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onsemi MC7808BTG
- Part No.:
- MC7808BTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
MC7808BTG.pdf
- Description:
- IC REG LINEAR 8V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,541
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Product details
Overview
MC7808BTG 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 output under 5.0 mA–1.0 A load, requires no external components for basic operation, and supports local on-card regulation in industrial power supplies and embedded control systems.
For engineers reviewing the MC7808BTG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (2.0 V at 1.0 A), ±3% output tolerance (7.7–8.3 V at 25°C), ripple rejection (62 dB at 120 Hz), thermal protection behavior, and compatibility with standard heatsinking via Pin 2 (Ground/Heatsink).
Technical Context
The MC7808BTG 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 overload. Its internal bandgap reference and error amplifier maintain regulation across input voltages from 10.5 V to 23 V (for 1.0 A load) and junction temperatures from −40°C to +150°C.
Thermal shutdown activates at +150°C junction temperature and latches off until cooldown; recovery is automatic. Quiescent current remains stable at 3.3 mA (typ) and changes less than ±0.5 mA over full input and load ranges, ensuring predictable bias consumption in battery-backed or low-power standby circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 7.7–8.3 V at 25°C (±3% tolerance); maintains 7.6–8.4 V over 5–1000 mA load and 10.5–23 V input |
| Maximum Output Current | 1.0 A continuous (with adequate heatsinking); peak 2.2 A for short durations |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C - defines minimum input headroom required for regulation |
| Ripple Rejection | 62 dB at 120 Hz, 11.5–18 V input - suppresses AC line noise before reaching sensitive analog/digital loads |
| Quiescent Current | 3.3 mA typical, ≤8.0 mA max - enables low-standby-power designs without compromising regulation stability |
| Thermal Shutdown Threshold | +150°C junction temperature - protects against sustained overload or inadequate heatsinking |
| Short-Circuit Current Limit | 0.2 A typical at 35 V input - limits fault energy and prevents PCB trace damage during output shorts |
Pinout & Package
MC7808BTG uses the industry-standard TO-220 package (Case 221AB), with the metal tab (heatsink surface) internally connected to Pin 2 (Ground). This configuration simplifies mechanical mounting and ensures low thermal resistance (RJC = 5.0°C/W) when bolted to a heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input supply; must exceed output by ≥2.0 V (e.g., ≥10 V for 8 V out) |
| Pin 2 | Ground / Heatsink | Common reference for input/output; metal tab is electrically tied to this pin - must be isolated if chassis ground is not system ground |
| Pin 3 | Output | Regulated +8.0 V DC output; bypass capacitor (≥0.33 µF) recommended at point-of-load for transient response |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables drop-in replacement in legacy 78xx-based designs without redesigning feedback or compensation networks |
| Internal thermal overload protection | Auto-recovery shutdown prevents permanent damage during sustained overtemperature events (e.g., blocked airflow, high ambient) |
| Safe-area compensated output transistor | Reduces short-circuit current as VCE rises - avoids destructive secondary breakdown during output faults |
| 1.5% to 4% output voltage tolerance options | MC7808BTG is B-grade (±3%), enabling cost-optimized designs where tighter tolerance isn't required |
| Pb-free and RoHS-compliant | Meets global environmental compliance requirements for industrial and consumer end equipment |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Powering microcontroller peripherals (ADCs, UARTs, GPIOs) in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Local +8 V rail generator providing clean, regulated supply independent of main 24 V bus fluctuations. Use Value: Maintains 7.6–8.4 V output across 10.5–23 V input range and 5–1000 mA load - eliminates need for additional filtering or supervision ICs. |
Use Scenario: Supplying sensor interface circuitry (e.g., Hall-effect position sensors, LIN transceivers) in door module ECUs. IC Role / Device Role / Timing Role: Fixed-voltage source for analog front-ends requiring stable bias under cold-crank (6.5 V) and load-dump (35 V) conditions. Use Value: Withstands 35 V input transients and shuts down safely at 150°C - meets AEC-Q100 stress requirements when paired with appropriate input clamping. |
| Point-of-Load Regulation in Telecom Equipment | Legacy Embedded Instrumentation |
|
Use Scenario: Generating auxiliary +8 V rails for op-amp signal conditioning stages in base station RF subsystems. IC Role / Device Role / Timing Role: Low-noise linear regulator replacing switching converters where EMI-sensitive analog paths exist. Use Value: 10 µV/V output noise (10 Hz–100 kHz) and 62 dB ripple rejection minimize interference in precision measurement chains. |
Use Scenario: Retrofitting aging test equipment (e.g., bench multimeters, function generators) originally designed for 7808 variants. IC Role / Device Role / Timing Role: Direct pin-compatible upgrade path for obsolete 7808 devices with improved thermal robustness and tighter initial tolerance. Use Value: Same TO-220 footprint and pinout as legacy 7808; B-grade tolerance (±3%) and 150°C shutdown improve field reliability vs. older C-grade parts. |
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 |
|---|---|---|---|
| LM7808CDT/NOPB (Texas Instruments) | Same TO-220 package, ±2% output tolerance (7.84–8.16 V), higher quiescent current (4.2–8.5 mA), lower ripple rejection (55 dB) | Suitable for cost-sensitive consumer applications where tighter initial accuracy matters more than noise or thermal margin | Select LM7808CDT/NOPB only if ±2% tolerance is mandatory and thermal derating margins are sufficient for the enclosure design |
| NCV7808BD2TR4G (onsemi) | D2PAK-3 surface-mount variant of same silicon; identical electrical specs but different thermal path (RJA = 65°C/W vs. 92°C/W for TO-220) | Required for automated SMT assembly; demands careful PCB copper pour design to match TO-220 heatsinking capability | Choose NCV7808BD2TR4G for new SMT designs needing automotive qualification (AEC-Q100 Grade 1); avoid direct substitution in through-hole layouts |
Compared with LM7808CDT/NOPB, MC7808BTG offers superior ripple rejection and lower quiescent current, making it preferable for noise-sensitive or thermally constrained applications; versus NCV7808BD2TR4G, it provides easier mechanical heatsinking and proven legacy compatibility but requires manual assembly.
Availability
MC7808BTG is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, telecom infrastructure, and legacy instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for MC7808BTG 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 supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC7800 series was engineered as a robust, drop-in compatible family of fixed-output linear regulators targeting cost-effective, high-reliability power management in harsh environments - emphasizing thermal resilience, fault containment, and long-lifecycle manufacturability.
FAQ
What is the minimum input voltage required for MC7808BTG to regulate at full 1.0 A load?
The MC7808BTG requires a minimum input voltage of 10.5 V DC to maintain regulation across the full 5.0 mA to 1.0 A load range, based on its 2.0 V dropout voltage specification at 1.0 A and 25°C. At higher junction temperatures or with marginal heatsinking, design margin should increase this to ≥11.5 V to ensure stability under worst-case conditions. The MC7808BTG datasheet specifies 10.5–23 V input range for 1.0 A operation.
Does MC7808BTG require input or output capacitors for stable operation?
MC7808BTG does not require output capacitance for stability, but a 0.33 µF or larger input bypass capacitor is recommended when the regulator is located more than a few inches from the main power supply filter - especially with long traces or high-impedance sources. This improves high-frequency noise immunity and transient response. The MC7808BTG data sheet explicitly states CO is optional but beneficial for transient performance.
How does thermal shutdown work in MC7808BTG, and does it auto-recover?
MC7808BTG incorporates an internal thermal shutdown circuit that disables the output pass transistor when junction temperature reaches +150°C. Once the die cools below the hysteresis threshold (~135°C), regulation automatically resumes without external intervention. This behavior is fully specified in the Absolute Maximum Ratings and Electrical Characteristics tables of the MC7808BTG datasheet and requires no external circuitry.
Can MC7808BTG be used in automotive applications?
Yes - the MC7808BTG is rated for operation from −40°C to +125°C ambient and features internal protection circuits essential for automotive environments. While the standard MC7808BTG is not AEC-Q100 qualified, its pinout, electrical specs, and ruggedized construction make it suitable for non-safety-critical body electronics (e.g., lighting controls, HVAC actuators) when combined with appropriate input transient protection. For certified applications, use the NCV7808BD2TR4G variant.
What is the output voltage tolerance of MC7808BTG over temperature and load?
MC7808BTG guarantees an output voltage of 7.6 V to 8.4 V across the full operating range: 5.0 mA to 1.0 A load, 10.5–23 V input, and junction temperature from −40°C to +125°C. At 25°C, the tighter tolerance is 7.7–8.3 V (±3%). Temperature coefficient is −0.4 mV/°C, meaning output drifts downward ~40 mV over a 100°C rise - well within the overall 0.8 V window.
MC7808BTG 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):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 8 mA
- Current - Supply (Max):
- -
- PSRR:
- 62dB (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
MC7808BTG FAQ
1.How can I place an order for MC7808BTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7808BTG 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 MC7808BTG reliable?
The price and inventory of MC7808BTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7808BTG is usually 5 days.
3.What payment methods are accepted for MC7808BTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7808BTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7808BTG?
MC7808BTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7808BTG 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 MC7808BTG?
For technical support, including MC7808BTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7808BTG requirements.
6.How does Aetrix verify that MC7808BTG is sourced from the original manufacturer or authorized distributors?
All MC7808BTG 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 MC7808BTG meets industry standards.
7.What is the process for return or replacement of MC7808BTG?
All MC7808BTG units undergo pre-shipment inspection (PSI). If there is an issue with MC7808BTG, 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 MC7808BTG part is unused and in its original packaging.
Return procedure for MC7808BTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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