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Texas Instruments LM4128CQ1MF3.3/NOPB
- Part No.:
- LM4128CQ1MF3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CQ1MF3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,137
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Product details
Overview
LM4128CQ1MF3.3/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 3.3 V output with ±0.5% initial accuracy, 100 ppm/°C temperature coefficient, and 60 µA supply current. It features an enable pin for 3 µA shutdown mode and supports up to 20 mA load current - ideal for battery-powered instrumentation and automotive sensor signal conditioning.
For engineers reviewing the LM4128CQ1MF3.3/NOPB datasheet, LM4128CQ1MF3.3/NOPB pinout, LM4128CQ1MF3.3/NOPB application, or LM4128CQ1MF3.3/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), 0.1–10 Hz noise (310 µVPP), thermal hysteresis (75 ppm), long-term stability (50 ppm/1000 hrs), and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The LM4128CQ1MF3.3/NOPB uses a band-gap–derived reference core with internal trimming for grade-C accuracy. Its enable input controls a low-leakage pass element, allowing transition between 60 µA active operation and 3–7 µA shutdown state without external circuitry.
Designed for capacitive-load stability, it operates reliably with COUT up to 10 µF and requires only a minimum 0.1 µF ceramic CIN. The 5-pin SOT-23 layout isolates the no-connect pin (Pin 1) to minimize parasitic coupling, while GND (Pin 2), EN (Pin 3), VIN (Pin 4), and VREF (Pin 5) define its minimal external interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.5% initial tolerance (Grade C) - ensures ADC/DAC reference accuracy within 16.5 mV at room temperature |
| Tempco | 100 ppm/°C max over −40°C to +125°C - limits drift to ±330 µV across full automotive temperature range |
| Supply Current | 60 µA typical active, 3–7 µA in shutdown - enables multi-year battery life in always-on monitoring systems |
| Dropout Voltage | 175–400 mV at 10 mA load - allows operation from 3.475 V input, compatible with single-cell LiFePO₄ or regulated 3.6 V rails |
| Noise (0.1–10 Hz) | 310 µVPP - supports 16-bit+ data acquisition where <1 LSB error requires <100 µVPP noise floor |
| Load Current | Up to 20 mA - sufficient to drive SAR ADC references, op-amp bias networks, and small DACs directly |
| Enable Threshold | VIL ≤35% VIN, VIH ≥65% VIN - compatible with standard CMOS logic levels across full input range |
Pinout & Package
LM4128CQ1MF3.3/NOPB is housed in a 5-pin SOT-23 (DBV) package - 2.9 mm × 1.6 mm × 1.15 mm body, 0.95 mm pitch, gull-wing leads. Pin 1 is no-connect and must remain floating; all other pins are electrically active.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect | Internally unconnected; must be left floating - avoids unintended coupling or ESD path |
| Pin 2 (GND) | Ground reference | Primary return path for reference core and output stage; requires low-impedance PCB connection to minimize noise |
| Pin 3 (EN) | Enable control input | Active-high digital input; pulls up internally (~2 µA); drives into shutdown when ≤35% VIN |
| Pin 4 (VIN) | Input supply | Power input requiring VIN ≥ VREF + 400 mV; accepts up to 5.5 V; bypassed by CIN ≥0.1 µF |
| Pin 5 (VREF) | Precision output | Stable 3.3 V reference source; capable of sourcing up to 20 mA; stable with COUT ≤10 µF |
Key Features
| Feature | Design Value |
|---|---|
| Grade-C AEC-Q100 qualification | Qualified to Grade 1 (−40°C to +125°C junction), manufactured on automotive flow - suitable for engine control, ADAS sensors, and infotainment power domains |
| Capacitor-free stability | No external compensation required; stable with 0–10 µF capacitive loads - reduces BOM count and board area in space-constrained modules |
| Low-noise architecture | 310 µVPP (0.1–10 Hz) and 85 ppm/V line regulation - maintains reference integrity in noisy automotive or industrial power environments |
| Indefinite short-circuit protection | Current-limited to 75 mA during output fault - prevents thermal runaway and enables safe operation in unattended systems |
| Minimal input capacitance | Requires only 0.1 µF CIN (no COUT needed) - simplifies layout and eliminates capacitor mismatch risks in high-reliability designs |
Applications
| Portable Data Loggers | Automotive Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Continuous 16-bit temperature/humidity logging in remote environmental monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Precision 3.3 V reference for SAR ADC and microcontroller VREF input, enabling accurate analog-to-digital conversion. Use Value: 60 µA quiescent current extends battery life beyond 5 years; ±0.5% initial accuracy and 100 ppm/°C tempco ensure measurement repeatability across seasonal temperature swings. |
Use Scenario: Front-end signal conditioning for MEMS pressure sensors in brake-fluid or tire-pressure monitoring systems. IC Role / Device Role / Timing Role: Stable excitation and reference source for ratiometric bridge measurements, rejecting supply ripple and thermal drift. Use Value: AEC-Q100 Grade 1 rating guarantees operation at 125°C under hood; 310 µVPP noise prevents quantization errors in 12–14 bit sensor outputs. |
| Industrial PLC Analog Input Modules | Medical Patient Monitoring Devices |
|
Use Scenario: Multi-channel 4–20 mA loop-powered analog input cards in factory automation controllers. IC Role / Device Role / Timing Role: Reference for precision current-sense amplifiers and isolated ΣΔ ADCs, providing traceable calibration baseline. Use Value: 50 ppm long-term stability over 1000 hrs minimizes recalibration frequency; 20 mA output current drives multiple channel references from single device. |
Use Scenario: Portable ECG and pulse oximetry units requiring FDA-compliant signal fidelity and multi-year shelf life. IC Role / Device Role / Timing Role: Primary voltage reference for low-noise instrumentation amplifiers and medical-grade ADCs. Use Value: Thermal hysteresis of 75 ppm ensures repeatable readings after patient-warm-up cycles; RoHS-compliant / NOPB marking meets IEC 60601-1 material 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 |
|---|---|---|---|
| MAX6126AUT33+ | 3.3 V, ±0.1% initial accuracy, 3 ppm/°C tempco, 12 µA IQ - higher precision but 2× cost and no enable pin | Suitable for metrology-grade lab equipment; not optimized for battery shutdown or automotive temp range | Select when ultra-low drift (<10 ppm total) outweighs cost and power savings |
| ADR3433ARJZ-R7 | 3.3 V, ±0.1% accuracy, 10 ppm/°C, 120 µA IQ, no enable - superior tempco but higher supply current and no shutdown mode | Better for fixed-power industrial systems needing lowest possible drift; lacks automotive qualification | Prefer for mains-powered test gear where 120 µA IQ is acceptable and AEC-Q100 is unnecessary |
Compared with MAX6126AUT33+ and ADR3433ARJZ-R7, LM4128CQ1MF3.3/NOPB uniquely balances AEC-Q100 Grade 1 compliance, 3 µA shutdown, and 100 ppm/°C tempco at mid-tier cost - making it optimal for automotive and portable industrial devices where power, qualification, and price intersect.
Availability
LM4128CQ1MF3.3/NOPB is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical instruments, and industrial data loggers requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LM4128CQ1MF3.3/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 reference design and automotive qualification.
LM4128CQ1MF3.3/NOPB belongs to TI's precision micropower voltage reference product line, engineered specifically for space-constrained, battery-operated, and automotive-grade applications demanding low drift, low power, and robust qualification.
FAQ
What is the maximum input voltage for LM4128CQ1MF3.3/NOPB?
The absolute maximum input voltage for LM4128CQ1MF3.3/NOPB is 6 V, but the recommended operating maximum is 5.5 V per the Electrical Characteristics table. Exceeding 5.5 V may cause parametric degradation or reliability risk, especially at elevated temperatures. For reliable operation, maintain VIN ≤5.5 V and ≥3.7 V (VREF + 400 mV) across the full load and temperature range.
Does LM4128CQ1MF3.3/NOPB require an external output capacitor?
No, LM4128CQ1MF3.3/NOPB is designed to operate stably without an external output capacitor. It remains stable with capacitive loads up to 10 µF, and adding COUT is optional - typically used to improve load transient response. The only mandatory capacitor is CIN (≥0.1 µF ceramic), placed between VIN and GND.
Is LM4128CQ1MF3.3/NOPB qualified for automotive applications?
Yes, LM4128CQ1MF3.3/NOPB is LM4128CQ grade and explicitly AEC-Q100 Grade 1 qualified (−40°C to +125°C junction temperature), manufactured on TI's automotive-grade flow. This makes it suitable for engine control units, ADAS sensors, body electronics, and other under-hood or cabin applications requiring automotive reliability certification.
What is the typical turn-on time for LM4128CQ1MF3.3/NOPB?
The typical turn-on time for LM4128CQ1MF3.3/NOPB is 33.2 µs when driving a 1 µF load and 78.8 µs with a 10 µF load, defined as time to reach 90% of 3.3 V output. Under brown-out conditions or at −40°C, turn-on time may extend up to 10 ms. Enable pin assertion must precede VIN ramp for predictable startup behavior.
How does the enable pin function on LM4128CQ1MF3.3/NOPB?
The enable pin (Pin 3) on LM4128CQ1MF3.3/NOPB is active-high with internal ~2 µA pull-up. It enters shutdown (3–7 µA IQ) when pulled ≤35% of VIN and activates fully when ≥65% of VIN. It can be driven directly from MCU GPIO or left open (pulled up internally), eliminating need for external resistors in most designs.
LM4128CQ1MF3.3/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:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°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
LM4128CQ1MF3.3/NOPB FAQ
1.How can I place an order for LM4128CQ1MF3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CQ1MF3.3/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 LM4128CQ1MF3.3/NOPB reliable?
The price and inventory of LM4128CQ1MF3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CQ1MF3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CQ1MF3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CQ1MF3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CQ1MF3.3/NOPB?
LM4128CQ1MF3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CQ1MF3.3/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 LM4128CQ1MF3.3/NOPB?
For technical support, including LM4128CQ1MF3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CQ1MF3.3/NOPB requirements.
6.How does Aetrix verify that LM4128CQ1MF3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CQ1MF3.3/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 LM4128CQ1MF3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CQ1MF3.3/NOPB?
All LM4128CQ1MF3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CQ1MF3.3/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 LM4128CQ1MF3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128CQ1MF3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128CQ1MF3.3/NOPB Tags
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