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onsemi MC7808CDT
- Part No.:
- MC7808CDT
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
MC7808CDT.pdf
- Description:
- IC REG LINEAR 8V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,076
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Product details
Overview
MC7808CDT 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 DC power for local regulation in industrial control, automotive subsystems, and embedded power rails where input ripple up to 120 Hz must be suppressed.
For engineers reviewing the MC7808CDT datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (2.0 V at 1.0 A), output voltage tolerance (±4% over temperature and load), ripple rejection (62 dB at 120 Hz), and thermal resistance (RθJC = 5.0 °C/W) - all critical for thermally constrained PCB layouts and noise-sensitive analog subsystems.
Technical Context
The MC7808CDT implements a monolithic series pass transistor architecture with built-in protection circuitry: thermal overload detection triggers shutdown before junction temperature exceeds +150°C, while short-circuit current limiting holds peak output current to 0.2 A under fault conditions. Safe-area compensation dynamically reduces short-circuit current as VIN–VOUT increases, preventing secondary breakdown of the output transistor.
It operates without external components for basic regulation but requires input bypassing (≥0.33 µF) when located >2 cm from bulk filter capacitance. Output capacitance is not required for stability but improves transient response - values below 0.1 µF may cause instability per datasheet guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +8.0 V nominal, ±4% tolerance over full load (5 mA–1.0 A), line (11.5–23 V), and temperature (0°C to +125°C) 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 at 1.0 A and +25°C - defines minimum input headroom needed to maintain regulation |
| Ripple Rejection | 62 dB at 120 Hz, 11.5–18 VIN, 500 mA load - critical for suppressing rectified AC ripple in offline supplies |
| Quiescent Current | 3.3 mA typical, ≤8.0 mA max - determines no-load power loss in always-on systems |
| Thermal Resistance | RθJC = 5.0 °C/W - enables precise junction temperature estimation from case temperature measurement |
| Protection Features | Internal thermal shutdown, short-circuit current limit (0.2 A), and safe-area compensated pass transistor |
Pinout & Package
MC7808CDT uses the DPAK-3 (TO-252-3) surface-mount package (Case 369C), with exposed thermal pad electrically connected to Pin 2 (Ground). The package supports high-power dissipation via PCB copper area and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input; must remain ≥10.5 V (min) and ≤35 V (abs max) to sustain +8.0 V output |
| Pin 2 | Ground | Common reference for input and output; also connects to exposed thermal pad for heatsinking |
| Pin 3 | Output | Regulated +8.0 V output; requires low-ESR bypass capacitor if load transients exceed 100 mA/µs |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Enables compact, low-BOM-cost power solutions - only input/output capacitors needed for most applications |
| Internal thermal overload protection | Automatically disables output when TJ reaches +150°C, preventing permanent damage during sustained overload |
| Safe-area compensated output transistor | Prevents second breakdown by reducing short-circuit current as VCE rises - enhances reliability under fault conditions |
| 1.5% to 4% output voltage tolerance options | MC7808CDT specifies ±4% - suitable for non-critical digital logic rails where tight regulation is not required |
| Pb-free and RoHS-compliant | Meets environmental compliance requirements for industrial and automotive end equipment |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering isolated 24 V-to-8 V local rails for digital input conditioning circuits and optocoupler drivers in programmable logic controllers. IC Role / Device Role / Timing Role: Primary +8 V local regulator supplying logic-level interface circuitry and microcontroller peripherals. Use Value: Delivers stable 8 V at up to 1.0 A with 62 dB ripple rejection - suppresses conducted noise from shared 24 V bus and ensures reliable optocoupler switching. | Use Scenario: Providing regulated +8 V for interior lighting control ICs, window lift motor drivers, and door module microcontrollers. IC Role / Device Role / Timing Role: Fixed-voltage supply rail generator with integrated fault protection for automotive sub-systems. Use Value: Thermal shutdown and short-circuit limiting meet AEC-Q100 stress requirements; DPAK package supports reflow-compatible assembly in high-volume automotive production. |
| Embedded Sensor Signal Conditioning | Legacy Industrial Instrumentation |
Use Scenario: Powering precision op-amps, ADC references, and analog front-end circuitry in temperature/pressure sensor nodes. IC Role / Device Role / Timing Role: Low-noise local regulator supplying analog signal chain components requiring clean DC bias. Use Value: 10 µV/V output noise and <1.0 mΩ output impedance minimize added noise and load-induced voltage droop in sensitive analog stages. | Use Scenario: Replacing aging 7808 variants in legacy panel meters, data loggers, and process controllers requiring long-term component availability. IC Role / Device Role / Timing Role: Drop-in compatible fixed-voltage regulator supporting backward-compatible board designs. Use Value: Pinout and electrical behavior match industry-standard 78xx family - enables direct replacement without layout changes or firmware updates. |
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 | Same pinout and function; ±2% output tolerance (tighter than MC7808CDT's ±4%), higher quiescent current (4.5–8.0 mA) | Better regulation accuracy suits precision analog rails; higher IQ increases no-load power loss | Select LM7808CDT when tighter output voltage stability is required and thermal margin allows higher IQ. |
| NCV7808BDT | Automotive-grade variant (AEC-Q100 qualified); ±2% tolerance; same RθJC = 5.0 °C/W; enhanced ESD rating (HBM 2000 V) | Required for automotive body electronics; wider operating temperature range (−40°C to +150°C junction) | Choose NCV7808BDT for automotive OEM or Tier-1 applications needing PPAP documentation and extended temperature support. |
Compared with LM7808CDT and NCV7808BDT, the MC7808CDT offers broader tolerance (±4%) and lower quiescent current (≤8.0 mA), making it optimal for cost-sensitive industrial and commercial applications where absolute voltage accuracy is secondary to thermal efficiency and BOM simplicity.
Availability
MC7808CDT is available at Aetrix Electronics and suitable for industrial control systems, automotive subsystems, and embedded instrumentation requiring stable component supply with consistent parametric performance across manufacturing lots.
Supply support for MC7808CDT 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 robust, drop-in compatible family of fixed-output linear regulators targeting cost-effective, thermally resilient local power delivery in harsh environments - emphasizing protection, manufacturability, and long-term supply stability.
FAQ
What is the maximum input voltage rating for the MC7808CDT?
The MC7808CDT has an absolute maximum input voltage of 35 VDC. Operation above this level risks permanent damage. For reliable regulation, input must remain between 10.5 V and 23 V under full 1.0 A load per datasheet specifications. Exceeding 35 V violates the Absolute Maximum Ratings table and voids functional guarantees for MC7808CDT.
Does the MC7808CDT require an input bypass capacitor?
Yes - the MC7808CDT requires a minimum 0.33 µF input bypass capacitor (tantalum, mylar, or low-ESR ceramic) mounted directly across Pins 1 and 2. This is mandatory when the regulator is located more than ~2 cm from the main filter capacitor, as specified in the Applications Information section of the MC7808CDT datasheet, to ensure stability under dynamic load conditions.
Can the MC7808CDT be used in automotive applications?
The standard MC7808CDT is not AEC-Q100 qualified and lacks automotive-specific validation. For automotive use, select the NCV7808BDT - the automotive-grade variant of the same device family - which meets AEC-Q100 Grade 1 requirements (−40°C to +125°C ambient), includes PPAP support, and features enhanced ESD robustness. MC7808CDT is intended for commercial/industrial applications only.
What is the thermal resistance from junction to case (RθJC) for the MC7808CDT?
The MC7808CDT has a junction-to-case thermal resistance (RθJC) of 5.0 °C/W, as specified in the Maximum Ratings table. This value assumes proper soldering of the exposed thermal pad (Pin 2) to a minimum 1-inch² copper pour on the PCB. Accurate thermal design using this RθJC enables prediction of junction temperature rise under defined power dissipation conditions for MC7808CDT.
How does the MC7808CDT handle short-circuit conditions?
The MC7808CDT limits short-circuit output current to approximately 0.2 A when input voltage is 35 VDC, per the Electrical Characteristics table. Combined with thermal shutdown activation at +150°C junction temperature, this dual-protection scheme prevents destructive failure during sustained output faults. Recovery is automatic after fault removal and cooldown - no latch or manual reset is required for MC7808CDT.
MC7808CDT 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
MC7808CDT FAQ
1.How can I place an order for MC7808CDT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC7808CDT 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 MC7808CDT reliable?
The price and inventory of MC7808CDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC7808CDT is usually 5 days.
3.What payment methods are accepted for MC7808CDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC7808CDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC7808CDT?
MC7808CDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC7808CDT 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 MC7808CDT?
For technical support, including MC7808CDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC7808CDT requirements.
6.How does Aetrix verify that MC7808CDT is sourced from the original manufacturer or authorized distributors?
All MC7808CDT 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 MC7808CDT meets industry standards.
7.What is the process for return or replacement of MC7808CDT?
All MC7808CDT units undergo pre-shipment inspection (PSI). If there is an issue with MC7808CDT, 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 MC7808CDT part is unused and in its original packaging.
Return procedure for MC7808CDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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