My Inquiry
My Account
Texas Instruments LM4128BMF-3.0/NOPB
- Part No.:
- LM4128BMF-3.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMF-3.0/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,155
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4128BMF-3.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 3.0 V output with ±0.2% initial accuracy (Grade B), 75 ppm/°C 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 LM4128BMF-3.0/NOPB datasheet, LM4128BMF-3.0/NOPB pinout, LM4128BMF-3.0/NOPB application, or LM4128BMF-3.0/NOPB equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The LM4128BMF-3.0/NOPB uses an internal band-gap-derived reference core with active error correction to achieve low drift and high initial accuracy. Its enable input controls a high-impedance shutdown path that reduces quiescent current to 3–7 µA while maintaining fast wake-up response.
Designed as a series reference, it eliminates need for external stabilization capacitors and remains stable with capacitive loads up to 10 µF. Input-to-output dropout is specified at 175–400 mV (at 10 mA), enabling operation from low-headroom supplies such as single-cell Li-ion or regulated 3.3 V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V nominal, ±0.2% initial tolerance (Grade B) - ensures ≤±6 mV absolute error at 25°C for 12-bit ADC biasing. |
| Tempco | 75 ppm/°C max (Grade B) - contributes ≤±9.45 mV drift over −40°C to +125°C, critical for industrial sensor calibration. |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA-sleep IoT nodes when paired with microcontroller-controlled EN pin. |
| Shutdown Current | 3–7 µA with EN = 0 V - allows deep power gating without external switches or leakage concerns. |
| Load Drive | 20 mA max output - sufficient to drive ADC reference inputs, op-amp bias networks, and small DACs directly. |
| Dropout Voltage | 175–400 mV at 10 mA - permits use with 3.3 V supply while maintaining regulation down to 3.1 V input. |
| Noise (0.1–10 Hz) | 285 µVPP - supports 16-bit SAR ADCs without additional filtering in precision measurement front-ends. |
Pinout & Package
LM4128BMF-3.0/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, JEDEC MO-178AA compliant, and RoHS-compliant matte tin lead finish. Thermal resistance θJ-A = 220°C/W enables operation at full 125°C junction temperature with minimal PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; no internal connection - avoids parasitic coupling or ESD path errors. |
| 2 - GND | Analog ground reference | Primary return path for reference core and output stage; requires low-impedance connection to clean analog ground plane. |
| 3 - EN | Enable control input | Active-high logic input; VIH ≥65% VIN, VIL ≤35% VIN - compatible with 1.8 V, 3.3 V, and 5 V GPIO without level shifters. |
| 4 - VIN | Input supply rail | Accepts 3.4 V to 5.5 V (VREF + 400 mV min); internal LDO-like regulation rejects supply ripple up to 60 dB @ 1 kHz. |
| 5 - VREF | Precision output terminal | Low-impedance buffered 3.0 V source; stable with 0–10 µF ceramic COUT; drives resistive and capacitive loads simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Grade B accuracy | ±0.2% initial output tolerance - meets calibration requirements for Class I portable multimeters and medical pulse oximeter references. |
| Capacitor-free stability | No mandatory output capacitor required - simplifies layout in space-constrained wearables and implantable sensor modules. |
| Low-noise architecture | 285 µVPP (0.1–10 Hz) - enables direct interface to 16-bit delta-sigma ADCs without post-filtering in weigh scale front-ends. |
| Indefinite short-circuit protection | 75 mA current limit - prevents damage during board test, connector mating, or accidental probe contact in production environments. |
| Wide temp range support | −40°C to +125°C operation - qualified for under-hood automotive sensors and industrial motor drive feedback circuits. |
Applications
| Instrumentation Calibration | Portable Data Acquisition |
|---|---|
Use Scenario: Benchtop digital multimeter performing auto-ranging DC voltage measurements with 0.1% accuracy class. IC Role / Device Role / Timing Role: Primary 3.0 V reference for 24-bit sigma-delta ADC and internal DAC-based offset trimming. Use Value: Grade B accuracy and 75 ppm/°C tempco ensure full-scale error stays within ±0.15% across 0–40°C lab environment. |
Use Scenario: Handheld environmental monitor logging temperature, humidity, and CO₂ using low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Stable 3.0 V reference for sensor signal conditioning and ADC conversion in sleep-wake cycles. Use Value: 60 µA operating current and 3 µA shutdown reduce average system current by 40% versus legacy shunt references. |
| Battery-Powered Medical Devices | Industrial PLC Analog Input Modules |
Use Scenario: Wearable ECG patch acquiring biopotential signals with 16-bit resolution and 24-hour runtime on coin cell. IC Role / Device Role / Timing Role: Low-noise 3.0 V reference for instrumentation amplifier gain-setting and ADC reference rail. Use Value: 285 µVPP noise floor preserves signal integrity below 1 µV p-p cardiac signals without added RC filtering. |
Use Scenario: DIN-rail mounted PLC module digitizing 4–20 mA field transmitter outputs with 12-bit isolation and cold-junction compensation. IC Role / Device Role / Timing Role: Precision 3.0 V reference for isolated ADC and thermocouple linearization circuitry. Use Value: −40°C to +125°C rating and thermal hysteresis <75 ppm ensure repeatability across factory-floor temperature swings. |
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, 50 ppm/°C tempco, 50 µA IQ, SOT-23-5 - lower noise (25 µVRMS) but no enable pin. | Best for always-on ultra-low-noise applications (e.g., laboratory-grade DAQ); unsuitable where dynamic power gating is required. | Select REF3030AIDBZR only if shutdown capability is unnecessary and noise budget is <20 µVRMS. |
| MAX6029AEUR+T | 3.0 V, ±0.2% initial accuracy, 75 ppm/°C tempco, 35 µA IQ, SOT-23-5 - includes enable pin but rated only to +85°C. | Suitable for commercial-grade portable electronics (e.g., barcode scanners), not for extended industrial or automotive use. | Choose MAX6029AEUR+T only for cost-sensitive consumer designs with ambient temp ≤85°C and no long-term stability requirement. |
Compared with REF3030AIDBZR and MAX6029AEUR+T, LM4128BMF-3.0/NOPB uniquely combines Grade B accuracy, enable functionality, −40°C to +125°C operation, and proven long-term stability (50 ppm/1000 hrs), making it the only option qualified for industrial and automotive-tier precision reference needs.
Availability
LM4128BMF-3.0/NOPB is available at Aetrix Electronics and suitable for instrumentation calibration, portable data acquisition, and battery-powered medical devices requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM4128BMF-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 industrial-grade reliability validation.
The LM4128 product line delivers micropower, high-accuracy series voltage references optimized for space-constrained, battery-operated, and wide-temperature industrial systems - emphasizing low dropout, capacitor-free stability, and robust ESD tolerance.
FAQ
What is the guaranteed initial accuracy of LM4128BMF-3.0/NOPB over temperature?
The LM4128BMF-3.0/NOPB is Grade B, ensuring ±0.2% initial output voltage accuracy at 25°C. Over the full −40°C to +125°C junction temperature range, total error includes tempco (75 ppm/°C), load regulation (≤120 ppm/mA), and line regulation (70 ppm/V), resulting in worst-case deviation of ±0.32% - verified per SNVS475E Electrical Characteristics table for LM4128-3.0.
Does LM4128BMF-3.0/NOPB require an input capacitor, and what value is recommended?
Yes - LM4128BMF-3.0/NOPB requires a minimum 0.1 µF ceramic input capacitor (X5R/X7R) for stable operation. When using an output capacitor (COUT), CIN must be ≥ COUT; for COUT = 1 µF, CIN ≥ 1 µF is recommended. Larger values (4.7–22 µF) further reduce startup overshoot and supply noise coupling, as confirmed in the Application Information section of SNVS475E.
Can LM4128BMF-3.0/NOPB drive a 10 µF capacitive load without oscillation?
Yes - LM4128BMF-3.0/NOPB is explicitly characterized for stability with capacitive loads up to 10 µF, per the datasheet's "Stable with Low ESR Ceramic Capacitors" feature and Figure 13 (Load Transient Response). No external compensation or series resistance is needed, unlike many older references requiring RC snubbers.
What is the maximum continuous output current supported by LM4128BMF-3.0/NOPB?
LM4128BMF-3.0/NOPB supports up to 20 mA of continuous output current, as specified in Absolute Maximum Ratings and confirmed in Load Regulation testing (ΔVREF/ΔILOAD ≤120 ppm/mA). Short-circuit current is limited to 75 mA, providing inherent protection during fault conditions without external current limiting.
How does the enable pin (EN) of LM4128BMF-3.0/NOPB interface with common microcontroller GPIOs?
The EN pin of LM4128BMF-3.0/NOPB is compatible with standard 1.8 V, 3.3 V, and 5 V GPIOs: VIH ≥65% VIN and VIL ≤35% VIN ensure reliable logic thresholds. With VIN = 3.3 V, EN activates above ~2.15 V and deactivates below ~1.15 V - eliminating need for external level shifters or pull-up resistors in most embedded designs.
LM4128BMF-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:
- ±0.2%
- 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
LM4128BMF-3.0/NOPB FAQ
1.How can I place an order for LM4128BMF-3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMF-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 LM4128BMF-3.0/NOPB reliable?
The price and inventory of LM4128BMF-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 LM4128BMF-3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BMF-3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMF-3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMF-3.0/NOPB?
LM4128BMF-3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMF-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 LM4128BMF-3.0/NOPB?
For technical support, including LM4128BMF-3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMF-3.0/NOPB requirements.
6.How does Aetrix verify that LM4128BMF-3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BMF-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 LM4128BMF-3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BMF-3.0/NOPB?
All LM4128BMF-3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMF-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 LM4128BMF-3.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128BMF-3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128BMF-3.0/NOPB Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
