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Texas Instruments LM4128DMFX-2.5/NOPB
- Part No.:
- LM4128DMFX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMFX-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,886
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Product details
Overview
LM4128DMFX-2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.5 V output with ±0.5% initial accuracy (C-grade), 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 portable data acquisition systems.
For engineers reviewing the LM4128DMFX-2.5/NOPB datasheet, LM4128DMFX-2.5/NOPB pinout, LM4128DMFX-2.5/NOPB application, or LM4128DMFX-2.5/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), line regulation (50 ppm/V), load regulation (25–120 ppm/mA), 0.1–10 Hz noise (275 µVPP), and stability with capacitive loads up to 10 µF without external compensation.
Technical Context
The LM4128DMFX-2.5/NOPB implements a band-gap-based series voltage reference architecture with internal enable logic and low-quiescent-current biasing. Its design eliminates need for external stabilization capacitors while maintaining stability with output capacitance up to 10 µF, enabling robust operation in space-constrained layouts.
It operates as a two-terminal active reference: VIN supplies regulated current to the internal core, EN controls activation via CMOS-compatible thresholds (VIL ≤35% VIN, VIH ≥65% VIN), and VREF delivers a precise 2.5 V output referenced to GND. The N/C pin (Pin 1) must remain unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.5% initial accuracy (C-grade) - ensures ≤12.5 mV absolute error at 25°C for 12-bit ADC reference scaling |
| Tempco | 100 ppm/°C max - contributes ≤0.3125 mV drift over −40°C to +125°C operating range |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA average-power IoT sensor nodes |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces standby power by >90% vs active mode |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from 2.675 V input (e.g., single Li-ion cell) |
| Output Noise | 275 µVPP (0.1–10 Hz) - supports <16-bit effective resolution in precision DAC/ADC circuits |
| Load Capability | 20 mA max - drives multiple op-amp bias networks or SAR ADC reference inputs simultaneously |
Pinout & Package
LM4128DMFX-2.5/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 and must be left floating; thermal pad is not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Internally unconnected; must remain unattached on PCB to avoid parasitic coupling |
| 2 (GND) | Analog ground reference | Return path for reference core and enable circuitry; requires low-impedance connection to system AGND |
| 3 (EN) | Digital enable control | Active-high logic input; pulls up internally (~2 µA); drives into high-impedance state when disabled |
| 4 (VIN) | Unregulated input supply | Must exceed VREF + 400 mV (≥2.9 V); max 5.5 V; bypassed with ≥0.1 µF ceramic capacitor |
| 5 (VREF) | Precision output terminal | Delivers stable 2.5 V; supports optional COUT (≤10 µF) to improve transient response |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to ≤7 µA, enabling firmware-managed power gating in portable devices |
| Capacitor-free stability | Operates stably without output capacitor and supports up to 10 µF COUT - simplifies layout and avoids ESR sensitivity |
| Low dropout operation | Functions down to VIN = VREF + 175 mV (at light loads), extending usable battery voltage range |
| Wide temperature range | Specified from −40°C to +125°C junction temperature - suitable for automotive under-hood and industrial control environments |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault conditions, preventing thermal runaway and enabling safe recovery |
Applications
| Portable Data Loggers | Battery-Powered Medical Sensors |
|---|---|
Use Scenario: Continuous 16-bit analog-to-digital conversion of biopotential signals (ECG, EEG) in handheld diagnostic tools powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for sigma-delta ADCs and programmable gain amplifiers, directly determining full-scale measurement accuracy. Use Value: 100 ppm/°C tempco and 275 µVPP noise ensure <±0.025% FS error across operating temperature and enable sub-µV signal resolution. | Use Scenario: Low-power glucose meter or pulse oximeter requiring accurate analog front-end calibration over extended shelf life and field use. IC Role / Device Role / Timing Role: Serves as primary reference for ratiometric sensor excitation and ADC conversion, enabling traceable measurement against ISO 15197 standards. Use Value: 50 ppm long-term stability (1000 hrs) and 75 ppm thermal hysteresis minimize recalibration frequency and reduce test-time overhead. |
| Industrial PLC Analog Input Modules | Automotive Body Control Units |
Use Scenario: 4–20 mA loop-powered analog input card in factory automation systems, operating continuously at 85°C ambient. IC Role / Device Role / Timing Role: Supplies precision reference for current-to-voltage conversion and multiplexed ADC sampling across 8+ channels. Use Value: −40°C to +125°C junction rating and 20 mA drive capability support hot-plug operation and multi-channel simultaneous sampling without reference droop. | Use Scenario: Cabin temperature/humidity sensing subsystem in automotive BCM, powered from 12 V rail via LDO, requiring AEC-Q100 compliance. IC Role / Device Role / Timing Role: Reference source for microcontroller ADC measuring thermistor and capacitive humidity sensor outputs. Use Value: LM4128DMFX-2.5/NOPB's C-grade accuracy (±0.5%) and 100 ppm/°C tempco meet ASAM MCD-2 MC requirements for Class B sensors. |
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 (A-grade), 50 ppm/°C tempco, 50 µA IQ, SOT-23-3 - no enable pin, 3-pin package | Requires external enable circuitry if shutdown needed; lower noise (20 µVRMS) but fixed 3-pin footprint limits routing flexibility | Select when highest accuracy and lowest noise are prioritized over enable control and board space savings |
| MAX6126AASA25+ | 2.5 V, ±0.1% initial accuracy, 3 ppm/°C tempco, 120 µA IQ, SO-8 - laser-trimmed, higher precision, larger package | SO-8 footprint increases PCB area; higher supply current reduces battery life; superior tempco suits metrology-grade instruments | Select when ultra-low drift (<5 ppm total over temperature) justifies cost and size penalty in lab equipment or calibration standards |
Compared with REF3025AIDBZR and MAX6126AASA25+, the LM4128DMFX-2.5/NOPB offers integrated enable functionality in a compact 5-pin SOT-23, balancing moderate accuracy (±0.5%), low quiescent current (60 µA), and wide temperature operation (−40°C to +125°C) for cost-sensitive embedded systems where pin count and power gating are critical.
Availability
LM4128DMFX-2.5/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC analog input modules, and automotive body control units requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128DMFX-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 ICs and power management solutions.
The LM4128 product line delivers micropower, low-drift series voltage references optimized for space-constrained, battery-operated, and high-reliability industrial and automotive applications - emphasizing ease of use, capacitor-free stability, and wide temperature performance.
FAQ
What is the guaranteed initial accuracy of LM4128DMFX-2.5/NOPB over temperature?
The LM4128DMFX-2.5/NOPB is a C-grade device with guaranteed ±0.5% initial accuracy at 25°C. Over the full −40°C to +125°C junction temperature range, its maximum temperature coefficient is 100 ppm/°C, contributing ≤0.3125 mV additional error beyond the initial tolerance - resulting in a total worst-case output deviation of ±0.8125% relative to 2.5 V. This is confirmed in the Electrical Characteristics table for LM4128C-2.5.
Does LM4128DMFX-2.5/NOPB require an input capacitor, and what value is recommended?
Yes, LM4128DMFX-2.5/NOPB requires an input capacitor (CIN) for stable operation. The datasheet specifies CIN ≥ COUT, and when no output capacitor is used, CIN must be ≥0.1 µF. For optimal noise suppression and startup behavior, TI recommends 4.7 µF to 22 µF ceramic (X5R/X7R) capacitors placed close to the VIN and GND pins. CIN is mandatory; omission risks instability or excessive output noise.
Can LM4128DMFX-2.5/NOPB drive a 10 µF output capacitor, and how does it affect performance?
Yes, LM4128DMFX-2.5/NOPB is explicitly characterized for stability with capacitive loads up to 10 µF. Adding COUT improves load transient response when switching between light and heavy loads but increases turn-on time - e.g., from 33.2 µs (1 µF) to ~78.8 µs (10 µF). The device remains stable without oscillation, and no series resistance is required. COUT is optional but beneficial for dynamic applications like multiplexed ADC sampling.
What is the minimum input voltage required for LM4128DMFX-2.5/NOPB to maintain regulation at 10 mA load?
The minimum input voltage for LM4128DMFX-2.5/NOPB to maintain regulation at 10 mA load is VREF + dropout voltage. Per the Electrical Characteristics table for LM4128-2.5, dropout voltage is specified as 175 mV (typical) to 400 mV (max) at 10 mA. Therefore, minimum VIN = 2.5 V + 0.4 V = 2.9 V. Operation below this threshold causes output voltage to drop nonlinearly, violating the ±0.5% accuracy specification.
Is LM4128DMFX-2.5/NOPB qualified for automotive applications?
No, LM4128DMFX-2.5/NOPB is not AEC-Q100 qualified. The LM4128Q series (e.g., LM4128QAMF-2.5/NOPB) carries AEC-Q100 Grade 1 qualification (−40°C to +125°C) and is manufactured on an automotive-grade flow. LM4128DMFX-2.5/NOPB is an industrial-grade part; while it shares the same electrical specs and temperature range, it lacks automotive-specific reliability testing and traceability documentation required for automotive ECUs or safety-critical modules.
LM4128DMFX-2.5/NOPB 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
LM4128DMFX-2.5/NOPB FAQ
1.How can I place an order for LM4128DMFX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMFX-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 LM4128DMFX-2.5/NOPB reliable?
The price and inventory of LM4128DMFX-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 LM4128DMFX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DMFX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMFX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMFX-2.5/NOPB?
LM4128DMFX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMFX-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 LM4128DMFX-2.5/NOPB?
For technical support, including LM4128DMFX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMFX-2.5/NOPB requirements.
6.How does Aetrix verify that LM4128DMFX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DMFX-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 LM4128DMFX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DMFX-2.5/NOPB?
All LM4128DMFX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMFX-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 LM4128DMFX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128DMFX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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