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onsemi MC7808ACTG
- Part No.:
- MC7808ACTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC7808ACTG.pdf
- Description:
- IC REG LINEAR 8V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,367
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Product details
Overview
MC7808ACTG from onsemi is a fixed-output +8.0 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 DC power for local regulation in industrial control, automotive subsystems, and embedded power supplies where input ripple up to 120 Hz must be suppressed and dropout ≤2.0 V is required.
For engineers reviewing the MC7808ACTG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs (VO = 7.7–8.3 V @ 25°C, VI−VO ≤ 2.0 V, RR ≥ 62 dB), thermal performance (TJ max = +150°C), package mapping (TO-220, Pin 1=Input, Pin 2=GND, Pin 3=Output), and validated alternatives for design continuity.
Technical Context
The MC7808ACTG implements a monolithic series pass transistor architecture with built-in protection circuitry: thermal overload detection triggers automatic shutdown at +150°C junction temperature, while short-circuit current limiting holds output current ≤0.2 A under fault conditions. Safe-area compensation dynamically reduces short-circuit current as VIN−VOUT increases, preventing secondary breakdown.
It operates without external components for basic regulation but requires input bypassing (≥0.33 µF) when located >2 inches from bulk filter capacitance. Output stability is independent of CO, though ≥0.1 µF improves transient response. Ripple rejection is specified at 11.5–18 V input and 120 Hz, delivering ≥62 dB attenuation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 7.7–8.3 V at TJ = 25°C; maintains 7.6–8.4 V across 5 mA–1.0 A load and 10.5–23 V input range |
| Output Current | 1.0 A continuous (with heatsink); peak 2.2 A for short durations |
| Dropout Voltage | ≤2.0 V at IO = 1.0 A and TJ = 25°C - defines minimum VIN needed for regulation |
| Ripple Rejection | ≥62 dB at f = 120 Hz, VIN = 11.5–18 V - critical for AC/DC front-end noise suppression |
| Quiescent Current | 3.3–6.0 mA - low bias draw enables efficient standby operation |
| Thermal Shutdown | Activates at TJ ≥ +150°C - protects die during overload or inadequate heatsinking |
| Short-Circuit Limit | 0.2 A typical at VIN = 35 V - prevents catastrophic failure during output faults |
Pinout & Package
MC7808ACTG uses the industry-standard TO-220 package (Case 221AB), with metal tab electrically connected to Pin 2 (Ground). Heatsinking is mandatory for >500 mA continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input (10.5–23 V typical); must exceed VO by ≥2.0 V for regulation |
| Pin 2 | Ground | Common reference for input and output; metal tab is internally tied to this pin |
| Pin 3 | Output | Regulated +8.0 V DC; connects directly to load and local decoupling capacitors |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables drop-in replacement in legacy designs without redesigning feedback networks |
| Internal thermal overload protection | Auto-recovery after cooldown eliminates need for external thermal sensors or reset logic |
| Internal short-circuit current limiting | Clamps fault current to 0.2 A, allowing safe operation even with sustained output shorts |
| Safe-area compensated output transistor | Prevents second breakdown during high-VCE stress, enabling robust operation across wide VIN ranges |
| 1.5% output voltage tolerance option | MC7808ACTG is part of the 'A' grade family - tighter initial accuracy vs. standard 'C' grade (2%) or 'B' grade (4%) |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Powering microcontrollers, CAN transceivers, and analog sensor interfaces in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 8 V local regulator supplying isolated 3.3 V/5 V LDOs and digital logic rails. Use Value: 62 dB ripple rejection ensures clean supply for precision ADCs; thermal shutdown prevents field failures during ambient temperature excursions. |
Use Scenario: Regulating auxiliary 8 V rail for door module ECUs, mirror controls, and seat position sensors. IC Role / Device Role / Timing Role: Fixed-voltage post-regulator downstream of automotive-grade DC/DC converters. Use Value: AEC-Q100 qualified variants (NCV7808) exist; MC7808ACTG shares identical pinout and protection features for non-automotive BCU designs. |
| Point-of-Load Power for Legacy Equipment | Test & Measurement Instrumentation |
|
Use Scenario: Replacing aging 7808 regulators in OEM equipment requiring long-term component availability. IC Role / Device Role / Timing Role: Direct pin-compatible upgrade path for obsolete 7808 variants with enhanced thermal margin. Use Value: Same TO-220 footprint and electrical behavior as legacy parts; 150°C shutdown extends service life in convection-cooled enclosures. |
Use Scenario: Supplying low-noise analog front-ends in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Low-drift 8 V source for op-amp biasing and reference voltage generation stages. Use Value: −0.4 mV/°C tempco minimizes drift over operating temperature; 10 µV/V output noise preserves measurement resolution. |
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 |
|---|---|---|---|
| LM7808CD2T | Same 8 V output, 1.0 A rating, TO-263 (D2PAK) package; higher RJA (65°C/W vs. 92°C/W) due to surface-mount thermal path | Requires PCB rework for SMT assembly; unsuitable for through-hole legacy boards | Select LM7808CD2T only when migrating to surface-mount manufacturing and thermal management allows lower RJA |
| NCV7808BD2TR4G | Automotive-grade variant with AEC-Q100 qualification, same TO-220 package and pinout; tighter 2% output tolerance (vs. MC7808ACTG's 1.5%) | Qualified for under-hood environments (−40°C to +125°C ambient); higher cost and longer lead times | Choose NCV7808BD2TR4G for automotive production; MC7808ACTG remains optimal for industrial and commercial use cases |
Compared with LM7808CD2T and NCV7808BD2TR4G, MC7808ACTG offers the best balance of tight initial accuracy (1.5%), proven through-hole reliability, and cost-effective sourcing for non-automotive industrial applications - without requiring layout changes or thermal redesign.
Availability
MC7808ACTG is available at Aetrix Electronics and suitable for industrial control systems, test instrumentation, and legacy equipment refurbishment requiring stable component supply and long-term obsolescence mitigation.
Supply support for MC7808ACTG 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 regulator family for local power conditioning in harsh environments - emphasizing thermal resilience, fault tolerance, and long-lifecycle support.
FAQ
What is the maximum input voltage for MC7808ACTG?
The absolute maximum input voltage for MC7808ACTG is 35 V DC, per the datasheet's Maximum Ratings table. However, for reliable continuous operation at 1.0 A output, the recommended input range is 10.5–23 V DC to maintain adequate headroom and thermal margin. Exceeding 23 V significantly increases power dissipation and requires aggressive heatsinking.
Does MC7808ACTG require an input capacitor?
Yes - MC7808ACTG requires a minimum 0.33 µF input bypass capacitor (tantalum, ceramic, or film) placed directly across Pins 1 and 2 with shortest possible leads. This is mandatory when the regulator is located more than ~2 inches from the main filter capacitor to prevent oscillation and ensure stability under dynamic load conditions.
Is MC7808ACTG pin-compatible with older 7808 regulators?
Yes - MC7808ACTG uses the standard TO-220 package with identical pinout (Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output) and matches legacy 7808 devices in footprint, thermal interface, and electrical behavior. It is a direct replacement for obsolete or second-source 7808 variants in through-hole designs.
What is the thermal resistance of MC7808ACTG?
MC7808ACTG has a junction-to-ambient thermal resistance (RJA) of 92°C/W in free-air conditions (no heatsink) and a junction-to-case resistance (RJC) of 5.0°C/W. With a properly mounted 1.5°C/W heatsink, total thermal resistance drops to ~6.5°C/W, enabling 1.0 A continuous operation at ambient temperatures up to +60°C.
Can MC7808ACTG be used in adjustable configurations?
Yes - although optimized as a fixed 8 V regulator, MC7808ACTG can be configured as an adjustable regulator using external resistors per Figure 10 in the datasheet. However, doing so forfeits factory-trimmed accuracy and requires careful compensation; dedicated adjustable regulators like LM317 are preferred for variable-output designs.
MC7808ACTG 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):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 62dB (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
MC7808ACTG FAQ
1.How can I place an order for MC7808ACTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7808ACTG 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 MC7808ACTG reliable?
The price and inventory of MC7808ACTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7808ACTG is usually 5 days.
3.What payment methods are accepted for MC7808ACTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7808ACTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7808ACTG?
MC7808ACTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7808ACTG 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 MC7808ACTG?
For technical support, including MC7808ACTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7808ACTG requirements.
6.How does Aetrix verify that MC7808ACTG is sourced from the original manufacturer or authorized distributors?
All MC7808ACTG 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 MC7808ACTG meets industry standards.
7.What is the process for return or replacement of MC7808ACTG?
All MC7808ACTG units undergo pre-shipment inspection (PSI). If there is an issue with MC7808ACTG, 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 MC7808ACTG part is unused and in its original packaging.
Return procedure for MC7808ACTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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