My Inquiry
My Account
onsemi KA7805AETU
- Part No.:
- KA7805AETU
- Manufacturer:
- onsemi
- Package:
- TO-220-3
- Datasheet:
-
KA7805AETU.pdf
- Description:
- FIXED POSITIVE STANDARD REGULATO
- Quantity:
- Payment:
- Shipping:
Inventory:123,301
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
KA7805AETU from Fairchild Semiconductor is a fixed-output +5 V, 1 A positive linear voltage regulator in TO-220 (dual gauge) package with ±2% output voltage tolerance over 0°C to +125°C operating range. It integrates thermal overload protection, short-circuit protection, and safe operating area (SOA) protection for robust operation in industrial power supplies and embedded systems requiring stable 5 V rail generation.
For engineers reviewing the KA7805AETU datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (2 V at 1 A), ripple rejection (68 dB at 120 Hz), output noise (42 μV), load regulation (≤100 mV), and quiescent current (5–6 mA) under varying input/output conditions.
Technical Context
The KA7805AETU employs an internal error amplifier, reference voltage generator, series pass transistor, and protection circuitry-including thermal shutdown, current limiting, and SOA monitoring-to maintain regulated output despite line/load transients and junction temperature shifts up to +125°C. Its architecture is optimized for fixed-voltage operation without external feedback components.
It operates with a minimum input-to-output differential of 2 V (dropout), supports input voltages up to 35 V (for VO = 5 V), and delivers full 1 A output current when adequately heatsinked (RθJC = 5°C/W). Output stability is ensured with standard 0.33 μF input and 0.1 μF output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +5.0 V ±2% at TJ = +25°C; maintains regulation across 5 mA–1 A load and VI = 7.5–20 V |
| Output Current | Up to 1 A continuous; peak current capability of 2.2 A for transient loads |
| Dropout Voltage | 2 V at 1 A and +25°C - dictates minimum input supply headroom required for regulation |
| Ripple Rejection | 68 dB at 120 Hz - suppresses AC ripple from rectified DC inputs in offline power supplies |
| Quiescent Current | 5–6 mA - enables low-noise, low-power biasing in always-on subsystems |
| Thermal Protection | Integrated thermal shutdown activates above safe junction temperature - prevents damage during overload or poor heatsinking |
| Short-Circuit Current | 250 mA typical - limits fault current while maintaining protection integrity |
Pinout & Package
KA7805AETU uses the TO-220 (dual gauge) package with three leads: Input (Pin 1), Ground (Pin 2), Output (Pin 3). The metal tab is electrically connected to Pin 2 (GND) and serves as thermal interface to heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Unregulated DC input supply connection | Accepts 7.5–35 V DC; must exceed output by ≥2 V to sustain regulation under full load |
| 2 (GND) | Common reference and thermal path | Reference node for both input and output; metal tab is GND-connected and requires insulated mounting if chassis ground isolation is needed |
| 3 (Output) | Regulated +5 V DC output | Delivers up to 1 A with ≤100 mV load regulation; requires 0.1 μF ceramic capacitor for stability |
Key Features
| Feature | Design Value |
|---|---|
| ±2% output voltage tolerance | Tighter than standard KA7805E (±4%), enabling higher-precision 5 V rails in instrumentation and control logic |
| 0°C to +125°C operating range | Supports industrial ambient environments without derating-unlike commercial-grade variants limited to -40°C to +125°C but with wider tolerance |
| 68 dB ripple rejection at 120 Hz | Superior to baseline KA7805E (62 dB), improving immunity to transformer-rectifier ripple in AC/DC adapters |
| 5–6 mA quiescent current | Lower than KA7805E (5–8 mA), reducing no-load power loss in battery-backed or energy-sensitive systems |
| Integrated SOA protection | Prevents secondary breakdown of the pass transistor during high-VDS/ID stress, enhancing reliability in dynamic load applications |
Applications
| Industrial Power Supply | Embedded Control Unit |
|---|---|
Use Scenario: 24 V DC input converted to stable 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary 5 V linear regulator supplying microcontroller, ADC, and digital isolators. Use Value: ±2% tolerance ensures accurate analog reference and logic-level compatibility; thermal protection sustains operation during enclosure temperature rise. | Use Scenario: On-board 5 V rail generation for ARM Cortex-M4-based motor controller with CAN and GPIO peripherals. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling MCU core and peripheral domains. Use Value: 68 dB ripple rejection minimizes switching noise coupling into sensitive analog circuits; 1 A capacity supports burst-mode actuator drivers. |
| Test & Measurement Equipment | Legacy System Retrofit |
Use Scenario: Precision 5 V reference for multimeter front-end amplifiers and calibration circuitry. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source feeding op-amp bias networks and DAC references. Use Value: 42 μV output noise and -0.8 mV/°C drift ensure measurement repeatability across lab temperature ranges. | Use Scenario: Drop-in replacement for aging KA7805E regulators in field-deployed HVAC controllers. IC Role / Device Role / Timing Role: Direct functional upgrade retaining same PCB footprint and thermal design. Use Value: Identical pinout and TO-220 package enable zero-layout change; tighter tolerance improves long-term system accuracy without firmware updates. |
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% tolerance, TO-220 package, but higher quiescent current (5.5–8 mA) and lower ripple rejection (62 dB) | Widely available but less suitable for low-noise or thermally constrained designs | Select LM7805CDT/NOPB only when legacy TI ecosystem compatibility is required and tighter noise/drift specs are not critical |
| MC7805BDTG | ±2% tolerance, TO-220, 65 dB ripple rejection, 45 μV noise, and -1.0 mV/°C drift | Better noise performance than KA7805AETU but slightly worse thermal coefficient | Choose MC7805BDTG where ultra-low noise is prioritized over temperature stability in precision analog stages |
Compared with LM7805CDT/NOPB and MC7805BDTG, the KA7805AETU offers superior ripple rejection (68 dB) and tighter thermal drift (-0.8 mV/°C), making it optimal for industrial power rails where EMI resilience and temperature consistency are critical.
Availability
KA7805AETU is available at Aetrix Electronics and suitable for industrial power supplies, embedded control units, test equipment, and legacy system retrofits requiring stable component supply with guaranteed long-term availability.
Supply support for KA7805AETU 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
Fairchild Semiconductor was a leading designer of high-performance analog and power ICs, acquired by ON Semiconductor in 2016; its legacy linear regulator portfolio remains widely deployed in industrial and automotive systems.
The KA78XXAE series was engineered specifically for rugged, fixed-output DC-DC conversion in cost-sensitive industrial controls and legacy equipment where reliability, thermal robustness, and drop-in replaceability are essential.
FAQ
What is the maximum input voltage rating for KA7805AETU?
The KA7805AETU has an absolute maximum input voltage of 35 V when regulating 5 V output. Operation above this level risks permanent damage. For reliable long-term use, input should be limited to ≤30 V with adequate heatsinking, especially at high ambient temperatures or full 1 A load.
Does KA7805AETU require external capacitors, and what values are recommended?
Yes, KA7805AETU requires a 0.33 μF ceramic capacitor on the input and a 0.1 μF ceramic capacitor on the output for stability and transient response. These values are specified in the datasheet test circuit and must be placed close to the device pins to prevent oscillation or noise coupling.
How does the ±2% output tolerance of KA7805AETU compare to the standard KA7805E variant?
The KA7805AETU's ±2% output tolerance at +25°C is half that of the KA7805E (±4%). This tighter spec directly improves system-level accuracy in applications like ADC references and logic-level translation, where even small deviations affect measurement fidelity or timing margins.
Can KA7805AETU be used in adjustable-output configurations?
Yes, KA7805AETU can be configured as an adjustable regulator using external resistors per Figure 11 in the datasheet. However, doing so forfeits its factory-trimmed ±2% accuracy and introduces dependency on resistor tolerance and quiescent current drift - fixed-output use is strongly recommended for specified performance.
Is KA7805AETU pin-compatible with other 7805-family regulators in TO-220 packages?
Yes, KA7805AETU uses the industry-standard TO-220 pinout (Input–GND–Output), matching LM7805, MC7805, and all compatible 78xx regulators. Mechanical and electrical pin compatibility enables direct substitution without PCB modification, provided thermal and electrical design margins are verified.
KA7805AETU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Active
- 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
KA7805AETU FAQ
1.How can I place an order for KA7805AETU through Aetrix?
Please submit a Request for Quotation (RFQ) for KA7805AETU 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 KA7805AETU reliable?
The price and inventory of KA7805AETU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA7805AETU is usually 5 days.
3.What payment methods are accepted for KA7805AETU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KA7805AETU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KA7805AETU?
KA7805AETU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA7805AETU 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 KA7805AETU?
For technical support, including KA7805AETU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA7805AETU requirements.
6.How does Aetrix verify that KA7805AETU is sourced from the original manufacturer or authorized distributors?
All KA7805AETU 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 KA7805AETU meets industry standards.
7.What is the process for return or replacement of KA7805AETU?
All KA7805AETU units undergo pre-shipment inspection (PSI). If there is an issue with KA7805AETU, 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 KA7805AETU part is unused and in its original packaging.
Return procedure for KA7805AETU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KA7805AETU Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
