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Texas Instruments LM4128DMFX-1.8/NOPB
- Part No.:
- LM4128DMFX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMFX-1.8/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,876
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Product details
Overview
LM4128DMFX-1.8/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) 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 supports up to 20 mA load, features enable control for 3–7 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 LM4128DMFX-1.8/NOPB datasheet, LM4128DMFX-1.8/NOPB pinout, LM4128DMFX-1.8/NOPB application, or LM4128DMFX-1.8/NOPB equivalent, key selection criteria include its 1.8 V fixed output, low dropout (400 mV @10 mA), stability with capacitive loads up to 10 µF, and absence of required external output capacitor - enabling compact, low-power analog front-end designs.
Technical Context
The LM4128DMFX-1.8/NOPB uses an internal band-gap-derived reference architecture optimized for micropower operation. Its enable pin controls a high-impedance shutdown state, reducing quiescent current to ≤7 µA while maintaining fast turn-on time (~33 µs with 1 µF load). The device achieves stable regulation without mandatory output capacitance but remains robust with ceramic COUT up to 10 µF.
It operates across VIN = VREF + 400 mV to 5.5 V, supporting wide input headroom in low-voltage systems. Load regulation is specified at 25–120 ppm/mA and line regulation at 30 ppm/V over full temperature range, ensuring consistent reference integrity under varying supply and load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.5% initial accuracy (C-grade) - ensures 9 mV absolute tolerance at room temperature for 12-bit ADC biasing. |
| Temperature Coefficient | 100 ppm/°C max - contributes ≤180 µV drift over −40°C to +125°C, critical for precision sensor signal chains. |
| Supply Current | 60 µA typical - enables multi-year battery life in always-on portable measurement devices. |
| Shutdown Current | 3–7 µA - allows aggressive power gating in duty-cycled systems without sacrificing wake-up speed. |
| Dropout Voltage | 400 mV max @10 mA - permits operation from 2.2 V supply, compatible with single Li-ion or dual alkaline cells. |
| Output Noise (0.1–10 Hz) | 170 µVPP - supports high-resolution (<16-bit) analog-to-digital conversion without added filtering. |
| Load Current Capability | 20 mA max - drives multiple op-amp bias networks or SAR ADC reference inputs directly. |
Pinout & Package
LM4128DMFX-1.8/NOPB is housed in a 5-pin SOT-23 (DBV) package per JEDEC MO-178AB, with 0.95 mm pitch and exposed pad not connected internally. Pin 1 is N/C (no connect); pins must be routed per TI's DBV footprint recommendation to minimize thermal stress and parasitic coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating - no routing or solder mask opening required. |
| 2 (GND) | Analog ground reference | Primary return path for reference current; requires low-impedance connection to clean system AGND 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 shifters. |
| 4 (VIN) | Input supply rail | Accepts 2.2 V to 5.5 V; requires ≥0.1 µF X5R/X7R ceramic CIN placed within 2 mm of pin. |
| 5 (VREF) | Precision output terminal | Delivers regulated 1.8 V; stable with 0–10 µF capacitive loads - eliminates need for output capacitor in space-constrained layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.8 V output | Optimized for 1.8 V logic domains and low-voltage ADC/DAC references - avoids external resistor dividers and associated error sources. |
| Enable-controlled shutdown | Reduces supply current to ≤7 µA while preserving output state integrity - enables rapid wake-up (<100 µs) without re-stabilization delay. |
| No mandatory output capacitor | Stable with 0 µF COUT - simplifies BOM, reduces PCB area, and eliminates ESR-related instability risks in ultra-low-power designs. |
| Low thermal hysteresis | 75 ppm max - minimizes repeatability error after thermal cycling, essential for calibration-critical test equipment. |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault - prevents damage during board bring-up or transient overloads without external current limiting. |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld multimeter sampling 16-bit sigma-delta ADC with on-board sensor excitation. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for ADC and analog front-end op-amps. Use Value: 100 ppm/°C tempco and 170 µVPP noise ensure <±0.01% measurement accuracy across operating temperature range. |
Use Scenario: Wireless environmental sensor node logging temperature/humidity with 12-bit SAR ADC. IC Role / Device Role / Timing Role: Supplies precision reference for ADC and bias network of low-noise amplifiers. Use Value: 60 µA quiescent current extends coin-cell battery life beyond 5 years in sleep-dominated operation. |
| Industrial Process Monitoring | Medical Point-of-Care Devices |
Use Scenario: DIN-rail mounted transmitter converting 4–20 mA loop signals to digital output via isolated ADC. IC Role / Device Role / Timing Role: Serves as primary reference for isolated ADC and DAC in analog signal conditioning stage. Use Value: 400 mV dropout enables direct operation from 3.3 V isolated supply, eliminating LDO overhead and improving efficiency. |
Use Scenario: Portable blood glucose meter requiring repeatable electrochemical sensor measurements. IC Role / Device Role / Timing Role: Delivers stable 1.8 V reference for transimpedance amplifier and ADC reference input. Use Value: ±0.5% initial accuracy and 50 ppm long-term stability ensure clinical-grade repeatability over device lifetime. |
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, 50 µA IQ, SOT-23-3 - no enable pin, 3-pin package. | Lacks shutdown control; suited for always-on, ultra-low-noise applications where enable functionality is unnecessary. | Select REF3018AIDBZR when board space is constrained and shutdown is not required - saves one PCB trace and one GPIO. |
| ADR3418ARTZ-R7 | 1.8 V, ±0.1% initial accuracy (A-grade), 30 ppm/°C, 120 µA IQ, SOT-23-5 - includes enable, higher precision/tempco than LM4128DMFX-1.8/NOPB. | Higher accuracy and lower tempco suit metrology-grade systems; higher IQ limits battery life in ultra-low-power use cases. | Select ADR3418ARTZ-R7 when 0.1% accuracy and 30 ppm/°C tempco are mandatory - accept 2× higher supply current for enhanced stability. |
Compared with REF3018AIDBZR and ADR3418ARTZ-R7, LM4128DMFX-1.8/NOPB offers the optimal balance of C-grade accuracy (±0.5%), enable functionality, and ultra-low 60 µA supply current - making it uniquely suitable for cost-sensitive, battery-operated industrial sensors where moderate precision and active power management are both required.
Availability
LM4128DMFX-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered medical devices, and industrial process monitoring requiring stable component supply with guaranteed long-term availability.
Supply support for LM4128DMFX-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 analog IC design and manufacturing.
LM4128DMFX-1.8/NOPB belongs to TI's LM4128 precision micropower voltage reference product line, engineered specifically for space-constrained, low-power applications demanding stable reference performance across automotive and industrial temperature ranges.
FAQ
What is the initial accuracy specification for LM4128DMFX-1.8/NOPB?
The LM4128DMFX-1.8/NOPB is a C-grade device with ±0.5% initial output voltage accuracy at 25°C, meaning its 1.8 V output falls between 1.791 V and 1.809 V under standard test conditions. This grade is confirmed by TI's official datasheet SNVS475E and applies across the full −40°C to +125°C junction temperature range for worst-case design margining.
Does LM4128DMFX-1.8/NOPB require an external output capacitor?
No, LM4128DMFX-1.8/NOPB is designed to operate stably without an external output capacitor. It remains stable with capacitive loads up to 10 µF, allowing designers to omit COUT entirely in space- or cost-sensitive layouts. An input capacitor (≥0.1 µF ceramic) is mandatory, but COUT is strictly optional per TI's application guidance in SNVS475E.
What is the maximum input voltage for LM4128DMFX-1.8/NOPB?
The absolute maximum input voltage for LM4128DMFX-1.8/NOPB is 6 V, but the recommended operating maximum is 5.5 V. For reliable regulation, VIN must be at least VREF + 400 mV (i.e., ≥2.2 V) at 10 mA load. Operation below this dropout threshold causes output voltage collapse, as defined in the Electrical Characteristics table of SNVS475E.
How does the enable pin function on LM4128DMFX-1.8/NOPB?
The EN pin on LM4128DMFX-1.8/NOPB is an active-high digital control input. When pulled ≥65% of VIN, the device operates normally; when held ≤35% of VIN, it enters shutdown with supply current reduced to 3–7 µA. The internal pull-up (~2 µA) allows direct connection to VIN for always-on operation, or to a microcontroller GPIO for dynamic power control.
Is LM4128DMFX-1.8/NOPB qualified for automotive applications?
No, LM4128DMFX-1.8/NOPB is not AEC-Q100 qualified. Only the LM4128AQ/BQ/CQ/DQ variants (e.g., LM4128CQDMFX-1.8/NOPB) carry AEC-Q100 Grade 1 qualification. The "D" in LM4128DMFX-1.8/NOPB denotes C-grade accuracy, not automotive qualification - this distinction is explicitly stated in TI's SNVS475E datasheet and packaging addendum.
LM4128DMFX-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:
- ±1%
- 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
LM4128DMFX-1.8/NOPB FAQ
1.How can I place an order for LM4128DMFX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMFX-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 LM4128DMFX-1.8/NOPB reliable?
The price and inventory of LM4128DMFX-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 LM4128DMFX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DMFX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMFX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMFX-1.8/NOPB?
LM4128DMFX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMFX-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 LM4128DMFX-1.8/NOPB?
For technical support, including LM4128DMFX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMFX-1.8/NOPB requirements.
6.How does Aetrix verify that LM4128DMFX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DMFX-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 LM4128DMFX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DMFX-1.8/NOPB?
All LM4128DMFX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMFX-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 LM4128DMFX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4128DMFX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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