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onsemi KA7805AETSTU
- Part No.:
- KA7805AETSTU
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
KA7805AETSTU.pdf
- Description:
- IC REG LINEAR 5V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,004
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Product details
Overview
KA7805AETSTU from ON Semiconductor is a fixed-output +5 V, 1 A positive linear voltage regulator in TO-220 (dual-gauge) package with ±2% output voltage tolerance at 25°C, thermal overload protection, short-circuit protection, and safe operating area (SOA) protection-used for stable DC power supply in industrial control modules, embedded microcontroller systems, and analog sensor interfaces.
For engineers reviewing the KA7805AETSTU datasheet, pinout, applications, or equivalent options, key selection criteria include output accuracy (±2%), dropout voltage (2 V at 1 A), ripple rejection (68 dB at 120 Hz), quiescent current (5–6 mA), and thermal performance (RθJC = 5°C/W) under 0°C to +125°C operating range.
Technical Context
The KA7805AETSTU implements a classic three-terminal series pass architecture with internal error amplifier, reference voltage generator, current-limiting circuitry, thermal shutdown comparator, and SOA protection logic. It operates without external compensation and requires only two external capacitors (0.33 μF input, 0.1 μF output) for stability.
Its design targets low-noise, high-reliability fixed-voltage regulation in cost-sensitive applications where simplicity, robustness, and proven thermal behavior outweigh efficiency concerns. The device delivers full 1 A output current when adequately heatsinked and maintains regulation across line (7.5–25 V input) and load (5 mA–1 A) variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +5.0 V ±2% at 25°C; ensures tight DC rail accuracy for 5 V logic and analog circuits |
| Output Current | Up to 1 A continuous; supports microcontrollers, op-amps, and small peripherals without external boost |
| Dropout Voltage | 2 V at 1 A and 25°C; defines minimum input–output differential needed to sustain regulation |
| Ripple Rejection | 68 dB at 120 Hz; suppresses rectified AC noise from unregulated supplies before downstream circuitry |
| Quiescent Current | 5–6 mA at 25°C; enables predictable standby power consumption in always-on systems |
| Thermal Resistance (Junction-to-Case) | 5°C/W; allows precise junction temperature estimation when mounted on standard TO-220 heatsinks |
| Operating Temperature Range | 0°C to +125°C; validated for industrial ambient environments without derating below 1 A |
Pinout & Package
KA7805AETSTU uses the industry-standard TO-220 (dual-gauge) package with vertical mounting orientation and metal tab electrically connected to GND. Thermal performance relies on mechanical mounting to an external heatsink via the tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated DC input connection | Accepts 7.5–25 V; must be decoupled with ≥0.33 μF ceramic capacitor close to pin |
| 2 (GND) | Ground reference and thermal path | Common return for input/output; metal tab is internally tied to this pin for heatsinking |
| 3 (Output) | Regulated +5 V output | Delivers up to 1 A; requires ≥0.1 μF ceramic capacitor at pin for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +5 V output with ±2% tolerance | Reduces BOM count and layout complexity vs. adjustable regulators requiring resistor dividers |
| Internal thermal shutdown | Automatically disables output above safe junction temperature, preventing permanent damage during overload or poor heatsinking |
| Short-circuit current limit | Clamps output current to ~250 mA during hard fault, enabling safe recovery without external fusing |
| Safe Operating Area (SOA) protection | Prevents secondary breakdown of the pass transistor under simultaneous high voltage and current stress |
| Low output noise (42 μV RMS) | Minimizes interference in noise-sensitive analog signal chains such as ADC references or sensor front-ends |
Applications
| Industrial PLC I/O Module | Microcontroller Power Supply |
|---|---|
Use Scenario: Providing clean +5 V rail to digital input conditioning circuits and optocoupler drivers in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary local voltage regulator converting 12–24 V field bus to isolated 5 V logic domain. Use Value: ±2% output tolerance ensures reliable TTL/CMOS level recognition; thermal protection prevents field failure during sustained overcurrent events. |
Use Scenario: Powering ARM Cortex-M or PIC microcontrollers and associated peripherals (UART, SPI, GPIO) in battery-backed edge nodes. IC Role / Device Role / Timing Role: Main system regulator delivering stable 5 V to MCU VDD and analog subsystems. Use Value: 68 dB ripple rejection preserves ADC accuracy; 42 μV noise floor avoids quantization errors in 12-bit+ conversions. |
| Analog Sensor Interface Board | Legacy Equipment Retrofit |
Use Scenario: Supplying bias voltage to precision op-amps, RTD bridges, and 4–20 mA transmitter ICs in process instrumentation. IC Role / Device Role / Timing Role: Low-noise analog domain regulator supporting sub-mV signal integrity. Use Value: 17 mΩ output resistance minimizes load-induced voltage sag; SOA protection guards against inductive kickback from solenoid drivers. |
Use Scenario: Replacing obsolete 7805 variants in aging test equipment, medical devices, and telecom line cards requiring long-term component availability. IC Role / Device Role / Timing Role: Drop-in functional replacement for legacy TO-220 5 V regulators with enhanced thermal margin. Use Value: 0°C to +125°C rating extends operational life in sealed enclosures; ON Semiconductor's extended product lifecycle support reduces redesign risk. |
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/NOPB | ±2% output tolerance, same TO-220 package, but higher quiescent current (5.5–8 mA) and lower ripple rejection (73 dB typ. at 120 Hz) | Higher noise sensitivity in precision analog designs; slightly reduced efficiency in battery-powered systems | Preferred where TI's long-term availability and automotive qualification (AEC-Q100 option) are required |
| MC7805BDTRKG | ±2% tolerance, DPAK package (surface-mount), RθJA = 65°C/W (vs. 65°C/W for KA7805AETSTU in TO-220), no metal tab GND tie | Requires PCB copper pour for thermal management; unsuitable for through-hole legacy layouts | Select when automated assembly, space constraints, or reflow compatibility drive SMT adoption |
Compared with LM7805CDT/NOPB and MC7805BDTRKG, KA7805AETSTU offers identical output accuracy and superior thermal resistance to case (5°C/W), enabling higher sustained current in thermally constrained chassis-mount applications without forced air cooling.
Availability
KA7805AETSTU is available at Aetrix Electronics and suitable for industrial automation, embedded control, and analog instrumentation requiring stable component supply, long-lifecycle assurance, and TO-220 through-hole compatibility.
Supply support for KA7805AETSTU 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 supplier specializing in power management, analog, and discrete components for industrial, automotive, and cloud infrastructure markets.
The KA78XXAE series was designed as a drop-in upgrade to legacy 78xx regulators-offering tighter output tolerance (±2%), improved thermal robustness, and extended temperature operation for mission-critical industrial power rails.
FAQ
What is the maximum input voltage for KA7805AETSTU?
The absolute maximum input voltage for KA7805AETSTU is 35 V when the output is 5 V. However, the recommended operating range is 7.5 V to 25 V to ensure proper regulation, thermal safety, and ripple rejection performance. Exceeding 25 V increases power dissipation and junction temperature significantly, requiring larger heatsinks or derating.
Does KA7805AETSTU require external capacitors?
Yes, KA7805AETSTU requires a 0.33 μF ceramic capacitor between input and ground, placed as close as possible to the input pin, and a 0.1 μF ceramic capacitor between output and ground, placed near the output pin. These capacitors ensure stability, improve transient response, and reduce high-frequency noise-omitting them may cause oscillation or regulation failure.
Is KA7805AETSTU pin-compatible with standard 7805 regulators?
Yes, KA7805AETSTU uses the standard TO-220 three-pin configuration (Input–GND–Output) and is mechanically and electrically pin-compatible with legacy 7805 devices including LM7805 and MC7805. No PCB layout changes are needed for direct replacement, though thermal design should verify junction temperature under worst-case load.
What protection features does KA7805AETSTU include?
KA7805AETSTU integrates thermal overload protection (shuts down above safe junction temperature), short-circuit current limiting (~250 mA), and safe operating area (SOA) protection to prevent pass transistor failure during voltage/current stress transients. These functions operate autonomously without external components.
Can KA7805AETSTU be used in adjustable configurations?
While KA7805AETSTU is optimized as a fixed +5 V regulator, it can be adapted for adjustable output using external resistors and a Zener diode per standard 78xx application notes-but doing so voids guaranteed specifications (e.g., tolerance, line/load regulation) and compromises stability and protection integrity. Fixed operation is strongly recommended.
KA7805AETSTU 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):
- 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
KA7805AETSTU FAQ
1.How can I place an order for KA7805AETSTU through Aetrix?
Please submit a Request for Quotation (RFQ) for KA7805AETSTU 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 KA7805AETSTU reliable?
The price and inventory of KA7805AETSTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA7805AETSTU is usually 5 days.
3.What payment methods are accepted for KA7805AETSTU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA7805AETSTU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA7805AETSTU?
KA7805AETSTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA7805AETSTU 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 KA7805AETSTU?
For technical support, including KA7805AETSTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA7805AETSTU requirements.
6.How does Aetrix verify that KA7805AETSTU is sourced from the original manufacturer or authorized distributors?
All KA7805AETSTU 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 KA7805AETSTU meets industry standards.
7.What is the process for return or replacement of KA7805AETSTU?
All KA7805AETSTU units undergo pre-shipment inspection (PSI). If there is an issue with KA7805AETSTU, 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 KA7805AETSTU part is unused and in its original packaging.
Return procedure for KA7805AETSTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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