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onsemi MC7808BD2TG
- Part No.:
- MC7808BD2TG
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7808BD2TG.pdf
- Description:
- IC REG LINEAR 8V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,542
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Product details
Overview
MC7808BD2TG from onsemi is a fixed-output linear voltage regulator delivering +8.0 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 MC7808BD2TG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, D2PAK-3 package details, thermal performance data, and validated alternative parts for design-in and supply continuity planning.
Technical Context
The MC7808BD2TG implements a monolithic series pass transistor architecture with built-in protection circuitry including foldback current limiting and junction temperature sensing that triggers thermal shutdown above +150°C. It operates without external components for basic regulation but supports adjustable output configurations via external resistors and transistors.
Its dropout voltage remains fixed at 2.0 V (at IO = 1.0 A, TJ = 25°C), requiring minimum input of 10.0 V for stable 8.0 V output under full load. Ripple rejection is 62 dB at 120 Hz with 11.5–18 V input, and output noise is specified at 10 µV/V over 10 Hz–100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +8.0 V nominal, ±0.3 V tolerance (7.7–8.3 V) at TJ = 25°C; maintains regulation across 5 mA–1.0 A load and 10.5–23 V input. |
| Maximum Output Current | 1.0 A continuous (with adequate heatsinking); peak current capability up to 2.2 A for transient loads. |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C - defines minimum headroom required between input and output for regulation. |
| Ripple Rejection | 62 dB at 120 Hz (11.5–18 V input) - suppresses AC ripple from unregulated DC sources like rectified mains. |
| Quiescent Current | 3.3 mA typical (max 8.0 mA) - low bias draw enables efficient operation in standby or low-power modes. |
| Thermal Shutdown Threshold | +150°C junction temperature - automatically disables output to prevent permanent damage during overload or poor heatsinking. |
| Short-Circuit Current Limit | 0.2 A typical (at VIN = 35 V) - limits fault current to protect PCB traces and upstream components. |
Pinout & Package
D2PAK-3 (TO-263-3) surface-mount package with exposed thermal pad connected to Pin 2 (Ground). Designed for high-power dissipation with low thermal resistance (RJC = 5.0°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Input | Unregulated DC input terminal; must exceed output by ≥2.0 V under all operating conditions. |
| 2 | Ground | Common reference for input, output, and internal circuitry; also serves as thermal path to heatsink. |
| 3 | Output | Stable +8.0 V regulated output; requires no output capacitor for stability but benefits from 0.1–1.0 µF for transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +8.0 V output | Eliminates need for external feedback resistors - simplifies BOM and layout for standard 8 V rail generation. |
| Internal thermal shutdown | Prevents catastrophic failure during sustained overload or inadequate heatsinking - enables self-protecting power stage. |
| Short-circuit current limiting | Clamps fault current to ~0.2 A - avoids fuse blowing or trace melting while allowing safe recovery after fault removal. |
| Safe-area compensated pass transistor | Reduces short-circuit current as VCE increases - improves reliability under partial short or capacitive load inrush. |
| Pb-free and RoHS-compliant | Meets global environmental compliance requirements for industrial and automotive applications. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Provides clean +8 V bias for microcontroller peripherals, CAN transceivers, and sensor interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Primary local regulator for 8 V logic and analog subsystems, referenced to common ground with input filter. Use Value: Maintains regulation across wide input range (10.5–23 V) and load steps (5 mA–1.0 A), ensuring consistent MCU core voltage despite bus fluctuations. |
Use Scenario: Supplies +8 V to door module actuators, window lift drivers, and interior lighting controllers in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Fixed-voltage post-regulator downstream of buck converter or alternator rectifier. Use Value: Withstands load dump transients up to 35 V input and delivers stable 8 V output even during cold-crank (6.5 V battery dip) when paired with sufficient hold-up capacitance. |
| Embedded Motor Drive Interface | Test Equipment Signal Conditioning |
Use Scenario: Powers gate driver ICs and op-amps in low-voltage (<12 V) brushed DC motor control boards. IC Role / Device Role / Timing Role: Local regulation stage isolating sensitive analog/digital circuitry from noisy motor current paths. Use Value: 62 dB ripple rejection suppresses PWM-induced noise from adjacent H-bridge stages, preserving signal integrity in feedback loops. |
Use Scenario: Generates precision +8 V reference for ADC front-ends, DAC buffers, and calibration circuits in benchtop instruments. IC Role / Device Role / Timing Role: Low-noise, fixed-output supply for analog signal chain biasing. Use Value: 10 µV/V output noise and <±0.4 mV/°C tempco ensure minimal drift and quantization error in 16-bit+ measurement systems. |
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 |
|---|---|---|---|
| MC7808CD2TG | Same D2PAK-3 package and +8 V output, but C-grade (0°C to +125°C) vs. B-grade (−40°C to +125°C) temperature range; tighter initial tolerance not specified. | Suitable for commercial/industrial environments without extended cold-start requirement. | Select MC7808CD2TG only if ambient operating temperature stays above 0°C and automotive qualification is unnecessary. |
| NCV7808BD2TR4G | AEC-Q100 qualified, automotive-grade variant with same electrical specs and D2PAK-3 package; includes PPAP support and enhanced ESD robustness (2 kV HBM). | Required for body electronics, infotainment, and ADAS modules where automotive reliability standards apply. | Choose NCV7808BD2TR4G for automotive designs needing certified qualification, traceability, and extended life-cycle support. |
Compared with MC7808CD2TG, the MC7808BD2TG offers guaranteed −40°C startup capability and tighter output voltage tolerance over temperature, making it preferable for harsh-environment industrial use; versus NCV7808BD2TR4G, it lacks automotive qualification documentation but matches all electrical and thermal performance metrics for non-automotive applications.
Availability
MC7808BD2TG is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded motor control applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MC7808BD2TG 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 (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC7800 series was designed as a cost-effective, rugged fixed-output linear regulator family for local point-of-load regulation in space-constrained, thermally demanding applications - emphasizing reliability over programmability.
FAQ
What is the minimum input voltage required for MC7808BD2TG to maintain regulation?
The MC7808BD2TG requires a minimum input voltage of 10.5 V under full 1.0 A load to sustain +8.0 V output, based on its 2.0 V dropout specification at 25°C. At higher junction temperatures or lighter loads, input can be reduced slightly, but design margin should retain ≥2.5 V headroom for stability across temperature and line variations.
Does MC7808BD2TG require an input bypass capacitor?
Yes - an input bypass capacitor (≥0.33 µF tantalum or ceramic) is recommended for MC7808BD2TG when connected via >2 inch traces to the main supply filter. This prevents oscillation and improves high-frequency noise immunity, especially under dynamic load changes. Mount it directly across Pins 1 and 2 with shortest possible leads.
Can MC7808BD2TG be used in adjustable output configurations?
Yes - the MC7808BD2TG can be configured as an adjustable regulator using external resistors and a pass transistor (per Figure 10 in the datasheet), though its internal feedback network is optimized for fixed +8 V operation. For dedicated adjustable designs, consider the LM317 or onsemi's NCV317 series instead.
What is the thermal resistance junction-to-case (RJC) for MC7808BD2TG?
The MC7808BD2TG has a junction-to-case thermal resistance (RJC) of 5.0°C/W, measured from die to the exposed thermal pad (Pin 2). Effective heatsinking requires low-thermal-resistance interface material and a copper area ≥1000 mm² per watt dissipated to maintain safe junction temperature below +150°C.
Is MC7808BD2TG pin-compatible with other MC7800-series regulators in D2PAK-3?
Yes - all MC78xxxD2TG variants (e.g., MC7805BD2TG, MC7812BD2TG) share identical D2PAK-3 pinout (Pin 1: Input, Pin 2: Ground, Pin 3: Output), enabling drop-in replacement across output voltages when board layout accommodates different input/output voltage margins and thermal requirements.
MC7808BD2TG 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):
- 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:
- Surface Mount
- Supplier Device Package:
- D2PAK-3
MC7808BD2TG FAQ
1.How can I place an order for MC7808BD2TG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7808BD2TG 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 MC7808BD2TG reliable?
The price and inventory of MC7808BD2TG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7808BD2TG is usually 5 days.
3.What payment methods are accepted for MC7808BD2TG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7808BD2TG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7808BD2TG?
MC7808BD2TG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7808BD2TG 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 MC7808BD2TG?
For technical support, including MC7808BD2TG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7808BD2TG requirements.
6.How does Aetrix verify that MC7808BD2TG is sourced from the original manufacturer or authorized distributors?
All MC7808BD2TG 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 MC7808BD2TG meets industry standards.
7.What is the process for return or replacement of MC7808BD2TG?
All MC7808BD2TG units undergo pre-shipment inspection (PSI). If there is an issue with MC7808BD2TG, 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 MC7808BD2TG part is unused and in its original packaging.
Return procedure for MC7808BD2TG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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