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onsemi MC7808BD2TR4G
- Part No.:
- MC7808BD2TR4G
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
MC7808BD2TR4G.pdf
- Description:
- IC REG LINEAR 8V 1A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,452
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Product details
Overview
MC7808BD2TR4G from onsemi is a fixed-output linear voltage regulator delivering 8.0 V ±3% 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 MC7808BD2TR4G datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, D2PAK-3 package details, thermal performance data, and validated alternative parts for drop-in or design-flexible replacement in fixed-voltage DC/DC conversion stages.
Technical Context
The MC7808BD2TR4G implements a monolithic series pass transistor architecture with integrated protection circuitry - including foldback current limiting that reduces output current under high VIN–VOUT differential, and thermal shutdown triggered at +150°C junction temperature. It requires no external components for basic operation but benefits from input bypassing (≥0.33 µF) when located remotely from bulk capacitance.
Its dropout voltage remains fixed at 2.0 V (at IO = 1.0 A, TJ = 25°C), enabling stable regulation with input as low as 10.0 V. Ripple rejection is 62 dB (120 Hz, VIN = 11.5–18 V), and output noise is 10 µV/V over 10 Hz–100 kHz - confirming suitability for analog-sensitive subsystems requiring clean, fixed 8 V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.0 V ±3% (7.7–8.3 V at TJ = 25°C); maintains regulation across 5–1000 mA load and 10.5–23 V input range |
| Maximum Output Current | 1.0 A continuous (with adequate heatsinking); peak current up to 2.2 A for transient loads |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C; defines minimum headroom needed between input and output |
| Ripple Rejection | 62 dB at 120 Hz (11.5–18 V input); suppresses AC line ripple without external filtering |
| Quiescent Current | 3.3–8.0 mA typical; low standby draw supports energy-conscious designs |
| Thermal Shutdown Threshold | +150°C junction temperature; self-protects during overload or poor heatsink conditions |
| Short-Circuit Current Limit | 0.2 A typical (VIN = 35 V); prevents destructive fault currents while maintaining latch-free recovery |
Pinout & Package
D2PAK-3 (TO-263-3) surface-mount package with exposed metal tab thermally and electrically connected to Pin 2 (Ground). Optimized for high-power dissipation in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input (VIN) | Unregulated DC input supply; must exceed 10.5 V for full-load 8 V output |
| Pin 2 | Ground (GND) | Common reference for input and output; tab connection enables direct heatsink mounting |
| Pin 3 | Output (VOUT) | Regulated 8.0 V supply; requires no output capacitor for stability but benefits from 0.1–1 µF for transient response |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 8 V output with ±3% tolerance | Eliminates external resistor network; ensures consistent rail voltage across production units |
| Internal thermal shutdown | Automatically disables output above +150°C junction temperature, preventing permanent damage |
| Safe-area compensated pass transistor | Reduces short-circuit current as VIN–VOUT increases - enhancing reliability under fault conditions |
| No external components required | Enables minimal BOM count and simplified layout for point-of-load regulation |
| Pb-free and RoHS-compliant | Meets environmental compliance requirements for industrial and automotive applications |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Provides stable 8 V rail to microcontroller peripherals and sensor interfaces in programmable logic controllers operating in 0–70°C ambient. IC Role / Device Role / Timing Role: Primary local regulator converting 12–24 V vehicle or field bus input to clean 8 V for ADC references and I/O drivers. Use Value: Maintains 8.0 V ±3% across 10.5–23 V input transients and 5–1000 mA load steps - ensuring consistent analog measurement accuracy. |
Use Scenario: Powers CAN transceiver bias and window lift motor control logic in body electronics modules. IC Role / Device Role / Timing Role: Fixed-voltage LDO substitute for legacy 8 V systems where low-cost, proven reliability outweighs ultra-low quiescent current needs. Use Value: Withstands load dump pulses up to 35 V input and delivers 1.0 A peak current during motor startup surges. |
| Embedded Motor Drive Auxiliary Rail | Test Equipment Bench Power |
|
Use Scenario: Generates isolated 8 V supply for gate driver ICs and op-amps in 24 V DC motor inverters. IC Role / Device Role / Timing Role: Local regulation stage decoupled from main SMPS; rejects switching noise via 62 dB ripple rejection. Use Value: Delivers low-noise 10 µV/V output enabling precise current sensing and PWM timing reference stability. |
Use Scenario: Used in modular bench power supplies to add a fixed 8 V output channel alongside adjustable outputs. IC Role / Device Role / Timing Role: Plug-and-play fixed-voltage module replacing discrete transistor-based regulators in lab-grade equipment. Use Value: Simplifies design with guaranteed 8.0 V ±3% accuracy and built-in short-circuit protection - reducing test fixture failure risk. |
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, but TO-263-3 package with ±5% tolerance (vs. ±3% for MC7808BD2TR4G); lower ripple rejection (55 dB) | Acceptable where tighter output tolerance and higher noise immunity are not required | Select LM7808CD2T only if cost sensitivity outweighs need for precision and noise performance |
| NCV7808BD2TR4G | Automotive-grade variant with AEC-Q100 qualification, identical electrical specs and D2PAK-3 footprint | Required for automotive body electronics, infotainment, and ADAS subsystems needing PPAP documentation | Choose NCV7808BD2TR4G when automotive qualification, extended temperature range (−40°C to +150°C), or traceability are mandatory |
Compared with LM7808CD2T, MC7808BD2TR4G offers tighter output tolerance and superior ripple rejection - critical for analog signal chains; versus NCV7808BD2TR4G, it lacks automotive qualification but provides identical performance at lower cost for industrial use.
Availability
MC7808BD2TR4G is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, and embedded motor drive auxiliary rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MC7808BD2TR4G 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 linear regulator family for local regulation in harsh environments - emphasizing thermal resilience, fault protection, and ease of use over ultra-low IQ or wide-input flexibility.
FAQ
What is the maximum input voltage rating for MC7808BD2TR4G?
The absolute maximum input voltage for MC7808BD2TR4G is 35 V DC, as specified in the Absolute Maximum Ratings table. Operation above 23 V is permissible only at reduced output current to maintain safe junction temperature - sustained use above 35 V will cause irreversible device damage.
Does MC7808BD2TR4G require an input bypass capacitor?
Yes - MC7808BD2TR4G requires a minimum 0.33 µF input bypass capacitor (tantalum, ceramic, or film) placed directly across Pins 1 and 2. This stabilizes operation under high-frequency noise and long-trace conditions; omission risks oscillation or erratic regulation, especially with >10 cm input traces.
Can MC7808BD2TR4G be used in adjustable-output configurations?
Yes - MC7808BD2TR4G can be configured as an adjustable regulator using external resistors per Figure 10 in the datasheet, though its internal 8 V reference limits practical adjustment range. For true wide-range adjustability, dedicated adjustable regulators like LM317 are preferred.
What is the thermal resistance (RθJC) of MC7808BD2TR4G in D2PAK-3 package?
The junction-to-case thermal resistance (RθJC) of MC7808BD2TR4G is 5.0°C/W, measured from die to the exposed metal tab (Pin 2). Effective heatsinking requires low-thermal-resistance interface (e.g., thermal pad or paste) between tab and heatsink to sustain 1.0 A continuous output.
Is MC7808BD2TR4G pin-compatible with other MC7800-series regulators?
Yes - all MC7800-series regulators in D2PAK-3 (D2T suffix) share identical pinout (Pin 1: IN, Pin 2: GND, Pin 3: OUT) and footprint. Substituting MC7805BD2TR4G or MC7812BD2TR4G requires only changing the input/output voltage constraints - no PCB redesign is needed.
MC7808BD2TR4G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- 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
MC7808BD2TR4G FAQ
1.How can I place an order for MC7808BD2TR4G through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7808BD2TR4G 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 MC7808BD2TR4G reliable?
The price and inventory of MC7808BD2TR4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7808BD2TR4G is usually 5 days.
3.What payment methods are accepted for MC7808BD2TR4G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7808BD2TR4G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7808BD2TR4G?
MC7808BD2TR4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7808BD2TR4G 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 MC7808BD2TR4G?
For technical support, including MC7808BD2TR4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7808BD2TR4G requirements.
6.How does Aetrix verify that MC7808BD2TR4G is sourced from the original manufacturer or authorized distributors?
All MC7808BD2TR4G 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 MC7808BD2TR4G meets industry standards.
7.What is the process for return or replacement of MC7808BD2TR4G?
All MC7808BD2TR4G units undergo pre-shipment inspection (PSI). If there is an issue with MC7808BD2TR4G, 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 MC7808BD2TR4G part is unused and in its original packaging.
Return procedure for MC7808BD2TR4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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