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Texas Instruments LM4128AMFX-1.8/NOPB
- Part No.:
- LM4128AMFX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMFX-1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,011
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Product details
Overview
LM4128AMFX-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 ±0.1% initial accuracy (A-grade), 75 ppm/°C temperature coefficient, and 60 µA supply current. It supports 20 mA output current, features an enable pin for 3 µA shutdown mode, and operates from −40°C to +125°C - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128AMFX-1.8/NOPB datasheet, LM4128AMFX-1.8/NOPB pinout, LM4128AMFX-1.8/NOPB application, or LM4128AMFX-1.8/NOPB equivalent, key selection criteria include initial accuracy at 1.8 V, low dropout (200–400 mV), stability with up to 10 µF capacitive loads, and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The LM4128AMFX-1.8/NOPB employs a band-gap-derived reference core optimized for micropower operation and low thermal drift. Its internal architecture eliminates need for external stabilization capacitors while maintaining stability with capacitive loads up to 10 µF - enabled by low-output-impedance design and integrated enable control logic.
It operates as a series reference with VIN ≥ VREF + 400 mV (min 2.2 V at 10 mA load), delivers regulated 1.8 V output across full −40°C to +125°C junction range, and includes indefinite short-circuit protection limiting output current to 75 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.1% initial accuracy (A-grade) - ensures ≤1.8 mV absolute error at 25°C for high-resolution ADC/DAC biasing. |
| Temperature Coefficient | 75 ppm/°C max - limits drift to ≤16.2 µV/°C over operating range, critical for precision sensor signal chains. |
| Supply Current | 60 µA typical - enables multi-year battery life in always-on portable equipment with minimal quiescent power burden. |
| Shutdown Current | 3–7 µA with EN = 0 V - allows deep-sleep modes without external disconnect circuitry. |
| Dropout Voltage | 200–400 mV at 10 mA - supports operation from single-cell Li-ion (3.0–4.2 V) or 2.5 V system rails with margin. |
| Load Regulation | 25–120 ppm/mA - maintains <±0.22 mV output shift across 0–20 mA load, suitable for driving op-amp references or ADC inputs. |
| Noise (0.1–10 Hz) | 170 µVPP - low enough for 16-bit+ data converters without additional filtering. |
Pinout & Package
LM4128AMFX-1.8/NOPB uses a 5-pin SOT-23 (DBV) package with exposed pad not connected internally. Pin 1 is N/C (no connect); pins must be routed per TI's DBV mechanical drawing to ensure thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating - no routing or soldering allowed. |
| 2 (GND) | Analog ground reference | Primary return path for reference current; requires low-impedance connection to clean system ground plane. |
| 3 (EN) | Enable control input | Active-high logic input; VIH ≥65% VIN, VIL ≤35% VIN - compatible with 1.8 V/3.3 V GPIO without level shifting. |
| 4 (VIN) | Input supply | Accepts 2.2 V to 5.5 V; minimum headroom of 400 mV above VREF required for regulation. |
| 5 (VREF) | Precision output | 1.8 V reference source; stable with 0–10 µF ceramic capacitive loads; CIN ≥0.1 µF required on VIN. |
Key Features
| Feature | Design Value |
|---|---|
| 0.1% Initial Accuracy (A-grade) | Guaranteed at shipment - eliminates post-manufacturing trimming for cost-sensitive production calibration. |
| Stable Without Output Capacitor | Operates robustly with COUT = 0 µF - reduces BOM count and PCB area in space-constrained designs. |
| Low ESR Ceramic Capacitor Support | Validated with X5R/X7R types - avoids costly tantalum or polymer caps while ensuring transient response. |
| Indefinite Short-Circuit Protection | Limits output to 75 mA during fault - prevents device destruction and enables safe recovery without external fusing. |
| AEC-Q100 Grade 1 Qualified | Rated for −40°C to +125°C operation - meets automotive electronics reliability requirements without derating. |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld multimeter sampling analog front-end with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for ADC VREF input and analog signal conditioning bias. Use Value: Enables ±0.1% measurement accuracy across temperature with <170 µVPP noise floor. |
Use Scenario: Portable gas analyzer using electrochemical sensors and low-power microcontroller. IC Role / Device Role / Timing Role: Supplies precision bias voltage for sensor excitation and ADC reference under variable battery voltage. Use Value: Maintains calibration integrity over 2.2–4.2 V input range with 60 µA quiescent current extending battery life. |
| Automotive Sensor Modules | Industrial Process Controllers |
Use Scenario: Engine control unit (ECU) subsystem monitoring throttle position and coolant temperature. IC Role / Device Role / Timing Role: Delivers AEC-Q100-compliant 1.8 V reference for analog sensor signal conditioning and diagnostic ADCs. Use Value: Ensures <75 ppm/°C drift over −40°C to +125°C ambient, meeting ASIL-B functional safety margins. |
Use Scenario: DIN-rail mounted PLC analog I/O module acquiring 4–20 mA loop signals. IC Role / Device Role / Timing Role: Serves as isolated reference for precision current-to-voltage conversion and 24-bit sigma-delta ADC. Use Value: Supports 0.01% system accuracy with long-term stability of ≤50 ppm over 1000 hours. |
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, 100 ppm/°C, 50 µA IQ, SOT-23-5 - lower quiescent current but looser accuracy and tempco. | Best suited for cost-sensitive industrial sensors where ±0.2% tolerance is acceptable. | Select when ultra-low IQ (<50 µA) outweighs need for 0.1% accuracy or automotive qualification. |
| ADR3418ARJZ-R7 | 1.8 V, ±0.1% initial accuracy, 50 ppm/°C, 120 µA IQ, SOT-23-5 - tighter tempco but higher supply current and no enable pin. | Ideal for high-stability medical instrumentation requiring <50 ppm/°C drift, but lacks shutdown capability. | Choose when thermal stability is paramount and continuous operation is acceptable; verify layout compatibility with no EN pin. |
Compared with REF3018AIDBZR and ADR3418ARJZ-R7, LM4128AMFX-1.8/NOPB uniquely combines AEC-Q100 Grade 1 qualification, 0.1% accuracy, 75 ppm/°C tempco, and active enable control - making it optimal for automotive and portable industrial systems needing both precision and power-state flexibility.
Availability
LM4128AMFX-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, and industrial process controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4128AMFX-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 specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and automotive-grade component validation.
The LM4128 product line delivers micropower, high-accuracy series voltage references for battery-operated and thermally demanding applications - engineered specifically for instrumentation, automotive, and industrial systems requiring long-term stability and wide-temperature operation.
FAQ
What is the maximum input voltage for LM4128AMFX-1.8/NOPB?
The LM4128AMFX-1.8/NOPB supports a maximum input voltage of 5.5 V across its full operating temperature range. This limit is specified in the Absolute Maximum Ratings table and applies regardless of load or enable state. Exceeding 5.5 V risks permanent damage to the internal band-gap circuitry and ESD protection structures. Always maintain VIN within 2.2 V to 5.5 V for reliable regulation.
Does LM4128AMFX-1.8/NOPB require an input capacitor?
Yes, LM4128AMFX-1.8/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) connected between VIN and GND. The datasheet explicitly states CIN is mandatory for stable operation and specifies CIN ≥ COUT when an output capacitor is used. Omitting CIN may cause oscillation or startup failure, especially under varying load or input conditions.
What is the function of Pin 1 (N/C) on LM4128AMFX-1.8/NOPB?
Pin 1 on LM4128AMFX-1.8/NOPB is designated N/C (No Connect) and must remain electrically floating - no trace, pad, or solder connection should be made. TI's datasheet confirms this pin has no internal bond wire or circuit connection. Routing or grounding Pin 1 may introduce parasitic coupling or mechanical stress that degrades reference accuracy or long-term stability.
Can LM4128AMFX-1.8/NOPB drive a 10 µF capacitive load?
Yes, LM4128AMFX-1.8/NOPB is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR ceramic types. This capability is confirmed in the "Features" section and validated in typical performance curves (e.g., Figure 13 Load Transient Response). No external compensation is needed, simplifying design for fast-load-switching applications like multiplexed ADC references.
Is LM4128AMFX-1.8/NOPB qualified for automotive applications?
Yes, LM4128AMFX-1.8/NOPB is AEC-Q100 Grade 1 qualified (−40°C to +125°C junction temperature), as documented in TI's official packaging addendum and datasheet Features section. This qualification covers stress testing for temperature cycling, humidity, and lifetime reliability - confirming suitability for under-hood and cabin automotive electronics without additional qualification effort.
LM4128AMFX-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:
- ±0.1%
- Temperature Coefficient:
- 75ppm/°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
LM4128AMFX-1.8/NOPB FAQ
1.How can I place an order for LM4128AMFX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMFX-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 LM4128AMFX-1.8/NOPB reliable?
The price and inventory of LM4128AMFX-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 LM4128AMFX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AMFX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMFX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMFX-1.8/NOPB?
LM4128AMFX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMFX-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 LM4128AMFX-1.8/NOPB?
For technical support, including LM4128AMFX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMFX-1.8/NOPB requirements.
6.How does Aetrix verify that LM4128AMFX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AMFX-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 LM4128AMFX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AMFX-1.8/NOPB?
All LM4128AMFX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMFX-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 LM4128AMFX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4128AMFX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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