My Inquiry
My Account
Texas Instruments LM4128CQ1MFX2.5/NOPB
- Part No.:
- LM4128CQ1MFX2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CQ1MFX2.5/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,194
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4128CQ1MFX2.5/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 (DBV) package, delivering 2.5 V output with ±0.5% initial accuracy, 100 ppm/°C temperature coefficient, and 60 µA supply current. It features an enable pin for 3 µA shutdown mode and supports up to 20 mA load current-ideal for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128CQ1MFX2.5/NOPB datasheet, LM4128CQ1MFX2.5/NOPB pinout, LM4128CQ1MFX2.5/NOPB application, or LM4128CQ1MFX2.5/NOPB equivalent, key selection criteria include dropout voltage (≤400 mV at 10 mA), line regulation (50 ppm/V), load regulation (25–120 ppm/mA), 0.1–10 Hz noise (275 µVPP), and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The LM4128CQ1MFX2.5/NOPB is a band-gap-based series voltage reference optimized for low quiescent current and capacitive-load stability without external compensation. Its enable input controls internal biasing, allowing transition between active (60 µA) and shutdown (3–7 µA) states while maintaining output regulation over −40°C to +125°C junction temperature.
It operates with VIN ≥ VREF + 400 mV (i.e., ≥2.9 V at 10 mA load) and remains stable driving up to 10 µF capacitive loads. The no-connect (N/C) pin simplifies layout in space-constrained designs, and its low thermal hysteresis (75 ppm) ensures repeatable output after temperature cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V nominal, ±0.5% initial accuracy (C-grade) - enables 10-bit ADC reference with ≤0.5 LSB error at room temperature |
| Temperature Coefficient | 100 ppm/°C max - limits drift to ±0.3125 mV over −40°C to +125°C span |
| Supply Current | 60 µA typical - supports >1-year battery life in 10 µA average-power IoT sensor nodes |
| Shutdown Current | 3–7 µA - reduces system standby power by >90% vs active mode |
| Dropout Voltage | 175–400 mV at 10 mA - allows operation from single-cell Li-ion (3.0 V min) or two alkaline cells (3.0 V fresh) |
| Output Noise (0.1–10 Hz) | 275 µVPP - suitable for 16-bit SAR ADCs requiring <1 LSB noise floor at 2.5 V full scale |
| Load Regulation | 25–120 ppm/mA - maintains <±0.3 mV error across 0–20 mA load range |
Pinout & Package
LM4128CQ1MFX2.5/NOPB uses a 5-pin SOT-23 (DBV) package (2.9 mm × 1.6 mm × 1.15 mm), RoHS-compliant, with SN lead finish and MSL Level-1 rating. Pin 1 is N/C (no connect); pins are arranged top-view as: Pin 1 (N/C), Pin 2 (GND), Pin 3 (EN), Pin 4 (VIN), Pin 5 (VREF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (N/C) | No-connect terminal | Must be left floating; no internal connection - eliminates routing complexity and avoids unintended parasitic coupling |
| Pin 2 (GND) | Analog ground reference | Primary return path for reference current and load current; requires low-impedance PCB plane tie to minimize noise injection |
| Pin 3 (EN) | Enable control input | Active-high logic: VIH ≥65% VIN, VIL ≤35% VIN - permits direct MCU GPIO control without level-shifting |
| Pin 4 (VIN) | Input supply rail | Accepts 2.9 V to 5.5 V; must exceed VREF by ≥400 mV under load - defines minimum battery voltage for reliable operation |
| Pin 5 (VREF) | Precision output terminal | Delivers regulated 2.5 V; stable with 0–10 µF capacitive loads - supports direct connection to ADC reference inputs or op-amp feedback networks |
Key Features
| Feature | Design Value |
|---|---|
| Enable pin with 3 µA shutdown | Reduces system standby power by >95%, enabling ultra-low-power wake-on-event architectures in portable medical devices |
| Stability without external COUT | Eliminates BOM cost and board area for output capacitor - simplifies design for space-critical wearables and implantables |
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation in automotive ECUs, including body control modules and ADAS sensor interfaces |
| Low 0.1–10 Hz noise (275 µVPP) | Meets noise budget for high-resolution 16-bit delta-sigma ADCs used in precision current sensing and strain gauge bridges |
| Indefinite short-circuit protection | Limits fault current to 75 mA - prevents thermal runaway during PCB assembly errors or field-level wiring faults |
Applications
| Instrumentation & Process Control | Portable Battery-Powered Equipment |
|---|---|
Use Scenario: High-accuracy analog front-end in handheld multimeters and loop calibrators. IC Role / Device Role / Timing Role: Primary 2.5 V reference for 24-bit sigma-delta ADC and DAC signal chains. Use Value: ±0.5% initial accuracy and 100 ppm/°C tempco ensure calibration validity over extended field deployment without recalibration. |
Use Scenario: Power management in portable gas detectors with electrochemical sensors. IC Role / Device Role / Timing Role: Stable excitation voltage source for sensor biasing and ADC reference in ultra-low-power sleep/wake cycles. Use Value: 3 µA shutdown current extends coin-cell battery life beyond 5 years in maintenance-free deployments. |
| Automotive Electronics | Medical Equipment |
Use Scenario: Reference for engine coolant temperature and pressure sensor signal conditioning in powertrain ECUs. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified 2.5 V reference supporting ASIL-B functional safety requirements. Use Value: Thermal hysteresis of 75 ppm ensures repeatable readings after thermal cycling in under-hood environments. |
Use Scenario: Precision voltage reference in portable ECG monitors with 24-bit ADCs. IC Role / Device Role / Timing Role: Low-noise 2.5 V reference for analog signal chain, directly tied to ADC REF+ input. Use Value: 275 µVPP (0.1–10 Hz) noise contributes <0.05% of full-scale error - critical for detecting microvolt-level cardiac signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3025AIDBZR | 2.5 V, ±0.2% initial accuracy, 50 ppm/°C, 50 µA IQ, SOT-23-5 - tighter accuracy/tempco but no enable pin | Preferred where highest stability is required and shutdown control is handled externally (e.g., via LDO EN) | Select when long-term drift (<20 ppm/1000 hrs) and lower tempco outweigh need for integrated enable functionality |
| MAX6025AEUR+T | 2.5 V, ±0.1% initial accuracy, 30 ppm/°C, 35 µA IQ, SOT-23-5 - superior specs but not AEC-Q100 qualified | Suitable for industrial test equipment but not automotive-grade designs requiring qualification evidence | Choose for lab-grade instrumentation where AEC-Q100 is unnecessary and sub-50 ppm/°C performance is mandatory |
Compared with REF3025AIDBZR and MAX6025AEUR+T, the LM4128CQ1MFX2.5/NOPB uniquely combines AEC-Q100 Grade 1 qualification, integrated enable control, and robust capacitive-load stability - making it the only option among the three validated for automotive body electronics with dynamic power gating.
Availability
LM4128CQ1MFX2.5/NOPB is available at Aetrix Electronics and suitable for instrumentation & process control, portable battery-powered equipment, and automotive electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128CQ1MFX2.5/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 ICs and automotive-grade reliability validation.
The LM4128 product line delivers micropower, high-accuracy series voltage references for space-constrained, battery-sensitive applications - designed specifically for instrumentation, automotive sensors, and portable medical devices demanding AEC-Q100 compliance.
FAQ
What is the operating temperature range for the LM4128CQ1MFX2.5/NOPB?
The LM4128CQ1MFX2.5/NOPB is rated for −40°C to +125°C junction temperature and is AEC-Q100 Grade 1 qualified. This range is validated per TI's automotive flow and supports operation in under-hood automotive modules, industrial PLCs, and outdoor environmental sensors without derating.
Does the LM4128CQ1MFX2.5/NOPB require an input capacitor?
Yes - the LM4128CQ1MFX2.5/NOPB requires a minimum 0.1 µF ceramic input capacitor (CIN). Per TI's application guidance, CIN ≥ COUT when an output capacitor is used; omitting CIN risks instability and degraded noise performance in the LM4128CQ1MFX2.5/NOPB.
What is the maximum load current supported by the LM4128CQ1MFX2.5/NOPB?
The LM4128CQ1MFX2.5/NOPB supports up to 20 mA output current while maintaining regulation within specified accuracy limits. At 20 mA load, dropout voltage remains ≤400 mV, and load regulation is bounded to 120 ppm/mA - verified across −40°C to +125°C for the LM4128CQ1MFX2.5/NOPB.
How does the enable pin function on the LM4128CQ1MFX2.5/NOPB?
The enable pin (Pin 3) of the LM4128CQ1MFX2.5/NOPB is active-high: VIH ≥65% VIN enables regulation (60 µA IQ), while VIL ≤35% VIN forces shutdown (3–7 µA). It has an internal ~2 µA pull-up, so tying EN to VIN provides default-on operation - a key feature distinguishing the LM4128CQ1MFX2.5/NOPB from non-enable alternatives.
Is the LM4128CQ1MFX2.5/NOPB stable with large output capacitance?
Yes - the LM4128CQ1MFX2.5/NOPB is explicitly characterized for stability with capacitive loads up to 10 µF, including low-ESR ceramic types. This eliminates need for series resistance or isolation components, simplifying layout for high-transient-response applications like multiplexed ADC references - a core specification confirmed for the LM4128CQ1MFX2.5/NOPB.
LM4128CQ1MFX2.5/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:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM4128CQ1MFX2.5/NOPB FAQ
1.How can I place an order for LM4128CQ1MFX2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CQ1MFX2.5/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 LM4128CQ1MFX2.5/NOPB reliable?
The price and inventory of LM4128CQ1MFX2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CQ1MFX2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CQ1MFX2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CQ1MFX2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CQ1MFX2.5/NOPB?
LM4128CQ1MFX2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CQ1MFX2.5/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 LM4128CQ1MFX2.5/NOPB?
For technical support, including LM4128CQ1MFX2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CQ1MFX2.5/NOPB requirements.
6.How does Aetrix verify that LM4128CQ1MFX2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CQ1MFX2.5/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 LM4128CQ1MFX2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CQ1MFX2.5/NOPB?
All LM4128CQ1MFX2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CQ1MFX2.5/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 LM4128CQ1MFX2.5/NOPB part is unused and in its original packaging.
Return procedure for LM4128CQ1MFX2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4128CQ1MFX2.5/NOPB Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
