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Texas Instruments LM4128CQ1MF2.5/NOPB
- Part No.:
- LM4128CQ1MF2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CQ1MF2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:192
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Product details
Overview
LM4128CQ1MF2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.5 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 battery-powered instrumentation and automotive sensor signal conditioning.
For engineers reviewing the LM4128CQ1MF2.5/NOPB datasheet, LM4128CQ1MF2.5/NOPB pinout, LM4128CQ1MF2.5/NOPB application, or LM4128CQ1MF2.5/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), line regulation (50 ppm/V), load regulation (25–120 ppm/mA), 0.1–10 Hz noise (275 µVPP), and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The LM4128CQ1MF2.5/NOPB is a band-gap-based series voltage reference with internal enable logic and no external capacitor requirement for stability. Its architecture ensures monotonic turn-on behavior and indefinite short-circuit protection (75 mA limit), while maintaining low thermal hysteresis (75 ppm) and long-term stability (50 ppm over 1000 hrs).
It operates with input voltage as low as VREF + 400 mV (i.e., ≥2.9 V) up to 5.5 V, accepts capacitive loads ≤10 µF, and remains stable with low-ESR ceramic capacitors. The enable pin has VIH ≥65% VIN and VIL ≤35% VIN thresholds, and the N/C pin (Pin 1) must remain unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.5% initial accuracy (C-grade) - ensures ADC/DAC reference error ≤12.5 mV at room temperature |
| Tempco | 100 ppm/°C max - contributes ≤0.25 V drift over −40°C to +125°C operating range |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA-systems with duty-cycled operation |
| Shutdown Current | 3–7 µA - reduces power loss during sleep modes without external switch |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from single-cell Li-ion (3.0 V min) or 3.3 V rails with margin |
| Noise (0.1–10 Hz) | 275 µVPP - supports 16-bit SAR ADCs without additional filtering |
| Load Drive | 20 mA max - sufficient to drive op-amp bias networks, DAC references, and small analog front-ends |
Pinout & Package
LM4128CQ1MF2.5/NOPB uses the 5-pin SOT-23 (DBV) package per JEDEC MO-178AB, with 0.95 mm pitch and 2.9 mm × 1.6 mm footprint. Pin 1 is N/C (no connect); pins are arranged top-view counterclockwise starting from the mark dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | N/C | No-connect terminal - must be left floating; not internally bonded |
| Pin 2 | GND | Analog ground reference - requires low-impedance connection to system AGND plane |
| Pin 3 | EN | Active-high enable input - pulls up internally (~2 µA); drives high to activate reference output |
| Pin 4 | VIN | Input supply - must exceed VREF + 400 mV; bypassed with ≥0.1 µF ceramic capacitor |
| Pin 5 | VREF | Precision 2.5 V output - capable of sourcing up to 20 mA; stable with COUT ≤10 µF |
Key Features
| Feature | Design Value |
|---|---|
| Grade-C precision | ±0.5% initial accuracy and 100 ppm/°C tempco - meets mid-tier industrial calibration requirements without trimming |
| Enable-controlled shutdown | Reduces quiescent current to 3–7 µA - enables dynamic power gating in portable data loggers |
| Capacitor-free stability | No mandatory output capacitor required - simplifies layout and reduces BOM count in space-constrained designs |
| AEC-Q100 Grade 1 | Qualified for −40°C to +125°C junction operation - suitable for under-hood automotive modules and ADAS sensors |
| Low-noise output | 275 µVPP (0.1–10 Hz) - avoids post-regulation filtering in precision 16-bit measurement systems |
Applications
| Instrumentation Signal Chain | Automotive Sensor Interface |
|---|---|
Use Scenario: High-resolution thermocouple amplifier with 24-bit ΣΔ ADC in portable calibrator. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC and PGA gain-setting resistors. Use Value: Enables <±0.01% full-scale error over temperature without recalibration, leveraging 100 ppm/°C tempco and 50 ppm long-term stability. | Use Scenario: Pressure sensor signal conditioning module in engine control unit (ECU). IC Role / Device Role / Timing Role: Supplies excitation and reference voltage for bridge-based pressure transducer and ratiometric ADC. Use Value: AEC-Q100 Grade 1 rating and −40°C to +125°C operation ensure reliability in under-hood environments; 20 mA drive supports multiple sensor channels. |
| Portable Medical Monitor | Battery-Powered Data Logger |
Use Scenario: ECG front-end with low-noise instrumentation amplifier and 16-bit SAR ADC. IC Role / Device Role / Timing Role: Delivers clean 2.5 V reference to ADC and analog comparator circuits. Use Value: 275 µVPP (0.1–10 Hz) noise floor preserves microvolt-level ECG signal integrity without added RC filtering. | Use Scenario: Environmental sensor node logging temperature/humidity every 5 minutes using coin-cell battery. IC Role / Device Role / Timing Role: Powers ADC reference and microcontroller VREF only during active sampling bursts. Use Value: 3–7 µA shutdown current extends 220 mAh CR2032 battery life beyond 5 years at 12 samples/day. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V, ±0.2% initial accuracy (A-grade), 50 ppm/°C, 50 µA IQ, SOT-23-5 - tighter accuracy/tempco but higher cost | Preferred where 16-bit+ ADC absolute accuracy dominates BOM cost; less suited for cost-sensitive automotive Grade 1 deployments | Select REF3025AIDBZR when initial accuracy <±0.2% is mandatory and AEC-Q100 is not required |
| MAX6029BASA25+ | 2.5 V, ±0.5% initial accuracy, 75 ppm/°C, 35 µA IQ, SO-8 - lower IQ but larger package and no enable pin | Suitable for board-space-flexible industrial PLCs; lacks shutdown control for ultra-low-power wake-up architectures | Select MAX6029BASA25+ when lowest quiescent current is critical and enable functionality is unnecessary |
Compared with REF3025AIDBZR and MAX6029BASA25+, LM4128CQ1MF2.5/NOPB uniquely balances AEC-Q100 Grade 1 qualification, enable-controlled shutdown, and SOT-23 footprint - making it optimal for automotive and portable industrial sensors where reliability, power gating, and size are jointly constrained.
Availability
LM4128CQ1MF2.5/NOPB is available at Aetrix Electronics and suitable for instrumentation signal chains, automotive sensor interfaces, and portable medical monitors requiring stable component supply across extended temperature ranges and automotive lifecycle demands.
Supply support for LM4128CQ1MF2.5/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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and automotive-grade components.
LM4128CQ1MF2.5/NOPB belongs to TI's precision voltage reference product line, designed specifically for high-accuracy, low-power, and AEC-Q100-compliant applications in automotive, industrial, and portable instrumentation systems.
FAQ
What is the maximum input voltage for LM4128CQ1MF2.5/NOPB?
The LM4128CQ1MF2.5/NOPB supports a maximum input voltage of 5.5 V. Operation above this level risks permanent damage, as specified in Absolute Maximum Ratings. For reliable performance, VIN must also stay ≥2.9 V (VREF + 400 mV) at 10 mA load to maintain regulation. The device includes built-in overvoltage protection on all pins up to 6 V, but sustained operation beyond 5.5 V is not guaranteed.
Does LM4128CQ1MF2.5/NOPB require an output capacitor?
No, LM4128CQ1MF2.5/NOPB does not require an output capacitor for stability - it is internally compensated and remains stable with capacitive loads up to 10 µF. An optional COUT improves load transient response, especially when switching between light and heavy loads, but adds turn-on delay. If used, low-ESR ceramic (X5R/X7R) is recommended and must be placed close to the VREF pin.
What does the 'CQ' in LM4128CQ1MF2.5/NOPB indicate?
The 'CQ' suffix in LM4128CQ1MF2.5/NOPB denotes two attributes: 'C' specifies the C-grade initial accuracy (±0.5%) and 100 ppm/°C temperature coefficient; 'Q' indicates AEC-Q100 Grade 1 qualification for automotive applications (−40°C to +125°C junction temperature). The '1MF' denotes SOT-23-5 (DBV) package with tape-and-reel packaging (1000 units/reel).
How does the enable pin function on LM4128CQ1MF2.5/NOPB?
The EN pin (Pin 3) on LM4128CQ1MF2.5/NOPB is an active-high digital control input with internal ~2 µA pull-up. When pulled ≥65% of VIN, the reference activates; when ≤35% of VIN, it enters shutdown with 3–7 µA supply current. Leaving EN floating defaults to enabled state due to internal pull-up. Driving EN directly from a microcontroller GPIO is safe and eliminates need for external pull-up resistors.
Is LM4128CQ1MF2.5/NOPB compatible with lead-free reflow processes?
Yes, LM4128CQ1MF2.5/NOPB is RoHS-compliant and rated for lead-free reflow with MSL Level-1 (260°C peak, unlimited floor life). Its SN (matte tin) lead finish and SOT-23 (DBV) package meet IPC/JEDEC J-STD-020D moisture sensitivity requirements. Standard reflow profiles for SnPb or Pb-free solder may be used, provided peak temperature does not exceed 260°C for more than 10 seconds.
LM4128CQ1MF2.5/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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 275µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.9V ~ 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
LM4128CQ1MF2.5/NOPB FAQ
1.How can I place an order for LM4128CQ1MF2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CQ1MF2.5/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 LM4128CQ1MF2.5/NOPB reliable?
The price and inventory of LM4128CQ1MF2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CQ1MF2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CQ1MF2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CQ1MF2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CQ1MF2.5/NOPB?
LM4128CQ1MF2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CQ1MF2.5/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 LM4128CQ1MF2.5/NOPB?
For technical support, including LM4128CQ1MF2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CQ1MF2.5/NOPB requirements.
6.How does Aetrix verify that LM4128CQ1MF2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CQ1MF2.5/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 LM4128CQ1MF2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CQ1MF2.5/NOPB?
All LM4128CQ1MF2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CQ1MF2.5/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 LM4128CQ1MF2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128CQ1MF2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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