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onsemi MC78FC33HT1G
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- Part No.:
- MC78FC33HT1G
- Manufacturer:
- onsemi
- Package:
- TO-243AA
- Datasheet:
-
MC78FC33HT1G.pdf
- Description:
- IC REG LINEAR 3.3V 65MA SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,125
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Product details
Overview
MC78FC33HT1G from onsemi is a micropower linear voltage regulator delivering 3.3 V ±2.5% output with ultra-low quiescent current (1.1 µA typical), 100 mV dropout at 10 mA, and up to 120 mA output current in SOT-89 package. It serves as a stable power source for battery-powered handheld communication equipment and portable video instruments.
For engineers reviewing the MC78FC33HT1G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at light load, temperature coefficient (±100 ppm/°C), line regulation (0.1%), load regulation (40–80 mV), and compatibility with low-ESR ceramic output capacitors (0.1 µF).
Technical Context
The MC78FC33HT1G integrates a precision voltage reference, error amplifier, driver transistor, and internal resistor network to set its fixed 3.3 V output. Its architecture supports operation across a wide input range (2.0 V to 10 V) while maintaining regulation down to 100 mV dropout at 10 mA load.
It features built-in current limiting and thermal shutdown protection, with specified operating ambient temperature from −30°C to +80°C and junction temperature up to +125°C. Quiescent current remains stable over temperature (1.1–1.3 µA typical), enabling multi-year battery life in low-duty-cycle applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±2.5% - ensures stable rail for 3.3 V logic and analog circuitry under varying load and temperature |
| Quiescent Current | 1.1 µA typical - enables >10-year battery life in always-on sensor nodes powered by coin cells |
| Dropout Voltage | 100 mV at 10 mA - allows regulation from 3.4 V input, critical for single-cell Li-ion or alkaline systems |
| Line Regulation | 0.1% - limits output drift to ±3.3 mV over full input range (3.4 V to 10 V) |
| Load Regulation | 40–80 mV - maintains output within ±24 mV across 1–10 mA load step changes |
| Output Current | 120 mA max - sufficient to power microcontrollers, RF transceivers, and small displays |
| Temp Coefficient | ±100 ppm/°C - contributes ≤±0.83 mV/°C drift over industrial temperature range |
Pinout & Package
SOT-89 (Case 1213, H suffix) surface-mount package with exposed tab thermally 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 | Exposed thermal pad tied internally to Pin 2; must be soldered to PCB ground plane for thermal performance and EMI control |
| 2 | Ground | Main GND reference for error amplifier and bias circuitry; connects directly to tab for low-impedance return path |
| 3 | Input | Vin supply input; requires local 0.1 µF bypass capacitor placed within 5 mm of this pin |
| 1 (Lead) | Output | Regulated 3.3 V output; requires 0.1 µF ceramic capacitor to ground for stability per datasheet Figure 6 |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.1 µA typical enables multi-year operation from CR2032 coin cell in wake-sleep IoT sensors |
| Low dropout voltage | 100 mV at 10 mA allows use with aging batteries or single-cell LiFePO₄ (3.0–3.6 V) without brownout |
| High accuracy output | ±2.5% tolerance eliminates need for external trimming in cost-sensitive consumer electronics |
| Integrated current limit | Protects device during short-circuit events without requiring external foldback circuitry |
| Pb-free SOT-89 package | RoHS-compliant leadframe and molding compound meet IPC/JEDEC J-STD-020 reflow requirements |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data via BLE every 5 minutes. IC Role / Device Role / Timing Role: Primary 3.3 V power regulator supplying MCU, radio, and analog front-end. Use Value: 1.1 µA quiescent current extends CR2032 battery life beyond 5 years; 100 mV dropout preserves regulation as battery discharges from 3.6 V to 3.0 V. | Use Scenario: Handheld pulse oximeter operating from two AAA alkaline cells (3.0 V nominal). IC Role / Device Role / Timing Role: Stable 3.3 V rail for optical sensor ADC, LED drivers, and low-power display controller. Use Value: ±2.5% output accuracy ensures consistent LED current and ADC reference; −30°C to +80°C rating supports clinical and field use. |
| Video Endoscope Camera | Industrial Handheld Scanner |
Use Scenario: Miniature camera module embedded in reusable endoscope with limited PCB area. IC Role / Device Role / Timing Role: Compact, low-noise 3.3 V supply for CMOS image sensor and video processor. Use Value: SOT-89 package fits tight mechanical envelope; 0.1 µF ceramic output cap minimizes board space and avoids tantalum reliability concerns. | Use Scenario: Rugged barcode scanner using 3.3 V logic and laser driver, powered by rechargeable NiMH pack. IC Role / Device Role / Timing Role: Main system regulator handling intermittent 100 mA peak loads during scan bursts. Use Value: 120 mA output capability sustains laser diode pulses; integrated current limit prevents damage during connector shorting events. |
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-3302E/TT | 1.6 µA quiescent current; 175 mV dropout at 10 mA; same SOT-23-3 package | Higher IQ reduces battery life by ~45% vs. MC78FC33HT1G in ultra-low-power sleep modes | Select when SOT-23 footprint is mandatory and 175 mV dropout is acceptable with higher input voltage margin |
| NCP1117DT33T5G | 6 mA quiescent current; 1.2 V dropout at 100 mA; TO-252 package; ±2% accuracy | Not suitable for coin-cell or long-life battery applications due to high IQ; better for wall-powered systems | Select only for cost-sensitive, non-battery applications where thermal mass of DPAK supports higher dissipation |
Compared with MCP1700T-3302E/TT and NCP1117DT33T5G, the MC78FC33HT1G uniquely balances ultra-low IQ (1.1 µA), low dropout (100 mV), and SOT-89 thermal performance-making it optimal for space- and energy-constrained portable medical and sensor devices.
Availability
MC78FC33HT1G is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, and video endoscope cameras requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MC78FC33HT1G 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 manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC78FC00 series was designed specifically for micropower, ultra-low-dropout regulation in battery-powered video and communications equipment-prioritizing quiescent current, accuracy, and thermal efficiency in compact packages.
FAQ
What is the maximum input voltage for the MC78FC33HT1G?
The MC78FC33HT1G supports a maximum input voltage of 10 V DC, as specified in its Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable long-term use, the recommended input range is 3.4 V to 8.0 V to maintain regulation while respecting the 100 mV dropout specification at 10 mA load.
Does the MC78FC33HT1G require an output capacitor, and what type is recommended?
Yes, the MC78FC33HT1G requires a 0.1 µF ceramic capacitor between VO and GND for stability, as confirmed in the Applications Information section and Figure 6. Aluminum, tantalum, or multilayer ceramic capacitors are acceptable, but solid tantalum is preferred below −25°C. Electrolytic types are discouraged below −30°C due to ESR rise and capacitance loss.
Is the MC78FC33HT1G pin-compatible with other regulators in the MC78FC00 series?
Yes, all MC78FC00 series variants-including MC78FC30HT1G, MC78FC33HT1G, MC78FC40HT1G, and MC78FC50HT1G-share identical SOT-89 pinout (Pin 1 = Output, Pin 2 = GND, Pin 3 = Input) and thermal pad connection. This allows direct substitution within the same output voltage family when board layout accommodates the specific voltage requirement.
What is the thermal resistance (RJA) of the MC78FC33HT1G in its SOT-89 package?
The MC78FC33HT1G has a junction-to-ambient thermal resistance (RJA) of 111°C/W in the SOT-89 (Case 1213) package, as stated in the Maximum Ratings table. This value assumes standard JEDEC test conditions (single-layer 1-inch² copper pad); actual RJA improves significantly with larger ground planes and thermal vias beneath the exposed tab.
Can the MC78FC33HT1G be used in automotive applications?
The MC78FC33HT1G is not qualified for automotive applications. Its specified operating ambient temperature range is −30°C to +80°C, and it lacks AEC-Q100 qualification. While it may function in some cabin-mounted modules, onsemi does not guarantee performance or reliability under automotive stress conditions such as extended temperature cycling, vibration, or ISO 7637-2 transients.
MC78FC33HT1G 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 40mA
- Current - Output:
- 65mA
- Current - Quiescent (Iq):
- 3.3 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
MC78FC33HT1G FAQ
1.How can I place an order for MC78FC33HT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC78FC33HT1G 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 MC78FC33HT1G reliable?
The price and inventory of MC78FC33HT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC78FC33HT1G is usually 5 days.
3.What payment methods are accepted for MC78FC33HT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC78FC33HT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC78FC33HT1G?
MC78FC33HT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC78FC33HT1G 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 MC78FC33HT1G?
For technical support, including MC78FC33HT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC78FC33HT1G requirements.
6.How does Aetrix verify that MC78FC33HT1G is sourced from the original manufacturer or authorized distributors?
All MC78FC33HT1G 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 MC78FC33HT1G meets industry standards.
7.What is the process for return or replacement of MC78FC33HT1G?
All MC78FC33HT1G units undergo pre-shipment inspection (PSI). If there is an issue with MC78FC33HT1G, 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 MC78FC33HT1G part is unused and in its original packaging.
Return procedure for MC78FC33HT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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