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Texas Instruments LM4128AMF-3.3/NOPB
- Part No.:
- LM4128AMF-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMF-3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,056
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Product details
Overview
LM4128AMF-3.3/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 3.3 V output with ±0.1% initial accuracy (A-grade), 75 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 LM4128AMF-3.3/NOPB datasheet, LM4128AMF-3.3/NOPB pinout, LM4128AMF-3.3/NOPB application, or LM4128AMF-3.3/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), line regulation (85 ppm/V), load regulation (25–120 ppm/mA), and stability with capacitive loads up to 10 µF without external compensation.
Technical Context
The LM4128AMF-3.3/NOPB uses an internal band-gap-derived reference architecture with active error correction, enabling high initial accuracy and low thermal drift. Its enable input controls a low-leakage internal switch that reduces quiescent current to 3–7 µA in shutdown while maintaining fast turn-on time (typically 33.2 µs into 1 µF).
Designed as a series reference, it eliminates the need for an external stabilizing capacitor and remains stable with ceramic output capacitors up to 10 µF. Input voltage range is VREF + 400 mV to 5.5 V, supporting operation from single Li-ion cells or regulated 3.3 V/5 V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.1% initial accuracy (A-grade) - ensures ≤±3.3 mV absolute error at 25°C for 12-bit ADC biasing. |
| Tempco | 75 ppm/°C max - contributes ≤±24.8 ppm (0.0082 V) drift over −40°C to +125°C operating range. |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA average-power systems with periodic wake-up. |
| Shutdown Current | 3–7 µA - reduces system standby power by >90% vs active mode when EN = 0 V. |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from 3.475 V input, compatible with 3.3 V LDO outputs or partially discharged batteries. |
| Noise (0.1–10 Hz) | 310 µVPP - suitable for 16-bit SAR ADCs requiring <1 LSB noise at 3.3 V full-scale. |
| Load Current | Up to 20 mA - drives multiple op-amp references, DAC buffers, or MCU VREF inputs directly. |
Pinout & Package
LM4128AMF-3.3/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package with 1.27 mm pitch, rated for −40°C to +125°C junction temperature and MSL Level-1 reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain floating; no internal connection - avoids unintended parasitic paths or ESD coupling. |
| 2 - GND | Analog ground reference | Low-impedance return path for reference core and output stage; requires dedicated ground plane tie. |
| 3 - EN | Active-high enable control | Drives internal pass element; VIH ≥65% VIN, VIL ≤35% VIN - compatible with 1.8 V/3.3 V logic without level shift. |
| 4 - VIN | Input supply rail | Accepts 3.7 V to 5.5 V; must exceed VREF by ≥400 mV - enables direct use after 3.3 V LDO or single-cell Li-ion. |
| 5 - VREF | Precision output terminal | Delivers regulated 3.3 V; stable with 0–10 µF ceramic COUT; requires ≥0.1 µF CIN for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to 3–7 µA, enabling ultra-low-power sleep modes in portable sensors and IoT endpoints. |
| No external capacitor required | Stable with zero output capacitance - simplifies layout and eliminates capacitor aging or ESR-related drift in long-life designs. |
| Low dropout voltage | As low as 175 mV at 10 mA - extends usable battery voltage range and improves efficiency in energy-constrained systems. |
| Capacitive load tolerance | Stable with up to 10 µF ceramic output capacitance - improves transient response for pulsed loads like RF transceivers or flash memory. |
| High-grade accuracy option | A-grade (±0.1%) ensures guaranteed performance without calibration - reduces test time and BOM cost in production test fixtures. |
Applications
| Portable Data Loggers | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Continuous 16-bit ADC sampling in field-deployed environmental sensors powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Provides stable 3.3 V reference for SAR ADC and microcontroller VREF, rejecting supply ripple and temperature drift. Use Value: Enables ±0.1% measurement accuracy over −25°C to +70°C without recalibration, extending field service interval to 5+ years. |
Use Scenario: Handheld multimeter with autoranging, true RMS conversion, and Bluetooth telemetry. IC Role / Device Role / Timing Role: Supplies precision reference to dual-slope integrator and 24-bit ΣΔ ADC, synchronized with internal clock generator. Use Value: Maintains <0.01% gain error across battery discharge (3.6 V → 2.8 V), eliminating auto-zero drift during measurement cycles. |
| Industrial PLC Analog Input Modules | Automotive Body Control Units |
Use Scenario: 4–20 mA loop-powered I/O card with cold-junction compensation and thermocouple linearization. IC Role / Device Role / Timing Role: Reference source for programmable gain instrumentation amplifier and isolated ADC driver stage. Use Value: Delivers 75 ppm/°C tempco over −40°C to +85°C, meeting IEC 61000-6-2 immunity requirements without derating. |
Use Scenario: Cabin temperature sensor interface with LIN bus communication and EEPROM calibration storage. IC Role / Device Role / Timing Role: Precision bias for NTC thermistor measurement bridge and ADC reference in ASIL-B subsystem. Use Value: AEC-Q100 Grade 1 qualification (−40°C to +125°C) and 50 ppm long-term stability ensure 10-year calibration retention per ISO 26262. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3333AIDBVR | 3.3 V, ±0.1%, 30 ppm/°C, 3.9 µA IQ, SOT-23-5 - lower tempco and IQ but limited 10 mA output drive. | Suitable for ultra-low-power sensor nodes; not recommended for >10 mA loads or high-transient industrial interfaces. | Select REF3333AIDBVR only if load ≤10 mA and tempco <30 ppm/°C is mandatory; LM4128AMF-3.3/NOPB preferred for 20 mA drive capability. |
| ADR3433ARJZ-R7 | 3.3 V, ±0.1%, 10 ppm/°C, 120 µA IQ, SOT-23-5 - superior tempco but higher supply current and narrower input range (3.3 V to 5.5 V). | Fits high-accuracy medical instruments where tempco dominates error budget; less suitable for battery longevity-critical designs. | Choose ADR3433ARJZ-R7 when thermal stability is primary concern and supply current >100 µA is acceptable; LM4128AMF-3.3/NOPB offers better power-efficiency trade-off. |
Compared with REF3333AIDBVR and ADR3433ARJZ-R7, LM4128AMF-3.3/NOPB uniquely balances 20 mA drive strength, 60 µA IQ, and 75 ppm/°C tempco in a single AEC-Q100-qualified device - making it optimal for automotive body electronics and industrial analog front-ends requiring both robustness and efficiency.
Availability
LM4128AMF-3.3/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered test equipment, and industrial PLC analog input modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128AMF-3.3/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 reference design and high-reliability automotive qualification.
The LM4128 product line delivers micropower, high-accuracy series voltage references for space-constrained, battery-operated, and automotive-grade applications - engineered to meet stringent long-term stability and thermal hysteresis requirements.
FAQ
What is the maximum load current supported by the LM4128AMF-3.3/NOPB?
The LM4128AMF-3.3/NOPB supports up to 20 mA of continuous output current while maintaining specified accuracy and regulation. This enables direct driving of multiple downstream components such as op-amp bias networks, ADC reference inputs, and digital isolator supplies without external buffering. Exceeding 20 mA may cause output voltage deviation beyond the ±0.1% initial accuracy spec and increased dropout voltage - always verify load conditions against the Electrical Characteristics table in the LM4128AMF-3.3/NOPB datasheet.
Does the LM4128AMF-3.3/NOPB require an input capacitor?
Yes, the LM4128AMF-3.3/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) for stable operation, as specified in the TI SNVS475E datasheet. If an output capacitor (COUT) is used, CIN must be ≥ COUT. Larger CIN values (e.g., 4.7–22 µF) reduce startup overshoot and improve power-supply noise rejection. Omitting CIN risks oscillation or erratic behavior under dynamic load conditions - this requirement applies regardless of whether COUT is present.
What is the shutdown current of the LM4128AMF-3.3/NOPB?
The LM4128AMF-3.3/NOPB draws 3–7 µA in shutdown mode when the EN pin is driven low (≤35% of VIN). This ultra-low quiescent current enables multi-year battery operation in intermittent-sensing applications such as wireless sensor nodes or smart meters. The enable threshold is rail-ratio-based, ensuring compatibility with 1.8 V, 3.3 V, and 5 V logic families without external level-shifting circuitry.
Is the LM4128AMF-3.3/NOPB qualified for automotive applications?
Yes, the LM4128AMF-3.3/NOPB is AEC-Q100 Grade 1 qualified (−40°C to +125°C), manufactured on an automotive-grade flow, and listed in TI's automotive product portfolio. It meets stringent reliability, ESD, and thermal hysteresis requirements for body electronics, cabin control units, and non-safety-critical ADAS subsystems. Full qualification documentation and PPAP support are available through Texas Instruments' automotive channel partners.
How does the LM4128AMF-3.3/NOPB compare to shunt references in terms of power efficiency?
The LM4128AMF-3.3/NOPB is a series reference, consuming only 60 µA quiescent current regardless of load - unlike shunt references that must sink worst-case load current even at no load. This architecture reduces total system power by up to 95% in lightly loaded or duty-cycled applications. For example, a 20 mA shunt reference would draw ≥20 mA continuously, whereas LM4128AMF-3.3/NOPB draws just 60 µA active and 3–7 µA in shutdown - a critical advantage in battery-powered designs.
LM4128AMF-3.3/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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 310µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.7V ~ 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
LM4128AMF-3.3/NOPB FAQ
1.How can I place an order for LM4128AMF-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMF-3.3/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 LM4128AMF-3.3/NOPB reliable?
The price and inventory of LM4128AMF-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128AMF-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AMF-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMF-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMF-3.3/NOPB?
LM4128AMF-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMF-3.3/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 LM4128AMF-3.3/NOPB?
For technical support, including LM4128AMF-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMF-3.3/NOPB requirements.
6.How does Aetrix verify that LM4128AMF-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AMF-3.3/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 LM4128AMF-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AMF-3.3/NOPB?
All LM4128AMF-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMF-3.3/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 LM4128AMF-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128AMF-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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