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Texas Instruments LM4128CQ1MFX4.1/NOPB
- Part No.:
- LM4128CQ1MFX4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CQ1MFX4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,924
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Product details
Overview
LM4128CQ1MFX4.1/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, 100 ppm/°C temperature coefficient, and 60 µA supply current. It features an enable pin for 3–7 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 portable instrumentation.
For engineers reviewing the LM4128CQ1MFX4.1/NOPB datasheet, LM4128CQ1MFX4.1/NOPB pinout, LM4128CQ1MFX4.1/NOPB application, or LM4128CQ1MFX4.1/NOPB equivalent, key selection criteria include output stability under capacitive loads up to 10 µF, dropout voltage ≤400 mV at 10 mA, low 0.1–10 Hz noise (350 µVPP), and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The LM4128CQ1MFX4.1/NOPB implements a band-gap-derived series reference architecture with internal enable control logic and thermal compensation. Its design eliminates need for external stabilization capacitors while maintaining stability with output capacitance up to 10 µF and input capacitance ≥ COUT.
It operates across VIN = VREF + 400 mV to 5.5 V, delivers 4.096 V nominal output, and guarantees performance over −40°C to +125°C junction temperature. The C-grade variant specifies ±0.5% initial accuracy and 100 ppm/°C max tempco - tighter than D-grade but less stringent than A/B grades.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal; enables precise 12-bit DAC/ADC full-scale calibration without scaling resistors |
| Initial Accuracy | ±0.5% (C grade); ensures ≤20.5 mV absolute error at 25°C for 12-bit systems (1 LSB = 1.0 V / 4096 ≈ 0.244 mV) |
| Tempco | 100 ppm/°C max; contributes ≤0.512 mV drift over −40°C to +125°C (ΔT = 165°C) |
| Supply Current | 60 µA typical; allows >1-year battery life in 10 µA-sleep systems with periodic wake-up sampling |
| Shutdown Current | 3–7 µA with EN = 0 V; reduces quiescent power by >90% vs active mode in duty-cycled applications |
| Dropout Voltage | ≤400 mV at 10 mA; supports operation from 4.5 V supply in 5 V rail systems with margin |
| Noise (0.1–10 Hz) | 350 µVPP; limits RMS noise contribution to <12-bit ENOB degradation in precision signal chains |
Pinout & Package
LM4128CQ1MFX4.1/NOPB uses the 5-pin SOT-23 (DBV) package - 2.9 mm × 1.6 mm × 1.15 mm body, 0.95 mm pitch - qualified per AEC-Q100 Grade 1 for automotive under-hood use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; no PCB trace or pad required |
| 2 - GND | Analog ground reference | Low-impedance return path for reference output; requires dedicated ground plane tie |
| 3 - EN | Active-high enable input | Drives internal regulator; VIH ≥ 65% VIN, VIL ≤ 35% VIN; internal 2 µA pull-up allows direct VIN tie |
| 4 - VIN | Input supply | Accepts 4.496 V to 5.5 V; must exceed VREF + 400 mV for regulation; requires ≥0.1 µF ceramic CIN |
| 5 - VREF | Precision output | 4.096 V source; stable with 0–10 µF capacitive loads; COUT optional but improves transient response |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces supply current to 3–7 µA, enabling ultra-low-power duty cycling in portable data loggers |
| Capacitor-free stability | Operates stably without mandatory output capacitor - simplifies layout and reduces BOM count |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault, preventing thermal runaway and enabling robust system-level fault tolerance |
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation with lifetime reliability testing - suitable for automotive engine control modules |
| Low ESR ceramic compatibility | Stable with X5R/X7R MLCCs; eliminates need for tantalum or electrolytic capacitors in space-constrained designs |
Applications
| Portable Instrumentation | Automotive Sensor Conditioning |
|---|---|
|
Use Scenario: Handheld multimeter with 16-bit SAR ADC sampling thermocouple and RTD signals. IC Role / Device Role / Timing Role: Primary voltage reference for ADC reference input and analog front-end gain-setting DACs. Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco ensure <±0.1% total measurement error across operating temperature range without calibration. |
Use Scenario: Engine coolant temperature sensor module in Tier-1 powertrain ECU. IC Role / Device Role / Timing Role: Stable excitation reference for ratiometric RTD bridge and ADC reference in ASIL-B subsystem. Use Value: AEC-Q100 Grade 1 rating and −40°C to +125°C guaranteed operation eliminate derating concerns in under-hood environments. |
| Industrial Data Acquisition | Battery-Powered Medical Devices |
|
Use Scenario: 8-channel isolated analog input module for PLC with 24-bit ΣΔ ADCs. IC Role / Device Role / Timing Role: Per-channel precision reference for programmable-gain instrumentation amplifiers and ADC drivers. Use Value: 60 µA supply current and enable pin allow channel-wise power gating, reducing system idle current by >75%. |
Use Scenario: Portable ECG monitor with 24-hour continuous recording on coin-cell battery. IC Role / Device Role / Timing Role: Reference for low-noise analog front-end and 12-bit ADC sampling at 1 kSPS. Use Value: 350 µVPP (0.1–10 Hz) noise and 60 µA quiescent current extend battery life while preserving diagnostic SNR. |
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 tempco, 50 µA IQ, SOT-23-5 | Higher accuracy and lower tempco; no enable pin; not AEC-Q100 qualified | Select when highest stability is required and automotive qualification is unnecessary |
| MAX6035AAUT41+ | 4.096 V, ±0.2% initial accuracy, 75 ppm/°C tempco, 35 µA IQ, SOT-23-5, enable pin | Lower IQ and same enable function; industrial temp range only (−40°C to +125°C not guaranteed) | Select for ultra-low-power industrial systems where AEC-Q100 is not mandated |
Compared with LM4128CQ1MFX4.1/NOPB, REF3040AIDBZR offers superior accuracy and drift but lacks enable control and automotive qualification; MAX6035AAUT41+ matches enable functionality and lowers supply current but omits AEC-Q100 validation - making LM4128CQ1MFX4.1/NOPB the only option meeting all three: enable, C-grade accuracy, and Grade 1 qualification.
Availability
LM4128CQ1MFX4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor conditioning, and industrial data acquisition requiring stable component supply with automotive-grade reliability and long-term parametric consistency.
Supply support for LM4128CQ1MFX4.1/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 reference design and automotive-grade component validation.
LM4128CQ1MFX4.1/NOPB belongs to TI's precision micropower series voltage reference product line, engineered for high-accuracy, low-drift, and low-quiescent-current operation in space-constrained, battery-powered, and automotive applications.
FAQ
What is the output voltage tolerance and temperature coefficient of LM4128CQ1MFX4.1/NOPB?
The LM4128CQ1MFX4.1/NOPB provides a nominal 4.096 V output with ±0.5% initial accuracy (C grade) and a maximum temperature coefficient of 100 ppm/°C over −40°C to +125°C. These values are fully specified and production-tested per the SNVS475E datasheet, ensuring predictable performance in automotive and industrial environments where thermal stability is critical. The LM4128CQ1MFX4.1/NOPB meets these specs without requiring external trimming or calibration.
Does LM4128CQ1MFX4.1/NOPB require an external output capacitor for stability?
No, LM4128CQ1MFX4.1/NOPB is designed to be stable without an external output capacitor and remains stable with capacitive loads up to 10 µF. An input capacitor (CIN ≥ 0.1 µF ceramic) is mandatory, but COUT is optional - added only to improve load transient response. This eliminates risk of oscillation due to capacitor ESR or aging, simplifying design for high-reliability applications where LM4128CQ1MFX4.1/NOPB is deployed.
What is the minimum input voltage required for LM4128CQ1MFX4.1/NOPB to regulate properly?
LM4128CQ1MFX4.1/NOPB requires VIN ≥ VREF + 400 mV (i.e., ≥4.496 V) at 10 mA load to maintain regulation within specification. At lighter loads, dropout decreases - e.g., 175 mV typical at 10 mA for 4.096 V version. This low dropout enables operation from single Li-ion cells (fully charged ~4.2 V) only with careful margin analysis; dual-cell or regulated 5 V supplies are recommended for guaranteed performance across temperature and load.
Is LM4128CQ1MFX4.1/NOPB qualified for automotive applications?
Yes, LM4128CQ1MFX4.1/NOPB is LM4128CQ-series and explicitly AEC-Q100 Grade 1 qualified (−40°C to +125°C), manufactured on an automotive-grade flow. Its qualification includes stress testing for temperature cycling, humidity, and lifetime reliability - confirming suitability for engine control, transmission, and ADAS sensor modules where LM4128CQ1MFX4.1/NOPB serves as a trusted reference under harsh conditions.
How does the enable pin (EN) function on LM4128CQ1MFX4.1/NOPB?
The EN pin on LM4128CQ1MFX4.1/NOPB is an active-high digital control input with internal 2 µA pull-up. It enables normal operation when pulled ≥65% of VIN and disables the reference (reducing IQ to 3–7 µA) when ≤35% of VIN. Leaving EN unconnected defaults to enabled state via internal pull-up. This feature allows precise power sequencing in multi-rail systems and extends battery life in intermittently active devices using LM4128CQ1MFX4.1/NOPB.
LM4128CQ1MFX4.1/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
LM4128CQ1MFX4.1/NOPB FAQ
1.How can I place an order for LM4128CQ1MFX4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CQ1MFX4.1/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 LM4128CQ1MFX4.1/NOPB reliable?
The price and inventory of LM4128CQ1MFX4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CQ1MFX4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CQ1MFX4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CQ1MFX4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CQ1MFX4.1/NOPB?
LM4128CQ1MFX4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CQ1MFX4.1/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 LM4128CQ1MFX4.1/NOPB?
For technical support, including LM4128CQ1MFX4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CQ1MFX4.1/NOPB requirements.
6.How does Aetrix verify that LM4128CQ1MFX4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CQ1MFX4.1/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 LM4128CQ1MFX4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CQ1MFX4.1/NOPB?
All LM4128CQ1MFX4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CQ1MFX4.1/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 LM4128CQ1MFX4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4128CQ1MFX4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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