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Diodes Incorporated AS7805ATF-E1
- Part No.:
- AS7805ATF-E1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
AS7805ATF-E1.pdf
- Description:
- IC REG LINEAR 5V 1A TO220F-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,904
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Product details
Overview
AS7805ATF-E1 from Diodes Incorporated is a 3-terminal, fixed +5V positive linear voltage regulator delivering up to 1A output current with ±4% output voltage accuracy over −40°C to +125°C. It integrates internal short-circuit current limiting, thermal shutdown, and safe-area protection, and is packaged in TO-220-3 (Option 1) for use in microprocessor power supplies, motherboard local regulation, and post-regulation of switching supplies.
For engineers reviewing the AS7805ATF-E1 datasheet, AS7805ATF-E1 pinout, AS7805ATF-E1 application, or AS7805ATF-E1 equivalent, key selection criteria include dropout voltage (2V at 1A), line/load regulation (≤50 mV), PSRR (70 dB at 120 Hz), quiescent current (3.2–6 mA), and thermal resistance (θJA = 60°C/W).
Technical Context
The AS7805ATF-E1 implements a monolithic series pass architecture with built-in current-limiting circuitry, thermal foldback, and safe-area compensation to prevent transistor saturation during overload. Its internal bandgap reference and error amplifier maintain stable 5V output across input voltages from 7.5V to 25V.
Designed for high-reliability linear regulation, it operates without external components beyond input/output capacitors (0.33 µF and 0.1 µF typical), supports peak output current up to 2.2A transiently, and exhibits low output noise (10 µV/√Hz) and low output resistance (10 mΩ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed +5.0 V, ±4% tolerance over full temperature range ensures compatibility with 5V logic and analog subsystems. |
| Max Output Current | 1 A continuous; enables direct powering of microcontrollers, FPGAs, and peripheral ICs without external boost stages. |
| Dropout Voltage | 2 V at 1 A, TJ = +25°C - defines minimum VIN–VOUT headroom required for regulation. |
| Line Regulation | ≤50 mV over VIN = 7.5–20 V - limits output drift due to input supply variation. |
| Load Regulation | ≤50 mV over IOUT = 5 mA–1 A - maintains stable voltage across dynamic load changes. |
| PSRR | 70 dB at 120 Hz - suppresses ripple from upstream switching converters in hybrid power architectures. |
| Quiescent Current | 3.2–6 mA - determines no-load power loss and impacts standby efficiency in always-on systems. |
Pinout & Package
AS7805ATF-E1 is supplied in the TO-220-3 (Option 1) package - a through-hole, thermally robust plastic case with exposed tab for heatsink mounting. Pin 1 is INPUT, Pin 2 is GND, Pin 3 is OUTPUT (front-view orientation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INPUT | Voltage input terminal; accepts 7.5–25 V DC; requires ≥0.33 µF ceramic or tantalum bypass capacitor. |
| 2 | GND | Ground reference for both control circuitry and output stage; must be low-impedance connection to system ground plane. |
| 3 | OUTPUT | Regulated +5 V output; requires ≥0.1 µF ceramic capacitor for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Thermal shutdown protection | Activates at TJ ≈ +150°C and latches off until junction cools - prevents permanent damage under sustained overload or poor heatsinking. |
| Internal short-circuit current limit | Clamps output current to ~50 mA during hard short - avoids catastrophic failure and enables safe recovery after fault removal. |
| Safe-area compensation | Prevents second breakdown of the series pass transistor by dynamically adjusting bias under high VCE/IC stress conditions. |
| Lead-free & RoHS-compliant | Fully lead-free construction with matte tin-plated leads - meets EU RoHS 2015/863/EU and supports automated soldering per J-STD-020 Level 3. |
| Low output noise | 10 µV/√Hz (10 Hz–100 kHz) - minimizes interference in sensitive analog circuits like ADC references or audio preamps. |
Applications
| Microprocessor Power Supply | Motherboard Local Regulation |
|---|---|
Use Scenario: Providing clean, stable 5V rail to an ARM Cortex-M7 MCU and its peripherals on a compact industrial controller PCB. IC Role / Device Role / Timing Role: Primary linear regulator supplying core logic voltage; replaces switching solution where EMI sensitivity prohibits inductors. Use Value: Eliminates need for external current limiting or thermal monitoring circuitry while maintaining <±2% output deviation under 100 mA–900 mA load steps. | Use Scenario: On-board 5V generation for USB hub controllers, PCIe slot management ICs, and BIOS flash memory on ATX-compatible motherboards. IC Role / Device Role / Timing Role: Local point-of-load regulator placed near high-speed digital ICs to minimize IR drop and improve transient response. Use Value: Delivers 1A peak current with ≤50 mV load regulation and 70 dB ripple rejection - reduces need for bulk capacitance and simplifies layout. |
| Post-Regulation for Switching Supplies | Telecom Line Card Power |
Use Scenario: Downstream filtering stage after a 12V buck converter in a PoE-powered network switch, cleaning residual switching noise before feeding PHY ICs. IC Role / Device Role / Timing Role: Low-noise linear post-regulator; improves PSRR and reduces conducted EMI into Ethernet PHY and magnetics. Use Value: Achieves 10 µV/√Hz output noise and 70 dB 120 Hz ripple suppression - meets IEEE 802.3af noise floor requirements for Gigabit Ethernet. | Use Scenario: Powering FPGA configuration memory, CPLD supervisors, and serial EEPROMs on telecom line cards operating in extended temperature environments. IC Role / Device Role / Timing Role: Temperature-stable 5V source supporting −40°C to +85°C ambient operation with guaranteed ±4% output accuracy. Use Value: Maintains regulation across full industrial temperature range without derating - eliminates need for external trimming or calibration. |
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-TR | Higher quiescent current (5.5–8 mA), lower PSRR (65 dB), θJA = 65°C/W - less efficient thermal performance. | Compatible in TO-220-3 footprint but requires larger heatsink for 1A continuous loads at elevated ambient. | Select when legacy LM78xx design reuse is prioritized over thermal/noise optimization. |
| MC7805BDTRKG | Wider input range (7–35 V), tighter initial tolerance (±2%), but higher dropout (2.5 V) and no "Green" RoHS compliance. | Suitable for higher-input industrial systems but not qualified for halogen-free ("Green") manufacturing lines. | Choose for applications requiring tighter initial accuracy and broader VIN range where RoHS exemption is acceptable. |
Compared with LM7805CDT-TR and MC7805BDTRKG, the AS7805ATF-E1 offers superior PSRR (70 dB vs. ≤65 dB), lower quiescent current (3.2–6 mA vs. ≥5.5 mA), and full halogen/antimony-free "Green" compliance - making it optimal for noise-sensitive, thermally constrained, and environmentally regulated designs.
Availability
AS7805ATF-E1 is available at Aetrix Electronics and suitable for microprocessor power supplies, motherboard local regulation, and post-regulation of switching supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AS7805ATF-E1 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
Diodes Incorporated is a global semiconductor manufacturer specializing in discrete, analog, and mixed-signal devices, with design centers across Asia, Europe, and the U.S., and ISO/TS 16949-certified wafer fabrication and assembly facilities.
The AS78XXA series belongs to Diodes' linear regulator product line, engineered specifically for high-reliability, cost-effective local voltage regulation in computing, telecom, and industrial equipment where simplicity, safety features, and thermal robustness are critical.
FAQ
What is the maximum input voltage for AS7805ATF-E1?
The absolute maximum input voltage is 36 V, but the recommended operating range is 7.5 V to 25 V per the datasheet's Recommended Operating Conditions table. Exceeding 25 V risks exceeding power dissipation limits and triggering thermal shutdown under 1A load, especially without adequate heatsinking.
Does AS7805ATF-E1 require external capacitors?
Yes - a minimum 0.33 µF capacitor on the INPUT pin and 0.1 µF on the OUTPUT pin are mandatory for stability and transient response. Ceramic X7R or tantalum types are recommended; placement must be within 5 mm of the respective pins to minimize parasitic inductance.
Can AS7805ATF-E1 be used in automotive applications?
No - AS7805ATF-E1 is not AEC-Q100 qualified. While it operates across −40°C to +125°C junction temperature, it lacks automotive-specific qualification, PPAP documentation, and IATF 16949-manufactured lot traceability. Diodes offers separate AEC-Q100-grade regulators (e.g., AP7361Q) for automotive use.
How does thermal performance vary between TO-220-3 and TO-263-2 packages?
AS7805ATF-E1 uses TO-220-3 (θJA = 60°C/W); TO-263-2 variants (e.g., AS7805ASTR-G1) have θJA = 50°C/W due to superior PCB copper thermal spreading. For identical 1A loads and ambient, TO-263-2 runs ~10°C cooler - enabling higher power density or reduced heatsink size in space-constrained layouts.
AS7805ATF-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-3 Full Pack
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 25V
- 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:
- 70dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220F-3
AS7805ATF-E1 FAQ
1.How can I place an order for AS7805ATF-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS7805ATF-E1 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 AS7805ATF-E1 reliable?
The price and inventory of AS7805ATF-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS7805ATF-E1 is usually 5 days.
3.What payment methods are accepted for AS7805ATF-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS7805ATF-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS7805ATF-E1?
AS7805ATF-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS7805ATF-E1 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 AS7805ATF-E1?
For technical support, including AS7805ATF-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS7805ATF-E1 requirements.
6.How does Aetrix verify that AS7805ATF-E1 is sourced from the original manufacturer or authorized distributors?
All AS7805ATF-E1 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 AS7805ATF-E1 meets industry standards.
7.What is the process for return or replacement of AS7805ATF-E1?
All AS7805ATF-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AS7805ATF-E1, 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 AS7805ATF-E1 part is unused and in its original packaging.
Return procedure for AS7805ATF-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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