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onsemi SCD7805ACTG
- Part No.:
- SCD7805ACTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
SCD7805ACTG.pdf
- Description:
- IC REG LINEAR 5V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:425
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Product details
Overview
SCD7805ACTG from onsemi is a 5.0 V, 1.0 A fixed-output linear voltage regulator in TO-220-3 package with ±2% output voltage tolerance at 25°C, internal thermal shutdown, and short-circuit current limiting. It delivers stable 5 V power for microcontroller-based control modules, industrial sensor interfaces, and embedded power rails where input-to-output differential remains ≥2.0 V.
For engineers reviewing the SCD7805ACTG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, real-world load/line regulation behavior, and validated alternative options for industrial-grade 5 V local regulation.
Technical Context
The SCD7805ACTG implements a monolithic NPN pass transistor architecture with safe-area compensation, enabling reliable operation up to 15 W power dissipation with adequate heatsinking. Its internal current limiting activates at 0.2 A under short-circuit conditions, and thermal shutdown engages at +150°C junction temperature.
Designed for fixed-voltage use without external components, it supports adjustable configurations via external resistors or op-amps (e.g., Figure 9), and can be current-boosted using external PNP transistors (e.g., MJ2955) for loads beyond 1.0 A - though short-circuit protection is not retained in boosted mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.9 V to 5.1 V at TJ = 25°C (±2% tolerance); maintains 4.8–5.2 V across 5 mA–1.0 A load and 7.5–20 V input. |
| Maximum Output Current | 1.0 A continuous (derated above TA = 25°C); peak current capability of 2.2 A at TJ = 25°C. |
| Dropout Voltage | 2.0 V at IO = 1.0 A and TJ = 25°C - requires minimum 7.0 V input for stable 5.0 V output. |
| Ripple Rejection | 68 dB typical at 120 Hz (8–18 V input, 500 mA load) - suppresses AC ripple from unregulated DC supplies. |
| Quiescent Current | 3.2–6.0 mA over full operating range - low bias current minimizes no-load power loss. |
| Thermal Resistance | RθJA = 65°C/W (no heatsink); RθJC = 5.0°C/W - enables thermal design with discrete heatsink mounting on Pin 2 (ground). |
| Operating Junction Temp | +150°C maximum - supports industrial ambient temperatures up to +125°C with proper PCB copper area or heatsink. |
Pinout & Package
SCD7805ACTG uses the standard TO-220-3 (Case 221AB) package with heatsink surface electrically connected to Pin 2 (Ground). The tab is grounded and must be isolated from chassis unless system ground reference permits direct mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input terminal; requires ≥2.0 V headroom above 5.0 V output; bypass capacitor (≥0.33 µF) recommended if >5 cm from filter. |
| Pin 2 | Ground | Circuit common reference and thermal path; tab connection enables heatsink mounting; must share ground with input and output. |
| Pin 3 | Output | Regulated 5.0 V output; no output capacitor required for stability, but ≥0.1 µF improves transient response. |
Key Features
| Feature | Design Value |
|---|---|
| No external components needed | Operates as standalone 5 V regulator - eliminates BOM cost and layout complexity for basic local regulation. |
| Internal thermal overload protection | Shuts down at +150°C junction temperature and auto-recovers upon cooling - prevents permanent damage during sustained overload. |
| Short-circuit current limiting | Clamps output to ≤0.2 A when Vin = 35 V - protects both regulator and upstream supply during fault conditions. |
| Safe-area compensated pass transistor | Reduces short-circuit current as VIN–VOUT increases - enhances reliability under high-differential-voltage faults. |
| Pb-free TO-220 package | RoHS-compliant lead finish and packaging - meets environmental compliance requirements for industrial and automotive programs. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) Logic Rail |
|---|---|
|
Use Scenario: Powers 3.3 V LDOs, CAN transceivers, and microcontroller peripherals in DIN-rail mounted PLC modules with 24 V DC input. IC Role / Device Role / Timing Role: Primary 5 V local regulator supplying downstream logic and interface ICs; operates continuously at 650 mA load. Use Value: Maintains ±2% output accuracy across −40°C to +85°C ambient with <1.3 mV load regulation - ensures consistent ADC reference and digital logic thresholds. |
Use Scenario: Supplies 5 V to microcontroller, EEPROM, and LIN transceiver in vehicle body control units powered from 12 V battery rail. IC Role / Device Role / Timing Role: Fixed-voltage post-regulator after DC-DC converter; handles cold-crank (6.5 V min) and load-dump (35 V max) transients via built-in protection. Use Value: Withstands 35 V input surges and shuts down thermally before junction exceeds 150°C - eliminates need for external TVS or thermal cutoff. |
| Medical Patient Monitor Sensor Interface | Point-of-Sale Terminal Mainboard Power |
|
Use Scenario: Provides clean 5 V to analog front-end amplifiers and precision ADCs in portable patient monitors with battery + wall adapter inputs. IC Role / Device Role / Timing Role: Low-noise local regulator; output noise <10 µV/V (10 Hz–100 kHz) preserves signal integrity for biopotential measurements. Use Value: 68 dB ripple rejection at 120 Hz suppresses switching noise from upstream DC-DC converters - avoids aliasing in 16-bit ADC sampling. |
Use Scenario: Delivers 5 V to USB hub controllers, display drivers, and secure element ICs in retail POS terminals with 12 V input. IC Role / Device Role / Timing Role: Cost-optimized main rail regulator; operates at 850 mA average load with intermittent 1.0 A peaks during printer activation. Use Value: 2.2 A peak current capability handles motor startup surges without brownout - sustains system responsiveness during peripheral activity. |
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 |
|---|---|---|---|
| MC7805CD2TR4G | Same 5 V/1 A spec, but ±4% tolerance (not ±2%), higher quiescent current (up to 8.0 mA), and rated for 0°C to +125°C only - no extended temp grade. | Lacks tight 2% tolerance and lower IB; suitable for non-critical consumer-grade rails where cost is primary. | Select SCD7805ACTG when ±2% output accuracy and <6.0 mA quiescent current are required for industrial or medical use. |
| LM7805CDT/NOPB | 5 V/1.5 A rating, but no guaranteed short-circuit limit (typical ISC ≈ 0.75 A), higher dropout (2.5 V), and no safe-area compensation. | Higher peak current but less robust fault protection; may require external current limiting or thermal monitoring. | Choose SCD7805ACTG for applications demanding guaranteed 0.2 A short-circuit clamp and thermal self-protection without added circuitry. |
Compared with MC7805CD2TR4G and LM7805CDT/NOPB, the SCD7805ACTG offers tighter initial tolerance, lower quiescent current, and integrated safe-area compensation - making it preferable for industrial systems requiring predictable fault behavior and long-term output stability.
Availability
SCD7805ACTG is available at Aetrix Electronics and suitable for industrial PLC power rails, automotive body control units, and medical sensor interfaces requiring stable component supply with full traceability and lifecycle management.
Supply support for SCD7805ACTG 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 focused on energy-efficient electronics for automotive, industrial, cloud, and IoT applications.
The SCD7800 series was designed specifically for ruggedized fixed-voltage regulation in harsh environments - emphasizing thermal resilience, fault containment, and long-term parametric stability over wide temperature ranges.
FAQ
What is the maximum input voltage for SCD7805ACTG?
The absolute maximum input voltage for SCD7805ACTG is 40 Vdc, but the recommended operating range is 7.5 Vdc to 20 Vdc. Exceeding 35 Vdc risks triggering internal short-circuit current limiting (ISC = 0.2 A), and sustained operation above 25 Vdc significantly increases power dissipation - requiring careful thermal design per Figure 12.
Does SCD7805ACTG require an input capacitor?
Yes - an input bypass capacitor of ≥0.33 µF (tantalum, mylar, or low-ESR ceramic) is recommended whenever the SCD7805ACTG is located more than 5 cm from the main power filter or drives large capacitive loads. This ensures high-frequency stability and prevents oscillation under dynamic load conditions.
Can SCD7805ACTG be used in adjustable-output configurations?
Yes - the SCD7805ACTG can be configured as an adjustable regulator using an external op-amp (e.g., MC1741G) and feedback resistors (Figure 9), supporting outputs from 7.0 V to 20 V. However, the minimum output is limited to ≥2.0 V above the internal 5 V reference - so true sub-5 V adjustment is not possible.
What is the thermal shutdown threshold of SCD7805ACTG?
The SCD7805ACTG activates thermal shutdown at +150°C junction temperature (TJ). It remains latched off until junction temperature falls below approximately +135°C, then automatically resumes regulation. This behavior is confirmed in the Maximum Ratings table and Figure 5 (output voltage vs. TJ).
Is SCD7805ACTG pin-compatible with standard 7805 regulators?
Yes - SCD7805ACTG uses the industry-standard TO-220-3 pinout (Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output) and matches mechanical footprint and thermal pad connectivity of legacy 7805 devices. No PCB layout changes are required for drop-in replacement where ±2% tolerance and enhanced fault protection are acceptable.
SCD7805ACTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 35V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 83dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
SCD7805ACTG FAQ
1.How can I place an order for SCD7805ACTG through Aetrix?
Please submit a Request for Quotation (RFQ) for SCD7805ACTG 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 SCD7805ACTG reliable?
The price and inventory of SCD7805ACTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCD7805ACTG is usually 5 days.
3.What payment methods are accepted for SCD7805ACTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCD7805ACTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCD7805ACTG?
SCD7805ACTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCD7805ACTG 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 SCD7805ACTG?
For technical support, including SCD7805ACTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCD7805ACTG requirements.
6.How does Aetrix verify that SCD7805ACTG is sourced from the original manufacturer or authorized distributors?
All SCD7805ACTG 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 SCD7805ACTG meets industry standards.
7.What is the process for return or replacement of SCD7805ACTG?
All SCD7805ACTG units undergo pre-shipment inspection (PSI). If there is an issue with SCD7805ACTG, 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 SCD7805ACTG part is unused and in its original packaging.
Return procedure for SCD7805ACTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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