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Texas Instruments LM4128CQ1MF4.1/NOPB
- Part No.:
- LM4128CQ1MF4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CQ1MF4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,526
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Product details
Overview
LM4128CQ1MF4.1/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 4.096 V output with ±0.5% initial accuracy (C grade), 100 ppm/°C max temperature coefficient, 60 µA supply current, and 400 mV dropout at 10 mA load-designed for high-accuracy ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128CQ1MF4.1/NOPB datasheet, LM4128CQ1MF4.1/NOPB pinout, LM4128CQ1MF4.1/NOPB application, or LM4128CQ1MF4.1/NOPB equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in battery-powered data acquisition, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The LM4128CQ1MF4.1/NOPB implements a band-gap-derived series reference architecture with integrated enable control, eliminating external stabilization capacitors while maintaining stability with up to 10 µF capacitive loads. Its internal pull-up on EN (≈2 µA) supports direct VIN tie or active low-side switching.
It operates across −40°C to +125°C junction temperature, requires only CIN ≥ 0.1 µF (X5R/X7R ceramic), and features indefinite short-circuit protection (75 mA limit), 3 µA shutdown current, and 0.1 Hz–10 Hz output noise of 350 µVPP at 4.096 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal, ±0.5% initial tolerance (C grade) - enables direct interface with 12-bit ADCs without trimming |
| Tempco | 100 ppm/°C max over −40°C to +125°C - ensures ≤±0.5% output drift across full automotive temperature range |
| Supply Current | 60 µA typical - supports >1-year battery life in 10 µA-sleep IoT sensor nodes |
| Dropout Voltage | 400 mV max at 10 mA - allows operation from 4.5 V supply in 5 V systems with margin |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces quiescent power by 95% vs active mode during idle intervals |
| Load Regulation | 25–120 ppm/mA - maintains <±0.1% error from 0 to 20 mA load, critical for programmable current sources |
| Line Regulation | 100 ppm/V over VREF + 400 mV to 5.5 V - rejects ripple in noisy DC-DC outputs feeding precision analog stages |
Pinout & Package
LM4128CQ1MF4.1/NOPB uses the 5-pin SOT-23 (DBV) package per TI package code DBV (R-PDSO-G5), with 0.95 mm pitch, 2.9 mm × 1.6 mm footprint, and 1.1 mm height. Pin 1 is marked with a dot; pin 3 (EN) is active-high with internal 2 µA pull-up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect | Must be left floating; no internal connection - avoids unintended parasitic coupling or ESD path |
| 2 (GND) | Analog ground reference | Low-impedance return for reference output and enable logic; must connect to clean analog ground plane |
| 3 (EN) | Enable control input | Active-high logic: ≥65% of VIN enables reference; ≤35% disables it into 3 µA shutdown state |
| 4 (VIN) | Input supply | Accepts 4.496 V to 5.5 V (VREF + 400 mV min); powers internal band-gap and output buffer |
| 5 (VREF) | Precision output | 4.096 V source capable of sourcing up to 20 mA; stable with 0–10 µF capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Stable without external COUT | Eliminates output capacitor requirement - reduces BOM count and PCB area in space-constrained designs |
| Capacitive load drive | Guaranteed stability with up to 10 µF ceramic output capacitance - improves transient response in fast-switching DAC buffers |
| Low-noise output | 350 µVPP (0.1–10 Hz) at 4.096 V - supports 16-bit resolution without added filtering in precision measurement front-ends |
| Automotive qualification | AEC-Q100 Grade 1 (−40°C to +125°C) - qualified for under-hood and infotainment applications requiring long-term reliability |
| Indefinite short-circuit protection | Self-limiting to 75 mA output - prevents thermal runaway during accidental output-to-ground faults |
Applications
| Portable Data Loggers | Automotive Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and pressure at 1 Hz with 12-bit ADC. IC Role / Device Role / Timing Role: Provides stable 4.096 V reference for SAR ADC conversion, enabling full-scale resolution without calibration. Use Value: 60 µA supply current extends CR2032 battery life beyond 2 years; 100 ppm/°C tempco holds system accuracy within ±0.5 LSB over operating temperature. |
Use Scenario: Engine control unit measuring throttle position and coolant temperature using ratiometric sensors. IC Role / Device Role / Timing Role: Supplies excitation voltage and reference for analog front-end multiplexers and sigma-delta ADCs. Use Value: AEC-Q100 Grade 1 rating ensures functional integrity at 125°C junction; 400 mV dropout allows operation from degraded 4.5 V rail during cold cranking. |
| Medical Pulse Oximeter Analog Front-End | Industrial PLC Analog Input Modules |
Use Scenario: Wearable oximeter measuring photodiode currents with correlated double sampling. IC Role / Device Role / Timing Role: Generates precise 4.096 V bias for transimpedance amplifiers and reference for 16-bit delta-sigma ADC. Use Value: 350 µVPP low-frequency noise minimizes baseline drift in DC-coupled optical signal paths; EN pin enables synchronous power gating during LED off periods. |
Use Scenario: 4–20 mA loop-powered I/O module digitizing thermocouple and RTD signals in factory automation. IC Role / Device Role / Timing Role: Serves as master reference for isolated ADCs and programmable gain instrumentation amplifiers. Use Value: 20 mA output current drives multiple parallel ADC references; 0.5% initial accuracy eliminates per-unit calibration in high-volume production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3040AIDBZR | 4.096 V, ±0.2% initial accuracy (A grade), 50 ppm/°C max, 50 µA IQ, SOT-23-5 - tighter accuracy/tempco but no enable pin | Requires external enable circuitry for power gating; better for fixed-on systems needing highest stability | Select when long-term drift (<20 ppm/1000 hrs) and lower tempco outweigh need for integrated shutdown control |
| MAX6029AEUR+T | 4.096 V, ±0.2% initial accuracy, 75 ppm/°C max, 35 µA IQ, SOT-23-5 - includes enable but rated only to +85°C | Lacks automotive temperature range; unsuitable for under-hood or industrial high-temp deployments | Choose for cost-sensitive consumer electronics where extended temperature operation is not required |
Compared with LM4128CQ1MF4.1/NOPB, REF3040AIDBZR offers superior accuracy and stability but lacks integrated enable functionality, while MAX6029AEUR+T provides lower quiescent current and enable capability but sacrifices high-temperature operation-making LM4128CQ1MF4.1/NOPB the optimal balance for automotive-grade, enable-controlled, micropower reference needs.
Availability
LM4128CQ1MF4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, and industrial PLC analog input circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128CQ1MF4.1/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 IC design and automotive-grade qualification.
The LM4128 product line delivers micropower, high-accuracy series voltage references for battery-operated and automotive applications where low dropout, wide temperature operation, and integrated enable control are essential.
FAQ
What is the guaranteed initial accuracy of LM4128CQ1MF4.1/NOPB over temperature?
The LM4128CQ1MF4.1/NOPB is a C-grade device with ±0.5% initial output voltage accuracy at 25°C, and its temperature coefficient is specified at 100 ppm/°C maximum over −40°C to +125°C. This means total output deviation remains within ±0.5% + (100 ppm/°C × ΔT) across the full junction temperature range, ensuring predictable performance in automotive and industrial environments.
Does LM4128CQ1MF4.1/NOPB require an external output capacitor for stability?
No, LM4128CQ1MF4.1/NOPB is internally compensated and stable without any output capacitor. It remains stable with capacitive loads up to 10 µF, allowing designers to add COUT only when improved load transient response is needed-eliminating mandatory external components and reducing layout complexity.
What is the minimum input voltage required for LM4128CQ1MF4.1/NOPB to maintain regulation?
LM4128CQ1MF4.1/NOPB requires VIN ≥ VREF + 400 mV (i.e., ≥4.496 V) at 10 mA load to maintain output regulation within specification. At lighter loads, dropout decreases - e.g., 175 mV typical at 10 mA for 4.096 V version - enabling efficient operation in margin-constrained power domains.
How does the enable pin (EN) function on LM4128CQ1MF4.1/NOPB?
The EN pin on LM4128CQ1MF4.1/NOPB is active-high with an internal 2 µA pull-up. It enables the reference when driven ≥65% of VIN and disables it into 3–7 µA shutdown when pulled ≤35% of VIN. Leaving EN unconnected defaults to enabled state due to internal pull-up, simplifying designs without active control.
Is LM4128CQ1MF4.1/NOPB qualified for automotive applications?
Yes, LM4128CQ1MF4.1/NOPB is LM4128CQ - the "Q" suffix denotes AEC-Q100 Grade 1 qualification (−40°C to +125°C), manufactured on an automotive-grade flow. It meets stress test requirements for temperature cycling, humidity, and mechanical shock, making it suitable for engine control, ADAS, and body electronics.
LM4128CQ1MF4.1/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:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°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
LM4128CQ1MF4.1/NOPB FAQ
1.How can I place an order for LM4128CQ1MF4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CQ1MF4.1/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 LM4128CQ1MF4.1/NOPB reliable?
The price and inventory of LM4128CQ1MF4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CQ1MF4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CQ1MF4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CQ1MF4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CQ1MF4.1/NOPB?
LM4128CQ1MF4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CQ1MF4.1/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 LM4128CQ1MF4.1/NOPB?
For technical support, including LM4128CQ1MF4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CQ1MF4.1/NOPB requirements.
6.How does Aetrix verify that LM4128CQ1MF4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CQ1MF4.1/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 LM4128CQ1MF4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CQ1MF4.1/NOPB?
All LM4128CQ1MF4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CQ1MF4.1/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 LM4128CQ1MF4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4128CQ1MF4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128CQ1MF4.1/NOPB Tags
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