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Diodes Incorporated AS7809ADTR-G1
- Part No.:
- AS7809ADTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
AS7809ADTR-G1.pdf
- Description:
- IC REG LINEAR 9V 1A TO252-2
- Quantity:
- Payment:
- Shipping:
Inventory:1,735
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Product details
Overview
AS7809ADTR-G1 from Diodes Incorporated is a 1A, three-terminal positive fixed-voltage linear regulator delivering 9V output with ±4% accuracy over -40°C to +125°C. It features internal current limiting, thermal shutdown, and safe-area compensation for robust overload immunity. Designed for local on-card regulation, it supports microprocessor power supplies and post-regulation in telecom systems with up to 1A continuous output under adequate heatsinking.
For engineers reviewing the AS7809ADTR-G1 datasheet, AS7809ADTR-G1 pinout, AS7809ADTR-G1 application, or AS7809ADTR-G1 equivalent, key selection criteria include dropout voltage (2V at 1A), load regulation (≤120mV), PSRR (60dB at 120Hz), thermal resistance (100°C/W in TO-252-2), and RoHS-compliant "Green" packaging.
Technical Context
The AS7809ADTR-G1 implements a monolithic series-pass regulator architecture with integrated bandgap reference, error amplifier, and Darlington output transistor. Its internal safe-area protection dynamically limits power dissipation during overload by coordinating current and voltage constraints across the pass device.
Thermal shutdown activates at +150°C junction temperature, and short-circuit current limiting holds output current below 0.2A during fault conditions. The device operates with input voltages up to 32V and maintains stable regulation without external components beyond standard 0.33µF input and 0.1µF output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 9V fixed, ±4% tolerance over full temperature range ensures predictable rail stability in industrial environments |
| Output Current | Up to 1A continuous, enabling direct powering of mid-power logic and analog circuitry without external boost |
| Dropout Voltage | 2V at 1A and +25°C - defines minimum VIN–VOUT headroom required to sustain regulation |
| Line Regulation | ≤120mV over VIN = 12.8V to 27V - critical for maintaining output accuracy amid supply ripple or variation |
| Load Regulation | ≤120mV over IOUT = 5mA to 1A - guarantees consistent voltage delivery across dynamic load profiles |
| PSRR | 60dB at 120Hz - suppresses low-frequency switching noise from upstream DC/DC converters |
| Quiescent Current | 3.4–6mA - enables efficient operation in always-on subsystems with minimal standby loss |
Pinout & Package
AS7809ADTR-G1 is housed in a TO-252-2 (5) surface-mount package (also designated TO252 Type CJ), featuring exposed thermal pad for enhanced PCB heat dissipation. Pin 1 is INPUT, Pin 2 is GND, and Pin 3 is OUTPUT - confirmed via Diodes' official front-view pin diagram for TO-252-2 (5) and TO252 (Type CJ) variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INPUT | Voltage input terminal; requires ≥0.33µF ceramic capacitor close to pin for stability and transient response |
| 2 | GND | Ground reference and thermal path; must be connected to large copper pour for thermal management |
| 3 | OUTPUT | Regulated 9V output; requires ≥0.1µF ceramic capacitor at pin for high-frequency noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Internal thermal shutdown | Activates at +150°C junction temperature to prevent permanent damage during sustained overload or poor heatsinking |
| Safe-area protected output transistor | Prevents second breakdown by coordinating current/voltage limits in real time during transients or shorts |
| Lead-free & halogen-free "Green" construction | Fully RoHS 3 compliant (<900ppm Br, <900ppm Cl, <1000ppm Sb); suitable for automotive and industrial environmental compliance |
| Low output noise | 10µV/√Hz typical - preserves signal integrity in sensitive analog and mixed-signal circuits |
| Stable with ceramic output capacitors | No ESR requirements; eliminates need for tantalum or electrolytic capacitors and reduces BOM cost and footprint |
Applications
| Microprocessor Power Supply | Post-Regulation for Switching Supplies |
|---|---|
Use Scenario: Providing clean, stable 9V rail to FPGA I/O banks or MCU peripherals in embedded control modules. IC Role / Device Role / Timing Role: Primary local voltage regulator delivering low-noise, tightly regulated power independent of main system rail fluctuations. Use Value: Eliminates need for external filtering stages; ±4% output accuracy ensures reliable logic-level compatibility across temperature. | Use Scenario: Downstream regulation after a 12V or 24V buck converter in telecom line cards or base station subsystems. IC Role / Device Role / Timing Role: Low-noise linear post-regulator suppressing switching ripple and improving PSRR for analog front-ends. Use Value: 60dB PSRR at 120Hz attenuates fundamental switching harmonics; TO-252 thermal pad enables compact layout without discrete heatsink. |
| Motherboard Local Regulation | Telecommunication Equipment |
Use Scenario: Dedicated 9V supply for USB hub controllers, PCIe slot aux power, or clock buffer ICs on server motherboards. IC Role / Device Role / Timing Role: Point-of-load regulator minimizing IR drop and noise coupling into high-speed digital domains. Use Value: 1A capability supports burst-mode loads; load regulation ≤120mV prevents voltage sag during hot-plug events. | Use Scenario: Powering line interface circuits (e.g., SLIC bias, codec references) in VoIP gateways and DSLAMs. IC Role / Device Role / Timing Role: Immune-to-overload regulator ensuring uninterrupted operation during line surge or short-circuit faults. Use Value: Internal current limiting and thermal shutdown maintain functional safety without external protection circuitry. |
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 |
|---|---|---|---|
| LM2940CT-9.0/NOPB | Higher dropout (0.5V typ. at 100mA vs. 2V at 1A); lower max input (26V); no safe-area protection | Better suited for low-headroom battery-powered systems; lacks robustness for industrial surge environments | Select if input voltage margin is tight and peak current <500mA; avoid for 1A continuous or high-temperature deployments |
| MC7809CD2TR4G | TO-263-2 package (θJC = 6°C/W); same 9V output but higher quiescent current (4.2–8mA); no "Green" halogen-free certification | Superior thermal performance in high-power density layouts; less stringent environmental compliance | Choose when board-level thermal resistance dominates and RoHS 3/halogen-free requirements are not mandated |
Compared with LM2940CT-9.0/NOPB and MC7809CD2TR4G, AS7809ADTR-G1 offers superior overload resilience via safe-area protection and full RoHS 3/halogen-free compliance, while trading off slightly higher dropout for guaranteed 1A operation in harsh thermal environments.
Availability
AS7809ADTR-G1 is available at Aetrix Electronics and suitable for microprocessor power supplies, post-regulation in telecom systems, and motherboard local regulation requiring stable component supply, long-term lifecycle support, and RoHS 3-compliant sourcing.
Supply support for AS7809ADTR-G1 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 for industrial, computing, communications, and consumer markets.
The AS78XXA series targets cost-sensitive, high-reliability linear regulation applications where internal protection, thermal robustness, and environmental compliance are mandatory - especially in telecom infrastructure and embedded control.
FAQ
What is the maximum input voltage for AS7809ADTR-G1?
The absolute maximum input voltage is 36V, but the recommended operating range is up to 32V per the datasheet's Recommended Operating Conditions table. Exceeding 32V risks exceeding safe power dissipation limits even with heatsinking, especially at elevated ambient temperatures or high output currents.
Does AS7809ADTR-G1 require external capacitors?
Yes - a minimum 0.33µF ceramic capacitor on the INPUT pin and 0.1µF ceramic capacitor on the OUTPUT pin are mandatory for stability and transient response. These values are specified in the Typical Applications Circuit and validated across all operating conditions in the datasheet.
Is AS7809ADTR-G1 qualified for automotive use?
No - AS7809ADTR-G1 is not AEC-Q100 qualified. While it meets industrial temperature range (-40°C to +125°C) and RoHS 3 requirements, Diodes explicitly states that automotive-grade versions require separate qualification, PPAP capability, and IATF 16949 manufacturing - none of which apply to this part number.
How does the safe-area protection function in AS7809ADTR-G1?
Safe-area protection dynamically constrains the output transistor's simultaneous voltage and current operation using on-chip sensing and bias networks. It prevents second breakdown by reducing collector current as VCE increases, ensuring the device remains within its SOA curve during overload, start-up, or output short conditions - without relying on external foldback circuitry.
AS7809ADTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 29V
- Voltage - Output (Min/Fixed):
- 9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 61dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252-3
AS7809ADTR-G1 FAQ
1.How can I place an order for AS7809ADTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS7809ADTR-G1 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 AS7809ADTR-G1 reliable?
The price and inventory of AS7809ADTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS7809ADTR-G1 is usually 5 days.
3.What payment methods are accepted for AS7809ADTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS7809ADTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS7809ADTR-G1?
AS7809ADTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS7809ADTR-G1 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 AS7809ADTR-G1?
For technical support, including AS7809ADTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS7809ADTR-G1 requirements.
6.How does Aetrix verify that AS7809ADTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS7809ADTR-G1 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 AS7809ADTR-G1 meets industry standards.
7.What is the process for return or replacement of AS7809ADTR-G1?
All AS7809ADTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS7809ADTR-G1, 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 AS7809ADTR-G1 part is unused and in its original packaging.
Return procedure for AS7809ADTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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