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Texas Instruments LM4128AMFX-3.0/NOPB
- Part No.:
- LM4128AMFX-3.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMFX-3.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,195
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Product details
Overview
LM4128AMFX-3.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 3.0 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 high-accuracy ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128AMFX-3.0/NOPB datasheet, LM4128AMFX-3.0/NOPB pinout, LM4128AMFX-3.0/NOPB application, or LM4128AMFX-3.0/NOPB equivalent, key selection criteria include initial accuracy vs. tempco trade-offs, dropout voltage under 10 mA load (≤400 mV), stability with capacitive loads up to 10 µF, and compatibility with low-ESR ceramic bypass capacitors without external compensation.
Technical Context
The LM4128AMFX-3.0/NOPB uses a band-gap–derived reference core with internal trimming for high initial accuracy and low thermal drift. Its enable-controlled architecture allows seamless integration into power-gated systems, with guaranteed operation when VIN ≥ VREF + 400 mV (i.e., ≥3.4 V at 10 mA load).
It achieves stability without mandatory output capacitance and remains functional with input capacitors ≥0.1 µF (CIN ≥ COUT). The device exhibits 285 µVPP (0.1–10 Hz) output noise and maintains ≤120 ppm/mA load regulation across −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V nominal, ±0.1% initial accuracy (A-grade) - ensures ≤±3 mV absolute error at 25°C for 12-bit+ data converters. |
| Tempco | 75 ppm/°C max - limits worst-case drift to ±9.4 mV over −40°C to +125°C span. |
| Supply Current | 60 µA typical - enables multi-year battery life in always-on sensor nodes drawing <100 µA total. |
| Shutdown Current | 3 µA max when EN = 0 V - reduces quiescent power by >95% during system sleep cycles. |
| Dropout Voltage | 400 mV max at 10 mA - permits operation from 3.4 V supply, compatible with single-cell LiFePO₄ or regulated 3.3 V rails. |
| Load Regulation | 120 ppm/mA max - introduces ≤0.36 mV error across full 20 mA load range, critical for precision current sources. |
| Noise (0.1–10 Hz) | 285 µVPP - contributes <0.5 LSB error in 16-bit 3 V full-scale ADCs with proper filtering. |
Pinout & Package
LM4128AMFX-3.0/NOPB is housed in a 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 marked with a dot; Pin 3 (EN) is active-high with VIH ≥65% VIN and VIL ≤35% VIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect | Must be left floating; no internal connection - avoids unintended parasitic paths or ESD coupling. |
| 2 (GND) | Analog ground reference | Primary return path for reference current; requires low-impedance PCB connection to minimize ground bounce errors. |
| 3 (EN) | Enable control input | Active-high logic input; drives internal pass element - enables fast wake-up (<100 µs) from shutdown state. |
| 4 (VIN) | Input supply | Accepts 3.4 V to 5.5 V; must exceed VREF + 400 mV to maintain regulation at full load. |
| 5 (VREF) | Precision output | Low-impedance 3.0 V source; stable with 0–10 µF capacitive loads and capable of sourcing 20 mA continuously. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable with zero output capacitance - eliminates BOM cost and layout area for COUT while maintaining PSRR >60 dB at 100 Hz. |
| Capacitive load drive | Guaranteed stability with up to 10 µF ceramic output capacitance - improves transient response in dynamic load applications like multiplexed sensor front-ends. |
| Low dropout operation | 400 mV max dropout at 10 mA - enables direct use after LDOs with tight headroom or from partially discharged batteries. |
| High-grade accuracy option | A-grade (±0.1%) binning - meets requirements for factory-calibrated test equipment where post-fabrication trimming is impractical. |
| Extended temperature range | −40°C to +125°C operation - qualified for automotive engine-control modules and industrial motor drives without derating. |
Applications
| Instrumentation Signal Chain | Portable Data Acquisition |
|---|---|
|
Use Scenario: High-resolution multimeter measuring 0–3 V DC signals with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Primary voltage reference for ADC reference input and analog front-end gain calibration. Use Value: ±0.1% initial accuracy and 75 ppm/°C tempco ensure <±0.02% full-scale measurement error across lab temperature ranges. |
Use Scenario: Handheld environmental sensor node logging temperature/humidity with 12-bit ADC and BLE radio. IC Role / Device Role / Timing Role: Low-power reference for sensor signal conditioning and ADC conversion. Use Value: 60 µA operating current and 3 µA shutdown mode extend coin-cell battery life beyond 5 years in sleep-dominated duty cycles. |
| Automotive Sensor Interface | Medical Diagnostic Equipment |
|
Use Scenario: Engine coolant temperature sensor interface in AEC-Q100 Grade 1 compliant ECU. IC Role / Device Role / Timing Role: Precision bias source for RTD bridge amplifier and ADC reference in harsh-temperature environment. Use Value: −40°C to +125°C junction rating and 75 ppm/°C tempco maintain <±0.5% system accuracy across full automotive thermal profile. |
Use Scenario: Portable ECG monitor requiring stable 3.0 V reference for analog front-end and ADC in clinical-grade design. IC Role / Device Role / Timing Role: Low-noise, low-drift reference for biopotential signal digitization. Use Value: 285 µVPP (0.1–10 Hz) noise and 50 ppm long-term stability over 1000 hrs support FDA-critical baseline stability 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 |
|---|---|---|---|
| REF3030AIDBZR | 3.0 V, ±0.2% initial accuracy, 100 ppm/°C tempco, 50 µA IQ, SOT-23-3 - lacks enable pin and has higher tempco. | Lower-cost alternative where shutdown control is unnecessary and wider tempco is acceptable. | Select REF3030AIDBZR only if system does not require active power gating and can tolerate ±0.2% initial error. |
| ADR3430ARJZ-R7 | 3.0 V, ±0.1% initial accuracy, 50 ppm/°C tempco, 120 µA IQ, SOT-23-5 - superior tempco but double supply current. | Better drift performance for high-precision metrology, but incompatible with ultra-low-power battery designs. | Choose ADR3430ARJZ-R7 when long-term stability and thermal drift dominate over quiescent current budget. |
Compared with LM4128AMFX-3.0/NOPB, REF3030AIDBZR trades enable functionality and tighter accuracy for lower cost and current, while ADR3430ARJZ-R7 delivers lower tempco at the expense of 2× supply current - making LM4128AMFX-3.0/NOPB optimal for space-constrained, battery-powered systems needing both precision and controllable shutdown.
Availability
LM4128AMFX-3.0/NOPB is available at Aetrix Electronics and suitable for instrumentation signal chains, portable data acquisition systems, and automotive sensor interfaces requiring stable component supply with guaranteed long-term availability.
Supply support for LM4128AMFX-3.0/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 voltage references.
The LM4128 product line was designed for space-constrained, battery-powered applications demanding high initial accuracy, low temperature drift, and micropower operation - targeting instrumentation, medical, and automotive subsystems.
FAQ
What is the maximum input voltage for LM4128AMFX-3.0/NOPB?
The absolute maximum input voltage for LM4128AMFX-3.0/NOPB is 6 V, but the recommended maximum operating input voltage is 5.5 V. Exceeding 5.5 V may cause permanent damage or parametric shift. For reliable operation, VIN must remain within VREF + 400 mV (≥3.4 V) to 5.5 V across all load and temperature conditions. This range ensures regulation integrity and thermal safety in the SOT-23 package.
Does LM4128AMFX-3.0/NOPB require an input capacitor?
Yes, LM4128AMFX-3.0/NOPB requires an input capacitor (CIN) for stable operation. The minimum value is 0.1 µF when no output capacitor is used; otherwise, CIN must be ≥ COUT. Ceramic X5R/X7R types are recommended. Omitting CIN risks oscillation, startup failure, or degraded PSRR - especially under noisy supply conditions. TI's datasheet explicitly states "the capacitor CIN is required" in the Typical Application Circuit note.
What is the output voltage tolerance of LM4128AMFX-3.0/NOPB over temperature?
LM4128AMFX-3.0/NOPB (A-grade) has a maximum temperature coefficient of 75 ppm/°C over −40°C to +125°C. Applied to its 3.0 V output, this yields a worst-case drift of ±9.4 mV across the full range. Combined with ±0.1% initial accuracy (±3 mV), the total output tolerance remains within ±12.4 mV - verified via the "Box method" per TI's Electrical Characteristics table for LM4128-3.0.
Can LM4128AMFX-3.0/NOPB drive a 10 µF capacitive load?
Yes, LM4128AMFX-3.0/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, as stated in the Features section and confirmed in the Application Information. This capability enables improved load transient response in applications such as multiplexed sensor arrays or DAC buffer stages without requiring external isolation resistors or compensation networks.
Is LM4128AMFX-3.0/NOPB RoHS compliant and lead-free?
Yes, LM4128AMFX-3.0/NOPB is RoHS compliant and lead-free. Per TI's Packaging Information addendum, the part carries "Yes" under RoHS and uses "SN" (tin) lead finish. It is rated MSL Level-1 (unlimited floor life at ≤30°C/85% RH) and qualified for reflow up to 260°C peak, meeting IPC/JEDEC J-STD-020 standards for lead-free assembly.
LM4128AMFX-3.0/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):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 285µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.4V ~ 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
LM4128AMFX-3.0/NOPB FAQ
1.How can I place an order for LM4128AMFX-3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMFX-3.0/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 LM4128AMFX-3.0/NOPB reliable?
The price and inventory of LM4128AMFX-3.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128AMFX-3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AMFX-3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMFX-3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMFX-3.0/NOPB?
LM4128AMFX-3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMFX-3.0/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 LM4128AMFX-3.0/NOPB?
For technical support, including LM4128AMFX-3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMFX-3.0/NOPB requirements.
6.How does Aetrix verify that LM4128AMFX-3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AMFX-3.0/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 LM4128AMFX-3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AMFX-3.0/NOPB?
All LM4128AMFX-3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMFX-3.0/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 LM4128AMFX-3.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128AMFX-3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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