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Texas Instruments LM4128BMF-2.5/NOPB
- Part No.:
- LM4128BMF-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128BMF-2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,089
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Product details
Overview
LM4128BMF-2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 2.5 V output with ±0.2% initial accuracy (Grade B), 75 ppm/°C max 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-2.5/NOPB datasheet, LM4128BMF-2.5/NOPB pinout, LM4128BMF-2.5/NOPB application, or LM4128BMF-2.5/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), line regulation (50 ppm/V), load regulation (25–120 ppm/mA), and stability with capacitive loads up to 10 µF without external compensation.
Technical Context
The LM4128BMF-2.5/NOPB uses an internal band-gap-derived reference core with active error correction, enabling high initial accuracy and low thermal drift across its full operating temperature range. Its enable-controlled architecture allows seamless integration into power-gated systems while maintaining fast turn-on time (typically 33.2 µs with 1 µF load).
Designed as a series reference, it eliminates idle current waste typical of shunt types and achieves low dropout (175–400 mV) by optimizing pass-element drive and feedback loop stability. The device remains stable with ceramic output capacitors up to 10 µF and requires only a minimum 0.1 µF input capacitor (CIN ≥ COUT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.2% initial accuracy (Grade B) - ensures ≤±5 mV absolute error at 25°C for 12-bit ADC biasing |
| Temperature Coefficient | 75 ppm/°C max - limits drift to ≤18.75 ppm over 0–25°C ambient, critical for precision sensor signal chains |
| Supply Current | 60 µA typical - enables >1-year battery life in 10 µA-sleep IoT nodes when paired with enable control |
| Shutdown Current | 3–7 µA with EN = 0 V - reduces system standby power by >90% vs active mode |
| Dropout Voltage | 175–400 mV at 10 mA - supports operation from 2.675 V input, compatible with single-cell LiFePO₄ or dual-cell alkaline |
| Output Noise (0.1–10 Hz) | 275 µVPP - meets <1 LSB noise requirement for 16-bit 2.5 V full-scale SAR ADCs |
| Load Regulation | 25–120 ppm/mA - maintains ≤0.3 mV shift from 0 to 20 mA load, suitable for driving DAC buffers and op-amp references |
Pinout & Package
LM4128BMF-2.5/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package with 0.95 mm pitch, optimized for space-constrained PCB layouts and reflow-compatible assembly. Pin 1 is N/C (no connect); pin assignments are verified per TI SNVS475E datasheet Figure 2 and PIN DESCRIPTIONS table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must be left floating; no internal connection - avoids unintended parasitic coupling or ESD path |
| 2 (GND) | Analog ground reference | Low-impedance return for reference core and enable logic; requires dedicated ground plane tie |
| 3 (EN) | Active-high enable input | Accepts 0 V (shutdown) or ≥65% of VIN (active); internal 2 µA pull-up allows direct VIN tie if unused |
| 4 (VIN) | Unregulated input supply | Operates from VREF + 400 mV to 5.5 V; must be bypassed with ≥0.1 µF ceramic capacitor |
| 5 (VREF) | Precision 2.5 V output | Delivers stable reference to downstream converters, ADCs, or comparators; stable with 0–10 µF capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Enable-controlled shutdown | Reduces quiescent current to ≤7 µA, enabling ultra-low-power duty-cycled sensing in portable equipment |
| No external stabilization capacitor required | Eliminates BOM cost and layout area for compensation cap while ensuring stability with 10 µF output capacitance |
| Stable with low-ESR ceramic capacitors | Supports X5R/X7R MLCCs without oscillation risk - simplifies filtering and improves transient response |
| Indefinite short-circuit protection | Limits output current to 75 mA during fault, preventing thermal runaway and enabling robust field deployment |
| −40°C to +125°C junction operation | Validated performance across automotive under-hood and industrial control environments without derating |
Applications
| Instrumentation & Process Control | Portable Battery-Powered Equipment |
|---|---|
Use Scenario: High-resolution analog front-end in handheld multimeters and loop calibrators requiring stable excitation for RTD/thermocouple measurement. IC Role / Device Role / Timing Role: Precision 2.5 V reference for 24-bit delta-sigma ADC and programmable gain amplifier biasing. Use Value: ±0.2% initial accuracy and 75 ppm/°C tempco ensure <0.02% total error over industrial temperature range without calibration. |
Use Scenario: Reference source in wearable health monitors with optical PPG sensors and low-power MCU. IC Role / Device Role / Timing Role: Low-quiescent-current voltage reference for analog sensor signal conditioning and ADC reference rail. Use Value: 60 µA active current and 3 µA shutdown extend coin-cell lifetime beyond 2 years in intermittent-sampling mode. |
| Data Acquisition Systems | Automotive & Industrial Electronics |
Use Scenario: Modular DAQ module for factory floor monitoring, interfacing multiple transducers to a central FPGA-based controller. IC Role / Device Role / Timing Role: Local 2.5 V reference per channel to eliminate shared-rail crosstalk and improve CMRR. Use Value: Load regulation of 25 ppm/mA ensures consistent 16-bit linearity across varying sensor output impedances. |
Use Scenario: Reference for engine control unit (ECU) analog inputs measuring throttle position, coolant temperature, and knock sensor signals. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified voltage reference providing stable bias under wide-input-voltage transients. Use Value: Operates from 2.675 V to 5.5 V with 400 mV dropout, surviving cold-crank (6.0 V) and load-dump (42 V) conditions via upstream LDO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V, ±0.2% initial accuracy, 100 ppm/°C max tempco, 50 µA IQ, SOT-23-5 - higher tempco, lower IQ, no enable pin | Lacks enable control; unsuitable for power-gated architectures requiring shutdown mode | Select when lowest quiescent current is prioritized over enable functionality and thermal stability |
| ADR3425ARTZ-R7 | 2.5 V, ±0.1% initial accuracy, 50 ppm/°C max tempco, 120 µA IQ, SOT-23-5 - tighter accuracy/tempco, higher IQ, no enable | Higher supply current and no shutdown capability limit use in battery-critical designs | Choose when long-term stability (<15 ppm/1000 hrs) and ultra-low drift outweigh power budget constraints |
Compared with REF3025AIDBZR and ADR3425ARTZ-R7, LM4128BMF-2.5/NOPB uniquely combines enable control, 75 ppm/°C tempco, and 60 µA supply current in a single SOT-23-5 package - making it optimal for space- and power-constrained systems needing both precision and dynamic power management.
Availability
LM4128BMF-2.5/NOPB is available at Aetrix Electronics and suitable for instrumentation & process control, portable battery-powered equipment, and data acquisition systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4128BMF-2.5/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 focused on analog and embedded processing technologies, with decades of expertise in precision analog IC design and manufacturing.
The LM4128 product line delivers micropower, high-accuracy series voltage references for space- and energy-constrained applications including portable instrumentation, automotive sensors, and industrial data acquisition.
FAQ
What is the maximum load current supported by LM4128BMF-2.5/NOPB?
The LM4128BMF-2.5/NOPB supports up to 20 mA output current while maintaining specified accuracy and regulation. At 10 mA load, dropout voltage is guaranteed ≤400 mV; output voltage deviation remains within ±120 ppm/mA load regulation limits across the full −40°C to +125°C temperature range. Exceeding 20 mA may trigger short-circuit limiting at 75 mA.
Does LM4128BMF-2.5/NOPB require an external output capacitor?
No - LM4128BMF-2.5/NOPB is stable without an external output capacitor and remains stable with capacitive loads up to 10 µF. An optional COUT improves load transient response but extends turn-on time; CIN ≥ COUT is required, with minimum CIN = 0.1 µF when COUT = 0. LM4128BMF-2.5/NOPB's internal compensation eliminates need for external stabilization networks.
What is the enable pin logic threshold for LM4128BMF-2.5/NOPB?
The LM4128BMF-2.5/NOPB enable pin has a guaranteed VIH ≥65% of VIN and VIL ≤35% of VIN. With VIN = 3.3 V, EN must exceed 2.15 V to activate; below 1.16 V, the device enters 3–7 µA shutdown mode. Internal 2 µA pull-up allows direct connection to VIN if enable control is unused - no external resistor needed.
How does LM4128BMF-2.5/NOPB perform under low-temperature conditions?
LM4128BMF-2.5/NOPB is fully specified from −40°C to +125°C. At −40°C, dropout voltage remains ≤400 mV (10 mA), startup time extends to ≤10 ms under brown-out, and output noise increases marginally to ≤290 µVPP (0.1–10 Hz). Thermal hysteresis is limited to 75 ppm, ensuring repeatable 2.5 V output after thermal cycling.
Is LM4128BMF-2.5/NOPB AEC-Q100 qualified?
No - LM4128BMF-2.5/NOPB is not AEC-Q100 qualified. For automotive-grade versions, TI offers the LM4128Q series (e.g., LM4128BQMF-2.5/NOPB), which are AEC-Q100 Grade 1 qualified and manufactured on an automotive flow. LM4128BMF-2.5/NOPB is intended for industrial and commercial applications with extended temperature requirements but without automotive qualification mandates.
LM4128BMF-2.5/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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 275µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.9V ~ 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-2.5/NOPB FAQ
1.How can I place an order for LM4128BMF-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128BMF-2.5/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-2.5/NOPB reliable?
The price and inventory of LM4128BMF-2.5/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-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128BMF-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128BMF-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128BMF-2.5/NOPB?
LM4128BMF-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128BMF-2.5/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-2.5/NOPB?
For technical support, including LM4128BMF-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128BMF-2.5/NOPB requirements.
6.How does Aetrix verify that LM4128BMF-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128BMF-2.5/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-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128BMF-2.5/NOPB?
All LM4128BMF-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128BMF-2.5/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-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128BMF-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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