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onsemi MC7809BTG
- Part No.:
- MC7809BTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC7809BTG.pdf
- Description:
- IC REG LINEAR 9V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,605
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Product details
Overview
MC7809BTG from onsemi is a fixed-output linear voltage regulator delivering +9.0 V at up to 1.0 A, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation for robust local regulation in industrial power supplies and embedded control systems.
For engineers reviewing the MC7809BTG datasheet, pinout, applications, or equivalent options, this page provides verified specifications, TO-220 package details, real-world use cases, and validated alternative parts for design-in and supply continuity planning.
Technical Context
The MC7809BTG implements a monolithic series pass transistor architecture with built-in protection circuitry including thermal overload detection, foldback current limiting, and junction temperature–dependent safe-area compensation. It operates without external components for basic regulation but supports adjustable output configurations via external resistors.
Designed for fixed-voltage local regulation, it requires a minimum input-to-output differential of 2.0 V (dropout) and delivers stable output across −40°C to +125°C junction temperature, with output voltage tolerance of ±4% at 25°C and ±5% over full load/temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +9.0 V nominal, ±4% at 25°C; maintains ±5% over 5 mA–1.0 A load and −40°C to +125°C TJ |
| Output Current | 1.0 A continuous; peak output current up to 2.2 A for short durations with adequate heatsinking |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C - dictates minimum input voltage of 11.0 V for reliable 9 V output |
| Ripple Rejection | 56 dB at 120 Hz (11.5–21.5 VIN) - suppresses AC ripple from unregulated DC sources |
| Quiescent Current | 3.4 mA typical at 1.0 A load - low bias draw enables efficient operation in always-on systems |
| Thermal Protection | Internal shutdown activates at +150°C junction temperature - prevents permanent damage during overload |
| Short-Circuit Limit | 0.2 A typical at 35 VIN - limits fault current to protect upstream circuitry and PCB traces |
Pinout & Package
MC7809BTG uses the industry-standard TO-220 package (Case 221AB), with metal tab electrically connected to Pin 2 (Ground). Heatsinking is required for sustained 1.0 A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input; must be ≥11.0 V and ≤35 V for safe operation |
| Pin 2 | Ground | Common reference for input and output; metal tab is internally tied to this pin |
| Pin 3 | Output | Regulated +9.0 V output; requires 0.33 µF input bypass capacitor if >10 cm from filter |
Key Features
| Feature | Design Value |
|---|---|
| No external components needed | Enables plug-and-play integration in point-of-load designs without feedback network or compensation parts |
| Internal thermal shutdown | Automatically disables output above +150°C junction temperature, resuming operation after cooldown |
| Safe-area compensated pass transistor | Reduces short-circuit current as VCE increases - prevents second breakdown during fault conditions |
| ±4% output tolerance (B grade) | Meets industrial-grade accuracy requirements without trimming; tighter than C-grade (±5%) |
| Pb-free and RoHS-compliant | Meets global environmental compliance standards for commercial and industrial manufacturing |
Applications
| Industrial PLC Power Rails | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Providing clean +9 V rail for microcontroller I/O peripherals and sensor interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Fixed-voltage local regulator supplying logic-level power to isolated digital subsystems. Use Value: Maintains stable 9 V output under 5–1000 mA dynamic loads and withstands 35 V transients per automotive load-dump immunity specs. |
Use Scenario: Regulating battery-derived 12 V to +9 V for CAN transceiver bias and MCU analog peripherals in body electronics. IC Role / Device Role / Timing Role: Primary DC-DC conversion stage for non-switching, low-noise auxiliary power domain. Use Value: Delivers 1.0 A with 56 dB ripple rejection at 120 Hz - suppresses alternator noise before sensitive analog circuits. |
| Point-of-Load Regulation in Test Equipment | Legacy Industrial Instrumentation |
|
Use Scenario: Generating precision +9 V for op-amp biasing and ADC reference buffers in benchtop multimeters and signal analyzers. IC Role / Device Role / Timing Role: Low-noise linear regulator ensuring minimal VOUT drift (<±0.5 mV/°C) across operating temperature. Use Value: Output noise of 10 µV/V enables <16-bit effective resolution in high-accuracy measurement front-ends. |
Use Scenario: Replacing aging 7809 regulators in legacy motor drives and HVAC controllers where board space and BOM count are constrained. IC Role / Device Role / Timing Role: Drop-in compatible upgrade offering same pinout, thermal behavior, and protection features as original 78xx family. Use Value: TO-220 footprint and identical electrical interface enable direct replacement without layout changes or firmware updates. |
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 (tighter), higher quiescent current (6.5 mA typ), lower ripple rejection (45 dB) | Better initial accuracy but reduced noise immunity; suited for calibration-critical analog rails | Select when ±2% output stability outweighs need for high ripple suppression |
| NCV7809BD2TR4G (onsemi) | D2PAK-3 surface-mount variant; identical electrical specs, AEC-Q100 qualified, no through-hole mounting | Designed for automotive production; requires rework of PCB layout and assembly process | Choose for new automotive designs requiring PPAP support and SMT manufacturability |
Compared with LM7809CDT/NOPB, MC7809BTG offers superior ripple rejection and lower quiescent current but looser initial tolerance; versus NCV7809BD2TR4G, it retains through-hole compatibility and simplifies prototyping while sharing core protection and thermal behavior.
Availability
MC7809BTG is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and test instrumentation requiring stable component supply with long lifecycle visibility and traceable sourcing.
Supply support for MC7809BTG 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, with leadership in power management and analog solutions.
The MC7800 series was designed for rugged, cost-effective fixed-voltage regulation in harsh environments - emphasizing reliability, integrated protection, and drop-in compatibility across decades of industrial equipment.
FAQ
What is the maximum input voltage rating for MC7809BTG?
The absolute maximum input voltage for MC7809BTG is 35 V DC, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage even with brief exposure. For reliable long-term use, input should remain ≤30 V with appropriate derating for ambient temperature and heatsink performance.
Does MC7809BTG require an input bypass capacitor?
Yes - MC7809BTG requires a minimum 0.33 µF input bypass capacitor (tantalum, ceramic, or film) placed directly across Pins 1 and 2. This stabilizes operation under fast load transients and prevents oscillation when input wiring exceeds 10 cm from the bulk filter capacitor.
Can MC7809BTG be used in adjustable-output configurations?
Yes - MC7809BTG can be configured as an adjustable regulator using external resistors per Figure 10 in the datasheet. However, its internal feedback network is optimized for fixed 9 V output; adjustable use sacrifices accuracy, line/load regulation, and thermal performance unless carefully compensated.
What is the thermal resistance junction-to-case for MC7809BTG?
The thermal resistance junction-to-case (RJC) for MC7809BTG in the TO-220 package is 5.0°C/W, measured from die to the metal tab. This value enables accurate heatsink sizing when dissipating >1 W - e.g., at 1.0 A with 3 V dropout, 3 W dissipation requires a heatsink with ≤55°C/W total RJA to stay below 125°C junction limit.
Is MC7809BTG pin-compatible with other 78xx-series regulators?
Yes - MC7809BTG shares the standard 3-pin TO-220 pinout (Input/Ground/Output) with all 78xx-family devices, including MC7805, MC7812, and LM78xx variants. Mechanical and electrical pin compatibility allows direct substitution within the same voltage class when thermal and accuracy requirements align.
MC7809BTG 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):
- 8 mA
- Current - Supply (Max):
- -
- PSRR:
- 61dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
MC7809BTG FAQ
1.How can I place an order for MC7809BTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7809BTG 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 MC7809BTG reliable?
The price and inventory of MC7809BTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7809BTG is usually 5 days.
3.What payment methods are accepted for MC7809BTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7809BTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7809BTG?
MC7809BTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7809BTG 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 MC7809BTG?
For technical support, including MC7809BTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7809BTG requirements.
6.How does Aetrix verify that MC7809BTG is sourced from the original manufacturer or authorized distributors?
All MC7809BTG 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 MC7809BTG meets industry standards.
7.What is the process for return or replacement of MC7809BTG?
All MC7809BTG units undergo pre-shipment inspection (PSI). If there is an issue with MC7809BTG, 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 MC7809BTG part is unused and in its original packaging.
Return procedure for MC7809BTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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