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onsemi MC7808CDTG
- Part No.:
- MC7808CDTG
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC7808CDTG.pdf
- Description:
- IC REG LINEAR 8V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,143
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Product details
Overview
MC7808CDTG 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, and safe-area compensation. It delivers stable output with ±4% tolerance at 25°C, supports input voltages up to 35 V, and is widely used for local regulation in industrial power supplies and embedded control modules.
For engineers reviewing the MC7808CDTG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, package dimensions, real-world use cases, and validated alternative parts - all aligned with onsemi's MC7800/D Rev. 29 datasheet (November 2021).
Technical Context
The MC7808CDTG implements a monolithic series-pass transistor architecture with built-in protection circuitry: thermal overload detection triggers shutdown above +150°C junction temperature, while short-circuit current limiting caps output at ~0.2 A under 35 V input. Safe-area compensation dynamically reduces short-circuit current as VCE increases, preventing second breakdown.
It operates without external components for basic regulation but requires ≥0.33 µF input bypass capacitor when located >2 inches from bulk filter. Ripple rejection is 62 dB at 120 Hz (11.5–18 VIN, 500 mA), and dropout voltage remains ≤2.0 V at 1.0 A load and 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +8.0 V nominal, ±4% tolerance at 25°C - ensures compatibility with 8 V logic rails and analog subsystems requiring stable mid-rail bias. |
| Output Current | 1.0 A continuous (with heatsinking), 2.2 A peak - supports moderate-power microcontrollers, sensors, and interface ICs without external current boosting. |
| Input Voltage Range | 10.5–23 V DC for full spec compliance; absolute max 35 V - accommodates 12 V automotive and industrial bus inputs with ripple margin. |
| Dropout Voltage | ≤2.0 V at 1.0 A and 25°C - enables operation with only 10 V input for reliable 8 V output under worst-case load/temperature conditions. |
| Ripple Rejection | 62 dB at 120 Hz (11.5–18 VIN, 500 mA) - suppresses line-frequency noise from unregulated AC/DC supplies feeding downstream analog circuits. |
| Quiescent Current | 3.3–8.0 mA - low standby draw suitable for always-on industrial monitoring nodes where efficiency matters below full load. |
| Thermal Shutdown | Activates at +150°C junction temperature - protects against sustained overload or inadequate PCB copper area without external thermal management. |
Pinout & Package
DPAK-3 (TO-252-3) package with exposed thermal pad connected to Pin 2 (Ground); standard footprint compatible with automated SMT assembly and moderate-power thermal dissipation (RJA = 65°C/W, RJC = 5.0°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated DC input supply connection | Accepts 10.5–23 V input; must be bypassed with ≥0.33 µF capacitor near pin to ensure stability under dynamic loads. |
| 2 (Ground) | Common reference for input, output, and internal circuitry | Internally tied to exposed thermal pad; requires low-impedance PCB ground plane for thermal and noise performance. |
| 3 (Output) | Regulated +8.0 V output | Delivers up to 1.0 A; output capacitance not required for stability but improves transient response (e.g., 0.1–1 µF ceramic). |
Key Features
| Feature | Design Value |
|---|---|
| No external components needed | Enables minimal BOM count and compact layout for point-of-load regulation in space-constrained industrial PCBs. |
| Internal short-circuit current limit | Clamps fault current to ~0.2 A at 35 V input - prevents catastrophic failure during wiring errors or downstream shorts. |
| Thermal overload protection | Auto-recovery shutdown at +150°C junction - eliminates need for discrete thermal sensors or reset circuitry in sealed enclosures. |
| Safe-area compensated pass transistor | Reduces short-circuit current as VCE rises - avoids secondary breakdown during high-VIN/low-VOUT fault conditions. |
| Pb-free and RoHS-compliant | Meets global environmental compliance requirements for industrial and automotive applications without lead-free soldering constraints. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated digital input buffers and relay drivers in modular PLC backplanes with 12–24 V DC field bus. IC Role / Device Role / Timing Role: Local +8 V rail generator for optocoupler biasing and level-shifting logic, decoupled from noisy main 24 V supply. Use Value: Eliminates need for isolated DC/DC converters; thermal shutdown prevents latch-up during field-wiring faults. |
Use Scenario: Supplying +8 V to window lift motor controllers and door lock actuators in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Regulated auxiliary rail for H-bridge gate drivers and position sensor interfaces requiring stable mid-bus voltage. Use Value: Withstands load dump transients up to 35 V input; short-circuit limiting protects against jammed motor stalls. |
| Medical Patient Monitor Front-End | Point-of-Sale Terminal Power Management |
Use Scenario: Providing clean +8 V bias to analog front-end amplifiers and ADC reference circuits in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise local regulator for signal chain sub-systems, minimizing PSRR-induced measurement drift. Use Value: 62 dB ripple rejection at 120 Hz suppresses switching noise from shared SMPS; 10 µV/V output noise preserves SNR. |
Use Scenario: Powering barcode scanner laser diodes and EMV contactless reader ICs in retail terminals with 12 V wall adapters. IC Role / Device Role / Timing Role: Dedicated 8 V rail for high-current pulsed peripherals, isolated from main 5 V logic domain. Use Value: 2.2 A peak current supports laser pulse bursts; thermal shutdown prevents overheating during extended scanning sessions. |
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 (TI) | Same +8 V output, 1.0 A rating, TO-252 package; ±2% initial tolerance vs. MC7808CDTG's ±4%; higher quiescent current (4.5–8.5 mA). | Better initial accuracy suits precision analog biasing; slightly lower ripple rejection (55 dB @ 120 Hz) limits use in high-PSRR designs. | Select when tighter output tolerance is critical and thermal margin allows higher IQ; verify layout compatibility with TI's thermal pad design. |
| NCV7808BDTRKG (onsemi) | Automotive-grade variant: AEC-Q100 qualified, wider temp range (−40°C to +150°C), same ±4% tolerance and 1.0 A rating. | Required for under-hood or dashboard applications; identical pinout and electrical behavior - drop-in replacement where qualification is mandated. | Choose for automotive production; no redesign needed beyond documentation and PPAP compliance - same DPAK-3 footprint and thermal profile. |
Compared with LM7808CDT/NOPB, MC7808CDTG offers lower quiescent current and better ripple rejection but looser initial tolerance; versus NCV7808BDTRKG, it lacks AEC-Q100 certification but costs less for non-automotive industrial use.
Availability
MC7808CDTG is available at Aetrix Electronics and suitable for industrial PLCs, automotive body electronics, medical diagnostics equipment, and point-of-sale terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC7808CDTG 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 supplier specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The MC7800 series was designed as cost-effective, robust fixed-voltage regulators for local on-card regulation in harsh environments - emphasizing reliability, integrated protection, and ease of use over programmability or ultra-low dropout.
FAQ
What is the maximum input voltage rating for MC7808CDTG?
The MC7808CDTG has an absolute maximum input voltage of 35 V DC, as specified in the "Maximum Ratings" table of the onsemi MC7800/D datasheet (Rev. 29). For guaranteed performance across temperature and load, the recommended operating input range is 10.5–23 V DC. Exceeding 35 V risks permanent damage even with brief transients.
Does MC7808CDTG require an input bypass capacitor?
Yes - MC7808CDTG requires a minimum 0.33 µF input bypass capacitor (tantalum, ceramic, or mylar) placed directly across Pins 1 and 2, especially when located more than 2 inches from the bulk filter. This prevents oscillation and ensures stability under fast load transients, per Section 4 ("Applications Information") of the official datasheet.
What is the thermal resistance (RJA) of MC7808CDTG in its DPAK-3 package?
The MC7808CDTG in DPAK-3 (DT suffix, Case 369C) has a typical junction-to-ambient thermal resistance (RJA) of 65°C/W when mounted on a 1-inch² 2-oz copper pad with two thermal vias, as stated in the "Maximum Ratings" table on page 1 of the MC7800/D datasheet. Actual RJA depends heavily on PCB layout and copper area.
Can MC7808CDTG be used in adjustable-voltage configurations?
Yes - although optimized as a fixed +8 V regulator, MC7808CDTG can be configured as an adjustable regulator using external resistors and a Zener diode, as shown in Figure 10 of the datasheet. However, output accuracy, line/load regulation, and thermal performance degrade compared to its native fixed-output mode.
Is MC7808CDTG pin-compatible with other MC7800-series regulators?
Yes - all MC7800-series regulators (e.g., MC7805CDTG, MC7812CDTG) share identical DPAK-3 pinout (Pin 1: Input, Pin 2: Ground, Pin 3: Output) and mechanical footprint. This enables board-level voltage rail flexibility during prototyping or revision without layout changes, provided input/output capacitors and thermal design accommodate the new voltage/current requirements.
MC7808CDTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- 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):
- 8 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:
- Surface Mount
- Supplier Device Package:
- DPAK
MC7808CDTG FAQ
1.How can I place an order for MC7808CDTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7808CDTG 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 MC7808CDTG reliable?
The price and inventory of MC7808CDTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7808CDTG is usually 5 days.
3.What payment methods are accepted for MC7808CDTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7808CDTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7808CDTG?
MC7808CDTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7808CDTG 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 MC7808CDTG?
For technical support, including MC7808CDTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7808CDTG requirements.
6.How does Aetrix verify that MC7808CDTG is sourced from the original manufacturer or authorized distributors?
All MC7808CDTG 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 MC7808CDTG meets industry standards.
7.What is the process for return or replacement of MC7808CDTG?
All MC7808CDTG units undergo pre-shipment inspection (PSI). If there is an issue with MC7808CDTG, 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 MC7808CDTG part is unused and in its original packaging.
Return procedure for MC7808CDTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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