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onsemi SCD7805CTG
- Part No.:
- SCD7805CTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
SCD7805CTG.pdf
- Description:
- IC REG LINEAR 5V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,325
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Product details
Overview
SCD7805CTG from onsemi is a 5.0 V, 1.0 A fixed-output linear voltage regulator in TO-220-3 package with internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It delivers stable output under input voltages from 7.5 V to 20 V, supports ≥1.0 A continuous load, and maintains ±2% output tolerance at 25°C - ideal for local regulation in industrial power supplies and embedded control modules.
For engineers reviewing the SCD7805CTG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs (e.g., 2.0 V dropout at 1.0 A, 68 dB ripple rejection), thermal resistance (RJA = 65°C/W), package dimensions, real-world design considerations, and two validated alternative parts for supply chain continuity.
Technical Context
The SCD7805CTG uses a monolithic bipolar pass transistor architecture with built-in protection circuitry: thermal overload shutdown activates at +150°C junction temperature, and short-circuit current limiting holds peak output current to 0.2 A during fault conditions. Safe-area compensation dynamically reduces short-circuit current as VIN–VOUT increases, preventing secondary breakdown.
It operates without external components for basic regulation but requires a 0.33 µF input bypass capacitor when located >2 inches from bulk filter capacitance. Output stability is independent of output capacitance, though ≥0.1 µF improves transient response. Quiescent current remains ≤6.0 mA across full line/load/temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±2% at 25°C; maintains 4.75–5.25 V over 5 mA–1.0 A load and 7.5–20 V input - ensures compatibility with 5 V TTL/CMOS logic rails. |
| Maximum Output Current | 1.0 A continuous (with heatsink); peak current up to 2.2 A - supports motor drivers, sensor interfaces, and microcontroller power domains. |
| Dropout Voltage | 2.0 V at 1.0 A and 25°C - mandates minimum 7.0 V input for stable 5 V output under full load. |
| Ripple Rejection | 68 dB at 120 Hz, 8–18 V input - suppresses AC line noise from unregulated DC supplies feeding downstream analog circuits. |
| Thermal Resistance | RJA = 65°C/W (no heatsink); RJC = 5.0°C/W - enables thermal design using standard TO-220 mounting practices with thermal interface material. |
| Quiescent Current | 3.2–6.0 mA - low static consumption preserves efficiency in always-on subsystems like watchdog timers or real-time clocks. |
| Operating Junction Temp | +150°C maximum - supports operation in sealed enclosures or high-ambient industrial environments without derating below 1.0 A. |
Pinout & Package
SCD7805CTG uses the industry-standard TO-220-3 (Case 221AB) package with tab-connected ground (Pin 2). Heatsinking is achieved via mechanical attachment to a metal surface through the exposed tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input terminal; must exceed output by ≥2.0 V under worst-case load and ripple. |
| Pin 2 | Ground | Common reference for input and output; tab is electrically connected to this pin - requires isolation if mounted to chassis. |
| Pin 3 | Output | Regulated 5.0 V output; connects directly to load; no output capacitor required for stability but recommended for transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No external components needed | Enables drop-in replacement in legacy 7805-based designs without layout changes or BOM additions. |
| Internal thermal shutdown | Automatically disables output above +150°C junction temperature - prevents catastrophic failure during overload or poor heatsinking. |
| Short-circuit current limiting | Clamps fault current to ≤0.2 A at 35 V input - protects upstream supply and wiring from sustained overcurrent damage. |
| Safe-area compensated pass transistor | Reduces short-circuit current as VIN–VOUT rises - avoids second breakdown during high-differential-voltage faults. |
| Pb-free TO-220 package | Complies with RoHS Directive 2011/65/EU; compatible with lead-free reflow and wave soldering processes. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Powers isolated 5 V logic rails for digital input conditioning and relay driver stages in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Primary local regulator converting 24 VDC field bus to clean 5 V for microcontrollers and optocouplers. Use Value: Thermal shutdown and safe-area compensation ensure reliable operation during 24 V transients and ambient temperatures up to +70°C. |
Use Scenario: Supplies 5 V to CAN transceivers, window lift controllers, and door lock actuators in non-safety-critical vehicle subsystems. IC Role / Device Role / Timing Role: Fixed-voltage LDO providing stable rail for communication ICs and small motors. Use Value: 68 dB ripple rejection eliminates coupling of alternator noise into sensitive analog sensor interfaces. |
| Medical Infusion Pump Controller | Point-of-Sale Terminal Power Management |
Use Scenario: Delivers regulated 5 V to ARM Cortex-M4 MCU, display backlight driver, and keypad interface in battery-backed infusion devices. IC Role / Device Role / Timing Role: Main system regulator supporting low-noise analog front-end and real-time motor control timing. Use Value: 10 µV/V output noise and <1.3 mΩ output impedance maintain signal integrity for precision ADC sampling. |
Use Scenario: Provides 5 V to thermal printer head, EMV smart card reader, and touch controller in retail terminals operating 24/7. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling main 12 V supply for noise-sensitive peripherals. Use Value: Load regulation of ≤1.3 mV over 5 mA–1.0 A ensures consistent USB peripheral enumeration and data transfer reliability. |
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 TO-220-3 package; ±2% tolerance; RJA = 65°C/W; quiescent current 4.2–8.0 mA - slightly higher max IB. | Identical pinout and thermal profile; validated for industrial temp range (−40°C to +125°C) vs. SCD7805CTG's 0°C to +125°C. | Select when extended cold-start capability is required or when sourcing from alternate onsemi production lines. |
| LM7805CDT/NOPB | TO-220-3; ±2% tolerance; RJA = 65°C/W; dropout 2.0 V; but lower ripple rejection (55 dB @ 120 Hz) and no safe-area compensation. | Lacks integrated safe-area protection - requires external current-limiting design for high-VIN–VOUT use cases. | Choose only for cost-sensitive, low-differential-voltage (<10 V) applications where fault robustness is secondary. |
Compared with MC7805CD2TR4G, SCD7805CTG offers tighter thermal specification alignment for commercial-industrial hybrids; versus LM7805CDT/NOPB, it delivers superior fault resilience and noise immunity critical for medical and automotive edge nodes.
Availability
SCD7805CTG is available at Aetrix Electronics and suitable for industrial PLCs, automotive body electronics, medical infusion pumps, and point-of-sale terminals requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SCD7805CTG 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, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The SCD7800 series was designed as a customer-specific enhancement of the classic 78xx family - optimized for robustness in harsh environments with improved safe-area behavior and tighter initial tolerance control for mission-critical embedded systems.
FAQ
What is the minimum input voltage required for stable operation of the SCD7805CTG?
The SCD7805CTG requires a minimum input voltage of 7.0 V under full 1.0 A load to maintain regulation, based on its 2.0 V dropout voltage at 25°C. At light loads (5 mA), input can be as low as 5.5 V. Input ripple must not dip below this threshold at the regulator pins - hence the datasheet recommends a 0.33 µF input capacitor for remote placements.
Does the SCD7805CTG require an output capacitor for stability?
No, the SCD7805CTG is internally compensated and does not require an output capacitor for stability. However, adding ≥0.1 µF ceramic or tantalum capacitor at the output significantly improves transient response to step-load changes - especially important in microcontroller or FPGA power domains where current demand spikes rapidly.
Can the SCD7805CTG be used in adjustable-voltage configurations?
Yes, the SCD7805CTG can be configured as an adjustable regulator using external resistors and an op-amp feedback network, as shown in Figure 9 of the datasheet. The minimum adjustable output is 7.0 V (5 V + 2 V headroom), and the circuit retains the device's internal protection features - though short-circuit current limiting applies only to the 5 V internal reference path.
How does the thermal shutdown behavior of the SCD7805CTG protect the system?
The SCD7805CTG shuts down completely when junction temperature reaches +150°C, halting output current until die temperature falls by ~15°C. This hysteresis prevents cycling near trip point. Once cooled, regulation resumes automatically - no reset or power cycle is needed. This protects both the regulator and downstream circuitry from thermal runaway during heatsink failure or airflow blockage.
Is the SCD7805CTG pin-compatible with legacy 7805 regulators?
Yes, the SCD7805CTG uses the standard TO-220-3 footprint and identical Pin 1 (Input), Pin 2 (Ground), Pin 3 (Output) assignment. Its electrical behavior matches industry-standard 7805s in dropout, load/line regulation, and protection thresholds - enabling direct replacement in existing PCB layouts without modification.
SCD7805CTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- 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
SCD7805CTG FAQ
1.How can I place an order for SCD7805CTG through Aetrix?
Please submit a Request for Quotation (RFQ) for SCD7805CTG 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 SCD7805CTG reliable?
The price and inventory of SCD7805CTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCD7805CTG is usually 5 days.
3.What payment methods are accepted for SCD7805CTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCD7805CTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCD7805CTG?
SCD7805CTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCD7805CTG 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 SCD7805CTG?
For technical support, including SCD7805CTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCD7805CTG requirements.
6.How does Aetrix verify that SCD7805CTG is sourced from the original manufacturer or authorized distributors?
All SCD7805CTG 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 SCD7805CTG meets industry standards.
7.What is the process for return or replacement of SCD7805CTG?
All SCD7805CTG units undergo pre-shipment inspection (PSI). If there is an issue with SCD7805CTG, 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 SCD7805CTG part is unused and in its original packaging.
Return procedure for SCD7805CTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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