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Texas Instruments LM4128AMFX-4.1/NOPB
- Part No.:
- LM4128AMFX-4.1/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128AMFX-4.1/NOPB.pdf
- Description:
- IC VREF SERIES 0.1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,040
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Product details
Overview
LM4128AMFX-4.1/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 4.096 V output with ±0.1% initial accuracy (A-grade), 75 ppm/°C max temperature coefficient, and 60 µA supply current. It supports 20 mA output load, features enable control for 3 µA shutdown mode, and operates from −40°C to +125°C - ideal for high-resolution ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4128AMFX-4.1/NOPB datasheet, LM4128AMFX-4.1/NOPB pinout, LM4128AMFX-4.1/NOPB application, or LM4128AMFX-4.1/NOPB equivalent, key selection criteria include guaranteed A-grade accuracy over full temperature range, dropout voltage ≤400 mV at 10 mA, stability with up to 10 µF capacitive loads, and no external stabilization capacitor required.
Technical Context
The LM4128AMFX-4.1/NOPB uses an advanced band-gap-derived architecture optimized for low quiescent current and minimal thermal drift. Its enable pin controls internal regulation circuitry, allowing fast transition between 60 µA active and 3 µA shutdown states without external sequencing.
It achieves stable operation with ceramic input capacitors ≥0.1 µF and optional output capacitors up to 10 µF, eliminating need for external compensation. Line regulation is specified at 100 ppm/V and load regulation at 25–120 ppm/mA across −40°C to +125°C, supporting precision analog signal chains in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal, ±0.1% initial tolerance (A-grade) - enables direct interface with 12-bit ADCs requiring 1 LSB = 1 mV full-scale reference |
| Tempco | 75 ppm/°C max - ensures ≤±0.5 mV drift over −40°C to +125°C, critical for uncalibrated industrial sensor front-ends |
| Supply Current | 60 µA typical - allows >1-year battery life in coin-cell powered data loggers drawing <10 µA average system current |
| Shutdown Current | 3 µA max - reduces standby power by 20× vs active mode, enabling duty-cycled precision measurement systems |
| Dropout Voltage | 175–400 mV at 10 mA - supports operation from single Li-ion cell (3.0–4.2 V) while maintaining regulation down to 4.271 V input |
| Noise (0.1–10 Hz) | 350 µVPP - limits quantization uncertainty to <0.1 LSB in 16-bit 4.096 V full-scale systems |
| Output Current | 20 mA max - drives multiple op-amp bias networks or SAR ADC reference inputs without external buffering |
Pinout & Package
LM4128AMFX-4.1/NOPB is housed in a 5-pin SOT-23 (DBV) package with 0.95 mm pitch, JEDEC MO-178AA compliant, and RoHS-compliant matte tin 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 floating; no internal connection - avoids unintended parasitic paths in high-impedance reference nodes |
| 2 - GND | Analog ground reference | Low-impedance return path for reference current; requires dedicated ground plane tie to minimize noise coupling |
| 3 - EN | Active-high enable input | Drives internal regulator when ≥65% of VIN; pulls to VIN or microcontroller GPIO - enables precise power sequencing |
| 4 - VIN | Input supply rail | Accepts 4.496–5.5 V (VREF + 400 mV min); must be bypassed with ≥0.1 µF X5R/X7R ceramic capacitor |
| 5 - VREF | Precision output voltage | 4.096 V source with 20 mA sink capability; connects directly to ADC REF+ or DAC VREF pins without series resistance |
Key Features
| Feature | Design Value |
|---|---|
| Stable without external compensation | Eliminates need for output capacitor - simplifies layout and reduces BOM count in space-constrained portable designs |
| Capacitive load tolerance | Remains stable with up to 10 µF ceramic output capacitance - improves transient response during multiplexed ADC sampling |
| Indefinite short-circuit protection | Limits output current to 75 mA - prevents damage during board-level test or accidental probe shorts |
| Low ESR ceramic compatibility | Validated with X5R/X7R dielectrics - avoids instability risks associated with high-ESR tantalum or aluminum electrolytics |
| Thermal hysteresis | 75 ppm max - ensures repeatable output after thermal cycling, essential for calibration-critical metrology equipment |
Applications
| Portable Data Acquisition | Automotive Sensor Conditioning |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter acquiring 16-bit voltage readings at 1 kSPS. IC Role / Device Role / Timing Role: Primary reference for SAR ADC and analog front-end gain-setting resistors. Use Value: 4.096 V output matches 16-bit full-scale resolution (1 LSB = 62.5 µV); 60 µA supply current extends 2xAA battery life to >18 months. |
Use Scenario: Engine control unit measuring exhaust gas oxygen sensor output under wide ambient temperature swings. IC Role / Device Role / Timing Role: Stable bias reference for programmable gain amplifier and ratiometric ADC reference. Use Value: 75 ppm/°C tempco and −40°C to +125°C operation ensure <±1 LSB error across full vehicle operating range without software calibration. |
| Medical Patient Monitor | Industrial PLC Analog Input Module |
|
Use Scenario: Portable ECG device digitizing biopotential signals with 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Low-noise reference for ADC and precision op-amp offset nulling. Use Value: 350 µVPP (0.1–10 Hz) noise contributes <0.05% of full-scale noise floor, preserving diagnostic signal fidelity. |
Use Scenario: DIN-rail mounted PLC module converting 4–20 mA field signals to digital with galvanic isolation. IC Role / Device Role / Timing Role: Isolated-side reference for isolated ADC and loop-powered transmitter biasing. Use Value: Enable pin allows synchronized wake-up with microcontroller, reducing system idle power by 95% during polling intervals. |
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, 100 ppm/°C, 50 µA supply current, SOT-23-5 | Lower supply current but looser accuracy and higher tempco - suitable where cost sensitivity outweighs 12-bit ADC requirements | Select REF3040AIDBZR only if system tolerates ±0.8 mV reference error at 25°C and ±4.1 mV drift over temperature. |
| ADR3440ARJZ-R7 | 4.096 V, ±0.1% initial accuracy, 50 ppm/°C, 120 µA supply current, SOT-23-5 | Superior tempco and noise (12 µVRMS) but double supply current - preferred for ultra-stable lab-grade instruments | Choose ADR3440ARJZ-R7 when long-term stability (<10 ppm/1000 hrs) and sub-ppm thermal hysteresis are mandatory. |
Compared with REF3040AIDBZR and ADR3440ARJZ-R7, LM4128AMFX-4.1/NOPB delivers optimal balance of A-grade accuracy, ultra-low 60 µA quiescent current, and proven 10 µF capacitive load stability - making it the preferred choice for battery-operated 12–16-bit data acquisition where power and size are constrained.
Availability
LM4128AMFX-4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, medical patient monitors, and industrial PLC analog input circuits requiring stable component supply with guaranteed A-grade specifications.
Supply support for LM4128AMFX-4.1/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 analog IC design and high-volume manufacturing.
LM4128AMFX-4.1/NOPB belongs to TI's precision micropower voltage reference product line, engineered specifically for space-constrained, battery-powered systems demanding high initial accuracy, low drift, and minimal quiescent current.
FAQ
What is the guaranteed initial accuracy of LM4128AMFX-4.1/NOPB over temperature?
The LM4128AMFX-4.1/NOPB is an A-grade device with guaranteed ±0.1% initial output voltage accuracy at 25°C, and its temperature coefficient is ensured ≤75 ppm/°C over −40°C to +125°C. This means total error remains within ±0.1% + (75 ppm/°C × 165°C) ≈ ±0.22% across the full operating range - sufficient for 12-bit system accuracy without calibration.
Can LM4128AMFX-4.1/NOPB operate without an output capacitor?
Yes, LM4128AMFX-4.1/NOPB is explicitly designed to be stable without an output capacitor, per TI's SNVS475E datasheet. An input capacitor (≥0.1 µF ceramic) is mandatory, but COUT is optional. Adding up to 10 µF ceramic COUT improves load transient response - especially useful in multiplexed ADC applications - but does not affect basic regulation stability.
What is the minimum input voltage required for LM4128AMFX-4.1/NOPB at 10 mA load?
The minimum input voltage for LM4128AMFX-4.1/NOPB at 10 mA load is VREF + 400 mV = 4.496 V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Dropout voltage is tested at 175–400 mV depending on temperature and load, ensuring regulation is maintained down to this threshold with ≤0.5% output deviation.
How does the enable pin (EN) function on LM4128AMFX-4.1/NOPB?
The EN pin on LM4128AMFX-4.1/NOPB is an active-high control that enables internal regulation when driven ≥65% of VIN (VIH) and disables it below 35% of VIN (VIL). In shutdown, supply current drops to ≤7 µA. The pin has an internal ~2 µA pull-up, so tying EN to VIN provides always-on operation, while connecting to a microcontroller GPIO enables precise power-gating control in LM4128AMFX-4.1/NOPB-based systems.
Is LM4128AMFX-4.1/NOPB suitable for driving ADC reference inputs directly?
Yes, LM4128AMFX-4.1/NOPB is rated for up to 20 mA output current and exhibits low 350 µVPP (0.1–10 Hz) noise - making it suitable for direct connection to precision SAR and delta-sigma ADC reference inputs. Its low output impedance and load regulation (25–120 ppm/mA) ensure minimal code-dependent errors, and the 4.096 V output aligns exactly with common 12-bit and 16-bit full-scale ranges.
LM4128AMFX-4.1/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:
- ±0.1%
- Temperature Coefficient:
- 75ppm/°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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128AMFX-4.1/NOPB FAQ
1.How can I place an order for LM4128AMFX-4.1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128AMFX-4.1/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 LM4128AMFX-4.1/NOPB reliable?
The price and inventory of LM4128AMFX-4.1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128AMFX-4.1/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128AMFX-4.1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128AMFX-4.1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128AMFX-4.1/NOPB?
LM4128AMFX-4.1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128AMFX-4.1/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 LM4128AMFX-4.1/NOPB?
For technical support, including LM4128AMFX-4.1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128AMFX-4.1/NOPB requirements.
6.How does Aetrix verify that LM4128AMFX-4.1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128AMFX-4.1/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 LM4128AMFX-4.1/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128AMFX-4.1/NOPB?
All LM4128AMFX-4.1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128AMFX-4.1/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 LM4128AMFX-4.1/NOPB part is unused and in its original packaging.
Return procedure for LM4128AMFX-4.1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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