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Diodes Incorporated AS7805AT-E1
- Part No.:
- AS7805AT-E1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-3
- Datasheet:
-
AS7805AT-E1.pdf
- Description:
- IC REG LINEAR 5V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:824
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Product details
Overview
AS7805AT-E1 from Diodes Incorporated is a fixed 5V, 1A three-terminal positive linear voltage regulator in TO-220-3 package with ±4% output voltage accuracy over –40°C to +125°C, internal thermal shutdown, and safe-area protection. It delivers stable local regulation for microprocessor power supplies and post-regulation after switching converters.
For engineers reviewing the AS7805AT-E1 datasheet, AS7805AT-E1 pinout, AS7805AT-E1 application, or AS7805AT-E1 equivalent, key selection criteria include dropout voltage (2 V at 1A), load regulation (20–50 mV), ripple rejection (70 dB at 120 Hz), quiescent current (3.2–6 mA), and thermal resistance (θJA = 60°C/W).
Technical Context
The AS7805AT-E1 implements a monolithic series pass architecture with integrated current limiting, thermal overload protection, and output transistor safe-area compensation. Its internal bandgap reference and error amplifier maintain regulation across input voltages from 7.5 V to 25 V and output loads from 5 mA to 1 A.
It operates without external components beyond recommended 0.33 µF input and 0.1 µF output capacitors. The device exhibits low output noise (10 µV/√Hz), tight line/load regulation, and stable performance up to +125°C junction temperature - enabling use in thermally constrained embedded and telecom environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±4% over full temperature range - ensures compatibility with 5V logic and analog subsystems without external trimming. |
| Max Output Current | 1 A continuous - supports high-current digital loads like microcontrollers and peripheral ICs when heatsinked. |
| Dropout Voltage | 2 V at 1 A, 25°C - defines minimum VIN–VOUT differential required to sustain regulation; impacts efficiency in low-headroom designs. |
| Ripple Rejection | 70 dB at 120 Hz - suppresses switching supply ripple and AC line noise before reaching sensitive downstream circuitry. |
| Line Regulation | 25–50 mV over VIN = 7.5–20 V - limits output variation due to input supply fluctuations, critical for stable system operation. |
| Load Regulation | 20–50 mV over IOUT = 5 mA–1 A - maintains voltage stability across dynamic load changes typical in processor core rails. |
| Quiescent Current | 3.2–6 mA - determines no-load power loss; enables efficient standby operation in always-on subsystems. |
| Thermal Resistance θJA | 60°C/W (TO-220-3) - defines junction-to-ambient temperature rise per watt; guides heatsink sizing for 1A operation. |
Pinout & Package
AS7805AT-E1 uses the TO-220-3 package (Option 1), with standard 3-pin vertical mounting and metal tab connected to GND for thermal and electrical grounding. Pin 1 is INPUT, Pin 2 is GND, Pin 3 is OUTPUT - verified from Diodes DS36562 Rev. 7-2 Figure 1 (Front View).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Voltage Input | Accepts unregulated DC input (7.5–25 V); must be decoupled with ≥0.33 µF capacitor close to pin. |
| 2 (GND) | Ground Reference | Common return path for input, output, and internal bias circuits; electrically tied to metal tab for thermal conduction. |
| 3 (OUTPUT) | Voltage Output | Delivers regulated 5 V; requires ≥0.1 µF ceramic capacitor at pin for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Short-Circuit Protection | Limits output current to ~50 mA during sustained short - prevents catastrophic failure and enables safe recovery. |
| Thermal Shutdown | Activates at +150°C junction temperature - protects die integrity during overload or insufficient heatsinking. |
| Safe-Area Compensation | Prevents secondary breakdown of output transistor under high-voltage/high-current stress - improves reliability in transient conditions. |
| Lead-Free & Halogen-Free | RoHS-compliant TO-220-3 package with matte tin plating - meets environmental compliance requirements for industrial and telecom equipment. |
| Low Load Regulation | 20–50 mV variation from 5 mA to 1 A load - eliminates need for post-regulator LDOs in moderate-precision applications. |
Applications
| Microprocessor Power Supply | Post-Regulation for Switching Supplies |
|---|---|
|
Use Scenario: Providing clean, stable 5V rail to legacy microcontrollers (e.g., 8051, PIC16) on industrial control boards. IC Role / Device Role / Timing Role: Primary local voltage regulator delivering low-noise, low-ripple power to CPU core and I/O peripherals. Use Value: Eliminates need for external feedback resistors or compensation networks; simplifies BOM while meeting ±4% tolerance requirement. |
Use Scenario: Filtering residual ripple from 5V buck converter outputs in telecom base station power modules. IC Role / Device Role / Timing Role: Linear post-regulator improving PSRR by 70 dB at 120 Hz to meet ETSI emission standards. Use Value: Reduces conducted EMI without increasing switching frequency or complexity - avoids redesign of upstream SMPS. |
| Motherboard Local Regulation | Telecommunication Equipment |
|
Use Scenario: Generating auxiliary 5V for USB hub controllers, BIOS flash memory, and real-time clock circuits on PC motherboards. IC Role / Device Role / Timing Role: Standalone 3-terminal regulator with GND-connected tab enabling direct PCB heatsinking on multi-layer boards. Use Value: Achieves 1A capability in compact TO-220 footprint - replaces larger or more expensive multi-rail PMIC solutions. |
Use Scenario: Powering line-card interface ICs (e.g., PHYs, transceivers) in carrier-grade DSLAMs and ONU units. IC Role / Device Role / Timing Role: High-reliability linear regulator operating continuously at +85°C ambient with derated 1A output. Use Value: Maintains ±4% output accuracy across –40°C to +125°C junction range - ensures signal integrity in wide-temperature deployments. |
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 | ±2% output accuracy (tighter), higher IQ (5.5–8 mA), θJA = 65°C/W (TO-252) | Preferred where tighter initial tolerance is required; less suitable for high-ambient thermal environments without extra heatsinking. | Select LM7805CDT-TR if ±2% initial accuracy is mandatory and board space allows SMT mounting. |
| MC7805BD2TR4 | ±4% accuracy same, but rated for automotive AEC-Q100 Grade 2 (–40°C to +105°C), higher PSRR (75 dB) | Required for automotive infotainment or body control modules needing qualification and extended reliability testing. | Choose MC7805BD2TR4 only for automotive programs requiring PPAP documentation and IATF 16949 traceability. |
Compared with LM7805CDT-TR and MC7805BD2TR4, AS7805AT-E1 offers identical ±4% accuracy and TO-220 mechanical robustness at lower cost, with optimized thermal resistance (60°C/W) for through-hole industrial designs - making it ideal for non-automotive, volume-sensitive embedded systems.
Availability
AS7805AT-E1 is available at Aetrix Electronics and suitable for microprocessor power supplies, telecom line cards, and motherboard auxiliary rails requiring stable component supply, RoHS compliance, and long-term industrial lifecycle support.
Supply support for AS7805AT-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 company specializing in discrete, analog, and mixed-signal devices, with design and manufacturing facilities certified to ISO 9001, IATF 16949, and ISO 14001 standards.
The AS78XXA series targets cost-sensitive, high-reliability linear regulation in industrial, computing, and communications infrastructure - emphasizing thermal robustness, lead-free compliance, and drop-in replacement capability for legacy 78xx regulators.
FAQ
What is the maximum input voltage for AS7805AT-E1?
The absolute maximum input voltage is 36 V, but the recommended operating range is 7.5 V to 25 V per Diodes DS36562 Rev. 7-2. Exceeding 25 V risks exceeding power dissipation limits at 1A load, especially without adequate heatsinking. Operation above 25 V is only permissible at reduced output current to maintain TJ ≤ +150°C.
Does AS7805AT-E1 require external capacitors?
Yes - a minimum 0.33 µF ceramic capacitor is required on the INPUT pin, and a minimum 0.1 µF ceramic capacitor on the OUTPUT pin, both placed as close as possible to their respective pins. These stabilize internal feedback and improve transient response; omitting them may cause oscillation or poor load regulation.
Is AS7805AT-E1 pin-compatible with legacy 7805 regulators?
Yes - AS7805AT-E1 uses the standard TO-220-3 (Option 1) pinout: Pin 1 = INPUT, Pin 2 = GND, Pin 3 = OUTPUT. It matches the physical and electrical footprint of industry-standard 7805 devices including LM7805 and MC7805, enabling direct replacement without PCB modification.
What thermal performance can be expected with no heatsink?
With no heatsink and still-air convection (θJA = 60°C/W), AS7805AT-E1 dissipates up to ~1.25 W before reaching +150°C junction limit at +25°C ambient - corresponding to ~625 mA at 2 V dropout. For full 1A operation, a heatsink reducing θJA to ≤30°C/W is required to maintain safe junction temperature.
AS7805AT-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- 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-220-3
AS7805AT-E1 FAQ
1.How can I place an order for AS7805AT-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS7805AT-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 AS7805AT-E1 reliable?
The price and inventory of AS7805AT-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS7805AT-E1 is usually 5 days.
3.What payment methods are accepted for AS7805AT-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS7805AT-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS7805AT-E1?
AS7805AT-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS7805AT-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 AS7805AT-E1?
For technical support, including AS7805AT-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS7805AT-E1 requirements.
6.How does Aetrix verify that AS7805AT-E1 is sourced from the original manufacturer or authorized distributors?
All AS7805AT-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 AS7805AT-E1 meets industry standards.
7.What is the process for return or replacement of AS7805AT-E1?
All AS7805AT-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AS7805AT-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 AS7805AT-E1 part is unused and in its original packaging.
Return procedure for AS7805AT-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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