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Texas Instruments LM4128AQ1MFX3.3/NOPB
- Part No.:
- LM4128AQ1MFX3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AQ1MFX3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,228
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Product details
Overview
LM4128AQ1MFX3.3/NOPB from Texas Instruments is an AEC-Q100 Grade 1 qualified, precision micropower series voltage reference in a 5-pin SOT-23 package, delivering 3.3 V output with ±0.1% initial accuracy, 75 ppm/°C max temperature coefficient, and 60 µA supply current. It enables battery-powered instrumentation and automotive sensor signal conditioning where low dropout (400 mV), shutdown capability (3 µA), and stability with up to 10 µF capacitive loads are critical.
For engineers reviewing the LM4128AQ1MFX3.3/NOPB datasheet, LM4128AQ1MFX3.3/NOPB pinout, LM4128AQ1MFX3.3/NOPB application, or LM4128AQ1MFX3.3/NOPB equivalent, key selection criteria include automotive-grade reliability, 3.3 V reference stability across −40°C to +125°C, enable-controlled power gating, and compatibility with ceramic bypass capacitors without external compensation.
Technical Context
The LM4128AQ1MFX3.3/NOPB implements a band-gap-derived series reference architecture with internal enable logic and no external stabilization capacitor required. Its design ensures stable operation with input voltages as low as VREF + 400 mV and supports load currents up to 20 mA while maintaining 0.5% output accuracy.
It features indefinite short-circuit protection (75 mA limit), thermal hysteresis of 75 ppm, and long-term stability of 50 ppm over 1000 hours. The enable pin accepts logic-level inputs referenced to VIN, with VIH ≥65% VIN and VIL ≤35% VIN, enabling direct microcontroller GPIO control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.1% initial accuracy (Grade A) - ensures high-resolution ADC/DAC biasing without calibration. |
| Temperature Coefficient | 75 ppm/°C max - maintains <±0.99 mV drift over −40°C to +125°C for automotive under-hood applications. |
| Supply Current | 60 µA typical - enables multi-year operation on coin-cell batteries in portable sensors. |
| Shutdown Current | 3 µA max - reduces system standby power when reference is inactive. |
| Dropout Voltage | 400 mV max at 10 mA - allows operation from 3.7 V Li-ion cells down to end-of-discharge (~3.3 V). |
| Output Noise | 310 µVPP (0.1–10 Hz) - supports 16-bit+ data acquisition without added filtering. |
| Load Regulation | 120 ppm/mA max - holds output within ±0.396 mV across full 20 mA load range. |
| Line Regulation | 85 ppm/V - rejects input ripple up to 5.5 V supply without significant output variation. |
Pinout & Package
LM4128AQ1MFX3.3/NOPB uses the 5-pin SOT-23 (DBV) package per JEDEC MO-178AB, with 1.27 mm pitch and 2.9 mm × 1.6 mm footprint. Pin 1 is marked with a dot; Pin 3 (EN) controls active/shutdown mode; Pin 1 (N/C) must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must be left floating - no internal connection; solder mask or keep-out required. |
| Pin 2 (GND) | Analog ground reference | Low-impedance return path for reference core; requires dedicated ground plane tie. |
| Pin 3 (EN) | Enable control input | Active-high logic input; drives device into 3 µA shutdown when pulled low (<35% VIN). |
| Pin 4 (VIN) | Input supply rail | Accepts 3.7 V to 5.5 V; minimum headroom = VREF + 400 mV for regulation. |
| Pin 5 (VREF) | Precision output terminal | Provides stable 3.3 V reference; capable of sourcing up to 20 mA with <0.5% error. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive applications operating from −40°C to +125°C junction temperature. |
| No external capacitor required | Stable with zero output capacitance; eliminates BOM cost and layout area for basic use cases. |
| Capacitive load tolerance | Remains stable driving up to 10 µF ceramic output capacitance - improves transient response in noisy systems. |
| Indefinite short-circuit protection | Self-limits output current to 75 mA during fault - prevents damage during board test or miswiring. |
| Low ESR ceramic capacitor support | Compatible with X5R/X7R dielectrics - avoids instability risks associated with tantalum or aluminum electrolytics. |
| Thermal hysteresis control | 75 ppm max - minimizes voltage shift after thermal cycling, critical for factory calibration repeatability. |
Applications
| Automotive Sensor Signal Conditioning | Portable Data Logger |
|---|---|
Use Scenario: Reference for 16-bit SAR ADC measuring exhaust gas oxygen (EGO) sensor output in engine control units. IC Role / Device Role / Timing Role: Provides stable 3.3 V reference for analog front-end gain/offset calibration and ADC full-scale definition. Use Value: Enables <±0.5 LSB total unadjusted error over temperature, meeting ASAM MCD-2 MC compliance for OBD-II diagnostics. |
Use Scenario: Battery-powered environmental monitor logging temperature/humidity every 10 seconds using ultra-low-power MCU. IC Role / Device Role / Timing Role: Supplies precision reference to sigma-delta ADC and powers real-time clock oscillator circuitry. Use Value: Delivers 60 µA quiescent current and 3 µA shutdown mode, extending CR2032 battery life beyond 3 years. |
| Industrial PLC Analog Input Module | Medical Patient Monitor Front-End |
Use Scenario: 4–20 mA loop-powered transmitter with HART modulation requiring precise 3.3 V reference for DAC and isolator biasing. IC Role / Device Role / Timing Role: Serves as primary voltage reference for 12-bit DAC generating loop current setpoint and powering isolated RS-485 transceiver. Use Value: Maintains 75 ppm/°C tempco and 85 ppm/V line regulation to ensure <0.1% full-scale error across 0–60°C ambient and 18–30 V loop supply. |
Use Scenario: ECG amplifier stage requiring ultra-low-noise, stable reference for DC-coupled lead-off detection and baseline restoration. IC Role / Device Role / Timing Role: Supplies clean 3.3 V reference to instrumentation amplifier bias network and ADC reference input. Use Value: 310 µVPP (0.1–10 Hz) noise and 50 ppm long-term stability meet IEC 60601-2-27 ECG accuracy 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 |
|---|---|---|---|
| MAX6029AEUR+T | 3.3 V, ±0.1% initial accuracy, 50 ppm/°C, 35 µA IQ, SOT-23-5 - lower tempco and supply current but not AEC-Q100 qualified. | Suitable for industrial or medical systems without automotive qualification requirements. | Select when lowest possible drift and power are prioritized over automotive compliance. |
| ADR3433ARJZ-R7 | 3.3 V, ±0.1% initial accuracy, 10 ppm/°C, 120 µA IQ, SOT-23-5 - superior tempco but higher supply current and no enable pin. | Fits high-precision lab equipment where continuous operation is acceptable and ultra-low drift dominates. | Choose when sub-20 ppm/°C performance justifies 2× higher quiescent current and loss of shutdown control. |
Compared with MAX6029AEUR+T and ADR3433ARJZ-R7, LM4128AQ1MFX3.3/NOPB uniquely combines AEC-Q100 Grade 1 qualification, enable functionality, and 60 µA supply current - making it the only option among the three validated for automotive powertrain and chassis modules requiring both reliability and dynamic power management.
Availability
LM4128AQ1MFX3.3/NOPB is available at Aetrix Electronics and suitable for automotive electronics, industrial PLC analog input modules, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128AQ1MFX3.3/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 analog ICs and automotive-grade components.
The LM4128 family was designed specifically for space-constrained, battery-operated, and automotive applications demanding high initial accuracy, low temperature drift, and robust enable-controlled power management in miniature SOT-23 packaging.
FAQ
What is the maximum input voltage for LM4128AQ1MFX3.3/NOPB?
The absolute maximum input voltage for LM4128AQ1MFX3.3/NOPB is 6 V, but the recommended maximum operating input voltage is 5.5 V. Operation above 5.5 V risks exceeding absolute maximum ratings and may cause permanent damage. For reliable regulation, VIN must be ≥3.7 V (VREF + 400 mV) and ≤5.5 V under all conditions. This constraint ensures proper dropout margin and thermal safety within the SOT-23 package's 350 mW power dissipation limit.
Does LM4128AQ1MFX3.3/NOPB require an input capacitor?
Yes, LM4128AQ1MFX3.3/NOPB requires an input capacitor (CIN) for stable operation. The datasheet specifies CIN ≥ COUT, and if no output capacitor is used, CIN must be at least 0.1 µF. A 0.1 µF X7R ceramic capacitor placed close to Pins 4 (VIN) and 2 (GND) is the minimum recommended configuration. Larger values (e.g., 4.7 µF) further reduce startup overshoot and power-supply noise coupling, especially in noisy automotive or industrial environments.
What is the output voltage tolerance of LM4128AQ1MFX3.3/NOPB over temperature?
LM4128AQ1MFX3.3/NOPB has a maximum temperature coefficient of 75 ppm/°C (Grade A), resulting in a worst-case output deviation of ±0.99 mV over the full −40°C to +125°C junction temperature range. This corresponds to ±0.03% of 3.3 V. The specification is verified using the "Box" method per the datasheet and applies across the entire operating temperature range, not just at extremes - ensuring predictable behavior in automotive under-hood deployments.
Can LM4128AQ1MFX3.3/NOPB drive a 10 µF load capacitance?
Yes, LM4128AQ1MFX3.3/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR ceramic types (X5R/X7R). This capability eliminates the need for external isolation resistors or damping networks. However, increasing COUT extends turn-on time - e.g., from ~33 µs (1 µF) to ~79 µs (10 µF) - which must be accounted for in systems requiring fast reference activation after power-up or enable assertion.
Is LM4128AQ1MFX3.3/NOPB pin-compatible with other LM4128 variants?
Yes, all LM4128 variants - including LM4128AQ1MFX3.3/NOPB, LM4128AMF-2.5/NOPB, and LM4128Q series - share identical 5-pin SOT-23 (DBV) packaging and pinout (Pin 1: N/C, Pin 2: GND, Pin 3: EN, Pin 4: VIN, Pin 5: VREF). This allows drop-in replacement across output voltage options (1.8 V to 4.096 V) and grade levels (A–D) without PCB redesign, provided the enable logic and input voltage constraints are met for the target variant.
LM4128AQ1MFX3.3/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128AQ1MFX3.3/NOPB FAQ
1.How can I place an order for LM4128AQ1MFX3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AQ1MFX3.3/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 LM4128AQ1MFX3.3/NOPB reliable?
The price and inventory of LM4128AQ1MFX3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128AQ1MFX3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AQ1MFX3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AQ1MFX3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AQ1MFX3.3/NOPB?
LM4128AQ1MFX3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AQ1MFX3.3/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 LM4128AQ1MFX3.3/NOPB?
For technical support, including LM4128AQ1MFX3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AQ1MFX3.3/NOPB requirements.
6.How does Aetrix verify that LM4128AQ1MFX3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AQ1MFX3.3/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 LM4128AQ1MFX3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AQ1MFX3.3/NOPB?
All LM4128AQ1MFX3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AQ1MFX3.3/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 LM4128AQ1MFX3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128AQ1MFX3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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