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onsemi KA7808AE
- Part No.:
- KA7808AE
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
KA7808AE.pdf
- Description:
- IC REG LINEAR 8V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,529
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Product details
Overview
KA7808AE from ON Semiconductor is a fixed-output +8 V, 1 A three-terminal positive linear voltage regulator in TO-220 (dual-gauge) package, featuring thermal overload protection, short-circuit protection, and safe operating area (SOA) protection. It delivers stable DC power for industrial control logic, embedded microcontroller supply rails, and analog sensor interfaces requiring ±2% output tolerance at 25°C.
For engineers reviewing the KA7808AE datasheet, pinout, applications, or equivalent options, this page provides verified electrical specifications, thermal performance data, real-world load/line regulation behavior, and validated alternative options for legacy design continuity and supply chain resilience.
Technical Context
The KA7808AE employs an internal series pass transistor with error amplifier, reference voltage generator, current-limiting circuitry, thermal shutdown comparator, and SOA protection logic. Its architecture ensures stable regulation under varying line (VI = 10.5–25 V) and load (IO = 5 mA–1 A) conditions without external compensation.
It operates across 0°C to +125°C junction temperature range with guaranteed 2 V dropout voltage at 1 A, 17 mΩ output resistance at 1 kHz, and 56–73 dB ripple rejection (120 Hz), making it suitable for unregulated DC input stages derived from rectified AC or switching pre-regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +8.0 V nominal, ±2% tolerance at 25°C - ensures compatibility with 8 V logic systems and analog circuits requiring tight DC bias stability |
| Output Current | Up to 1 A continuous - supports moderate-power microcontrollers, op-amps, and peripheral ICs without external boost circuitry |
| Dropout Voltage | 2 V at 1 A and 25°C - mandates minimum 10 V input for regulated 8 V output, limiting use in ultra-low-input applications |
| Ripple Rejection | 56 dB min (120 Hz, VI = 11.5–21.5 V) - suppresses rectified AC ripple in offline power supplies before sensitive analog stages |
| Quiescent Current | 5–6 mA at 25°C - enables low-noise operation while minimizing standby power loss in always-on subsystems |
| Thermal Resistance (Junction-to-Case) | 5°C/W - requires heatsink for >500 mA continuous load at ambient >60°C to avoid thermal shutdown |
| Short-Circuit Current | 230 mA typical - limits fault energy during output shorts, reducing risk of PCB trace damage or fire hazard |
Pinout & Package
KA7808AE is housed in a 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 primary thermal path to heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated DC input supply connection | Accepts 10.5–25 V DC; must be decoupled with ≥0.33 μF ceramic capacitor close to pin to prevent oscillation |
| 2 (GND) | Reference node and thermal interface | Common return for input/output; metal tab is GND-connected - isolation washer required if heatsink is chassis-grounded |
| 3 (Output) | Regulated +8 V DC output | Delivers up to 1 A; requires ≥0.1 μF ceramic output capacitor for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +8 V output with ±2% tolerance | Eliminates need for external feedback resistors - reduces BOM count and layout complexity in cost-sensitive designs |
| Internal thermal shutdown | Activates at ~150°C junction temperature - prevents permanent damage during sustained overload or inadequate heatsinking |
| SOA-protected pass element | Guarantees safe operation across full VI–VO differential and load current range without external foldback circuitry |
| Short-circuit current limiting | Clamps output to ~230 mA during fault - enables self-recovery after fault removal without manual reset |
| Low output noise (52 μV RMS) | Minimizes interference in precision analog signal chains (e.g., ADC references, sensor front-ends) |
Applications
| Industrial PLC I/O Module Power | Embedded MCU Core Supply |
|---|---|
|
Use Scenario: Providing clean +8 V rail to digital I/O drivers and isolated communication interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Primary local regulator converting 24 V DC field bus to logic-compatible voltage for optocoupler drivers and level translators. Use Value: Thermal protection prevents field failure during sustained 24 V short-circuits on I/O terminals; ±2% tolerance ensures reliable TTL/CMOS interface margins. |
Use Scenario: Supplying core voltage to 8-bit microcontrollers (e.g., PIC18F, STM8) in battery-backed instrumentation. IC Role / Device Role / Timing Role: Linear post-regulator following a switching pre-converter, delivering low-noise power for clock generation and ADC reference. Use Value: 52 μV output noise avoids sampling errors; 1 A rating supports peak current demands during RF transmission bursts. |
| Analog Sensor Signal Conditioning | Legacy Industrial Control Panel |
|
Use Scenario: Powering precision op-amps and bridge sensors (e.g., strain gauges, RTDs) in environmental monitoring equipment. IC Role / Device Role / Timing Role: Low-drift, low-noise analog supply rail decoupled from noisy digital domains. Use Value: -0.8 mV/°C drift coefficient maintains calibration accuracy over 0–70°C operating range; 17 mΩ output impedance minimizes load-induced voltage sag. |
Use Scenario: Replacing obsolete 7808 regulators in aging panel-mounted HMIs and relay logic systems. IC Role / Device Role / Timing Role: Drop-in compatible upgrade offering tighter tolerance and improved thermal robustness versus legacy parts. Use Value: Same pinout and footprint as KA7808E; ±2% spec meets original design intent while extending operational life in high-ambient environments. |
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 |
|---|---|---|---|
| LM7808CDT/NOPB (Texas Instruments) | ±2% output tolerance, same TO-220 package, but higher quiescent current (6.5–8 mA) and lower ripple rejection (45 dB typ) | Suitable for non-noise-critical digital loads; less ideal for analog-sensor applications due to higher noise (90 μV) | Select when TI supply chain alignment is prioritized and analog performance requirements are relaxed |
| MC7808BDTG (ON Semiconductor) | Same manufacturer, ±4% tolerance (vs. KA7808AE's ±2%), identical pinout and thermal specs, but wider VO drift (-1 mV/°C) | Acceptable for general-purpose logic supply where tighter regulation is not required; lower cost variant | Choose for cost-sensitive volume production where ±4% output variation is within system margin |
Compared with LM7808CDT/NOPB, KA7808AE offers superior noise performance and ripple rejection for analog-intensive designs; versus MC7808BDTG, it delivers tighter initial accuracy and better thermal stability-critical for long-term calibration integrity in measurement systems.
Availability
KA7808AE is available at Aetrix Electronics and suitable for industrial automation, embedded control, analog instrumentation, and legacy system repair requiring stable component supply and long-term obsolescence management.
Supply support for KA7808AE 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 is a global semiconductor supplier specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The KA78XXAE series was designed by ON Semiconductor (formerly Fairchild) to provide robust, drop-in replacement linear regulators for legacy 78xx-based power systems, emphasizing thermal reliability and specification consistency across temperature.
FAQ
What is the maximum input voltage for KA7808AE?
The absolute maximum input voltage for KA7808AE is 40 V when regulating 24 V output, but for +8 V output specifically, the datasheet specifies 35 V as the safe upper limit. Operating above 35 V risks exceeding internal SOA limits and triggering thermal shutdown or permanent damage, even with adequate heatsinking.
Does KA7808AE require external capacitors?
Yes, KA7808AE requires a 0.33 μF ceramic capacitor between Input and GND, and a 0.1 μF ceramic capacitor between Output and GND, placed as close as possible to the device pins. These capacitors ensure stability, suppress high-frequency oscillation, and improve transient response-omitting them may cause regulation failure or destructive ringing.
How does KA7808AE differ from KA7808E?
KA7808AE has ±2% output voltage tolerance at 25°C and 0°C to +125°C operating range, whereas KA7808E offers ±4% tolerance and -40°C to +125°C range. KA7808AE also features tighter load regulation (10 mV vs. 100 mV) and lower quiescent current (5–6 mA vs. 5–8 mA), making it preferable for precision and low-power applications.
Can KA7808AE be used in adjustable configurations?
KA7808AE is a fixed-output regulator and is not internally configured for adjustable operation. While external resistor networks can modify output voltage, doing so violates the device's SOA protection design and voids guaranteed specifications-including thermal shutdown thresholds and short-circuit current limits-so it is not recommended or supported.
What thermal derating applies to KA7808AE at elevated ambient temperatures?
With no heatsink, KA7808AE delivers only ~300 mA at 70°C ambient due to its 5°C/W junction-to-case and ~65°C/W junction-to-air thermal resistance. With a 10°C/W heatsink and thermal interface, it sustains 1 A up to ~65°C ambient; full 1 A operation requires active cooling or ambient ≤50°C with proper heatsinking.
KA7808AE 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):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 62dB (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
KA7808AE FAQ
1.How can I place an order for KA7808AE through Aetrix?
Please submit a Request for Quotation (RFQ) for KA7808AE 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 KA7808AE reliable?
The price and inventory of KA7808AE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA7808AE is usually 5 days.
3.What payment methods are accepted for KA7808AE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA7808AE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA7808AE?
KA7808AE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA7808AE 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 KA7808AE?
For technical support, including KA7808AE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA7808AE requirements.
6.How does Aetrix verify that KA7808AE is sourced from the original manufacturer or authorized distributors?
All KA7808AE 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 KA7808AE meets industry standards.
7.What is the process for return or replacement of KA7808AE?
All KA7808AE units undergo pre-shipment inspection (PSI). If there is an issue with KA7808AE, 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 KA7808AE part is unused and in its original packaging.
Return procedure for KA7808AE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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