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onsemi MC78LC40NTRG
- Part No.:
- MC78LC40NTRG
- Manufacturer:
- onsemi
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MC78LC40NTRG.pdf
- Description:
- IC REG LINEAR 4V 80MA 5TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,544
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Product details
Overview
MC78LC40NTRG from onsemi is a fixed-output, micropower low-dropout linear voltage regulator delivering 4.0 V at up to 80 mA with 30 mV dropout (IOUT = 1.0 mA) and ultra-low 1.1 µA typical quiescent current. It employs a PMOS pass transistor, operates from 12 V max input, and targets battery-powered portable electronics requiring stable low-power biasing.
For engineers reviewing the MC78LC40NTRG datasheet, pinout, applications, or equivalent options, key selection criteria include its 4.0 V output accuracy (±2.5%), −40°C to +85°C industrial temperature range, SOT-23-5 package compatibility, and ceramic capacitor stability with only 0.1 µF minimum output capacitance.
Technical Context
The MC78LC40NTRG integrates a precision voltage reference, error amplifier, and PMOS power transistor in a single-stage LDO architecture. Its regulation relies on internal resistor feedback for fixed 4.0 V output, with no external adjustment capability.
It achieves micropower operation via optimized bias circuitry, maintaining 1.1 µA quiescent current across input voltages from 5.0 V to 12 V and ambient temperatures from −40°C to +85°C. Dropout behavior is characterized at 3% output deviation, yielding 30 mV at 1.0 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.0 V ±2.5% (ensures stable logic supply for 3.3 V/4.0 V I/O domains) |
| Dropout Voltage | 30 mV at 1.0 mA (enables regulation down to Vin = 4.03 V, critical for single-cell Li-ion or alkaline systems) |
| Quiescent Current | 1.1 µA typical (minimizes standby drain in always-on sensor nodes or RTC backup rails) |
| Max Input Voltage | 12 V (supports wide-input battery stacks or unregulated wall adapters) |
| Operating Temp | −40°C to +85°C (meets industrial-grade reliability for handheld test equipment) |
| Output Capacitor | 0.1 µF min ceramic (enables compact, low-BOM-count designs without ESR constraints) |
| Line Regulation | 0.05%/V typical (maintains <±1.2 mV output shift per volt input change) |
| Noise Voltage | 89 µVRMS (1–100 kHz) (suitable for noise-sensitive analog front-ends) |
Pinout & Package
MC78LC40NTRG is housed in a Pb-free Thin SOT-23-5 (Case 483) surface-mount package measuring 3.0 mm × 1.5 mm × 0.95 mm, with thermal pad connected to Pin 2 (Vin).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Power supply ground reference; must be low-impedance connection to minimize noise coupling |
| 2 | Vin | Positive input supply; internally tied to thermal pad-requires adequate copper pour for thermal management |
| 3 | Vout | Regulated 4.0 V output; connects directly to load and 0.1 µF ceramic decoupling capacitor |
| 4 | N/C | No internal connection; electrically floating-may be left unconnected or grounded for mechanical stability |
| 5 | N/C | No internal connection; electrically floating-no routing or termination required |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.1 µA typical enables >1-year battery life in 10 µA average-load IoT sensors |
| Ceramic capacitor compatible | Stable with 0.1 µF ceramic output cap-eliminates need for costly tantalum or high-ESR capacitors |
| High accuracy output | ±2.5% over temperature ensures reliable interface with 4.0 V ADC references or microcontroller VDDIO |
| Low dropout at light load | 30 mV dropout at 1 mA allows operation from depleting 4.2 V Li-ion cells down to 4.03 V |
| Industrial temperature range | −40°C to +85°C operation supports deployment in outdoor instrumentation and automotive cabin modules |
| Pb-free SOT-23-5 package | RoHS-compliant 5-pin micro-package enables high-density PCB layouts in space-constrained wearables |
Applications
| Battery-Powered Instruments | Hand-Held Test Equipment |
|---|---|
Use Scenario: Portable multimeter powered by two AA alkaline cells (1.8–3.2 V), requiring clean 4.0 V rail for LCD bias and ADC reference. IC Role / Device Role / Timing Role: Primary 4.0 V LDO regulator providing stable, low-noise supply independent of battery voltage sag. Use Value: 1.1 µA quiescent current extends shelf life; 30 mV dropout enables full utilization of battery capacity down to 4.03 V input. |
Use Scenario: Handheld oscilloscope probe interface module operating from USB 5 V or internal LiPo, needing precise 4.0 V for analog front-end amplifiers. IC Role / Device Role / Timing Role: Low-noise voltage source for op-amp biasing and reference generation in signal conditioning path. Use Value: 89 µVRMS noise and ±2.5% accuracy ensure <0.1% measurement error in DC-coupled voltage readings. |
| Camcorder Power Management | Medical Sensor Node |
Use Scenario: Image sensor and ISP subsystem in compact camcorder requiring regulated 4.0 V from variable 3.6–4.2 V Li-ion cell. IC Role / Device Role / Timing Role: Dedicated LDO for image processing core, isolated from noisy digital switching supplies. Use Value: 0.05%/V line regulation prevents video gain drift during battery discharge; SOT-23-5 footprint saves board area. |
Use Scenario: Wearable ECG patch using coin cell (3 V) boosted to 4.0 V rail for analog front-end and BLE radio. IC Role / Device Role / Timing Role: Final-stage regulator delivering ultra-low-noise 4.0 V to instrumentation amplifier and ADC. Use Value: 1.1 µA IQ enables multi-week operation on CR2032; −40°C to +85°C rating covers clinical and home-use environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-4002E/TT | 4.0 V output, 1.6 µA IQ, 175 mV dropout at 250 mA, SOT-23-3 package | Higher dropout limits use below 4.2 V input; 3-pin package lacks N/C pins for layout flexibility | Select when higher output current (250 mA) is needed and 175 mV dropout is acceptable |
| TPS78040DRVR | 4.0 V output, 500 nA IQ, 150 mV dropout at 150 mA, WSON-6 package | Sub-µA IQ ideal for decade-long battery life; larger WSON-6 footprint vs. SOT-23-5 | Select when nanoscale quiescent current is mandatory and PCB area permits WSON-6 |
Compared with MC78LC40NTRG, MCP1700T-4002E/TT offers higher current but significantly higher dropout, while TPS78040DRVR delivers far lower IQ but requires more board area and has different thermal characteristics-MC78LC40NTRG balances ultra-low IQ, minimal dropout, and compact SOT-23-5 integration for mid-life portable devices.
Availability
MC78LC40NTRG is available at Aetrix Electronics and suitable for battery-powered instruments, hand-held test equipment, and camcorder power management requiring stable component supply with guaranteed long-term sourcing.
Supply support for MC78LC40NTRG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The MC78LC00 series was designed specifically for micropower, low-dropout regulation in portable battery-operated devices-emphasizing ultra-low IQ, ceramic capacitor compatibility, and industrial temperature resilience.
FAQ
What is the maximum input voltage rating for MC78LC40NTRG?
The MC78LC40NTRG has an absolute maximum input voltage of 12 V, as specified in the Maximum Ratings table. Operation above this level risks permanent damage. For reliable 4.0 V regulation, input should remain ≥4.03 V (4.0 V + 30 mV dropout) across all load and temperature conditions. The MC78LC40NTRG is rated for continuous operation up to 12 V, making it suitable for systems with transient overvoltage or multi-cell battery inputs.
Does MC78LC40NTRG require an external output capacitor, and what type is recommended?
Yes, MC78LC40NTRG requires a minimum 0.1 µF output capacitor for stability, and ceramic capacitors are explicitly recommended in the datasheet. Unlike many LDOs, it imposes no ESR requirements-capacitors with ESR from a few milliohms up to 3.0 Ω are acceptable. This simplifies BOM selection and enables use of low-cost, small-footprint X7R or C0G ceramics, directly supporting compact, cost-effective designs.
What is the dropout voltage of MC78LC40NTRG at full rated load?
The MC78LC40NTRG dropout voltage is not characterized at full 80 mA load in the provided datasheet; the published value of 30 mV applies at 1.0 mA. At 80 mA, dropout increases-Figure 6 shows ~60 mV for the 3.0 V variant at 80 mA, and MC78LC40NTRG follows similar trend. For 4.0 V output, expect ~65–70 mV at 80 mA, meaning Vin must be ≥4.07 V to maintain regulation under full load.
Can MC78LC40NTRG be used in automotive applications?
The MC78LC40NTRG is rated for −40°C to +85°C ambient operation, meeting standard industrial temperature requirements but not the extended −40°C to +125°C AEC-Q100 Grade 3 specification for under-hood automotive use. It may be deployed in automotive cabin modules (e.g., infotainment accessories or dashcams) where ambient temperature remains within its spec, but is not qualified for engine bay or safety-critical systems.
How does the quiescent current of MC78LC40NTRG vary with input voltage and temperature?
Per Figures 10 and 12, MC78LC40NTRG quiescent current remains remarkably stable: 1.1 µA typical across Vin = 4.0–12 V at 25°C, rising only to ~1.2 µA at 85°C and dropping to ~0.9 µA at −40°C. This flat IQ profile-unaffected by input voltage swing-is a key design advantage for battery runtime predictability in variable-supply portable systems using MC78LC40NTRG.
MC78LC40NTRG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 4V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.038V @ 1mA
- Current - Output:
- 80mA
- Current - Quiescent (Iq):
- 3.6 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 5-TSOP
MC78LC40NTRG FAQ
1.How can I place an order for MC78LC40NTRG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78LC40NTRG 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 MC78LC40NTRG reliable?
The price and inventory of MC78LC40NTRG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78LC40NTRG is usually 5 days.
3.What payment methods are accepted for MC78LC40NTRG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78LC40NTRG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78LC40NTRG?
MC78LC40NTRG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78LC40NTRG 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 MC78LC40NTRG?
For technical support, including MC78LC40NTRG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78LC40NTRG requirements.
6.How does Aetrix verify that MC78LC40NTRG is sourced from the original manufacturer or authorized distributors?
All MC78LC40NTRG 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 MC78LC40NTRG meets industry standards.
7.What is the process for return or replacement of MC78LC40NTRG?
All MC78LC40NTRG units undergo pre-shipment inspection (PSI). If there is an issue with MC78LC40NTRG, 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 MC78LC40NTRG part is unused and in its original packaging.
Return procedure for MC78LC40NTRG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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