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Texas Instruments LM4128BQ1MFX4.1/NOPB
- Part No.:
- LM4128BQ1MFX4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BQ1MFX4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,268
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Product details
Overview
LM4128BQ1MFX4.1/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 4.096 V output with ±0.2% initial accuracy, 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 automotive sensor modules.
For engineers reviewing the LM4128BQ1MFX4.1/NOPB datasheet, LM4128BQ1MFX4.1/NOPB pinout, LM4128BQ1MFX4.1/NOPB application, or LM4128BQ1MFX4.1/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), stability with 10 µF capacitive loads, and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The LM4128BQ1MFX4.1/NOPB uses a band-gap–derived reference core with internal enable logic and low-dropout series architecture. Its design eliminates need for external stabilization capacitors while maintaining stability with output capacitance up to 10 µF and ESR down to zero.
It operates across VIN = VREF + 400 mV to 5.5 V, delivers 4.096 V nominal output, and achieves 75 ppm/°C tempco (Grade B) via trimmed curvature compensation - enabling stable performance across automotive thermal cycles without external calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V ±0.2% (Grade B) - matches 12-bit DAC full-scale reference and enables 1 LSB accuracy without trimming |
| Initial Accuracy | ±0.2% over −40°C to +125°C - ensures single-point calibration suffices for production test |
| Tempco | 75 ppm/°C max - limits drift to ≤±0.42 mV over full automotive temperature range |
| Supply Current | 60 µA typical - extends battery life in always-on vehicle telematics sensors |
| Shutdown Current | 3–7 µA with EN = 0 V - enables ultra-low-power wake-on-event architectures |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from 4.5 V rail with 400 mV headroom margin |
| Load Capability | 20 mA max - drives multiple SAR ADC references or op-amp bias networks directly |
Pinout & Package
LM4128BQ1MFX4.1/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. Thermal resistance θJ-A = 220°C/W enables operation at full rated load in compact automotive PCB layouts without heatsinking.
| 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 current; requires low-impedance PCB plane tie |
| 3 - EN | Enable control input | Active-high logic: ≥65% of VIN enables device; ≤35% disables into 3 µA shutdown |
| 4 - VIN | Input supply | Accepts 4.496 V to 5.5 V; must exceed VREF by ≥400 mV for regulation |
| 5 - VREF | Precision output | 4.096 V source with 25–120 ppm/mA load regulation; stable with 0–10 µF capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualified | Validated for −40°C to +125°C junction operation in automotive ECUs and ADAS sensors |
| Stable with 10 µF capacitive loads | Eliminates need for external compensation network - simplifies layout and reduces BOM count |
| Low-noise 0.1–10 Hz output | 350 µVPP - meets noise floor requirements for 16-bit precision data acquisition systems |
| Indefinite short-circuit protection | Limits output current to 75 mA - prevents damage during board-level fault conditions |
| Thermal hysteresis ≤75 ppm | Ensures repeatable output after thermal cycling - critical for factory calibration repeatability |
Applications
| Automotive Sensor Signal Conditioning | Portable Medical Instrumentation |
|---|---|
Use Scenario: Biasing thermistor bridges and RTD front-ends in engine coolant temperature and exhaust gas sensors. IC Role / Device Role / Timing Role: Precision 4.096 V reference for 12-bit delta-sigma ADCs in ASIL-B compliant modules. Use Value: ±0.2% initial accuracy and 75 ppm/°C tempco ensure <1 LSB error across −40°C to +125°C without software correction. |
Use Scenario: Supplying reference voltage to portable ECG analog front-ends and pulse oximeter ADCs. IC Role / Device Role / Timing Role: Low-quiescent-current voltage reference enabling >72-hour battery life in Class II medical devices. Use Value: 60 µA operating current and 3 µA shutdown mode extend CR2032 coin-cell lifetime while maintaining 12-bit measurement fidelity. |
| Industrial Data Acquisition Modules | Battery-Powered Test Equipment |
Use Scenario: Calibrating multi-channel 16-bit SAR ADCs in PLC I/O modules and field transmitters. IC Role / Device Role / Timing Role: Primary reference source for ratiometric sensor measurements and self-calibration routines. Use Value: 350 µVPP (0.1–10 Hz) noise and 50 ppm long-term stability support NIST-traceable calibration intervals exceeding 12 months. |
Use Scenario: Powering handheld multimeters and portable oscilloscope reference rails during field service. IC Role / Device Role / Timing Role: Stable 4.096 V reference enabling accurate DC voltage measurement with ±0.05% basic accuracy. Use Value: Dropout voltage ≤400 mV allows operation from partially discharged Li-ion cells (3.4 V min), extending usable runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3340AIDBVR | 4.096 V, ±0.1% initial accuracy, 30 ppm/°C, 3.9 µA IQ, SOT-23-5 | Lower power but lower tempco grade; not AEC-Q100 qualified | Prefer for ultra-low-power portable instrumentation where automotive qualification is unnecessary |
| MAX6126AASA41+ | 4.096 V, ±0.06% initial accuracy, 3 ppm/°C, 120 µA IQ, SO-8 | Higher accuracy and stability, but larger SO-8 package and higher quiescent current | Choose when sub-ppm stability and metrology-grade performance outweigh size and power constraints |
Compared with REF3340AIDBVR and MAX6126AASA41+, the LM4128BQ1MFX4.1/NOPB uniquely balances AEC-Q100 Grade 1 compliance, 5-pin SOT-23 footprint, and 60 µA supply current - making it the only option qualified for space-constrained automotive sensing nodes requiring both robustness and micropower operation.
Availability
LM4128BQ1MFX4.1/NOPB is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical devices, industrial data loggers, and battery-powered test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128BQ1MFX4.1/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-qualified components.
The LM4128 family was designed specifically for high-accuracy, low-power voltage referencing in automotive, industrial, and portable instrumentation - emphasizing AEC-Q100 compliance, micropower operation, and SOT-23 space efficiency.
FAQ
What is the guaranteed initial accuracy of LM4128BQ1MFX4.1/NOPB over temperature?
The LM4128BQ1MFX4.1/NOPB is a Grade B device with guaranteed ±0.2% initial accuracy over the full −40°C to +125°C junction temperature range. This specification is production-tested and applies to all units shipped under this part number, ensuring consistent performance in automotive under-hood environments without post-installation trimming.
Does LM4128BQ1MFX4.1/NOPB require an input capacitor, and what value is recommended?
Yes, LM4128BQ1MFX4.1/NOPB requires an input capacitor (CIN). The datasheet mandates CIN ≥ COUT, with a minimum of 0.1 µF when no output capacitor is used. For optimal noise suppression and startup behavior, TI recommends 4.7 µF to 22 µF ceramic (X5R/X7R) placed close to the VIN and GND pins - a requirement confirmed in the APPLICATION INFORMATION section.
Is LM4128BQ1MFX4.1/NOPB pin-compatible with other LM4128 variants?
Yes, LM4128BQ1MFX4.1/NOPB shares identical 5-pin SOT-23 (DBV) pinout and package dimensions with all LM4128x and LM4128Qx variants, including LM4128AMF-4.1/NOPB and LM4128CMF-4.1/NOPB. Pin functions (N/C, GND, EN, VIN, VREF) and mechanical footprint are fully interchangeable - enabling drop-in replacement across accuracy grades.
What is the maximum capacitive load LM4128BQ1MFX4.1/NOPB can drive while remaining stable?
LM4128BQ1MFX4.1/NOPB is specified to remain stable with capacitive loads up to 10 µF, regardless of ESR - including zero-ESR ceramic types. This capability is explicitly verified in the datasheet's "Stable with Low ESR Ceramic Capacitors" feature and "Typical Application Circuit" notes, eliminating need for series resistance or external compensation.
How does the enable functionality of LM4128BQ1MFX4.1/NOPB behave during power-up?
LM4128BQ1MFX4.1/NOPB features an internal ~2 µA pull-up on the EN pin. When left floating or tied to VIN, the device powers up enabled. To guarantee controlled startup, drive EN ≥65% of VIN to enable or ≤35% of VIN to enter 3–7 µA shutdown. The enable threshold is rail-ratio based, not fixed voltage - ensuring robust operation across varying input rails.
LM4128BQ1MFX4.1/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):
- 4.096V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 350µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.496V ~ 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
LM4128BQ1MFX4.1/NOPB FAQ
1.How can I place an order for LM4128BQ1MFX4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BQ1MFX4.1/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 LM4128BQ1MFX4.1/NOPB reliable?
The price and inventory of LM4128BQ1MFX4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BQ1MFX4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BQ1MFX4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BQ1MFX4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BQ1MFX4.1/NOPB?
LM4128BQ1MFX4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BQ1MFX4.1/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 LM4128BQ1MFX4.1/NOPB?
For technical support, including LM4128BQ1MFX4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BQ1MFX4.1/NOPB requirements.
6.How does Aetrix verify that LM4128BQ1MFX4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BQ1MFX4.1/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 LM4128BQ1MFX4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BQ1MFX4.1/NOPB?
All LM4128BQ1MFX4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BQ1MFX4.1/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 LM4128BQ1MFX4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4128BQ1MFX4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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