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Texas Instruments LM4128DMF-2.0/NOPB
- Part No.:
- LM4128DMF-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMF-2.0/NOPB.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,899
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Product details
Overview
LM4128DMF-2.0/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.048 V output with ±0.5% initial accuracy (C grade), 100 ppm/°C max temperature coefficient, and 60 µA supply current. It supports 0–20 mA load current, features an enable pin for 3–7 µA shutdown mode, and operates from −40°C to +125°C - ideal for portable instrumentation and battery-powered data acquisition systems.
For engineers reviewing the LM4128DMF-2.0/NOPB datasheet, LM4128DMF-2.0/NOPB pinout, LM4128DMF-2.0/NOPB application, or LM4128DMF-2.0/NOPB equivalent, key selection criteria include output voltage tolerance at temperature extremes, dropout voltage under 10 mA load, stability with ceramic capacitive loads up to 10 µF, and compatibility with low-ESR bypassing for noise-sensitive ADC reference rails.
Technical Context
The LM4128DMF-2.0/NOPB uses an internal band-gap-derived reference core with active error correction, enabling stable 2.048 V output without external compensation. Its enable input controls a high-impedance shutdown path that reduces quiescent current to ≤7 µA while maintaining fast 33–79 µs turn-on time depending on load capacitance.
Designed for series topology, it requires only a minimum 0.1 µF input capacitor (CIN ≥ COUT), supports VIN as low as VREF + 400 mV (i.e., ≥2.448 V at 10 mA), and maintains regulation across line (30 ppm/V), load (25–120 ppm/mA), and thermal (100 ppm/°C max) variations - all verified over −40°C to +125°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048 V nominal; ±0.5% initial accuracy (C grade) ensures ≤±10.24 mV absolute error at 25°C |
| Tempco | 100 ppm/°C max (C grade); ≤±25.6 mV drift over −40°C to +125°C operating range |
| Supply Current | 60–100 µA typical; enables >1-year battery life in 10 µA-systems with intermittent wake-up |
| Shutdown Current | 3–7 µA with EN = 0 V; reduces power by >90% vs active mode during idle periods |
| Dropout Voltage | 175–400 mV at 10 mA load; allows operation from single-cell Li-ion (3.0 V min) or 3.3 V rail with margin |
| Noise (0.1–10 Hz) | 190 µVPP; suitable for 12-bit to 14-bit SAR ADCs without additional filtering |
| Load Current | Up to 20 mA output; drives ADC reference inputs, DAC buffers, and op-amp bias networks directly |
Pinout & Package
LM4128DMF-2.0/NOPB is housed in a 5-pin SOT-23 (DBV) package - RoHS-compliant, lead-finished with matte tin, MSL Level-1, and marked "R5BA" on top. The package measures 2.9 mm × 1.6 mm × 1.15 mm and is optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - N/C | No-connect terminal | Must remain unconnected and floating; no internal connection or function |
| 2 - GND | Analog ground reference | Primary return path for reference core and enable circuitry; requires low-impedance PCB tie to system AGND |
| 3 - EN | Active-high enable control | Pulled internally to VIN via ~2 µA source; driven low (<35% VIN) to enter shutdown |
| 4 - VIN | Input supply rail | Accepts 2.448 V to 5.5 V; must exceed VREF + 400 mV for full-load regulation |
| 5 - VREF | Precision output terminal | Delivers regulated 2.048 V; stable with 0–10 µF capacitive loads including low-ESR ceramics |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable with zero output capacitance; eliminates BOM cost and layout area for COUT |
| Capacitive load drive | Guaranteed stability with up to 10 µF ceramic load - improves transient response in multiplexed ADC systems |
| Low dropout operation | Operates down to VIN = VREF + 400 mV - enables use with low-voltage batteries and LDO-fed rails |
| Indefinite short-circuit protection | Current-limited to 75 mA during output fault - prevents damage during board-level test or miswiring |
| Thermal hysteresis | 75 ppm max over −40°C ↔ +125°C cycling - preserves calibration integrity in thermally cycled environments |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitoring node sampling temperature, humidity, and pressure every 5 minutes. IC Role / Device Role / Timing Role: Provides stable 2.048 V reference for 12-bit SAR ADC and microcontroller VREF input. Use Value: Enables <1 µA sleep current and ±0.5 LSB accuracy over −25°C to +70°C ambient - meeting IEC 60751 Class B RTD requirements. | Use Scenario: 4–20 mA loop-powered transmitter conditioning analog sensor signals in factory automation. IC Role / Device Role / Timing Role: Supplies precision reference for current-loop DAC and signal-conditioning op-amps. Use Value: Delivers 100 ppm/°C stability and 190 µVPP noise - ensuring <0.1% full-scale error across 0–60°C cabinet temperature swing. |
| Medical Patient Monitors | Test & Measurement Equipment |
Use Scenario: Portable ECG front-end acquiring biopotential signals with 16-bit resolution. IC Role / Device Role / Timing Role: Reference source for anti-aliasing filter op-amps and ADC reference buffer. Use Value: Low 60 µA supply current extends single-charge battery life; 2.048 V matches common 12-bit/16-bit ADC full-scale codes. | Use Scenario: Benchtop multimeter performing auto-ranging DC voltage measurements from 100 mV to 10 V. IC Role / Device Role / Timing Role: Primary reference for internal 20-bit delta-sigma ADC and calibration DAC. Use Value: 0.5% initial accuracy and 50 ppm long-term stability over 1000 hrs support annual recalibration intervals per ISO/IEC 17025. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3020AIDBZR | 2.048 V, ±0.2% initial accuracy (A grade), 50 ppm/°C tempco, 50 µA IQ, SOT-23-3 | 3-pin package lacks enable; no shutdown mode; lower noise (120 µVPP) | Select when ultra-low drift and minimal quiescent current outweigh need for power gating |
| MAX6029AEUR+T | 2.048 V, ±0.2% initial accuracy, 75 ppm/°C tempco, 35 µA IQ, SC70-5 | Smaller SC70-5 footprint; higher PSRR (70 dB @ 1 kHz); no indefinite short-circuit protection | Select when board space is critical and short-circuit exposure is mitigated externally |
Compared with REF3020AIDBZR and MAX6029AEUR+T, LM4128DMF-2.0/NOPB uniquely combines enable-controlled shutdown, 20 mA drive capability, and guaranteed stability with 10 µF loads - making it optimal for systems requiring dynamic power management and robust load interface.
Availability
LM4128DMF-2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical patient monitors requiring stable component supply with automotive-grade reliability and extended temperature support.
Supply support for LM4128DMF-2.0/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 ICs and voltage references.
The LM4128 product line delivers micropower, low-drift series voltage references for space-constrained, battery-operated, and high-reliability applications - designed specifically for instrumentation, data acquisition, and industrial sensing where accuracy and thermal stability are critical.
FAQ
What is the output voltage tolerance of LM4128DMF-2.0/NOPB over temperature?
The LM4128DMF-2.0/NOPB (C grade) has a maximum temperature coefficient of 100 ppm/°C over −40°C to +125°C, resulting in ≤±25.6 mV total deviation from 2.048 V across its full operating range. This is confirmed in the Electrical Characteristics table for LM4128-2.0 under TCVREF/°C limits and applies specifically to the DMF-2.0 variant.
Does LM4128DMF-2.0/NOPB require an external output capacitor?
No, LM4128DMF-2.0/NOPB is stable without an output capacitor and does not require COUT for basic operation. However, adding a 0.1–10 µF ceramic capacitor between VREF and GND improves load transient response - especially when driving switching ADCs or multiplexed sensor channels. Input capacitor CIN (≥0.1 µF) remains mandatory.
What is the minimum input voltage needed for LM4128DMF-2.0/NOPB to regulate at full 20 mA load?
LM4128DMF-2.0/NOPB requires VIN ≥ VREF + 400 mV = 2.448 V to maintain regulation at 10 mA load; at 20 mA, dropout increases slightly but remains within 400 mV per datasheet. Therefore, 2.45 V is the practical minimum for full-load operation, verified in the Dropout Voltage specification for LM4128-2.0 under ILOAD = 10 mA conditions.
How does the enable pin (EN) function on LM4128DMF-2.0/NOPB?
The EN pin on LM4128DMF-2.0/NOPB is active-high with internal ~2 µA pull-up to VIN. Driving EN <35% of VIN disables the reference and reduces supply current to 3–7 µA. Leaving EN unconnected or tying it to VIN enables normal operation. EN must never exceed VIN, as specified in Absolute Maximum Ratings and Enable Transfer Characteristics.
Is LM4128DMF-2.0/NOPB suitable for driving ADC reference inputs directly?
Yes, LM4128DMF-2.0/NOPB delivers up to 20 mA output current and exhibits 190 µVPP (0.1–10 Hz) noise - sufficient for direct connection to 12-bit to 14-bit SAR and sigma-delta ADC reference pins. Its low output impedance and capacitive load stability eliminate need for external buffer op-amps in most precision measurement designs.
LM4128DMF-2.0/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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 190µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.448V ~ 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
LM4128DMF-2.0/NOPB FAQ
1.How can I place an order for LM4128DMF-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMF-2.0/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 LM4128DMF-2.0/NOPB reliable?
The price and inventory of LM4128DMF-2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128DMF-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128DMF-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMF-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMF-2.0/NOPB?
LM4128DMF-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMF-2.0/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 LM4128DMF-2.0/NOPB?
For technical support, including LM4128DMF-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMF-2.0/NOPB requirements.
6.How does Aetrix verify that LM4128DMF-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128DMF-2.0/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 LM4128DMF-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128DMF-2.0/NOPB?
All LM4128DMF-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMF-2.0/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 LM4128DMF-2.0/NOPB part is unused and in its original packaging.
Return procedure for LM4128DMF-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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