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Texas Instruments LM4128CMF-1.8/NOPB
- Part No.:
- LM4128CMF-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CMF-1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:392
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Product details
Overview
LM4128CMF-1.8/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 1.8 V output with ±0.5% initial accuracy (C grade), 100 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 battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128CMF-1.8/NOPB datasheet, LM4128CMF-1.8/NOPB pinout, LM4128CMF-1.8/NOPB application, or LM4128CMF-1.8/NOPB equivalent, key selection considerations include its 1.8 V fixed output, low dropout (400 mV at 10 mA), stability with capacitive loads up to 10 µF, and absence of required external output capacitor - critical for space-constrained, low-power analog signal chains.
Technical Context
The LM4128CMF-1.8/NOPB uses a band-gap–based series reference architecture optimized for micropower operation and high DC accuracy. Its internal design eliminates need for external output stabilization while maintaining stability with ceramic capacitors up to 10 µF and enabling direct drive of ADC reference inputs or precision regulator feedback networks.
It integrates an enable input (EN) referenced to VIN, with VIH ≥65% VIN and VIL ≤35% VIN, allowing clean digital control of reference activation. The no-connect (N/C) pin simplifies PCB layout and avoids unintended parasitic coupling in high-accuracy applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.5% initial accuracy (C grade) - ensures <9 mV absolute error at 25°C for 12-bit ADC reference scaling |
| Temperature Coefficient | 100 ppm/°C max - contributes ≤180 µV drift over −40°C to +125°C, supporting industrial-grade measurement stability |
| Supply Current | 60 µA typical - enables >1-year battery life in coin-cell–powered sensor nodes drawing <1 µA average system current |
| Shutdown Current | 3–7 µA with EN = 0 V - allows ultra-low-power sleep modes without external switch or LDO sequencing |
| Dropout Voltage | 400 mV max at 10 mA - permits operation from 2.2 V supply, compatible with single Li-ion or two alkaline cells |
| Load Regulation | 25–120 ppm/mA - maintains <216 µV output shift across full 20 mA load range, suitable for driving DAC buffers |
| Noise (0.1–10 Hz) | 170 µVPP - meets SNR requirements for 16-bit SAR ADCs with 1.8 V reference input |
Pinout & Package
LM4128CMF-1.8/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, JEDEC MO-178 compliant, and RoHS-compliant matte tin (SN) lead finish. Thermal resistance θJ-A = 220°C/W enables operation at full 125°C junction temperature with minimal PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; not internally bonded - prevents contamination-induced leakage paths |
| 2 - GND | Analog ground reference | Low-impedance return path for reference core and EN logic; requires dedicated ground plane connection |
| 3 - EN | Enable control input | Active-high digital input referenced to VIN; pulls up internally (~2 µA); drives into high-Z state when disabled |
| 4 - VIN | Input supply rail | Accepts 2.2 V to 5.5 V (VREF + 400 mV min); supplies internal band-gap and output buffer |
| 5 - VREF | Precision output terminal | Delivers regulated 1.8 V; stable with 0–10 µF capacitive loads; requires ≥0.1 µF CIN on VIN |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.8 V output | Optimized for modern low-voltage microcontrollers and 1.8 V ADC/DAC interfaces - eliminates need for external resistor dividers |
| Enable pin with 3 µA shutdown | Reduces system standby power by >95% vs. always-on references; supports wake-on-event architectures in IoT edge sensors |
| No required output capacitor | Enables direct connection to ADC REF pins without added BOM cost or board area; simplifies layout for high-density PCBs |
| Stable with 10 µF capacitive loads | Supports fast load transient response in precision regulators and active filter biasing - no external compensation needed |
| −40°C to +125°C operation | Validated for automotive under-hood and industrial motor-control environments without derating or thermal margin loss |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure with 16-bit ADC sampling every 10 seconds. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for ADC conversion and MCU analog peripherals. Use Value: 60 µA quiescent current extends CR2032 battery life beyond 2 years; 100 ppm/°C tempco ensures <±0.02% reading drift across outdoor operating range. |
Use Scenario: 4–20 mA loop-powered transmitter with HART communication, mounted in factory process piping. IC Role / Device Role / Timing Role: Supplies precision reference for current-loop DAC and sensor signal conditioning amplifier. Use Value: 125°C junction rating and 400 mV dropout allow operation from minimal loop headroom; EN pin enables HART modem power gating. |
| Medical Wearable Monitors | Automotive Cabin Sensors |
|
Use Scenario: ECG patch with ultra-low-power SoC, measuring biopotentials using differential amplifiers and 12-bit SAR ADC. IC Role / Device Role / Timing Role: Delivers low-noise 1.8 V reference for analog front-end and ADC reference input. Use Value: 170 µVPP (0.1–10 Hz) noise ensures ≥70 dB SNR; C grade accuracy guarantees consistent calibration across production units. |
Use Scenario: Occupant detection system using capacitive sensing ICs inside vehicle seats, operating across cabin temperature extremes. IC Role / Device Role / Timing Role: Supplies stable reference for capacitance-to-digital converter (CDC) and microcontroller ADC. Use Value: AEC-Q100 Grade 1 qualification (LM4128CQ variant) and −40°C to +125°C performance ensure reliability in uncontrolled thermal environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3018AIDBZR | 1.8 V, ±0.2% initial accuracy (A grade), 50 ppm/°C max, 50 µA IQ, SOT-23-3 - no enable pin, lower noise (120 µVPP) | Lacks shutdown capability; requires external enable circuitry for power gating | Choose for lowest noise and tighter accuracy where enable functionality is unnecessary |
| MAX6029AEUR+T | 1.8 V, ±0.2% initial accuracy, 75 ppm/°C max, 35 µA IQ, SOT-23-5 - includes enable, but only rated to +85°C | Not qualified for extended temperature industrial or automotive use | Choose for cost-sensitive consumer applications with ambient temperature <85°C |
Compared with REF3018AIDBZR and MAX6029AEUR+T, LM4128CMF-1.8/NOPB uniquely balances C-grade accuracy, full industrial temperature range, integrated enable, and proven stability with large capacitive loads - making it optimal for battery-powered, space-constrained systems requiring guaranteed performance across harsh thermal profiles.
Availability
LM4128CMF-1.8/NOPB is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor transmitters, and automotive cabin sensors requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for LM4128CMF-1.8/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 focused on analog and embedded processing technologies, with decades of expertise in precision analog ICs and voltage references.
The LM4128 product line delivers micropower, high-accuracy series voltage references for battery-operated and thermally demanding applications - designed specifically for instrumentation, data acquisition, and industrial control systems where size, power, and stability are critical.
FAQ
What is the maximum load current supported by LM4128CMF-1.8/NOPB?
The LM4128CMF-1.8/NOPB supports up to 20 mA output current while maintaining specified accuracy and regulation. At 10 mA load, dropout voltage remains ≤400 mV, and load regulation is bounded at 25–120 ppm/mA. Exceeding 20 mA triggers short-circuit protection limiting output to ~75 mA indefinitely.
Does LM4128CMF-1.8/NOPB require an external output capacitor?
No - LM4128CMF-1.8/NOPB is stable without an external output capacitor and is certified stable with capacitive loads up to 10 µF. An output capacitor (COUT) is optional and improves load transient response; however, CIN ≥0.1 µF on VIN is mandatory for stability per TI's application guidance.
What is the function of Pin 1 (N/C) on LM4128CMF-1.8/NOPB?
Pin 1 is a no-connect (N/C) terminal - it is not bonded internally and must remain unconnected and floating in the PCB layout. Leaving it unconnected prevents parasitic leakage paths that could degrade long-term stability or increase output noise in high-precision applications.
How does the enable pin (EN) operate on LM4128CMF-1.8/NOPB?
The EN pin on LM4128CMF-1.8/NOPB is an active-high input referenced to VIN. It activates the reference when voltage exceeds 65% of VIN (VIH) and disables it below 35% of VIN (VIL). Internal ~2 µA pull-up allows direct connection to VIN for always-on operation, or to a GPIO for controlled shutdown down to 3–7 µA.
Is LM4128CMF-1.8/NOPB suitable for automotive applications?
The LM4128CMF-1.8/NOPB itself is not AEC-Q100 qualified; however, the pin-compatible LM4128CQMF-1.8/NOPB variant is AEC-Q100 Grade 1 qualified (−40°C to +125°C) and manufactured on TI's automotive flow. For automotive cabin or body electronics, specify the Q-grade version to meet qualification requirements.
LM4128CMF-1.8/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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 170µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.2V ~ 5.5V
- Current - Supply:
- 100µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128CMF-1.8/NOPB FAQ
1.How can I place an order for LM4128CMF-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CMF-1.8/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 LM4128CMF-1.8/NOPB reliable?
The price and inventory of LM4128CMF-1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CMF-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CMF-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CMF-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CMF-1.8/NOPB?
LM4128CMF-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CMF-1.8/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 LM4128CMF-1.8/NOPB?
For technical support, including LM4128CMF-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CMF-1.8/NOPB requirements.
6.How does Aetrix verify that LM4128CMF-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CMF-1.8/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 LM4128CMF-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CMF-1.8/NOPB?
All LM4128CMF-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CMF-1.8/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 LM4128CMF-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4128CMF-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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