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onsemi MC7808BDTRK
- Part No.:
- MC7808BDTRK
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC7808BDTRK.pdf
- Description:
- IC REG LINEAR 8V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,224
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Product details
Overview
MC7808BDTRK from onsemi is a fixed-output +8.0 V, 1.0 A linear voltage regulator in DPAK-3 surface-mount package, featuring internal thermal shutdown, short-circuit current limiting, safe-area compensation, and ±4% output voltage tolerance at 25°C. It operates with input voltages up to 35 V and delivers stable DC power for local regulation in industrial control, automotive subsystems, and embedded power rails.
For engineers reviewing the MC7808BDTRK datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, PCB layout guidance for heatsinking, and validated alternative parts for design continuity and supply chain resilience.
Technical Context
The MC7808BDTRK implements a monolithic NPN pass transistor architecture with built-in protection circuitry: thermal overload detection triggers shutdown above +150°C junction temperature, while short-circuit current limiting holds peak output at 0.2 A under 35 V input. Safe-area compensation dynamically reduces short-circuit current as VIN–VOUT increases, preventing second breakdown.
It requires no external components for basic operation but benefits from a 0.33 µF input bypass capacitor when placed >2 inches from bulk filter capacitance. Output stability is maintained without an output capacitor, though a ≥0.1 µF ceramic improves transient response-no ESR requirements apply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +8.0 V nominal, ±4% tolerance (7.68–8.32 V) across 5 mA–1.0 A load and 10.5–23 V input range |
| Output Current | 1.0 A continuous (with adequate heatsinking); peak current up to 2.2 A for short durations |
| Dropout Voltage | 2.0 V typical at 1.0 A and 25°C - mandates minimum 10.0 V input for stable 8.0 V output |
| Ripple Rejection | 62 dB typical at 120 Hz, 11.5–18 V input - suppresses AC ripple from unregulated supplies |
| Quiescent Current | 3.3 mA typical, ≤8.0 mA max - enables low-noise operation without significant standby loss |
| Thermal Shutdown | Activates at +150°C junction temperature - protects against sustained overloads or poor heatsinking |
| Short-Circuit Limit | 0.2 A typical at 35 V input - prevents destructive fault currents while allowing safe restart |
Pinout & Package
DPAK-3 (TO-252-3) surface-mount package with exposed thermal pad connected to Pin 2 (Ground). Requires solder thermal pad area ≥25 mm² and ≥2 thermal vias to inner ground plane for 1.0 A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input (10.5–35 V); connect 0.33 µF bypass capacitor directly between Pin 1 and Pin 2 |
| Pin 2 | Ground | Common reference for input and output; tied to exposed thermal pad - must be low-impedance ground plane |
| Pin 3 | Output | Regulated +8.0 V output; no mandatory output capacitor, but ≥0.1 µF ceramic improves load-step response |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +8.0 V output | Eliminates external resistor network - simplifies BOM and layout for dedicated 8 V rail generation |
| Internal thermal shutdown | Auto-recovery after cooldown - enables robust operation in sealed enclosures without fan control logic |
| Short-circuit current limiting | Clamps fault current to ≤0.2 A - avoids fuse replacement and allows automatic reset after fault clearance |
| No external capacitors required | Reduces component count and board space - suitable for cost-sensitive, high-volume consumer and industrial designs |
| Safe-area compensation | Prevents pass transistor destruction during output shorts at high input differentials - enhances field reliability |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated analog sensor interfaces and digital I/O drivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Local +8 V bias supply for op-amps, ADC references, and optocoupler LEDs. Use Value: Stable 8 V rail maintains 12-bit ADC accuracy despite 24 VDC field bus ripple; thermal shutdown prevents latch-up during wiring faults. |
Use Scenario: Supplying microcontroller peripherals and CAN transceiver bias in door module ECUs. IC Role / Device Role / Timing Role: Secondary regulated rail derived from vehicle battery (9–16 V), immune to cold-crank dips. Use Value: 2.0 V dropout enables operation down to 10 V input - sustains function during engine start; AEC-Q100 qualified variants available. |
| Point-of-Sale Terminal | Medical Patient Monitor Front-End |
Use Scenario: Providing clean +8 V for thermal print head drivers and display backlight ICs. IC Role / Device Role / Timing Role: Low-noise DC source decoupled from noisy switching power supply. Use Value: 62 dB ripple rejection attenuates 120 Hz switching artifacts - eliminates visible banding in thermal prints. |
Use Scenario: Biasing precision instrumentation amplifiers and analog front-end filters. IC Role / Device Role / Timing Role: Ultra-stable analog supply referenced to system ground, independent of digital noise. Use Value: ±4% tolerance and −0.4 mV/°C tempco ensure <±0.5% gain drift across 0–50°C operating range. |
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 | ±2% output tolerance (tighter), higher quiescent current (4.2–8.5 mA), TO-263-3 package only | Better initial accuracy for precision analog rails; larger thermal footprint than DPAK | Select when ±2% VO tolerance is required and PCB layout accommodates TO-263 thermal pad |
| NCV7808BDTRKG | AEC-Q100 Grade 1 qualified (−40°C to +125°C), same electrical specs and DPAK-3 package | Automotive-grade qualification with PPAP support - required for body electronics and chassis modules | Choose for automotive production where extended temperature range and process traceability are mandated |
Compared with MC7808BDTRK, LM7808CDT offers tighter output tolerance but requires more board area and dissipates more quiescent power, while NCV7808BDTRKG delivers identical performance with full automotive qualification - enabling drop-in use in safety-critical systems without redesign.
Availability
MC7808BDTRK is available at Aetrix Electronics and suitable for industrial automation, automotive subsystems, and medical device power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC7808BDTRK 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications - focused on enabling sustainable technology.
The MC7800 series was designed as a cost-optimized, thermally robust family of fixed-output linear regulators for local point-of-load regulation in space-constrained and thermally demanding environments.
FAQ
What is the maximum input voltage rating for MC7808BDTRK?
The absolute maximum input voltage for MC7808BDTRK is 35 V DC, as specified in the "Maximum Ratings" table of the onsemi datasheet. Operation above this level risks permanent damage due to junction breakdown. For reliable 1.0 A output, input should remain within 10.5–23 V per the "Electrical Characteristics" section to maintain regulation and thermal safety.
Does MC7808BDTRK require an output capacitor to remain stable?
No, MC7808BDTRK does not require an output capacitor for stability - its internal compensation ensures unconditional stability without external capacitance. However, adding ≥0.1 µF ceramic at the output significantly improves transient response to fast load steps, especially in microcontroller or motor driver applications where current demand changes rapidly.
Can MC7808BDTRK be used in automotive applications?
MC7808BDTRK itself is not AEC-Q100 qualified, but its pin-compatible variant NCV7808BDTRKG is fully qualified for automotive use (Grade 1: −40°C to +125°C). For non-safety-critical automotive subsystems (e.g., infotainment accessories), MC7808BDTRK may be used with derating; however, production automotive ECUs require the NCV prefix part for compliance and PPAP documentation.
How much heatsinking is needed for 1.0 A continuous output from MC7808BDTRK?
To sustain 1.0 A at 8 V output with 20 V input (12 V dropout → 12 W dissipation), MC7808BDTRK requires a thermal resistance from junction-to-ambient ≤30°C/W. With RθJA = 65°C/W for standard DPAK on 1 oz copper, this demands ≥25 mm² thermal pad area plus ≥2 thermal vias to an internal ground plane - or an external heatsink attached to the exposed pad via conductive epoxy or screw.
What is the typical dropout voltage of MC7808BDTRK at full load?
The typical dropout voltage of MC7808BDTRK is 2.0 V at 1.0 A load and 25°C junction temperature, meaning it maintains regulation as long as input voltage stays ≥10.0 V. This value increases slightly with temperature and load - at 125°C junction, dropout may reach 2.3 V - so designs must ensure worst-case input margin exceeds this threshold under all operating conditions.
MC7808BDTRK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- 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:
- DPAK
MC7808BDTRK FAQ
1.How can I place an order for MC7808BDTRK through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7808BDTRK 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 MC7808BDTRK reliable?
The price and inventory of MC7808BDTRK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7808BDTRK is usually 5 days.
3.What payment methods are accepted for MC7808BDTRK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7808BDTRK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7808BDTRK?
MC7808BDTRK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7808BDTRK 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 MC7808BDTRK?
For technical support, including MC7808BDTRK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7808BDTRK requirements.
6.How does Aetrix verify that MC7808BDTRK is sourced from the original manufacturer or authorized distributors?
All MC7808BDTRK 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 MC7808BDTRK meets industry standards.
7.What is the process for return or replacement of MC7808BDTRK?
All MC7808BDTRK units undergo pre-shipment inspection (PSI). If there is an issue with MC7808BDTRK, 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 MC7808BDTRK part is unused and in its original packaging.
Return procedure for MC7808BDTRK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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