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Texas Instruments LM4128BMF-3.3/NOPB
- Part No.:
- LM4128BMF-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMF-3.3/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,421
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Product details
Overview
LM4128BMF-3.3/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 3.3 V output with ±0.2% initial accuracy (Grade B), 75 ppm/°C temperature coefficient, and 60 µA supply current. It features an enable pin for 3 µA shutdown mode, supports up to 20 mA load, and operates from −40°C to +125°C - ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128BMF-3.3/NOPB datasheet, LM4128BMF-3.3/NOPB pinout, LM4128BMF-3.3/NOPB application, or LM4128BMF-3.3/NOPB equivalent, this page provides verified specifications, validated pin functions, confirmed thermal and load regulation performance, and two rigorously cross-checked alternative parts for precision analog design.
Technical Context
The LM4128BMF-3.3/NOPB uses an internal band-gap-derived reference core with active error correction to achieve low drift and high stability. Its series architecture eliminates need for external stabilization capacitors while maintaining stability with capacitive loads up to 10 µF.
It integrates an enable input with 35% VIN low-level threshold and 65% VIN high-level threshold, supporting seamless power gating. Dropout voltage is specified at 175–400 mV (10 mA load), enabling operation from low-headroom supplies such as single Li-ion cells or regulated 3.6 V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal, ±0.2% initial tolerance (Grade B) - ensures ≤±6.6 mV absolute error at 25°C for 12-bit ADC reference scaling. |
| Temperature Coefficient | 75 ppm/°C max - contributes ≤±24.8 ppm (≈±0.082 mV) drift over −40°C to +125°C operating range. |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA-sleep systems with periodic 3.3 V reference activation. |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces quiescent draw by >90% during idle intervals without external switch. |
| Load Regulation | 25–120 ppm/mA - maintains ≤±2.4 mV deviation across 0–20 mA load, critical for DAC buffer or sensor excitation circuits. |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from 3.475 V minimum input, compatible with 3.6 V Li-ion or LDO outputs. |
| Noise (0.1–10 Hz) | 310 µVPP - supports 16-bit resolution in low-frequency measurement paths without additional filtering. |
Pinout & Package
LM4128BMF-3.3/NOPB is housed in a 5-pin SOT-23 (DBV) package per JEDEC MO-178AB, with 0.95 mm pitch and 2.9 mm × 1.6 mm footprint. Pin 1 is marked with a dot; Pin 3 is EN, Pin 4 is VIN, Pin 5 is VREF - all pins are surface-mount compatible with standard reflow profiles (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must remain unconnected and floating; no internal connection - PCB pad may be omitted or left unmasked. |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference core and enable circuitry; requires low-impedance connection to clean AGND plane. |
| Pin 3 (EN) | Active-high enable control | Drives internal bias when ≥65% of VIN; pulls down to <35% VIN to enter 3–7 µA shutdown - compatible with GPIO or open-drain logic. |
| Pin 4 (VIN) | Input supply rail | Accepts 3.475–5.5 V (VREF + 400 mV min); must be bypassed with ≥0.1 µF ceramic capacitor (CIN) close to pin. |
| Pin 5 (VREF) | Precision 3.3 V output | Delivers stable 3.3 V to loads ≤20 mA; stable with optional COUT ≤10 µF; output noise 310 µVPP (0.1–10 Hz). |
Key Features
| Feature | Design Value |
|---|---|
| Grade B initial accuracy | ±0.2% (±6.6 mV) at 25°C - enables direct use in 12-bit SAR ADC reference without trimming. |
| Enable-controlled shutdown | Reduces supply current to 3–7 µA - eliminates need for external PMOS switch in duty-cycled sensor nodes. |
| Capacitor-free stability | Stable with no output capacitor; supports up to 10 µF COUT - simplifies layout and avoids ESR-related oscillation risks. |
| Low dropout operation | 175 mV typical dropout at 10 mA - permits use with 3.475 V minimum input, e.g., from buck converter or battery monitor rail. |
| Wide temperature range | −40°C to +125°C junction operation - qualified for automotive under-hood and industrial motor-control environments. |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld multimeter sampling analog inputs via 12-bit ADC with on-demand measurement bursts. IC Role / Device Role / Timing Role: Provides stable 3.3 V reference for ADC full-scale calibration and sensor signal conditioning. Use Value: ±0.2% initial accuracy and 75 ppm/°C tempco ensure ≤0.5 LSB error across operating temperature without recalibration. |
Use Scenario: Portable gas detector using electrochemical sensors requiring precise 3.3 V excitation and analog front-end biasing. IC Role / Device Role / Timing Role: Supplies regulated 3.3 V reference for transimpedance amplifier gain setting and ADC reference. Use Value: 60 µA quiescent current extends battery life; enable pin synchronizes reference activation with sensor read cycles. |
| Automotive Sensor Interface | Industrial Process Monitoring |
Use Scenario: Engine control unit monitoring coolant temperature and pressure via ratiometric sensors in under-hood environment. IC Role / Device Role / Timing Role: Generates 3.3 V reference for microcontroller ADC and analog sensor signal chain. Use Value: −40°C to +125°C operation and AEC-Q100-compliant LM4128Q family lineage support automotive qualification requirements. |
Use Scenario: PLC analog input module digitizing 4–20 mA loop signals with 16-bit resolution and long-term field deployment. IC Role / Device Role / Timing Role: Serves as primary voltage reference for precision DACs and ADCs in isolated I/O channels. Use Value: 50 ppm long-term stability (1000 hrs) and 75 ppm/°C tempco minimize calibration drift over years of continuous operation. |
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 tempco, 50 µA IQ, SOT-23-3 - no enable pin, 3-pin package. | Lacks shutdown control; requires external switch for low-power modes; smaller footprint but no EN functionality. | Select when board space is constrained and enable control is handled externally or not required. |
| ADR3433ARJZ-R7 | 3.3 V, ±0.1% initial accuracy, 10 ppm/°C tempco, 120 µA IQ, SOT-23-5 - higher precision, higher quiescent current. | Superior stability for metrology-grade systems; 2× supply current limits battery life in ultra-low-power designs. | Select when long-term drift and temperature stability outweigh quiescent current constraints. |
Compared with LM4128BMF-3.3/NOPB, REF3033AIDBZR saves board area but removes enable functionality, while ADR3433ARJZ-R7 improves accuracy and tempco at the cost of doubled supply current - choice depends on whether shutdown control, size, or ultimate stability dominates the system requirement.
Availability
LM4128BMF-3.3/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered test equipment, and automotive sensor interface applications requiring stable component supply, long-lifecycle support, and guaranteed Grade B parametric performance.
Supply support for LM4128BMF-3.3/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 high-reliability manufacturing.
The LM4128 series was engineered for space-constrained, low-power precision analog systems - targeting instrumentation, portable measurement, and automotive sensor interfaces where micropower operation and grade-specific accuracy are critical.
FAQ
What is the maximum load current supported by the LM4128BMF-3.3/NOPB?
The LM4128BMF-3.3/NOPB supports up to 20 mA output current while maintaining specified accuracy and regulation. At 10 mA load, dropout voltage is 175–400 mV; load regulation is 25–120 ppm/mA. Exceeding 20 mA triggers short-circuit protection limiting output to 75 mA indefinitely - ensuring safe operation under fault conditions without damage to the LM4128BMF-3.3/NOPB.
Does the LM4128BMF-3.3/NOPB require an input capacitor?
Yes - the LM4128BMF-3.3/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN) connected between VIN and GND. If an output capacitor (COUT) is used, CIN must be ≥ COUT. This capacitor stabilizes the internal regulator and suppresses supply noise; omitting it risks instability or degraded noise performance in the LM4128BMF-3.3/NOPB.
What is the enable pin behavior for the LM4128BMF-3.3/NOPB?
The EN pin of the LM4128BMF-3.3/NOPB is active-high with VIH ≥65% of VIN and VIL ≤35% of VIN. When pulled high (≥65% VIN), the device operates normally; when pulled low (<35% VIN), it enters shutdown with 3–7 µA supply current. The pin has an internal ~2 µA pull-up, so connecting EN directly to VIN enables continuous operation without external drive - a key feature distinguishing the LM4128BMF-3.3/NOPB from non-enable references.
How does the LM4128BMF-3.3/NOPB perform over temperature?
The LM4128BMF-3.3/NOPB maintains ±0.2% initial accuracy and 75 ppm/°C max temperature coefficient across −40°C to +125°C. Thermal hysteresis is 75 ppm, and long-term stability is 50 ppm over 1000 hours. These specs ensure predictable 3.3 V output in automotive and industrial environments - verified in the LM4128BMF-3.3/NOPB's Grade B characterization across full junction temperature range.
Is the LM4128BMF-3.3/NOPB RoHS compliant and lead-free?
Yes - the LM4128BMF-3.3/NOPB is RoHS compliant and features 100% matte tin (Sn) lead finish. It carries MSL Level-1 rating (260°C peak reflow, unlimited floor life) and is packaged in tape-and-reel (1000 units per reel). The "/NOPB" suffix explicitly denotes lead-free, RoHS-compliant packaging - confirmed in Texas Instruments' official packaging addendum for LM4128BMF-3.3/NOPB.
LM4128BMF-3.3/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):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°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
LM4128BMF-3.3/NOPB FAQ
1.How can I place an order for LM4128BMF-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMF-3.3/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 LM4128BMF-3.3/NOPB reliable?
The price and inventory of LM4128BMF-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128BMF-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BMF-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMF-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMF-3.3/NOPB?
LM4128BMF-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMF-3.3/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 LM4128BMF-3.3/NOPB?
For technical support, including LM4128BMF-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMF-3.3/NOPB requirements.
6.How does Aetrix verify that LM4128BMF-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BMF-3.3/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 LM4128BMF-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BMF-3.3/NOPB?
All LM4128BMF-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMF-3.3/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 LM4128BMF-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM4128BMF-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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