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onsemi KA7812AE
- Part No.:
- KA7812AE
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
KA7812AE.pdf
- Description:
- IC REG LINEAR 12V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,158
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Product details
Overview
KA7812AE from ON Semiconductor is a fixed-output +12 V, 1 A positive linear voltage regulator in TO-220 package with ±2% output voltage tolerance at 25°C, thermal overload protection, short-circuit protection, and safe operating area (SOA) protection - used in industrial power supplies, embedded control boards, and DC-powered instrumentation requiring stable low-noise 12 V bias.
For engineers reviewing the KA7812AE datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs (VO = 11.75–12.25 V @ 25°C), thermal resistance (RθJC = 5°C/W), dropout voltage (2 V @ 1 A), ripple rejection (60 dB), and noise (76 μV), all validated for the exact KA7812AE variant with 0°C to +125°C operating range.
Technical Context
The KA7812AE implements a classic three-terminal series pass architecture with internal error amplifier, bandgap reference, current-limiting circuitry, and thermal shutdown logic. Its SOA protection actively limits power dissipation during transient overloads without latch-up.
Designed for fixed-voltage operation, it requires no external feedback components but supports adjustable configurations via external resistors and transistors per typical application circuits. Input voltage range is 14.8 V to 27 V under full load, with guaranteed performance up to 30 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 11.75–12.25 V at 25°C (±2% tolerance); maintains regulation across 5 mA–1 A load and 14.8–27 V input. |
| Output Current | Up to 1 A continuous; peak current capability of 2.2 A for short durations. |
| Dropout Voltage | 2 V at 1 A and 25°C - dictates minimum input headroom required for regulation. |
| Ripple Rejection | 60 dB at 120 Hz with 500 mA load - suppresses AC line noise from unregulated DC inputs. |
| Output Noise | 76 μV RMS (10 Hz–100 kHz) - critical for analog sensor biasing and low-noise signal chains. |
| Thermal Resistance | RθJC = 5°C/W (TO-220) - enables >1 A operation with modest heatsinking (e.g., 20 cm² aluminum fin). |
| Operating Temp | 0°C to +125°C junction - suitable for industrial environments without derating below 1 A. |
Pinout & Package
KA7812AE is supplied in TO-220 (Dual Gauge) package with standard 3-pin configuration: Pin 1 = Input, Pin 2 = Ground, Pin 3 = Output. The metal tab is electrically connected to Pin 2 (GND) and serves as thermal path to heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated DC supply input | Accepts 14.8–27 V (min/max for 1 A load); must be bypassed with ≥0.33 μF ceramic near device. |
| 2 (GND) | Reference and return node | Common ground for input/output; metal tab is internally tied to this pin - isolate from chassis unless grounded. |
| 3 (Output) | Regulated +12 V output | Delivers stable 12 V to load; requires ≥0.1 μF ceramic output capacitor for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +12 V output | Eliminates external resistor network; reduces BOM count and layout complexity in dedicated 12 V rail designs. |
| ±2% output tolerance | Tighter than standard KA7812E (±4%), enabling compliance with tighter system-level voltage margins (e.g., microcontroller I/O rails). |
| Integrated SOA protection | Prevents destructive second breakdown during output short or capacitive load surge - no external foldback circuit needed. |
| Low quiescent current | 5.1–6.0 mA typical - minimizes standby power loss in always-on industrial controllers. |
| 120 Hz ripple rejection | 60 dB attenuation - allows direct use after bridge rectifier without additional LC filtering in cost-sensitive power supplies. |
Applications
| Industrial Power Supply | Embedded Control Board |
|---|---|
|
Use Scenario: Converts rectified 18–24 VAC to regulated +12 V for PLC I/O modules and relay drivers. IC Role / Device Role / Timing Role: Primary linear regulator providing clean, low-noise 12 V bias for digital logic and analog front-ends. Use Value: ±2% tolerance ensures reliable operation of 12 V solenoid drivers and ADC reference buffers without recalibration. |
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface on compact industrial controller PCB. IC Role / Device Role / Timing Role: Local point-of-load regulator delivering stable 12 V from intermediate 24 V bus. Use Value: 76 μV output noise prevents coupling into sensitive analog sensor signals and maintains CAN bus integrity. |
| DC-Powered Instrumentation | Legacy Equipment Retrofit |
|
Use Scenario: Supplies precision op-amps and reference ICs in portable multimeters and calibration tools. IC Role / Device Role / Timing Role: Low-drift voltage source with -1 mV/°C tempco supporting metrology-grade accuracy. Use Value: 60 dB ripple rejection eliminates 120 Hz hum in high-resolution measurement front-ends. |
Use Scenario: Direct replacement for obsolete 7812 variants in aging test equipment and motor drives. IC Role / Device Role / Timing Role: Pin-compatible upgrade offering improved thermal robustness and tighter output tolerance. Use Value: TO-220 footprint and identical pinout enable drop-in replacement without PCB rework or firmware changes. |
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 |
|---|---|---|---|
| LM7812CT | ±4% output tolerance; higher quiescent current (6–8 mA); RθJC = 4°C/W (slightly better thermal performance). | Less suitable for systems requiring tight 12 V margin (e.g., 12 V ±5% logic rails); same TO-220 footprint. | Select LM7812CT only if ±4% tolerance is acceptable and lower IQ is not critical. |
| MC7812ACT | ±2% tolerance like KA7812AE; wider input range (14–35 V); higher max junction temp (+150°C). | Better suited for high-ambient environments (e.g., automotive under-hood); identical pinout and function. | Choose MC7812ACT when extended temperature range or higher input voltage headroom is required. |
Compared with LM7812CT, KA7812AE offers tighter output tolerance and lower quiescent current, improving system accuracy and standby efficiency; versus MC7812ACT, it trades extended temperature rating for lower cost and legacy design compatibility in industrial settings.
Availability
KA7812AE is available at Aetrix Electronics and suitable for industrial power supplies, embedded control boards, and DC-powered instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for KA7812AE 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
ON Semiconductor (formerly Fairchild Semiconductor) is a global semiconductor manufacturer specializing in power management, analog, and discrete devices for industrial, automotive, and cloud infrastructure markets.
The KA78XXAE series was designed as a high-reliability, drop-in replacement family for legacy 78xx regulators - optimized for industrial control, instrumentation, and legacy system upgrades where stability, thermal robustness, and long-term availability are critical.
FAQ
What is the output voltage tolerance of KA7812AE over temperature?
The KA7812AE guarantees ±2% output voltage tolerance at TJ = +25°C. Over its full operating junction temperature range (0°C to +125°C), output drift is -1 mV/°C (typical), resulting in total variation within ±3.25% relative to nominal 12 V - confirmed by VO = 11.50–12.50 V across 5 mA–1 A load and 14.8–27 V input per datasheet Section 16.
Can KA7812AE replace KA7812E in existing designs?
Yes, KA7812AE is a direct functional and pin-compatible replacement for KA7812E, with identical TO-220 package, pinout, and electrical interface. Key improvements include tighter ±2% vs. ±4% output tolerance and lower quiescent current (5.1–6.0 mA vs. 5.1–8.0 mA), making KA7812AE suitable for upgraded reliability without layout changes.
What is the minimum input voltage required for KA7812AE to regulate at 1 A?
The KA7812AE requires a minimum input-to-output differential of 2 V at 1 A and 25°C (VDrop = 2 V). Therefore, minimum input voltage is 12 V + 2 V = 14 V. However, datasheet Section 16 specifies guaranteed operation down to 14.8 V input at full load - accounting for worst-case dropout, line regulation, and temperature effects.
Does KA7812AE require external capacitors, and what values are recommended?
Yes, KA7812AE requires external capacitors for stability and transient response: a 0.33 μF ceramic capacitor between Input and GND (close to pins), and a 0.1 μF ceramic capacitor between Output and GND. Larger bulk capacitance (e.g., 470 μF electrolytic) may be added at the input for ripple reduction, but the ceramics are mandatory per Figure 6 in the datasheet.
How does KA7812AE handle short-circuit conditions?
KA7812AE incorporates integrated short-circuit protection that limits output current to approximately 230–250 mA during sustained output-to-ground faults (per Section 16 ISC = 250 mA at TA = +25°C). Combined with thermal shutdown and SOA protection, this prevents device destruction and allows safe recovery once fault is removed.
KA7812AE 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):
- 12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
KA7812AE FAQ
1.How can I place an order for KA7812AE through Aetrix?
Please submit a Request for Quotation (RFQ) for KA7812AE 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 KA7812AE reliable?
The price and inventory of KA7812AE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA7812AE is usually 5 days.
3.What payment methods are accepted for KA7812AE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA7812AE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA7812AE?
KA7812AE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA7812AE 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 KA7812AE?
For technical support, including KA7812AE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA7812AE requirements.
6.How does Aetrix verify that KA7812AE is sourced from the original manufacturer or authorized distributors?
All KA7812AE 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 KA7812AE meets industry standards.
7.What is the process for return or replacement of KA7812AE?
All KA7812AE units undergo pre-shipment inspection (PSI). If there is an issue with KA7812AE, 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 KA7812AE part is unused and in its original packaging.
Return procedure for KA7812AE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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