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onsemi KA7805AE
- Part No.:
- KA7805AE
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
KA7805AE.pdf
- Description:
- IC REG LINEAR 5V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,747
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Product details
Overview
KA7805AE from ON Semiconductor is a fixed-output +5 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-designed for stable DC power supply in industrial control and embedded system power rails.
For engineers reviewing the KA7805AE datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal behavior under load, noise and ripple rejection performance, and real-world substitution guidance for legacy 78xx-based designs requiring tighter initial accuracy and extended temperature operation (0°C to +125°C).
Technical Context
The KA7805AE implements a classic three-terminal series pass architecture with internal error amplifier, bandgap reference, current-limiting circuitry, and thermal shutdown. Its SOA protection dynamically limits power dissipation during transient overloads without latch-up.
It operates across an input range of 7.5 V to 20 V (for 5 V output), maintains regulation up to 1 A continuous load, and delivers 68 dB ripple rejection at 120 Hz with 500 mA load-enabling use in noisy AC/DC front-end environments where filtering headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.9–5.1 V at 25°C (±2% tolerance); ensures tight logic-level compatibility for 5 V microcontrollers and peripherals |
| Max Output Current | 1 A continuous (with adequate heatsinking); supports moderate-power analog/digital subsystems |
| Dropout Voltage | 2 V at 1 A, 25°C; requires ≥7 V input for stable 5 V output under full load |
| Ripple Rejection | 68 dB at 120 Hz, 500 mA load; suppresses rectified AC ripple without external LC stages |
| Output Noise | 42 μV RMS (10 Hz–100 kHz); suitable for low-noise analog sensors and ADC references |
| Thermal Shutdown | Active at junction temperature >160°C; prevents catastrophic failure during sustained overload or poor heatsinking |
| Operating Temp Range | 0°C to +125°C (junction); validated for industrial ambient environments without derating |
Pinout & Package
KA7805AE is supplied in TO-220 (Dual Gauge) package with standard 3-pin configuration: Input (Pin 1), Ground (Pin 2), Output (Pin 3). 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 input supply | Accepts 7.5–20 V; must be decoupled with ≥0.33 μF ceramic near pin to prevent oscillation |
| 2 - GND | Reference and return node | Common ground for input/output; tab connection enables direct heatsink mounting with isolation washer if needed |
| 3 - Output | Regulated +5 V supply | Delivers up to 1 A; requires ≥0.1 μF ceramic output capacitor for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +5 V output | Eliminates external resistor network; reduces BOM count and layout complexity in cost-sensitive designs |
| ±2% output tolerance (25°C) | Tighter than standard KA7805E (±4%); improves margin for 5 V TTL/CMOS logic and USB peripheral power |
| Internal SOA protection | Prevents second breakdown during output short or capacitive load surge-no external foldback circuit needed |
| Low quiescent current | 5–6 mA typical; minimizes no-load power loss in battery-backed or always-on systems |
| 120 Hz ripple rejection | 68 dB attenuation enables direct use after bridge rectifier without additional LC filter stage |
Applications
| Industrial Power Supply | Microcontroller Board Power |
|---|---|
Use Scenario: Local 5 V rail generation from 12 V or 24 V industrial bus in PLC I/O modules. IC Role / Device Role / Timing Role: Primary linear regulator delivering clean, protected 5 V for digital logic and isolated communication interfaces. Use Value: Thermal and short-circuit protection ensure uninterrupted operation in unattended factory-floor equipment. |
Use Scenario: Powering 5 V Arduino-compatible or STM32-based development boards with USB host capability. IC Role / Device Role / Timing Role: Main 5 V supply for MCU core, USB PHY, and on-board peripherals. Use Value: ±2% output tolerance guarantees reliable USB enumeration and sensor interface timing margins. |
| Legacy Equipment Replacement | Embedded Sensor Node |
Use Scenario: Drop-in upgrade for aging KA7805E-based power supplies in test instrumentation. IC Role / Device Role / Timing Role: Direct functional replacement with improved accuracy and same pinout. Use Value: No PCB change required; tighter regulation extends calibration validity and reduces drift-related measurement errors. |
Use Scenario: Powering low-power analog sensor front-ends (e.g., strain gauge amplifiers, RTD bridges) in edge nodes. IC Role / Device Role / Timing Role: Low-noise 5 V source for precision op-amps and 16-bit ADC references. Use Value: 42 μV RMS noise and 17 mΩ output impedance preserve signal integrity and SNR in sub-mV measurements. |
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 |
|---|---|---|---|
| LM7805CDT | ±2% output tolerance, but rated only for 0°C to +125°C (same as KA7805AE); higher quiescent current (7.5 mA typ) | No integrated SOA protection; requires external current limiting for high-capacitance loads | Preferred when TI's qualification and long-term availability are prioritized over SOA robustness |
| MC7805BDTRKG | ±2% tolerance, -40°C to +125°C operating range; lower dropout (1.7 V typ at 1 A) | Broadened temp range suits automotive or outdoor deployments; slightly better efficiency at low VIN | Choose when extended cold-start capability or marginally lower dropout is critical |
Compared with LM7805CDT and MC7805BDTRKG, the KA7805AE uniquely combines SOA protection, 42 μV noise, and 68 dB ripple rejection in a single industrial-grade part-making it optimal for reliability-critical 5 V rails where load transients and input ripple coexist.
Availability
KA7805AE is available at Aetrix Electronics and suitable for industrial control systems, embedded microcontroller power supplies, and legacy equipment replacement programs requiring stable component supply and long-lifecycle support.
Supply support for KA7805AE 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 leader in energy-efficient semiconductor solutions for automotive, industrial, cloud, and IoT applications.
The KA7805AE belongs to the KA78XXAE series-designed specifically for industrial-grade fixed-voltage regulation with enhanced accuracy, thermal resilience, and built-in protection features beyond legacy 78xx families.
FAQ
What is the maximum input voltage for KA7805AE?
The absolute maximum input voltage for KA7805AE is 35 V, but the recommended operating range is 7.5 V to 20 V for reliable 5 V regulation at 1 A. Exceeding 20 V increases power dissipation and thermal stress-especially without heatsinking-and may trigger thermal shutdown during sustained load.
Does KA7805AE require external capacitors?
Yes, KA7805AE requires a 0.33 μF ceramic capacitor between Input and GND, and a 0.1 μF ceramic capacitor between Output and GND-both placed as close as possible to the device pins. These are mandatory for stability and transient response; omitting them risks oscillation or output overshoot.
How does KA7805AE differ from KA7805E?
The KA7805AE offers ±2% output voltage tolerance (vs. ±4% for KA7805E) and is specified for 0°C to +125°C operation (vs. –40°C to +125°C for KA7805E). Both share identical pinout, protection features, and thermal characteristics-but KA7805AE targets applications needing tighter initial accuracy without extended cold-range support.
Can KA7805AE be used in adjustable configurations?
While KA7805AE is optimized as a fixed +5 V regulator, it can be adapted for adjustable output using external resistors per standard 78xx "adjustable mode" schematics. However, doing so voids guaranteed specifications-including tolerance, line/load regulation, and protection thresholds-as the internal feedback network is bypassed.
Is KA7805AE RoHS compliant and lead-free?
Yes, KA7805AE is RoHS compliant and lead-free per ON Semiconductor's product documentation. It meets JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and is compatible with standard Pb-free reflow profiles-verified in the official KA78XXAE datasheet Rev. 1.9.
KA7805AE 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):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 68dB (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
KA7805AE FAQ
1.How can I place an order for KA7805AE through Aetrix?
Please submit a Request for Quotation (RFQ) for KA7805AE 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 KA7805AE reliable?
The price and inventory of KA7805AE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA7805AE is usually 5 days.
3.What payment methods are accepted for KA7805AE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA7805AE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA7805AE?
KA7805AE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA7805AE 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 KA7805AE?
For technical support, including KA7805AE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA7805AE requirements.
6.How does Aetrix verify that KA7805AE is sourced from the original manufacturer or authorized distributors?
All KA7805AE 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 KA7805AE meets industry standards.
7.What is the process for return or replacement of KA7805AE?
All KA7805AE units undergo pre-shipment inspection (PSI). If there is an issue with KA7805AE, 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 KA7805AE part is unused and in its original packaging.
Return procedure for KA7805AE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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