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onsemi MC7809ACTG
- Part No.:
- MC7809ACTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC7809ACTG.pdf
- Description:
- IC REG LINEAR 9V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,616
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Product details
Overview
MC7809ACTG from onsemi is a fixed-output +9.0 V, 1.0 A linear voltage regulator in TO-220 package with internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It delivers stable output under input voltages from 11.5 V to 24 V, supports peak currents up to 2.2 A, and maintains ±1.5% output tolerance over temperature and load for industrial power rail regulation.
For engineers reviewing the MC7809ACTG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, real-world design constraints (e.g., minimum 2.0 V dropout, 0.33 µF input bypass requirement), and validated alternative options for legacy 9 V supply designs.
Technical Context
The MC7809ACTG implements a monolithic NPN pass transistor architecture with built-in safe-area compensation that dynamically reduces short-circuit current as VCE increases - preventing second breakdown during overload. Its quiescent current remains stable at 3.3–6.0 mA across 11.5–26 V input range and full temperature range (−40°C to +125°C).
It achieves 56–61 dB ripple rejection at 120 Hz with 11.5–21.5 V input, and exhibits a typical output resistance of 1.0 mΩ at 1 kHz. Dropout voltage is fixed at 2.0 V at 1.0 A load and 25°C, requiring minimum input of 11.0 V for reliable 9.0 V output under worst-case line/load regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +9.0 V nominal, 8.65–9.35 V (±3.5%) at 25°C; 8.65–9.35 V over full load (5 mA–1 A) and temperature (−40°C to +125°C) |
| Output Current | 1.0 A continuous; 2.2 A peak - requires heatsink for sustained >500 mA operation due to thermal limits |
| Input Voltage Range | 11.5 V to 24 V DC - below 11.5 V causes dropout; above 24 V exceeds safe operating area |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C - mandates ≥11.0 V input for guaranteed 9.0 V output under all conditions |
| Ripple Rejection | 56 dB min at 120 Hz (11.5–21.5 V input) - sufficient for rectified AC-derived supplies with basic filtering |
| Thermal Protection | Internal shutdown at +150°C junction temperature - recovers automatically after cooldown |
| Quiescent Current | 3.3–6.0 mA - enables low-noise operation without significant standby power penalty |
Pinout & Package
MC7809ACTG uses the industry-standard TO-220 package (Case 221AB), with metal tab electrically connected to Pin 2 (Ground). Heatsinking must be applied to the tab via insulating washer if mounting to grounded chassis.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input (11.5–24 V); requires 0.33 µF bypass capacitor mounted directly across Pins 1–2 |
| Pin 2 | Ground | Common reference for input and output; tab connection enables heatsink attachment but ties to ground |
| Pin 3 | Output | Regulated +9.0 V output; no output capacitor required for stability, but 0.1–1.0 µF improves transient response |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +9.0 V output | Eliminates external feedback resistors; simplifies BOM and layout for dedicated 9 V rails |
| Internal short-circuit protection | Limits fault current to ≤0.2 A at 35 V input - prevents catastrophic failure during wiring errors or PCB shorts |
| Safe-area compensated pass transistor | Reduces short-circuit current as VCE rises - avoids secondary breakdown during overvoltage transients |
| Thermal shutdown | Activates at +150°C junction temperature - protects silicon during inadequate heatsinking or ambient rise |
| No external components required | Operates stably with only input bypass cap; reduces bill-of-materials and board space vs. adjustable regulators |
Applications
| Industrial Control Power Supply | Automotive Aftermarket Electronics |
|---|---|
|
Use Scenario: Providing clean +9 V bias to PLC I/O modules, sensor signal conditioners, and relay drivers in factory environments with 12–24 V DC bus. IC Role / Device Role / Timing Role: Primary local voltage regulator converting unregulated vehicle or panel-mount supply to stable logic-compatible rail. Use Value: Maintains 9.0 V ±3.5% across −40°C to +85°C ambient and 5 mA–1 A load - ensures consistent ADC reference and digital interface operation. |
Use Scenario: Powering aftermarket GPS trackers, dashcams, and OBD-II adapters from automotive 12 V battery systems with high ripple and cold-crank transients. IC Role / Device Role / Timing Role: Fixed-output linear regulator delivering noise-immune 9 V supply despite input dips to 6 V and surges to 35 V. Use Value: Internal thermal shutdown and safe-area compensation prevent latch-up during engine cranking or alternator load dump events. |
| Legacy Instrumentation Power | Point-of-Sale Peripheral Interface |
|
Use Scenario: Replacing obsolete 7809 variants in benchtop test equipment (e.g., multimeters, function generators) where long-term reliability and known thermal behavior are critical. IC Role / Device Role / Timing Role: Drop-in replacement for aging TO-220 9 V regulators with identical pinout and improved ripple rejection (56 dB vs. legacy 45 dB). Use Value: 1.0 mΩ output impedance and 10 µV/V noise ensure minimal impact on precision analog front-ends and reference circuits. |
Use Scenario: Powering barcode scanners, magnetic stripe readers, and receipt printers in retail kiosks using 12 V wall adapters subject to EMI and brownouts. IC Role / Device Role / Timing Role: Local regulation stage isolating sensitive peripherals from noisy shared power rails. Use Value: 2.2 A peak current capability handles motor startup surges in stepper-driven printers without output sag or reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM7809CDT/NOPB (TI) | Same TO-220 package, ±2% output tolerance (vs. ±3.5%), lower quiescent current (4.2–5.5 mA), 2.0 V dropout | Higher initial accuracy suits precision analog systems; slightly better efficiency at light loads | Select when tighter output tolerance or lower IQ is prioritized over onsemi's AEC-Q100 qualification |
| NCV7809BDTRKG (onsemi) | Automotive-grade variant: AEC-Q100 qualified, wider temp range (−40°C to +150°C), same electrical specs | Required for under-hood or safety-critical automotive applications; not needed for commercial/industrial use | Choose only if automotive PPAP compliance or extended junction temperature margin is mandatory |
Compared with LM7809CDT/NOPB, MC7809ACTG offers broader industrial temperature support and proven field reliability; compared with NCV7809BDTRKG, it trades automotive qualification for lower cost and standard industrial screening - making it optimal for non-automotive embedded power rails.
Availability
MC7809ACTG is available at Aetrix Electronics and suitable for industrial control systems, automotive aftermarket electronics, and legacy instrumentation requiring stable component supply, long-lifecycle support, and TO-220 through-hole compatibility.
Supply support for MC7809ACTG 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 is a global semiconductor supplier focused on energy-efficient electronics, delivering high-performance silicon solutions for automotive, industrial, cloud, and IoT applications.
The MC7800 series was designed as a robust, drop-in family of fixed-voltage linear regulators targeting cost-sensitive, high-reliability power conversion in industrial and automotive subsystems - emphasizing thermal resilience and fault tolerance over ultra-low IQ.
FAQ
What is the minimum input voltage required for stable operation of the MC7809ACTG?
The MC7809ACTG requires a minimum input voltage of 11.5 V DC to maintain regulated +9.0 V output across full load (5 mA–1.0 A) and temperature (−40°C to +125°C). This accounts for its 2.0 V dropout voltage and worst-case line/load regulation (±0.35 V), ensuring output stays within 8.65–9.35 V specification.
Does the MC7809ACTG require an output capacitor for stability?
No, the MC7809ACTG does not require an output capacitor for stability per its datasheet. However, adding a 0.1–1.0 µF ceramic or tantalum capacitor at the output significantly improves transient response to load steps - especially critical in microcontroller or sensor applications where rapid current changes occur.
Can the MC7809ACTG be used in automotive environments?
The MC7809ACTG is rated for industrial temperature (−40°C to +125°C) and includes thermal shutdown and short-circuit protection, but it is not AEC-Q100 qualified. For production automotive use, the pin-compatible NCV7809BDTRKG (AEC-Q100 Grade 1) is the qualified alternative - MC7809ACTG is suitable only for non-safety-critical aftermarket or under-dash accessories.
What is the maximum power dissipation of the MC7809ACTG without a heatsink?
Without a heatsink, the MC7809ACTG's thermal resistance (RJA) is 92°C/W. At 25°C ambient and 1.0 A load with 12 V input (3 V differential), power dissipation is 3 W - raising junction temperature by 276°C, far exceeding the +150°C limit. A heatsink is mandatory for any continuous load >150 mA; derating curves in the datasheet define safe operating area.
How does the MC7809ACTG handle input ripple and noise?
The MC7809ACTG provides 56 dB minimum ripple rejection at 120 Hz (typical 61 dB) for input ripple in the 11.5–21.5 V range. This attenuates 1 V RMS input ripple to ~0.5 mV RMS at the output - sufficient for most rectified AC supplies. For higher-frequency noise (>10 kHz), the 10 µV/V output noise density and 1.0 mΩ output impedance further suppress conducted interference.
MC7809ACTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 61dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
MC7809ACTG FAQ
1.How can I place an order for MC7809ACTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7809ACTG 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 MC7809ACTG reliable?
The price and inventory of MC7809ACTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7809ACTG is usually 5 days.
3.What payment methods are accepted for MC7809ACTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7809ACTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7809ACTG?
MC7809ACTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7809ACTG 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 MC7809ACTG?
For technical support, including MC7809ACTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7809ACTG requirements.
6.How does Aetrix verify that MC7809ACTG is sourced from the original manufacturer or authorized distributors?
All MC7809ACTG 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 MC7809ACTG meets industry standards.
7.What is the process for return or replacement of MC7809ACTG?
All MC7809ACTG units undergo pre-shipment inspection (PSI). If there is an issue with MC7809ACTG, 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 MC7809ACTG part is unused and in its original packaging.
Return procedure for MC7809ACTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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