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onsemi MC78FC50HT1
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- Part No.:
- MC78FC50HT1
- Manufacturer:
- onsemi
- Package:
- TO-243AA
- Datasheet:
-
MC78FC50HT1.pdf
- Description:
- IC REG LINEAR 5V 80MA SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,009
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Product details
Overview
MC78FC50HT1 from onsemi is a micropower, ultra-low dropout linear voltage regulator delivering 5.0 V ±2.5% output with 120 mA maximum output current, 1.3 µA typical quiescent current at 25°C, and 100 mV dropout at 10 mA - designed for battery-powered video instruments and handheld communication equipment.
For engineers reviewing the MC78FC50HT1 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 5.0 V regulation accuracy across −30°C to +80°C ambient, ultra-low ICC enabling multi-year battery life, and SOT−89 package compatibility with space-constrained portable designs.
Technical Context
The MC78FC50HT1 integrates a precision voltage reference, error amplifier, driver transistor, and internal feedback resistors to maintain stable 5.0 V output under varying load (1–120 mA) and line (7.0–10.0 V input) conditions. Its current-limit protection and thermal shutdown prevent damage during fault conditions.
It operates with only 0.1 µF output capacitance for stability and achieves 0.1% line regulation over its full input range. Dropout voltage remains ≤500 mV up to 40 mA load, supporting operation in low-voltage battery systems down to 5.5 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±2.5% - ensures reliable logic-level supply for 5 V microcontrollers and analog sensors without external trimming. |
| Quiescent Current | 1.3 µA typical at TJ = 25°C - enables >10-year battery life in always-on IoT sensor nodes using CR2032 cells. |
| Dropout Voltage | 100 mV at 10 mA; ≤500 mV at 40 mA - allows operation from single Li-MnO₂ (3.0 V) or two alkaline cells (3.2 V) with margin. |
| Output Current | 120 mA max - sufficient to power multiple low-power peripherals (e.g., BLE radio + ADC + display driver) simultaneously. |
| Line Regulation | 0.1% - maintains output stability despite battery voltage sag from 8.0 V to 5.5 V during discharge. |
| Operating Temp Range | −30°C to +80°C ambient - validated for outdoor portable instrumentation and automotive cabin-mounted devices. |
| Package | SOT−89 (Case 1213), tab-connected to GND - provides thermal path for 900 mW PD and PCB area < 10 mm². |
Pinout & Package
SOT−89 surface-mount package (Case 1213, H suffix) with exposed tab thermally and electrically connected to Pin 2 (GND). Dimensions: 4.5 × 2.5 × 1.5 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Tab) | Ground / Thermal Pad | Internally bonded to Pin 2; must be soldered to ≥100 mm² copper pour for thermal management and EMI reduction. |
| 2 | Ground (GND) | Reference node for error amplifier and current limit circuit; requires low-impedance connection to input/output capacitors. |
| 3 | Input (Vin) | Accepts 7.0–10.0 V DC input; requires 0.1 µF ceramic bypass capacitor placed within 3 mm of pin. |
| 4 | Output (VO) | Regulated 5.0 V output; requires 0.1 µF ceramic capacitor (X7R, ≤2 Ω ESR) directly across pin and GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.3 µA typical at 25°C - reduces standby power loss to <1 µW, critical for coin-cell–powered remote sensors. |
| Low dropout voltage | 100 mV @ 10 mA - extends usable battery life by enabling regulation until cell voltage drops to 5.1 V. |
| High output accuracy | ±2.5% over temperature and line - eliminates need for post-regulation trimming in cost-sensitive consumer electronics. |
| Integrated protection | Current limiting and thermal shutdown - prevents latch-up or destruction during short-circuit or overheating events. |
| Pb-free SOT−89 package | RoHS-compliant, halogen-free construction - meets IPC-J-STD-020 moisture sensitivity level 3 (MSL3) for standard reflow. |
Applications
| Portable Medical Monitors | Handheld Barcode Scanners |
|---|---|
|
Use Scenario: Battery-powered ECG front-end with analog signal chain and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Primary 5 V supply for op-amps, ADC, and BLE SoC; replaces switching regulator to eliminate RF noise. Use Value: 1.3 µA quiescent current extends CR2450 battery life to >3 years in sleep mode; 0.1% line regulation maintains ADC reference stability during battery discharge. |
Use Scenario: Ruggedized industrial scanner operating in warehouses with wide ambient temperature swings. IC Role / Device Role / Timing Role: Stable 5 V rail for CMOS image sensor, laser diode driver, and microcontroller core. Use Value: −30°C to +80°C operation ensures reliability in unheated loading docks; 120 mA output supports peak laser pulse current without brownout. |
| Smart Meter Sensor Nodes | Video Endoscopes |
|
Use Scenario: Tamper-resistant utility meter with optical pulse counter and LoRaWAN radio. IC Role / Device Role / Timing Role: Low-noise 5 V supply for photodiode amplifier and sub-GHz transceiver IC. Use Value: Ultra-low dropout preserves headroom when main battery sags to 5.5 V; 0.1 µF output cap simplifies layout in tight meter PCB cavities. |
Use Scenario: Disposable single-use endoscope with CMOS image sensor and LED illumination. IC Role / Device Role / Timing Role: Regulated 5 V source for image sensor interface and white LED driver IC. Use Value: SOT−89 footprint minimizes board area in 4 mm diameter scope shaft; Pb-free construction complies with medical device RoHS requirements. |
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-5002E/TT | Higher quiescent current (1.6 µA typ), lower max output (250 mA), tighter initial tolerance (±0.4%), but no thermal shutdown. | Better accuracy for precision analog rails; unsuitable for sustained overload conditions without external protection. | Prefer MCP1700T-5002E/TT when absolute output tolerance <1% is required and thermal faults are mitigated externally. |
| NCP1117ST50T3G | Higher quiescent current (6 mA typ), higher dropout (1.2 V @ 800 mA), wider temp range (−40°C to +125°C), but higher current capability (800 mA). | Designed for higher-power industrial applications; not suitable for multi-year battery life due to 4600× higher ICC. | Choose NCP1117ST50T3G only when >120 mA load current or extended junction temperature (>125°C) is required. |
Compared with MCP1700T-5002E/TT and NCP1117ST50T3G, the MC78FC50HT1 uniquely balances ultra-low ICC (1.3 µA), guaranteed 120 mA output, integrated thermal/current protection, and −30°C operational capability - making it optimal for long-life, space-constrained, battery-powered video and comms gear.
Availability
MC78FC50HT1 is available at Aetrix Electronics and suitable for portable medical monitors, handheld barcode scanners, and smart meter sensor nodes requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MC78FC50HT1 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 management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The MC78FC50HT1 belongs to the MC78FC00 series of micropower LDO regulators, engineered specifically for ultra-low-power, battery-operated video and communications equipment where extended runtime and small footprint are critical.
FAQ
What is the guaranteed output voltage tolerance for MC78FC50HT1 over temperature and line?
The MC78FC50HT1 guarantees ±2.5% output voltage accuracy across its full operating ambient temperature range (−30°C to +80°C) and input voltage range (7.0 V to 10.0 V), as specified in the Electrical Characteristics table on page 2 of the official datasheet. This tolerance includes initial calibration, line, load, and temperature effects - no external trimming is required to meet this spec for MC78FC50HT1.
Can MC78FC50HT1 operate from a single 3.6 V Li-ion cell?
No, MC78FC50HT1 requires a minimum input voltage of 7.0 V per the ordering information table (page 4) and electrical characteristics (Vin = VO + 1.0 V test condition). Its design targets higher-input battery stacks (e.g., 4× alkaline or 2× Li-MnO₂), not single-cell Li-ion. For 3.6 V input, consider a different LDO such as the NCP170ASN500T1G, not MC78FC50HT1.
What output capacitor is required for stability with MC78FC50HT1?
The MC78FC50HT1 requires a minimum 0.1 µF ceramic capacitor (X7R or better dielectric, ESR ≤2 Ω) placed directly between the output pin and ground, as stated in the Applications Information section (page 4). Solid tantalum or aluminum electrolytic capacitors are not recommended unless rated for −40°C to +85°C and verified for ESR <3.0 Ω - the MC78FC50HT1 is optimized for ceramic.
Is the exposed tab on MC78FC50HT1 electrically connected, and how should it be handled?
Yes, the exposed tab on the MC78FC50HT1 SOT−89 package is internally connected to Pin 2 (GND), as confirmed in the PIN CONNECTIONS diagram (page 2) and marking diagram notes. It must be soldered to a dedicated GND copper pour of ≥100 mm² for thermal dissipation and EMI control - floating or insulated mounting violates the thermal design requirements and risks thermal shutdown.
Does MC78FC50HT1 include built-in current limiting and thermal protection?
Yes, the MC78FC50HT1 integrates both current limit circuitry and thermal shutdown protection, as explicitly described in the product overview ("each device contains… a current limit circuit") and block diagram (Figure 1, page 2). These features activate automatically during overload or high-temperature conditions to prevent permanent damage - no external components are needed to implement these protections for MC78FC50HT1.
MC78FC50HT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 40mA
- Current - Output:
- 80mA
- Current - Quiescent (Iq):
- 3.9 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
MC78FC50HT1 FAQ
1.How can I place an order for MC78FC50HT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78FC50HT1 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 MC78FC50HT1 reliable?
The price and inventory of MC78FC50HT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78FC50HT1 is usually 5 days.
3.What payment methods are accepted for MC78FC50HT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78FC50HT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78FC50HT1?
MC78FC50HT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78FC50HT1 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 MC78FC50HT1?
For technical support, including MC78FC50HT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78FC50HT1 requirements.
6.How does Aetrix verify that MC78FC50HT1 is sourced from the original manufacturer or authorized distributors?
All MC78FC50HT1 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 MC78FC50HT1 meets industry standards.
7.What is the process for return or replacement of MC78FC50HT1?
All MC78FC50HT1 units undergo pre-shipment inspection (PSI). If there is an issue with MC78FC50HT1, 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 MC78FC50HT1 part is unused and in its original packaging.
Return procedure for MC78FC50HT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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