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Texas Instruments LM4128DMF-3.3
- Part No.:
- LM4128DMF-3.3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128DMF-3.3.pdf
- Description:
- IC VREF SERIES 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,475
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Product details
Overview
LM4128DMF-3.3 from Texas Instruments (formerly National Semiconductor) is a precision micropower series voltage reference in SOT-23-5 package, delivering 3.3 V output with ±1.0% initial accuracy and 100 ppm/°C temperature coefficient over −40°C to +125°C. It draws only 60 µA quiescent current, supports up to 20 mA load, and features an enable pin for 3 µA shutdown mode-ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128DMF-3.3 datasheet, LM4128DMF-3.3 pinout, LM4128DMF-3.3 application, or LM4128DMF-3.3 equivalent, key selection considerations include dropout voltage (≤400 mV at 10 mA), line regulation (85 ppm/V), load regulation (25–120 ppm/mA), noise performance (310 µVPP, 0.1–10 Hz), and compatibility with ceramic capacitive loads up to 10 µF without external stabilization.
Technical Context
The LM4128DMF-3.3 employs a band-gap-derived reference core optimized for low-power, high-stability operation in space-constrained designs. Its series architecture eliminates idle current waste typical of shunt references, enabling efficient use in battery-powered systems where supply current must remain below 100 µA across temperature and load.
It integrates an internal enable control path with defined VIH/VIL thresholds (65%/35% of VIN), supports input voltages from (VREF + 400 mV) to 5.5 V, and maintains stability with low-ESR ceramic capacitors-no external compensation required-even under capacitive loading up to 10 µF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±1.0% initial accuracy at 25°C - ensures ADC/DAC reference compliance in 12-bit systems (±2 LSB error) |
| Tempco | 100 ppm/°C max - limits drift to ±132 ppm over −40°C to +125°C (±0.43 mV total) |
| Quiescent Current | 60 µA typical - enables multi-year battery life in always-on sensor nodes drawing <100 µA average |
| Shutdown Current | 3 µA max - reduces system standby power by >95% when enabled via logic-level EN signal |
| Dropout Voltage | 400 mV max at 10 mA - allows operation from 3.7 V Li-ion cells down to 3.3 V under full load |
| Output Noise | 310 µVPP (0.1–10 Hz) - suitable for 16-bit SAR ADCs requiring <1 LSB noise floor at 3.3 V full scale |
| Line Regulation | 85 ppm/V - contributes ≤0.28 mV error across 3.7–5.5 V input range |
| Load Regulation | 25–120 ppm/mA - holds output within ±0.26 mV across 0–20 mA load variation |
Pinout & Package
SOT-23-5 package (NS package number MF05A), surface-mount, 1.6 mm × 2.9 mm footprint, 1.1 mm height, thermal resistance θJ-A = 220°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | N/C | No-connect pin; must be left floating - not internally bonded, no electrical function |
| 2 | GND | Analog ground reference; requires low-impedance PCB connection to minimize noise coupling |
| 3 | EN | Active-high enable input; pulls up internally (~2 µA); drives high to activate reference, low or open to enter 3 µA shutdown |
| 4 | VIN | Input supply rail; must exceed VREF + 400 mV (≥3.7 V) for regulation; max 5.5 V absolute rating |
| 5 | VREF | Precision 3.3 V output; capable of sourcing up to 20 mA; stable with 0–10 µF ceramic capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable operation with 0–10 µF ceramic loads - eliminates BOM cost and layout area for stabilization cap |
| Low dropout voltage | 400 mV max at 10 mA - enables direct regulation from single-cell Li-ion or 3.3 V system rails |
| Enable-controlled shutdown | Reduces supply current to ≤7 µA - critical for duty-cycled sensors and intermittent measurement systems |
| High temp grade support | −40°C to +125°C junction range - qualified for automotive engine bay and industrial motor control environments |
| Indefinite short-circuit protection | Limits output current to 75 mA - prevents damage during test fixture miswiring or board-level fault conditions |
Applications
| Portable Data Loggers | Industrial PLC Analog Inputs |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10-second intervals. IC Role / Device Role / Timing Role: Precision 3.3 V reference for 16-bit SAR ADC converting sensor signals with <±1 LSB total error budget. Use Value: 60 µA quiescent current extends CR2032 battery life beyond 3 years; 3 µA shutdown cuts background drain during sleep cycles. | Use Scenario: Modular analog input card in a DIN-rail mounted PLC accepting 4–20 mA current loop signals. IC Role / Device Role / Timing Role: Stable 3.3 V reference for isolated sigma-delta ADC measuring loop current with 0.1% full-scale accuracy. Use Value: 100 ppm/°C tempco ensures calibration holdover across −25°C to +70°C cabinet temperatures; SOT-23-5 saves board space in dense I/O modules. |
| Medical Patient Monitor Front-End | Automotive Body Control Module |
Use Scenario: ECG front-end amplifier stage requiring low-noise, stable biasing for differential instrumentation amplifiers. IC Role / Device Role / Timing Role: Low-noise (310 µVPP) 3.3 V reference supplying ADC and op-amp bias rails in analog signal chain. Use Value: 0.1–10 Hz noise performance avoids aliasing into ECG bandwidth (0.05–150 Hz); 125°C rating supports internal enclosure heating. | Use Scenario: Power window control module monitoring motor current and position feedback in passenger vehicles. IC Role / Device Role / Timing Role: Grade-D voltage reference powering microcontroller ADC and comparator circuits in AEC-Q100-compliant design. Use Value: D-grade (±1.0%) meets cost-sensitive automotive functional safety requirements; robust short-circuit protection handles motor stall faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3033AIDBZR | 3.3 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-3 - no enable pin, lower tempco, higher accuracy grade | Requires external enable circuitry if shutdown needed; better suited for high-precision metrology vs. cost-optimized industrial sensing | Select REF3033AIDBZR when long-term stability (<20 ppm/1k hrs) and tighter tempco outweigh need for integrated enable control. |
| MAX6029AEUR+T | 3.3 V, ±0.2% initial accuracy, 75 ppm/°C, 35 µA IQ, SOT-23-3 - no enable, lower IQ, higher PSRR | Lacks shutdown capability; superior power supply rejection makes it preferred in noisy switching regulator environments | Select MAX6029AEUR+T when operating from unfiltered DC-DC outputs and lowest possible supply current (35 µA) is critical. |
Compared with REF3033AIDBZR and MAX6029AEUR+T, the LM4128DMF-3.3 trades initial accuracy and tempco for integrated enable functionality and robust capacitive-load stability-making it optimal for battery-powered systems requiring programmable on/off control without added discrete logic.
Availability
LM4128DMF-3.3 is available at Aetrix Electronics and suitable for portable instrumentation, industrial PLC analog inputs, and automotive body control modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4128DMF-3.3 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 acquired National Semiconductor in 2011 and maintains full product support, datasheets, and application notes for the LM4128 family.
The LM4128 series was designed as a micropower, space-efficient precision voltage reference for battery-operated and thermally demanding applications-emphasizing low dropout, capacitor-free stability, and enable-controlled power gating.
FAQ
What is the maximum input voltage for LM4128DMF-3.3?
The absolute maximum input voltage for LM4128DMF-3.3 is 6 V, but the recommended operating maximum is 5.5 V. For proper regulation, VIN must be at least VREF + 400 mV (i.e., ≥3.7 V) when sourcing 10 mA. Exceeding 5.5 V risks permanent damage per Absolute Maximum Ratings, and operation above this limit voids parametric guarantees.
Does LM4128DMF-3.3 require an input capacitor?
Yes, LM4128DMF-3.3 requires a minimum 0.1 µF ceramic input capacitor (X5R/X7R) for stable operation. When an output capacitor is used, CIN must be ≥ COUT. Larger values (4.7–22 µF) reduce startup overshoot and improve noise rejection. The device is unstable without CIN, regardless of load conditions or enable state.
What is the shutdown behavior of LM4128DMF-3.3 when the EN pin is left floating?
When the EN pin is left floating, LM4128DMF-3.3 remains enabled due to its internal ~2 µA pull-up current source. To enter shutdown (3–7 µA supply current), EN must be actively driven below 35% of VIN (e.g., <1.3 V when VIN = 3.7 V). Floating EN is functionally equivalent to connecting EN to VIN.
Can LM4128DMF-3.3 drive a 10 µF ceramic capacitor directly at the output?
Yes, LM4128DMF-3.3 is explicitly characterized and guaranteed stable with capacitive loads up to 10 µF, including low-ESR ceramic types. This eliminates need for series isolation resistors or external compensation networks. Output capacitance improves load transient response but increases turn-on time (e.g., ~79 µs for 10 µF vs. ~33 µs for 1 µF).
What is the thermal hysteresis specification for LM4128DMF-3.3?
The thermal hysteresis of LM4128DMF-3.3 is 75 ppm - defined as the change in output voltage at 25°C before and after cycling between −40°C and +125°C. This equates to a maximum 0.248 mV shift (75 ppm × 3.3 V) and is independent of grade; all LM4128 variants share this value per datasheet Note 8.
LM4128DMF-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 310µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3.7V ~ 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-3.3 FAQ
1.How can I place an order for LM4128DMF-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128DMF-3.3 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-3.3 reliable?
The price and inventory of LM4128DMF-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128DMF-3.3 is usually 5 days.
3.What payment methods are accepted for LM4128DMF-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128DMF-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128DMF-3.3?
LM4128DMF-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128DMF-3.3 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-3.3?
For technical support, including LM4128DMF-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128DMF-3.3 requirements.
6.How does Aetrix verify that LM4128DMF-3.3 is sourced from the original manufacturer or authorized distributors?
All LM4128DMF-3.3 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-3.3 meets industry standards.
7.What is the process for return or replacement of LM4128DMF-3.3?
All LM4128DMF-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM4128DMF-3.3, 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-3.3 part is unused and in its original packaging.
Return procedure for LM4128DMF-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128DMF-3.3 Tags
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