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onsemi MC7809CD2TG
- Part No.:
- MC7809CD2TG
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7809CD2TG.pdf
- Description:
- IC REG LINEAR 9V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,462
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Product details
Overview
MC7809CD2TG from onsemi is a fixed-output +9.0 V, 1.0 A linear voltage regulator in D2PAK-3 (TO-263) package, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It delivers stable DC power for industrial control modules, automotive body electronics, and embedded power supplies where input ripple rejection and robust fault protection are required.
For engineers reviewing the MC7809CD2TG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, real-world use cases, and validated alternative parts - all aligned with onsemi's MC7800 Series documentation (Rev. 29, Nov. 2021).
Technical Context
The MC7809CD2TG implements a monolithic series pass transistor architecture with built-in current limiting and thermal foldback. Its dropout voltage remains ≤2.0 V at 1.0 A output current and 25°C junction temperature, enabling operation with input voltages as low as 11.5 Vdc under full load.
It achieves ≥56 dB ripple rejection at 120 Hz across its specified input range (11.5–24 Vdc), and maintains output voltage tolerance of ±5% over temperature (−40°C to +125°C) and load (5 mA to 1.0 A), per MC7809C grade specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +9.0 V nominal, ±5% tolerance (8.55–9.45 V) over full load and temperature range |
| Output Current | 1.0 A continuous; peak up to 2.2 A for short durations with adequate heatsinking |
| Dropout Voltage | ≤2.0 V at 1.0 A and 25°C - defines minimum headroom needed between input and output |
| Ripple Rejection | ≥56 dB at 120 Hz (11.5–21.5 V input), critical for noisy automotive or industrial supply rails |
| Quiescent Current | 3.4 mA typical (max 8.0 mA), enabling low-noise regulation without excessive idle power loss |
| Thermal Protection | Internal thermal shutdown activates at +150°C junction temperature, preventing permanent damage |
| Short-Circuit Limit | 0.2 A typical short-circuit current limit - protects upstream circuitry during output faults |
Pinout & Package
D2PAK-3 (TO-263) surface-mount package with exposed metal tab thermally and electrically connected to Pin 2 (Ground). Requires PCB copper pour for heatsinking to sustain 1.0 A continuous output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input (Vin) | Unregulated positive DC input; must exceed 11.5 V for full-load 9 V output |
| 2 | Ground (GND) | Common reference for input and output; tab connection enables thermal conduction to PCB |
| 3 | Output (Vout) | Regulated +9.0 V output; bypass capacitor (≥0.33 µF) recommended at point-of-load |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation - eliminates need for external feedback resistors or compensation networks |
| Internal safe-area compensation | Reduces short-circuit current as pass transistor VCE increases, preventing second breakdown |
| Thermal overload protection | Automatic shutdown at TJ = +150°C; resumes operation after cooldown - no manual reset needed |
| 1.5% to 4% output tolerance options | MC7809CD2TG uses C-grade (±5% total tolerance including temp/load/line effects) |
| Pb-free and RoHS-compliant | Meets environmental compliance requirements for industrial and automotive production |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Powering microcontroller peripherals (ADCs, UARTs, GPIOs) in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary local +9 V rail generator from 24 VDC field bus, providing noise-isolated analog/digital supply. Use Value: 56 dB ripple rejection suppresses switching noise from adjacent 24 V DC-DC converters, ensuring <10 µVpp output noise for precision sensor interfaces. |
Use Scenario: Supplying door module ECUs handling window lift, mirror adjustment, and interior lighting. IC Role / Device Role / Timing Role: Fixed +9 V bias for LIN transceivers and motor driver logic, tolerant of battery voltage transients (up to 35 V). Use Value: Internal short-circuit protection limits fault current to 0.2 A during wiring shorts, preventing fuse blowouts and enabling graceful degradation. |
| Embedded Medical Sensor Hub | Point-of-Sale Terminal Power Management |
Use Scenario: Regulating auxiliary supply for optical heart-rate sensors and low-power BLE radios in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-quiescent (3.4 mA typ.) +9 V source from Li-ion battery via boost converter, minimizing standby drain. Use Value: Thermal shutdown prevents overheating during extended high-current BLE bursts, maintaining safety certification compliance. |
Use Scenario: Providing stable +9 V for thermal print head drivers and secure element ICs in retail kiosks. IC Role / Device Role / Timing Role: Local regulation stage decoupling noisy 12 V SMPS, reducing EMI coupling into payment interface circuits. Use Value: Dropout ≤2.0 V allows operation down to 11.5 V input - accommodates brownout conditions during AC line sags without 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 |
|---|---|---|---|
| LM7809CD2TR4G | Same +9 V output, 1.0 A rating, D2PAK package; lower ripple rejection (50 dB @ 120 Hz) and wider output tolerance (±6%) | Lacks automotive qualification; not AEC-Q100 rated - unsuitable for BCU or ADAS subsystems | Select when cost sensitivity outweighs ripple/noise requirements and automotive compliance is unnecessary |
| NCV7809BD2TR4G | Automotive-grade variant with tighter ±2% output tolerance and guaranteed operation from −40°C to +150°C | Higher cost and longer lead times; over-specified for non-automotive industrial use | Choose for mission-critical automotive applications requiring PPAP documentation and extended temperature validation |
Compared with LM7809CD2TR4G, MC7809CD2TG offers superior ripple rejection and broader industrial temperature support; versus NCV7809BD2TR4G, it trades tighter tolerance and automotive qualification for lower unit cost and faster availability in commercial designs.
Availability
MC7809CD2TG is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and embedded medical devices requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MC7809CD2TG 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC7800 Series - including MC7809CD2TG - was designed for rugged, self-protected local regulation in harsh environments where reliability, thermal resilience, and fault containment are prioritized over ultra-low quiescent current or adjustable output.
FAQ
What is the maximum input voltage rating for MC7809CD2TG?
The absolute maximum input voltage for MC7809CD2TG is 35 Vdc, as specified in the "Maximum Ratings" table. Operation above this level risks permanent damage due to junction breakdown. For reliable 1.0 A output, the recommended input range is 11.5 Vdc to 24 Vdc - ensuring sufficient headroom while staying within safe power dissipation limits. Always verify thermal design when operating near maximum ratings.
Does MC7809CD2TG require an input bypass capacitor?
Yes - MC7809CD2TG requires a minimum 0.33 µF input bypass capacitor (tantalum, ceramic, or low-ESR electrolytic) placed directly across Pins 1 and 2. This stabilizes the regulator under fast load transients and suppresses high-frequency noise from upstream sources. Without it, instability or oscillation may occur, especially with long input traces or high-impedance supplies. The datasheet explicitly recommends this in the "Applications Information" section.
Can MC7809CD2TG be used in adjustable-voltage configurations?
Yes - MC7809CD2TG can be configured as an adjustable regulator using external resistors and a Zener diode, as shown in Figure 10 of the official datasheet. However, doing so forfeits its factory-trimmed +9.0 V accuracy and introduces additional error sources (resistor tolerance, Zener drift). For precise adjustable outputs, dedicated LDOs like the LM317 are preferred; MC7809CD2TG is optimized for fixed +9 V operation.
What is the thermal resistance (RθJC) of MC7809CD2TG in D2PAK-3 package?
The junction-to-case thermal resistance (RθJC) for MC7809CD2TG in D2PAK-3 package is 5.0°C/W, per the "Maximum Ratings" table. This value assumes direct thermal contact between the exposed metal tab (Pin 2/Ground) and a sufficiently large PCB copper pour. Effective heatsinking is essential to maintain TJ ≤ +150°C at 1.0 A output - especially with input voltages >15 Vdc.
Is MC7809CD2TG pin-compatible with other MC7800-series regulators?
Yes - MC7809CD2TG shares identical D2PAK-3 pinout (Pin 1: Input, Pin 2: Ground, Pin 3: Output) with all MC78xxxD2TG variants (e.g., MC7805CD2TG, MC7812CD2TG). This enables board-level voltage rail upgrades or downgrades without layout changes, provided input voltage and thermal constraints are re-evaluated for the new output voltage.
MC7809CD2TG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- 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):
- 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:
- Surface Mount
- Supplier Device Package:
- D2PAK-3
MC7809CD2TG FAQ
1.How can I place an order for MC7809CD2TG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7809CD2TG 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 MC7809CD2TG reliable?
The price and inventory of MC7809CD2TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7809CD2TG is usually 5 days.
3.What payment methods are accepted for MC7809CD2TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7809CD2TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7809CD2TG?
MC7809CD2TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7809CD2TG 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 MC7809CD2TG?
For technical support, including MC7809CD2TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7809CD2TG requirements.
6.How does Aetrix verify that MC7809CD2TG is sourced from the original manufacturer or authorized distributors?
All MC7809CD2TG 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 MC7809CD2TG meets industry standards.
7.What is the process for return or replacement of MC7809CD2TG?
All MC7809CD2TG units undergo pre-shipment inspection (PSI). If there is an issue with MC7809CD2TG, 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 MC7809CD2TG part is unused and in its original packaging.
Return procedure for MC7809CD2TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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