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Texas Instruments LM4128CQ1MF1.8/NOPB
- Part No.:
- LM4128CQ1MF1.8/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM4128CQ1MF1.8/NOPB.pdf
- Description:
- IC VREF SERIES 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,586
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Product details
Overview
LM4128CQ1MF1.8/NOPB from Texas Instruments is a precision micropower series voltage reference in 5-pin SOT-23 package, delivering 1.8 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, making it suitable for battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4128CQ1MF1.8/NOPB datasheet, LM4128CQ1MF1.8/NOPB pinout, LM4128CQ1MF1.8/NOPB application, or LM4128CQ1MF1.8/NOPB equivalent, key selection considerations include its 1.8 V reference stability over −40°C to +125°C, dropout voltage of 400 mV at 10 mA, low 0.1 Hz–10 Hz noise (170 µVPP), and compatibility with ceramic capacitive loads up to 10 µF without external compensation.
Technical Context
The LM4128CQ1MF1.8/NOPB uses an internal band-gap-derived architecture optimized for low quiescent current and high PSRR. Its enable input accepts logic-level control (VIH ≥65% VIN, VIL ≤35% VIN) and internally pulls up with ~2 µA, allowing direct connection to VIN when always enabled.
It operates with input voltage as low as VREF + 400 mV (i.e., ≥2.2 V) up to 5.5 V, maintains stability with COUT = 0–10 µF, and includes indefinite short-circuit protection limiting output current to 75 mA. Thermal hysteresis is specified at 75 ppm over −40°C to +125°C cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V nominal, ±0.5% initial accuracy (C-grade) ensures reliable ADC/DAC biasing in 12-bit systems |
| Tempco | 100 ppm/°C max over −40°C to +125°C defines worst-case drift of ±18 mV across full range |
| Supply Current | 60 µA typical enables multi-year operation on coin-cell batteries in low-duty-cycle sensors |
| Shutdown Current | 3–7 µA with EN = 0 V extends battery life during system sleep modes |
| Dropout Voltage | 400 mV at 10 mA load allows use with 2.2 V minimum input, e.g., single LiFePO₄ cell |
| Noise (0.1–10 Hz) | 170 µVPP supports sub-16-bit precision in high-resolution measurement front-ends |
| Load Current | 20 mA max output drives multiple op-amp bias networks or SAR ADC references directly |
Pinout & Package
LM4128CQ1MF1.8/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package with 1.27 mm pitch, rated for −40°C to +125°C junction temperature and MSL Level-1 reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (N/C) | No-connect terminal | Must remain unconnected and floating; no internal bond or circuit connection |
| 2 (GND) | Analog ground reference | Primary return path for reference output and internal band-gap core; requires low-impedance PCB plane |
| 3 (EN) | Active-high enable input | Pulled up internally (~2 µA); drives high to enable reference output, low to enter 3–7 µA shutdown |
| 4 (VIN) | Input supply rail | Accepts 2.2 V to 5.5 V; must be bypassed with ≥0.1 µF ceramic capacitor (CIN) per layout guidelines |
| 5 (VREF) | Precision reference output | Delivers stable 1.8 V; capable of sourcing up to 20 mA while maintaining ±0.5% accuracy and <120 ppm/mA load regulation |
Key Features
| Feature | Design Value |
|---|---|
| No external stabilization capacitor required | Stable with 0–10 µF capacitive loads eliminates BOM cost and layout area for COUT |
| Low dropout voltage | 400 mV at 10 mA enables operation from single-cell energy sources including LiFePO₄ and NiMH |
| Enable-controlled shutdown | Reduces supply current to ≤7 µA, cutting power by >90% versus active mode for intermittent sensing |
| Stable with low-ESR ceramics | Compatible with X5R/X7R MLCCs simplifies decoupling design and avoids tantalum or electrolytic dependencies |
| AEC-Q100 Grade 1 qualified | Qualified for automotive underhood applications with guaranteed operation from −40°C to +125°C |
Applications
| Portable Data Loggers | Battery-Powered IoT Sensors |
|---|---|
Use Scenario: Continuous temperature/humidity logging in remote field deployments powered by AA alkaline cells. IC Role / Device Role / Timing Role: Provides stable 1.8 V reference for 16-bit sigma-delta ADC and microcontroller VREF input. Use Value: 60 µA supply current and 3 µA shutdown extend battery life beyond 5 years in sleep-wake cycles; 100 ppm/°C tempco ensures <±0.2% reading error across outdoor temperature swings. | Use Scenario: Wireless environmental node using BLE SoC and analog front-end for gas detection. IC Role / Device Role / Timing Role: Supplies precision bias to electrochemical sensor amplifier and ADC reference rail. Use Value: 170 µVPP low-frequency noise prevents baseline drift in ppb-level gas concentration measurements; enable pin synchronizes reference activation with sensor wake-up. |
| Automotive Cabin Control Units | Industrial PLC Analog Input Modules |
Use Scenario: HVAC control module measuring cabin temperature, humidity, and CO₂ inside vehicle cabin. IC Role / Device Role / Timing Role: Reference source for multiplexed 12-bit SAR ADC channels monitoring thermistors and NTC sensors. Use Value: AEC-Q100 Grade 1 qualification ensures reliability at 125°C junction temperature; 400 mV dropout allows direct use from 3.3 V LDO rail with margin for line transients. | Use Scenario: DIN-rail mounted programmable logic controller acquiring 4–20 mA loop signals and thermocouple inputs. IC Role / Device Role / Timing Role: Precision 1.8 V reference for isolated delta-sigma ADC and calibration DAC. Use Value: ±0.5% initial accuracy and 50 ppm long-term stability (1000 hrs) reduce factory calibration frequency; stable with 10 µF COUT improves rejection of 50/60 Hz mains-induced noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AUT18+T | 0.06% initial accuracy, 3 ppm/°C tempco, 65 µA IQ, SOT-23-5 | Higher precision and lower drift; requires external 1 µF COUT for stability | Select when <12-bit system accuracy or <±10 ppm total error budget is required; verify COUT placement per layout guide |
| ADR3418ARJZ-R7 | 0.1% initial accuracy, 30 ppm/°C tempco, 120 µA IQ, SOT-23-5 | Lower tempco but higher supply current; not AEC-Q100 qualified | Prefer for industrial test equipment where ultra-low drift outweighs automotive qualification needs |
Compared with MAX6126AUT18+T and ADR3418ARJZ-R7, LM4128CQ1MF1.8/NOPB offers best-in-class micropower operation (60 µA) and automotive qualification at C-grade accuracy, trading off some tempco performance for robustness in cost-sensitive embedded systems.
Availability
LM4128CQ1MF1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin electronics, and industrial analog input modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4128CQ1MF1.8/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 automotive-grade components.
The LM4128 product line delivers micropower, high-accuracy series voltage references for space-constrained, battery-operated, and automotive applications where low dropout, enable control, and wide temperature operation are critical.
FAQ
What is the maximum input voltage rating for LM4128CQ1MF1.8/NOPB?
The absolute maximum input voltage for LM4128CQ1MF1.8/NOPB is 6 V, but the recommended operating maximum is 5.5 V per the Electrical Characteristics table. Exceeding 5.5 V risks violating the Absolute Maximum Ratings and may cause permanent damage or parametric shift. The device is designed for operation from VREF + 400 mV (≥2.2 V) up to 5.5 V, with optimal stability and specification compliance within that range. Always observe derating curves for power dissipation at elevated ambient temperatures.
Does LM4128CQ1MF1.8/NOPB require an input capacitor, and what value is recommended?
Yes, LM4128CQ1MF1.8/NOPB requires an input capacitor (CIN) for stable operation. The datasheet specifies CIN ≥ COUT, and when no output capacitor is used, CIN must be at least 0.1 µF. For best noise performance and startup behavior, TI recommends 4.7 µF to 22 µF ceramic (X5R/X7R) placed close to the VIN and GND pins. This capacitor suppresses supply ripple and reduces overshoot during turn-on - critical for precision measurement systems where reference settling affects ADC accuracy.
What does the 'CQ' suffix indicate in LM4128CQ1MF1.8/NOPB?
The 'CQ' in LM4128CQ1MF1.8/NOPB denotes two attributes: 'C' indicates the C-grade accuracy (±0.5% initial output voltage tolerance), and 'Q' signifies AEC-Q100 Grade 1 qualification for automotive applications (-40°C to +125°C). The '1MF' portion specifies the SOT-23-5 (DBV) package with tape-and-reel packaging (1000 units per reel), and '/NOPB' confirms lead-free (RoHS-compliant) finish. This makes LM4128CQ1MF1.8/NOPB suitable for under-hood automotive modules and industrial controls requiring extended temperature reliability.
Can LM4128CQ1MF1.8/NOPB drive a 10 µF output capacitor, and how does it affect performance?
Yes, LM4128CQ1MF1.8/NOPB is explicitly characterized and guaranteed stable with output capacitors up to 10 µF, unlike many references requiring zero or small COUT. Adding COUT improves load transient response - especially during step-load changes from light to heavy - but increases turn-on time (e.g., ~78.8 µs to 90% with 10 µF vs. ~33.2 µs with 1 µF). It also reduces output noise and enhances PSRR at higher frequencies. However, arbitrarily large COUT values degrade dynamic performance and are unnecessary; 1–10 µF is the validated range.
Is LM4128CQ1MF1.8/NOPB pin-compatible with other LM4128 variants like LM4128AMF-1.8/NOPB?
Yes, LM4128CQ1MF1.8/NOPB is pin-compatible with all LM4128xMF-1.8/NOPB variants (A/B/C/D grades, Q and non-Q versions) because they share identical 5-pin SOT-23 (DBV) package, pinout, and footprint. Pin 1 is N/C, Pin 2 is GND, Pin 3 is EN, Pin 4 is VIN, and Pin 5 is VREF across the entire family. Differences lie only in electrical specifications (accuracy, tempco, IQ) and qualification status - not mechanical or connectivity design - enabling drop-in replacement for grade or qualification upgrades without PCB revision.
LM4128CQ1MF1.8/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):
- 1.8V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- 170µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 2.2V ~ 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
LM4128CQ1MF1.8/NOPB FAQ
1.How can I place an order for LM4128CQ1MF1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4128CQ1MF1.8/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 LM4128CQ1MF1.8/NOPB reliable?
The price and inventory of LM4128CQ1MF1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4128CQ1MF1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LM4128CQ1MF1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4128CQ1MF1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4128CQ1MF1.8/NOPB?
LM4128CQ1MF1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4128CQ1MF1.8/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 LM4128CQ1MF1.8/NOPB?
For technical support, including LM4128CQ1MF1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4128CQ1MF1.8/NOPB requirements.
6.How does Aetrix verify that LM4128CQ1MF1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4128CQ1MF1.8/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 LM4128CQ1MF1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LM4128CQ1MF1.8/NOPB?
All LM4128CQ1MF1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4128CQ1MF1.8/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 LM4128CQ1MF1.8/NOPB part is unused and in its original packaging.
Return procedure for LM4128CQ1MF1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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