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Texas Instruments LM4128BMFX-3.3/NOPB
- Part No.:
- LM4128BMFX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMFX-3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,049
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Product details
Overview
LM4128BMFX-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 ±0.2% initial accuracy (Grade B), 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 LM4128BMFX-3.3/NOPB datasheet, LM4128BMFX-3.3/NOPB pinout, LM4128BMFX-3.3/NOPB application, or LM4128BMFX-3.3/NOPB equivalent, key selection criteria include dropout voltage (175–400 mV at 10 mA), line regulation (85 ppm/V), load regulation (25–120 ppm/mA), 0.1–10 Hz noise (310 µVPP), and stability with capacitive loads up to 10 µF without external compensation.
Technical Context
The LM4128BMFX-3.3/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 transition between active (60 µA) and shutdown (3–7 µA) states, with VIH/VIL thresholds defined at 65%/35% of VIN.
Designed as a series reference, it eliminates need for external stabilizing capacitor while maintaining stability with COUT ≤ 10 µF and low-ESR ceramic capacitors. Dropout is specified at 175 mV (typ) to 400 mV (max) at 10 mA load, enabling operation from VIN ≥ 3.475 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.2% initial accuracy (Grade B) - ensures ≤ ±6.6 mV absolute error at 25°C |
| Temperature Coefficient | 75 ppm/°C max - guarantees ≤ ±9.9 mV drift over −40°C to +125°C range |
| Supply Current | 60 µA typical - enables multi-year battery life in always-on sensor nodes |
| Shutdown Current | 3–7 µA - reduces system standby power by >90% vs active mode |
| Dropout Voltage | 175–400 mV at 10 mA - supports operation from single Li-ion cell (≥3.475 V input) |
| Output Noise | 310 µVPP (0.1–10 Hz) - suitable for 12-bit ADCs without additional filtering |
| Load Regulation | 25–120 ppm/mA - maintains < ±0.4 mV error across full 0–20 mA load range |
Pinout & Package
LM4128BMFX-3.3/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, JEDEC MO-178 compliant, and rated for −40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating; no internal connection or function |
| 2 (GND) | Analog ground reference | Primary return path for reference core and output stage; requires low-impedance PCB connection |
| 3 (EN) | Enable control input | Active-high logic input; drives device into 3–7 µA shutdown when pulled ≤35% of VIN |
| 4 (VIN) | Input supply rail | Accepts 3.475–5.5 V; must exceed VREF by ≥400 mV for full-load operation |
| 5 (VREF) | Precision output terminal | Delivers regulated 3.3 V; stable with 0–10 µF capacitive loads and low-ESR ceramics |
Key Features
| Feature | Design Value |
|---|---|
| Enable pin with 3 µA shutdown | Reduces system quiescent power by >95% during idle periods without external FET or sequencing circuitry |
| No external capacitor required | Stable with zero output capacitance - simplifies layout and eliminates risk of instability from ESR variation |
| Low 0.1–10 Hz noise (310 µVPP) | Supports high-resolution measurements in slow-sampling applications like weigh scales and environmental sensors |
| Indefinite short-circuit protection | Limits output current to 75 mA - prevents damage during board-level test or fault conditions |
| Stable with 10 µF capacitive loads | Enables fast load transient response in DAC buffers and precision regulators without phase-margin tuning |
Applications
| Portable Battery-Powered Equipment | Test & Measurement Instruments |
|---|---|
Use Scenario: Handheld multimeter powered by two AA cells with auto-ranging ADC front-end. IC Role / Device Role / Timing Role: Provides stable 3.3 V reference for 16-bit SAR ADC and microcontroller VREF. Use Value: Enables ±0.01% measurement accuracy across temperature and battery discharge, with <1 µA total shutdown current when off. | Use Scenario: Benchtop digital storage oscilloscope requiring precise vertical scaling calibration. IC Role / Device Role / Timing Role: Supplies reference voltage to programmable gain amplifier and offset correction DAC. Use Value: Delivers 75 ppm/°C drift performance and 310 µVPP noise - meets Class II metrology requirements per IEC 61000-4-30. |
| Data Acquisition Systems | Automotive Sensor Signal Conditioning |
Use Scenario: Industrial 8-channel analog input module with simultaneous sampling and isolation. IC Role / Device Role / Timing Role: Serves as common reference for eight isolated sigma-delta ADCs sharing one clock domain. Use Value: Maintains <±0.2% channel-to-channel matching via matched tempco and long-term stability (50 ppm/1000 hrs). | Use Scenario: Engine control unit (ECU) monitoring exhaust gas oxygen (EGO) sensor output under wide ambient temperature swings. IC Role / Device Role / Timing Role: References signal conditioning amplifier for wideband lambda sensor interface. Use Value: Guarantees <±10 mV absolute error from −40°C to +125°C, meeting AEC-Q100 Grade 1 requirements for under-hood use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3033AIDBZR | 3.3 V, ±0.2% initial accuracy, 50 ppm/°C max tempco, 50 µA supply current, SOT-23-3 package (no EN pin) | Fixed 3-pin configuration; lacks enable control and requires external bypass cap for stability | Select when board space is constrained and shutdown functionality is unnecessary |
| ADR3433ARJZ-R7 | 3.3 V, ±0.1% initial accuracy, 10 ppm/°C max tempco, 120 µA supply current, SOT-23-5 package with EN | Higher precision and lower drift, but doubles supply current and costs ~2.3× more | Select when sub-ppm/°C stability is critical and power budget allows >100 µA continuous draw |
Compared with REF3033AIDBZR and ADR3433ARJZ-R7, the LM4128BMFX-3.3/NOPB uniquely balances ultra-low shutdown current (3 µA), integrated enable, and SOT-23-5 compatibility - making it optimal for duty-cycled portable systems where both precision and power gating matter.
Availability
LM4128BMFX-3.3/NOPB is available at Aetrix Electronics and suitable for portable battery-powered equipment, test & measurement instruments, data acquisition systems, automotive sensor interfaces, and industrial process controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128BMFX-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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad industrial portfolio coverage.
The LM4128 product line delivers micropower, high-accuracy series voltage references optimized for space-constrained, battery-operated, and automotive-grade applications demanding low dropout, low noise, and robust thermal performance.
FAQ
What is the maximum input voltage for LM4128BMFX-3.3/NOPB?
The LM4128BMFX-3.3/NOPB supports a maximum input voltage of 5.5 V, as specified in its Absolute Maximum Ratings and Operating Ratings. Exceeding this voltage risks permanent damage. For reliable operation, VIN must also remain ≥ VREF + 400 mV (i.e., ≥3.475 V) across the full load and temperature range to maintain regulation. The device is not designed for reverse-voltage or overvoltage protection.
Does LM4128BMFX-3.3/NOPB require an input capacitor?
Yes, LM4128BMFX-3.3/NOPB requires an input capacitor (CIN). Per TI's Application Information, CIN must be ≥ COUT, and if no output capacitor is used, CIN must be at least 0.1 µF. A ceramic X5R/X7R capacitor is recommended. Omitting CIN may cause instability or degraded noise performance, especially under dynamic load or noisy supply conditions.
What is the output voltage tolerance of LM4128BMFX-3.3/NOPB over temperature?
The LM4128BMFX-3.3/NOPB (Grade B) has a guaranteed maximum temperature coefficient of 75 ppm/°C over −40°C to +125°C. This translates to a worst-case output deviation of ±9.9 mV (±0.3%) relative to 3.3 V across the full junction temperature range, in addition to its ±0.2% initial accuracy at 25°C - resulting in a total tolerance envelope of ±0.5% under worst-case conditions.
Can LM4128BMFX-3.3/NOPB drive a 10 µF capacitive load?
Yes, LM4128BMFX-3.3/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR ceramic types. This capability eliminates need for external series resistance or compensation networks. However, larger COUT values increase turn-on time (e.g., 78.8 µs to 90% for 10 µF vs 33.2 µs for 1 µF) and may affect transient response speed.
Is LM4128BMFX-3.3/NOPB qualified for automotive applications?
No, LM4128BMFX-3.3/NOPB is not AEC-Q100 qualified. Only the LM4128AQ/BQ/CQ/DQ variants (e.g., LM4128BQMF-3.3/NOPB) carry AEC-Q100 Grade 1 qualification and are manufactured on an automotive-grade flow. The "B" grade in LM4128BMFX-3.3/NOPB denotes initial accuracy (±0.2%), not automotive qualification. For under-hood or safety-critical automotive use, the Q-suffix variant must be selected.
LM4128BMFX-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:
- ±0.2%
- 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
LM4128BMFX-3.3/NOPB FAQ
1.How can I place an order for LM4128BMFX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMFX-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 LM4128BMFX-3.3/NOPB reliable?
The price and inventory of LM4128BMFX-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 LM4128BMFX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BMFX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMFX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMFX-3.3/NOPB?
LM4128BMFX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMFX-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 LM4128BMFX-3.3/NOPB?
For technical support, including LM4128BMFX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMFX-3.3/NOPB requirements.
6.How does Aetrix verify that LM4128BMFX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BMFX-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 LM4128BMFX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BMFX-3.3/NOPB?
All LM4128BMFX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMFX-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 LM4128BMFX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128BMFX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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