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onsemi MC78FC40HT1
- Part No.:
- MC78FC40HT1
- Manufacturer:
- onsemi
- Package:
- TO-243AA
- Datasheet:
-
MC78FC40HT1.pdf
- Description:
- IC REG LINEAR FIXED LDO REG
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MC78FC40HT1 from onsemi is a micropower low-dropout linear voltage regulator delivering 4.0 V ±2.5% output with ultra-low quiescent current (1.2 µA typical at 6.0 V input), 100 mV dropout at 10 mA, and up to 100 mA output current in SOT−89 package. It serves as a stable power source for battery-powered video instruments and handheld communication equipment.
For engineers reviewing the MC78FC40HT1 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 4.0 V accuracy over −30°C to +80°C ambient, 0.1% line regulation, and compatibility with 0.1 µF ceramic output capacitance for stability.
Technical Context
The MC78FC40HT1 integrates a precision voltage reference, error amplifier, driver transistor, and internal feedback resistors to regulate output at 4.0 V. Its architecture supports operation from 2.0 V to 10 V input while maintaining regulation down to 100 mV dropout at light load.
It features built-in current limiting and thermal shutdown protection. The device requires only 0.1 µF output capacitance for stability and exhibits ±100 ppm/°C output voltage temperature coefficient-critical for precision battery-powered systems where supply headroom and quiescent power are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.0 V ±2.5% - tightly regulated nominal rail for logic or analog circuitry requiring stable mid-range bias. |
| Dropout Voltage | 100 mV at 10 mA - enables operation with minimal input–output differential, extending battery life in single-cell Li-ion or dual-cell alkaline systems. |
| Quiescent Current | 1.2 µA typical at 6.0 V input - reduces standby power loss, critical for always-on sensor nodes and remote controls. |
| Line Regulation | 0.1% - ensures output remains stable despite input voltage fluctuations from battery discharge or upstream switching noise. |
| Load Regulation | 40–80 mV across 1–10 mA load - maintains voltage integrity during dynamic current draw in portable audio or display backlight circuits. |
| Operating Temp Range | −30°C to +80°C ambient - validated for industrial-grade handhelds and outdoor-deployed instrumentation without derating. |
| Output Current | Up to 100 mA - sufficient to power microcontrollers, RF transceivers, or small LCD drivers without external boost stages. |
Pinout & Package
SOT−89 (Case 1213−02) surface-mount package with exposed tab thermally and electrically connected to Pin 2 (GND). Compact 4.5 × 2.5 × 1.5 mm footprint optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Tab) | Ground / Thermal Pad | Electrically tied to Pin 2; provides primary thermal path to PCB copper and low-impedance return for regulator ground current. |
| 2 | Ground | Reference node for error amplifier and internal bias; must be routed with low-inductance connection to input/output capacitors. |
| 3 | Input | Unregulated DC input (2.0–10 V); requires local 0.1 µF bypass capacitor placed adjacent to this pin. |
| 1 (Lead) | Output | Regulated 4.0 V output; connects directly to load and 0.1 µF ceramic capacitor to GND for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.2 µA typical enables >1-year battery life in 10 µA average-load IoT sensors using two AA cells. |
| Low dropout voltage | 100 mV at 10 mA allows full 4.0 V output from a discharged 4.1 V Li-ion cell, maximizing usable battery capacity. |
| Internal current limit | Protects device and source during short-circuit or overload; eliminates need for external foldback circuitry. |
| Stable with 0.1 µF output cap | Reduces BOM count and board area vs. regulators requiring ≥1 µF tantalum or aluminum electrolytic capacitors. |
| Pb-free SOT−89 package | Complies with RoHS Directive 2011/65/EU; compatible with standard lead-free reflow profiles (J-STD-020). |
Applications
| Handheld Video Recorders | Portable Two-Way Radios |
|---|---|
|
Use Scenario: Powering CMOS image sensor and video encoder ICs in compact field recorders operating from 2×AA or Li-ion batteries. IC Role / Device Role / Timing Role: Primary 4.0 V bias rail regulator supplying clean, low-noise voltage to analog front-end and digital logic blocks. Use Value: 0.1% line regulation prevents video banding during battery discharge; 1.2 µA quiescent current extends recording time between charges. |
Use Scenario: Providing stable 4.0 V supply to RF power amplifier bias networks and microcontroller peripherals in ruggedized PMR radios. IC Role / Device Role / Timing Role: Low-noise LDO delivering regulated voltage to sensitive RF sections while rejecting switching noise from DC–DC converters. Use Value: 100 mV dropout enables full 4.0 V output even when input sags to 4.1 V under transmit load, preserving RF output power consistency. |
| Medical Vital Sign Monitors | Industrial Handheld Scanners |
|
Use Scenario: Supplying ADC reference and signal conditioning circuitry in battery-operated pulse oximeters and ECG modules. IC Role / Device Role / Timing Role: Precision voltage source for analog signal chain components requiring stable 4.0 V reference and minimal thermal drift. Use Value: ±2.5% output tolerance and ±100 ppm/°C tempco ensure measurement accuracy across clinical operating temperatures (−30°C to +80°C). |
Use Scenario: Powering laser diode drivers and decode ASICs in warehouse barcode scanners powered by rechargeable NiMH packs. IC Role / Device Role / Timing Role: Efficient, compact LDO replacing bulkier 78L05 solutions to meet stringent size and thermal constraints. Use Value: SOT−89 package with thermal tab dissipates heat from 300 mW max PD without heatsink, enabling fanless sealed enclosure design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-4002E/MB | 1.6 µA quiescent current; 175 mV dropout at 250 mA; 250 mA output rating; SOT-23-3 package. | Higher output current but larger dropout and higher IQ; less suitable for ultra-low-power <10 µA sleep modes. | Select MCP1700T-4002E/MB only if >100 mA load capability is required and board layout accommodates SOT-23-3 footprint. |
| TPS78040DRVR | 500 nA quiescent current; 200 mV dropout at 150 mA; 200 mA output; WSON-6 package with thermal pad. | Lower IQ enables multi-year coin-cell operation, but requires 1 µF minimum output capacitance and more complex layout. | Choose TPS78040DRVR for extreme energy harvesting or coin-cell applications where 1.2 µA IQ of MC78FC40HT1 is insufficient. |
Compared with MCP1700T-4002E/MB and TPS78040DRVR, the MC78FC40HT1 offers the optimal balance of ultra-low IQ (1.2 µA), low dropout (100 mV), proven 0.1 µF stability, and industrial temperature range-all in a mature, cost-effective SOT−89 package with no layout redesign needed.
Availability
MC78FC40HT1 is available at Aetrix Electronics and suitable for handheld video instruments, portable two-way radios, and medical vital sign monitors requiring stable component supply with long-term lifecycle support.
Supply support for MC78FC40HT1 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 focused on energy-efficient electronics, with leadership in power management, analog, and sensing technologies.
The MC78FC00 series was designed specifically for micropower, low-dropout regulation in battery-powered video, communications, and portable instrumentation-prioritizing quiescent current, thermal efficiency, and ease of use with minimal external components.
FAQ
What is the guaranteed output voltage tolerance for MC78FC40HT1 over temperature?
The MC78FC40HT1 guarantees output voltage within ±2.5% of 4.0 V across its full operating ambient temperature range of −30°C to +80°C, as specified in the Electrical Characteristics table under "Output Voltage" with 3.900 V minimum and 4.100 V maximum at TJ = 25°C and Vin = 7.0 V.
Does MC78FC40HT1 require an input capacitor?
Yes, MC78FC40HT1 requires a 0.1 µF ceramic input bypass capacitor placed as close as possible to Pin 3 (Input) and Pin 2 (GND) to suppress high-frequency noise and prevent instability, especially when the regulator is located more than 4 inches from the power source per the Applications Information section.
Can MC78FC40HT1 operate with a 3.6 V lithium-ion battery input?
Yes, MC78FC40HT1 supports input voltages from 2.0 V to 10 V, making it fully compatible with a single-cell Li-ion battery (nominal 3.6 V, range ~3.0–4.2 V). At 4.1 V input and 10 mA load, its 100 mV dropout ensures stable 4.0 V output throughout most of the battery discharge curve.
What is the thermal resistance of MC78FC40HT1 in its SOT−89 package?
The MC78FC40HT1 in SOT−89 (H suffix, Case 1213) has a junction-to-ambient thermal resistance (RJA) of 333°C/W, as listed in the Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions; actual performance improves with PCB copper pour connected to the exposed tab.
Is MC78FC40HT1 pin-compatible with other devices in the MC78FC00 series?
Yes, all MC78FC00 series regulators-including MC78FC30HT1, MC78FC33HT1, MC78FC40HT1, and MC78FC50HT1-share identical SOT−89 pinout (Pin 1 = Output, Pin 2 = GND, Pin 3 = Input), enabling drop-in replacement across output voltage variants without PCB changes.
MC78FC40HT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 4V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 40mA
- Current - Output:
- 65mA
- Current - Quiescent (Iq):
- 3.6 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current
- Operating Temperature:
- -30°C ~ 80°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
MC78FC40HT1 FAQ
1.How can I place an order for MC78FC40HT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78FC40HT1 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 MC78FC40HT1 reliable?
The price and inventory of MC78FC40HT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78FC40HT1 is usually 5 days.
3.What payment methods are accepted for MC78FC40HT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78FC40HT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78FC40HT1?
MC78FC40HT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78FC40HT1 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 MC78FC40HT1?
For technical support, including MC78FC40HT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78FC40HT1 requirements.
6.How does Aetrix verify that MC78FC40HT1 is sourced from the original manufacturer or authorized distributors?
All MC78FC40HT1 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 MC78FC40HT1 meets industry standards.
7.What is the process for return or replacement of MC78FC40HT1?
All MC78FC40HT1 units undergo pre-shipment inspection (PSI). If there is an issue with MC78FC40HT1, 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 MC78FC40HT1 part is unused and in its original packaging.
Return procedure for MC78FC40HT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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