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onsemi MC7809CT
- Part No.:
- MC7809CT
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC7809CT.pdf
- Description:
- IC REG LINEAR 9V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,497
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Product details
Overview
MC7809CT 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 5.0 mA–1.0 A load, requires no external components for basic operation, and is used in local on-card regulation for industrial control, power supplies, and embedded systems.
For engineers reviewing the MC7809CT datasheet, pinout, applications, or equivalent options, this page provides verified specifications, thermal performance data, input/output voltage margin requirements, and validated alternative parts for design-in and supply continuity planning.
Technical Context
The MC7809CT employs a monolithic bipolar pass transistor with built-in safe-area compensation to dynamically reduce short-circuit current as VCE increases-preventing second breakdown during fault conditions. Its internal bandgap reference and error amplifier maintain ±2% output tolerance (TJ = 25°C) and −0.5 mV/°C temperature coefficient.
It operates with a minimum input-to-output differential of 2.0 V at 1.0 A load and supports up to 35 V DC input. Ripple rejection is 56 dB at 120 Hz (11.5–21.5 VIN, IO = 500 mA), and output noise is 10 µV/VO (10 Hz–100 kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +9.0 V nominal; 8.65–9.35 V over full temp/load range (±3.9% total variation) |
| Output Current | 1.0 A continuous; peak 2.2 A (short duration, thermally limited) |
| Input Voltage Range | 11.5–24 VDC; must exceed VOUT by ≥2.0 V under all operating conditions |
| Dropout Voltage | 2.0 V at 1.0 A and TJ = 25°C - defines minimum headroom for regulation |
| Ripple Rejection | 56 dB at 120 Hz (11.5–21.5 VIN, IO = 500 mA) - critical for noisy AC/DC front-end filtering |
| Quiescent Current | 3.4 mA typical; increases ≤0.8 mA over full input voltage and load range |
| Thermal Shutdown | Activates at TJ ≈ +150°C; auto-recovery after cooldown - prevents permanent damage |
Pinout & Package
MC7809CT uses the standard TO-220 (Case 221AB) package with metal tab electrically connected to Pin 2 (Ground). Heatsinking is required for >500 mA continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input; must be ≥11.5 V and ≤24 V; bypass capacitor (≥0.33 µF) required if remote from filter |
| Pin 2 | Ground | Common reference for input and output; heatsink surface tied to this pin - critical for thermal path integrity |
| Pin 3 | Output | Regulated +9.0 V output; optional 0.1 µF ceramic improves transient response but not required for stability |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +9.0 V output | Eliminates external resistor network; reduces BOM count and layout complexity vs. adjustable regulators |
| Internal short-circuit protection | Limits output current to ~0.2 A during sustained short - protects IC and upstream supply without external fusing |
| Safe-area compensated pass transistor | Prevents thermal runaway during high-VCE/high-IC faults - enables robust operation in unregulated input scenarios |
| No external components required | Enables minimal footprint implementation; only input bypass cap needed for long trace runs or large capacitive loads |
| Pb-free TO-220 package | Complies with RoHS; compatible with standard through-hole reflow and wave soldering processes |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Local 9 V rail generation from 12–24 V vehicle battery or industrial 24 V bus. IC Role / Device Role / Timing Role: Primary linear regulator supplying microcontroller core logic, CAN transceivers, and sensor interfaces. Use Value: Internal thermal shutdown prevents latch-up during cold-crank (low-battery) or load-dump events; 2.0 V dropout allows operation down to 11.5 VIN. |
Use Scenario: Powering low-power MCU peripherals (LIN, EEPROM, LED drivers) in door modules or seat controllers. IC Role / Device Role / Timing Role: Fixed-voltage local regulator decoupled from main ECU supply to isolate noise-sensitive functions. Use Value: ±2% output tolerance ensures reliable ADC reference and I/O voltage levels; 56 dB ripple rejection suppresses alternator noise. |
| Embedded System Board Power | Test & Measurement Equipment |
|
Use Scenario: On-board 9 V rail for FPGA I/O banks, op-amp signal conditioning, and isolated communication interfaces. IC Role / Device Role / Timing Role: Secondary regulation stage following switching pre-regulator; provides low-noise analog supply. Use Value: 10 µV/VO output noise (10 Hz–100 kHz) minimizes interference in precision analog paths; TO-220 allows bolt-on heatsink for 1 A continuous load. |
Use Scenario: Calibration-grade auxiliary supply for reference voltage generators and metrology-grade DACs. IC Role / Device Role / Timing Role: Stable DC source for biasing precision resistive dividers and low-drift amplifiers. Use Value: −0.5 mV/°C temperature coefficient limits output drift to <±10 mV over 0–70°C ambient; tight 8.65–9.35 V spec ensures measurement repeatability. |
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 (Texas Instruments) | Same 9 V output, 1.0 A rating, TO-220 package; ±2% tolerance; slightly higher quiescent current (4.2 mA typ) | Identical pinout and thermal profile; lower ripple rejection (50 dB @ 120 Hz) - less suitable for high-noise environments | Select when TI supply chain alignment or dual-sourcing across vendors is required; verify ripple rejection margin in final design |
| NCV7809BDTAR4G (onsemi) | Automotive-grade variant; AEC-Q100 qualified; same electrical specs but tighter production controls and PPAP support | Required for automotive OEM designs; extended temp range (−40°C to +150°C); identical pinout and footprint | Choose for automotive applications requiring qualification documentation and zero-defect manufacturing traceability |
Compared with LM7809CDT/NOPB, MC7809CT offers 6 dB better ripple rejection and lower quiescent current, improving noise immunity in industrial settings; versus NCV7809BDTAR4G, it lacks AEC-Q100 certification but provides cost-optimized performance for non-automotive use.
Availability
MC7809CT is available at Aetrix Electronics and suitable for industrial control systems, embedded power management, and test equipment requiring stable component supply with consistent parametric performance and long-term lifecycle support.
Supply support for MC7809CT 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 innovation for automotive, industrial, cloud, and IoT applications.
The MC7800 series was designed as a rugged, drop-in fixed-voltage linear regulator family for local on-card regulation where simplicity, reliability, and thermal robustness are prioritized over efficiency.
FAQ
What is the minimum input voltage required for MC7809CT to regulate properly?
The MC7809CT requires a minimum input voltage of 11.5 V DC to maintain regulation across its full operating temperature and load range. This accounts for the 2.0 V dropout voltage at 1.0 A and ensures stable +9.0 V output even under worst-case conditions including line and load transients. Input below 11.5 V risks dropout and unregulated output.
Does MC7809CT require input and output capacitors for stable operation?
MC7809CT does not require output capacitance for stability, but a 0.1 µF ceramic capacitor is recommended to improve transient response. An input bypass capacitor (≥0.33 µF tantalum or low-ESR ceramic) is required if the regulator is located more than 2 inches from the bulk filter capacitor - this prevents oscillation due to trace inductance.
Can MC7809CT be used in parallel to increase output current?
No - MC7809CT is not designed for parallel operation. Its output voltage tolerance (±2%) and lack of current-sharing circuitry cause unequal load distribution, risking thermal runaway in one device. For >1.0 A, use a higher-current regulator (e.g., MC7812CT) or a discrete pass transistor configuration with current-sense feedback.
What thermal considerations apply when using MC7809CT at 1.0 A output?
At 1.0 A with 15 V input, MC7809CT dissipates ~6 W (6 V × 1 A). With RJA = 92°C/W (no heatsink), junction temperature would exceed 150°C. A heatsink reducing RJA to ≤30°C/W is mandatory. Mounting the TO-220 tab directly to a copper plane or extruded aluminum heatsink ensures safe operation within thermal shutdown limits.
Is MC7809CT pin-compatible with other MC7800-series regulators like MC7805CT or MC7812CT?
Yes - all MC7800-series TO-220 devices (including MC7805CT, MC7809CT, and MC7812CT) share identical pinout (Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output) and mechanical footprint. This enables direct substitution in existing layouts when changing output voltage, provided input voltage and thermal margins are re-verified for the new VOUT.
MC7809CT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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):
- 8 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
MC7809CT FAQ
1.How can I place an order for MC7809CT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7809CT 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 MC7809CT reliable?
The price and inventory of MC7809CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7809CT is usually 5 days.
3.What payment methods are accepted for MC7809CT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7809CT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7809CT?
MC7809CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7809CT 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 MC7809CT?
For technical support, including MC7809CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7809CT requirements.
6.How does Aetrix verify that MC7809CT is sourced from the original manufacturer or authorized distributors?
All MC7809CT 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 MC7809CT meets industry standards.
7.What is the process for return or replacement of MC7809CT?
All MC7809CT units undergo pre-shipment inspection (PSI). If there is an issue with MC7809CT, 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 MC7809CT part is unused and in its original packaging.
Return procedure for MC7809CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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