA maintains linearity across channel switching. |
Use Scenario: Portable ECG monitor with dry-electrode front-end and rechargeable Li-poly battery. IC Role / Device Role / Timing Role: Generates clean 2.5 V reference for instrumentation amplifier and anti-aliasing filter stages. Use Value: Shutdown mode reduces system standby current to <5 µA; long-term stability of 50 ppm/1000 hrs preserves calibration integrity between clinical recalibrations. |
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, 0.9 µA IQ - higher precision but 3× cost and no enable pin | Used in metrology-grade calibrators where 0.06% accuracy justifies premium cost and board space | Select when sub-10 ppm/°C drift and <100 µVPP noise are mandatory; avoid if shutdown control or cost sensitivity exists |
| ADR3425ARJZ-R7 | 2.5 V, 0.1% initial accuracy, 10 ppm/°C tempco, 3.5 µA IQ - lower tempco than LM4128DQ1MF2.5/NOPB but no AEC-Q100 qualification | Preferred in industrial IoT gateways requiring extended temperature stability but not automotive certification | Choose for non-automotive applications needing tighter tempco; reject if AEC-Q100 compliance or indefinite short-circuit protection is required |
Compared with MAX6126AASA25+ and ADR3425ARJZ-R7, LM4128DQ1MF2.5/NOPB uniquely balances AEC-Q100 Grade 1 qualification, integrated enable functionality, and cost-effective D-grade accuracy - making it optimal for production automotive and industrial modules where reliability, power control, and BOM efficiency are jointly prioritized.
Availability
LM4128DQ1MF2.5/NOPB is available at Aetrix Electronics and suitable for automotive sensor modules, portable instrumentation, and industrial data loggers requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LM4128DQ1MF2.5/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 over 90 years of innovation in precision analog ICs and automotive-grade components.
LM4128DQ1MF2.5/NOPB belongs to TI's precision voltage reference product line, engineered specifically for space-constrained, low-power, high-reliability applications in automotive, industrial, and portable medical systems.
FAQ
What is the maximum input voltage for LM4128DQ1MF2.5/NOPB?
The LM4128DQ1MF2.5/NOPB supports a maximum input voltage of 5.5 V across its operating temperature range. This limit is specified in the Absolute Maximum Ratings table and applies regardless of load or enable state. Exceeding 5.5 V may cause permanent damage. The device requires VIN ≥ VREF + 400 mV (i.e., ≥2.9 V at 2.5 V output) for proper regulation, and operation within 2.9–5.5 V ensures full specification compliance for all electrical parameters including dropout, line regulation, and noise performance.
Does LM4128DQ1MF2.5/NOPB require an external output capacitor (COUT)?
No, LM4128DQ1MF2.5/NOPB does not require an external output capacitor. Its internal design ensures stability with capacitive loads from 0 to 10 µF, eliminating the need for COUT in most applications. A COUT may be added to improve load transient response when switching between light and heavy loads, but it is optional and not required for basic regulation. The datasheet explicitly states "the capacitor COUT is optional" and confirms stability without it - unlike many older references that mandate COUT for phase margin.
What is the function of Pin 1 (N/C) on LM4128DQ1MF2.5/NOPB?
Pin 1 of LM4128DQ1MF2.5/NOPB is a no-connect (N/C) terminal and must remain electrically floating - it is not bonded internally and has no circuit connection. Leaving it unconnected avoids introducing parasitic leakage paths or unintended coupling that could degrade reference accuracy or increase noise. The datasheet explicitly instructs users to "leave floating"; soldering or routing this pin introduces risk of mechanical stress or contamination-induced parameter shift, especially in high-reliability automotive applications.
How does the enable pin (EN) of LM4128DQ1MF2.5/NOPB operate?
The EN pin of LM4128DQ1MF2.5/NOPB is an active-high digital control input with internal 2 µA pull-up current. It asserts normal operation when voltage exceeds 65% of VIN (VIH), and enters 3–7 µA shutdown mode when pulled below 35% of VIN (VIL). The pin may be tied directly to VIN for always-on operation or driven by a GPIO. Unlike open-drain enable inputs, EN does not require an external pull-up resistor - its internal pull-up allows simple connection to microcontroller outputs or manual switches without additional components.
Is LM4128DQ1MF2.5/NOPB qualified for automotive applications?
Yes, LM4128DQ1MF2.5/NOPB is AEC-Q100 Grade 1 qualified and manufactured on an automotive-grade flow. It is explicitly designated as LM4128DQ (Q-suffix) and certified for operation from −40°C to +125°C junction temperature. The "Q" suffix denotes automotive qualification, and TI's packaging documentation confirms LM4128DQ1MF2.5/NOPB meets stress testing, failure analysis, and traceability requirements defined in AEC-Q100 Rev H. This makes it suitable for engine control, ADAS sensors, and body electronics where automotive reliability is mandatory.
LM4128DQ1MF2.5/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:
- ±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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128DQ1MF2.5/NOPB FAQ
1.How can I place an order for LM4128DQ1MF2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DQ1MF2.5/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 LM4128DQ1MF2.5/NOPB reliable?
The price and inventory of LM4128DQ1MF2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128DQ1MF2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DQ1MF2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DQ1MF2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DQ1MF2.5/NOPB?
LM4128DQ1MF2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DQ1MF2.5/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 LM4128DQ1MF2.5/NOPB?
For technical support, including LM4128DQ1MF2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DQ1MF2.5/NOPB requirements.
6.How does Aetrix verify that LM4128DQ1MF2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DQ1MF2.5/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 LM4128DQ1MF2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DQ1MF2.5/NOPB?
All LM4128DQ1MF2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DQ1MF2.5/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 LM4128DQ1MF2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128DQ1MF2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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