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onsemi SCD7812BTG
- Part No.:
- SCD7812BTG
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
SCD7812BTG.pdf
- Description:
- IC REG LINEAR 12V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,593
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Product details
Overview
SCD7812BTG from onsemi is a 12 V, 1.0 A fixed-output positive voltage regulator in TO-220-3 (Case 221AB) package, featuring internal thermal shutdown, short-circuit current limiting, safe-area compensation, and ±4% output voltage tolerance over −40°C to +125°C operating junction temperature. It delivers stable local regulation for industrial power supplies, motor control logic rails, and embedded system auxiliary voltages.
For engineers reviewing the SCD7812BTG datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, thermal performance data, package mechanical details, real-world design considerations for heatsinking and stability, and validated alternative parts for supply chain continuity.
Technical Context
The SCD7812BTG uses a monolithic bipolar pass transistor with integrated protection circuitry - including thermal overload detection that disables output above ~150°C junction temperature, and current-limiting that caps short-circuit output at 0.2 A (typical) when input is 35 Vdc. Its dropout voltage remains fixed at 2.0 V (typ) at 1.0 A load and 25°C, independent of output voltage variant within the SCD78xx family.
Designed for fixed-voltage operation without external components, it supports adjustable configurations via external resistors or op-amps (e.g., Figure 9), and current boosting with external PNP transistors (e.g., Figure 10). Ripple rejection is 55–60 dB at 120 Hz across its 14.8–27 V input range, and output noise is 10 µV/V RMS (10 Hz–100 kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 12.0 V nominal, ±4% tolerance (11.5–12.5 V) at TJ = 25°C; maintains 11.5–12.5 V over 5 mA–1.0 A load and 14.8–27 V input |
| Output Current | 1.0 A continuous (with adequate heatsinking); peak output current up to 2.2 A at TJ = 25°C |
| Dropout Voltage | 2.0 V (typ) at IO = 1.0 A and TJ = 25°C - defines minimum VIN required for regulation (≥14.0 V) |
| Ripple Rejection | 55 dB (min) at 120 Hz, 15–25 V input - suppresses AC ripple from unregulated DC supplies |
| Thermal Resistance | RθJA = 65°C/W (no heatsink); RθJC = 5.0°C/W - enables thermal design using case-to-heatsink interface |
| Quiescent Current | 3.4 mA (typ), ≤6.0 mA (max) - low bias draw preserves efficiency in standby or light-load conditions |
| Operating Temperature | −40°C to +125°C junction range - qualified for extended industrial environments |
Pinout & Package
SCD7812BTG is housed in a TO-220-3 (Case 221AB) thermally enhanced plastic package with metal tab electrically connected to Pin 2 (Ground). The tab must be mounted to a heatsink using insulating hardware if isolation is required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input | Unregulated DC input terminal; requires ≥14.0 V for full 12 V output at 1.0 A |
| Pin 2 | Ground | Common reference for input and output; tab is internally connected to this pin |
| Pin 3 | Output | Regulated 12 V output; bypass capacitor (≥0.33 µF) recommended at point-of-load |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Operates as standalone 12 V regulator with only input/output capacitors - reduces BOM count and layout complexity |
| Internal thermal overload protection | Automatically shuts down output above ~150°C junction temperature and recovers upon cooling - prevents permanent damage during overload |
| Internal short-circuit current limiting | Limits fault current to 0.2 A (typ) at VIN = 35 V - protects upstream supply and PCB traces during output shorts |
| Safe-area compensated pass transistor | Reduces short-circuit current as VIN–VOUT increases - maintains SOA integrity under high-differential-voltage faults |
| Pb-free TO-220-3 package | RoHS-compliant lead-free finish with standard through-hole mounting and thermal tab for direct heatsink attachment |
Applications
| Industrial Motor Control Logic Supply | Programmable Logic Controller (PLC) Auxiliary Rail |
|---|---|
Use Scenario: Powers microcontroller, optocouplers, and level-shifting circuitry in motor drive modules where ambient temperatures reach 85°C. IC Role / Device Role / Timing Role: Primary 12 V local regulator supplying isolated I/O and gate driver logic. Use Value: Maintains regulation across −40°C to +125°C junction range and rejects 120 Hz ripple from rectified AC inputs. |
Use Scenario: Provides clean 12 V rail for digital input conditioning and relay coil drivers in modular PLC backplanes. IC Role / Device Role / Timing Role: Fixed-output LDO replacement for legacy 7812 designs requiring extended temperature qualification. Use Value: Delivers 1.0 A with <2.0 V dropout and built-in thermal shutdown - eliminates need for discrete protection circuits. |
| Embedded System Power Management | Test & Measurement Equipment Bias Supply |
Use Scenario: Generates stable 12 V for FPGA configuration circuitry and ADC reference buffers in field-deployed edge devices. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupled from noisy main DC/DC converter. Use Value: 10 µV/V output noise (10 Hz–100 kHz) and 1.1 mΩ output impedance minimize signal path interference. |
Use Scenario: Supplies analog front-end op-amps and precision DACs in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Low-noise, fixed-voltage source for sensitive analog subsystems. Use Value: 55 dB ripple rejection at 120 Hz ensures clean DC despite transformer-derived input sources. |
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 |
|---|---|---|---|
| LM7812CDT/NOPB | Same 12 V output, 1.0 A rating, TO-220 package; but rated only for 0°C to +125°C (not −40°C) | Not suitable for cold-environment industrial deployments or automotive under-hood use | Select SCD7812BTG when extended temperature range (−40°C to +125°C) is mandatory |
| MC7812BD2TG | Identical onsemi part number prefix; same −40°C to +125°C rating, but D2 package (TO-220 variant with different leadform) | D2TG has modified lead spacing and slightly higher RθJA (70°C/W vs. 65°C/W) | SCD7812BTG preferred for standard TO-220 footprint compatibility and marginally better thermal performance |
Compared with LM7812CDT/NOPB, SCD7812BTG adds guaranteed operation down to −40°C and tighter line/load regulation at high temperature; versus MC7812BD2TG, it offers lower thermal resistance and standard lead pitch - making it optimal for new designs requiring robustness and layout flexibility.
Availability
SCD7812BTG is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controller (PLC) auxiliary rails, and embedded system power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SCD7812BTG 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, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The SCD78xx series is part of onsemi's legacy linear regulator portfolio, engineered for ruggedized fixed-voltage regulation in harsh environments - emphasizing thermal resilience, intrinsic protection, and long-term reliability over cost-optimized consumer-grade alternatives.
FAQ
What is the maximum input voltage for SCD7812BTG?
The absolute maximum input voltage for SCD7812BTG is 40 Vdc (per Maximum Ratings table). For reliable continuous operation, input should not exceed 35 Vdc - especially under full 1.0 A load - to avoid exceeding the device's 15 W power dissipation limit and triggering thermal shutdown. Derating is required above 25°C ambient.
Does SCD7812BTG require an input bypass capacitor?
Yes - an input bypass capacitor of ≥0.33 µF (tantalum, mylar, or ceramic) is recommended for SCD7812BTG, especially when the regulator is located more than a few inches from the main power supply filter. This capacitor stabilizes the input against high-frequency noise and transient spikes, preventing oscillation or erratic regulation behavior.
Can SCD7812BTG be used in adjustable-output configurations?
Yes - SCD7812BTG can be configured as an adjustable regulator using external resistors and an op-amp (as shown in Figure 9 of the datasheet). However, the minimum output voltage achievable is 2.0 V greater than the internal 12 V reference, so outputs below ~14 V are not possible without modifying the feedback network beyond standard application circuits.
What is the thermal shutdown threshold for SCD7812BTG?
The SCD7812BTG activates thermal shutdown at approximately +150°C junction temperature (TJ). Once triggered, the output is disabled until the junction cools by ~20°C, enabling automatic recovery. This threshold is not user-adjustable and is implemented via on-die thermal sensing - no external components are needed.
Is SCD7812BTG pin-compatible with standard 7812 regulators?
Yes - SCD7812BTG uses the industry-standard TO-220-3 (Case 221AB) package with identical pinout (Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output) and mechanical footprint as LM7812, MC7812, and other legacy 78xx-series regulators, enabling drop-in replacement in existing designs where extended temperature range is beneficial.
SCD7812BTG 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):
- 12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 60dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
SCD7812BTG FAQ
1.How can I place an order for SCD7812BTG through Aetrix?
Please submit a Request for Quotation (RFQ) for SCD7812BTG 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 SCD7812BTG reliable?
The price and inventory of SCD7812BTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SCD7812BTG is usually 5 days.
3.What payment methods are accepted for SCD7812BTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SCD7812BTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SCD7812BTG?
SCD7812BTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SCD7812BTG 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 SCD7812BTG?
For technical support, including SCD7812BTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SCD7812BTG requirements.
6.How does Aetrix verify that SCD7812BTG is sourced from the original manufacturer or authorized distributors?
All SCD7812BTG 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 SCD7812BTG meets industry standards.
7.What is the process for return or replacement of SCD7812BTG?
All SCD7812BTG units undergo pre-shipment inspection (PSI). If there is an issue with SCD7812BTG, 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 SCD7812BTG part is unused and in its original packaging.
Return procedure for SCD7812BTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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