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Diodes Incorporated AS7812ADTR-G1
- Part No.:
- AS7812ADTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
AS7812ADTR-G1.pdf
- Description:
- IC REG LINEAR 12V 1A TO252-2
- Quantity:
- Payment:
- Shipping:
Inventory:6,312
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Product details
Overview
AS7812ADTR-G1 from Diodes Incorporated is a fixed-output +12 V, 1 A three-terminal positive linear voltage regulator in TO-252-2 (5) / TO252 (Type CJ) package, featuring ±4% output voltage accuracy over –40°C to +125°C, internal short-circuit current limiting, thermal shutdown, and safe-area protection. It delivers stable local regulation for microprocessor power supplies, post-regulation after switching converters, and telecom infrastructure boards.
For engineers reviewing the AS7812ADTR-G1 datasheet, AS7812ADTR-G1 pinout, AS7812ADTR-G1 application, or AS7812ADTR-G1 equivalent, key selection criteria include dropout voltage (2 V at 1 A), load regulation (40–120 mV), ripple rejection (60 dB at 120 Hz), and thermal resistance (100 °C/W for TO-252-2).
Technical Context
The AS7812ADTR-G1 implements a monolithic series-pass regulator architecture with built-in current limiting, thermal overload protection, and output transistor safe-area compensation. Its internal circuitry ensures immunity to sustained output overload without external components.
It operates across an input voltage range of 14.8 V to 32 V and maintains regulated +12 V output under load currents from 5 mA to 1 A, with quiescent current as low as 3.4 mA and output noise of 10 µV/VO (10 Hz–100 kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +12 V nominal, ±4% tolerance over full temperature range - ensures compatibility with 12 V logic and analog rails requiring tight DC stability. |
| Max Output Current | 1 A continuous - supports mid-power digital subsystems and peripheral ICs without external pass transistors. |
| Dropout Voltage | 2 V at 1 A, TJ = +25°C - defines minimum headroom needed between input and output for regulation. |
| Ripple Rejection | 60 dB at 120 Hz - suppresses low-frequency switching noise from upstream DC/DC converters. |
| Line Regulation | 25–120 mV over VIN = 14.8–27 V - limits output variation due to input supply fluctuations. |
| Load Regulation | 40–120 mV over IOUT = 5 mA–1 A - ensures stable voltage delivery across dynamic load conditions. |
| Thermal Resistance θJA | 100 °C/W (TO-252-2) - determines required PCB copper area and heatsinking for 1 A operation at elevated ambient. |
Pinout & Package
AS7812ADTR-G1 is supplied in a surface-mount TO-252-2 (5) / TO252 (Type CJ) package with exposed thermal pad for enhanced heat dissipation. The device features three terminals arranged in standard front-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Voltage Input | Accepts unregulated DC input (14.8–32 V); must be decoupled with ≥0.33 µF ceramic capacitor close to pin. |
| 2 (GND) | Ground Reference | Common return path for input and output; connects to PCB ground plane and thermal pad for thermal conduction. |
| 3 (OUTPUT) | Voltage Output | Delivers regulated +12 V; requires ≥0.1 µF ceramic output capacitor for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +12 V output | Eliminates external resistor network; reduces BOM count and layout complexity for dedicated 12 V rails. |
| Internal thermal shutdown | Activates at +150°C junction temperature to prevent damage during overload or insufficient heatsinking. |
| Safe-area protected output transistor | Prevents secondary breakdown under simultaneous high voltage and current stress, improving reliability in transient conditions. |
| Lead-free & "Green" packaging | TO-252-2 (5) meets RoHS 3 and halogen/antimony-free requirements (<900 ppm Br/Cl, <1000 ppm Sb). |
| Low quiescent current | 3.4–6 mA at no load - minimizes standby power loss in always-on systems. |
Applications
| Microprocessor Power Supply | Post-Regulation for Switching Supplies |
|---|---|
|
Use Scenario: Providing clean, low-noise 12 V bias to FPGA I/O banks or microcontroller peripherals. IC Role / Device Role / Timing Role: Local point-of-load regulator replacing bulk 12 V distribution with improved PSRR and transient response. Use Value: Reduces voltage deviation to ≤120 mV under 1 A step load, enabling reliable operation of sensitive digital interfaces. |
Use Scenario: Filtering residual ripple from a 15 V buck converter feeding analog sensor signal chains. IC Role / Device Role / Timing Role: Linear post-regulator suppressing low-frequency switching artifacts before precision ADC references. Use Value: Delivers 60 dB ripple attenuation at 120 Hz, lowering output noise to 10 µV/VO for sub-mV measurement accuracy. |
| Motherboard Local Regulation | Telecom Line Card Power |
|
Use Scenario: Generating auxiliary 12 V rail for PCIe slot power management ICs on server motherboards. IC Role / Device Role / Timing Role: Compact, thermally robust regulator mounted near load to minimize IR drop and EMI. Use Value: TO-252-2 package enables 1 A delivery with 100 °C/W θJA, supporting dense board layouts without discrete heatsinks. |
Use Scenario: Powering line interface circuits (e.g., SLIC, codec) in carrier-grade access equipment operating at 55°C ambient. IC Role / Device Role / Timing Role: High-reliability linear regulator with thermal shutdown and safe-area protection for extended field life. Use Value: Maintains ±4% output accuracy from –40°C to +125°C junction, ensuring consistent performance across environmental extremes. |
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 |
|---|---|---|---|
| LM7812CDT/NOPB (TI) | TO-252-3 package; 2% initial output tolerance; higher IQ (6.5 mA typical); θJA = 120 °C/W. | Requires tighter input voltage control due to lower dropout margin; less suitable for high-ambient telecom use. | Select when tighter initial accuracy is prioritized over thermal performance in moderate-temperature environments. |
| MC7812BDTRKG (ON Semi) | TO-252-3; ±2% output tolerance; 1.5 V dropout at 1 A; θJA = 110 °C/W; not "Green" certified. | Higher dropout enables wider input range but reduces efficiency; lacks halogen-free compliance for eco-sensitive designs. | Choose for legacy compatibility where RoHS 3 and halogen-free status are not mandated. |
Compared with LM7812CDT/NOPB and MC7812BDTRKG, AS7812ADTR-G1 offers superior thermal resistance (100 °C/W vs. ≥110 °C/W), guaranteed "Green" compliance, and integrated safe-area protection-making it optimal for space-constrained, high-reliability, and environmentally regulated applications.
Availability
AS7812ADTR-G1 is available at Aetrix Electronics and suitable for microprocessor power supplies, post-regulation for switching supplies, and telecom line card power requiring stable component supply, long-term lifecycle support, and RoHS 3-compliant sourcing.
Supply support for AS7812ADTR-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and communications markets.
The AS78XXA series was developed to deliver cost-effective, thermally robust, and environmentally compliant linear regulation for local point-of-load applications where simplicity, safety, and regulatory adherence are critical.
FAQ
What is the minimum input voltage required for AS7812ADTR-G1 to maintain regulation at 1 A?
The recommended minimum input voltage is 14.8 V, per the datasheet's Recommended Operating Conditions. This accounts for the 2 V dropout voltage at 1 A and ensures stable +12 V output across temperature and load variations. Operation below this risks loss of regulation, especially at high junction temperatures.
Can AS7812ADTR-G1 be used without an input bypass capacitor?
No. A minimum 0.33 µF ceramic capacitor must be placed as close as possible to the INPUT and GND pins. Omitting it risks instability, oscillation, and degraded line regulation-particularly under fast input transients or high-frequency noise coupling.
Is the TO-252-2 (5) package thermally compatible with standard reflow profiles?
Yes. AS7812ADTR-G1 is rated for JEDEC Level 3 moisture sensitivity and supports standard lead-free reflow profiles (peak 260°C for 10 seconds). The exposed thermal pad must be soldered to a solid copper pour for effective heat transfer and mechanical reliability.
Does AS7812ADTR-G1 support reverse-polarity input protection?
No. The device lacks internal reverse-voltage protection. Applying negative voltage to the INPUT pin relative to GND may cause irreversible damage. An external series diode or MOSFET-based protection circuit is required in systems prone to input polarity reversal.
AS7812ADTR-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:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 32V
- Voltage - Output (Min/Fixed):
- 12V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 6 mA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (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
AS7812ADTR-G1 FAQ
1.How can I place an order for AS7812ADTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS7812ADTR-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 AS7812ADTR-G1 reliable?
The price and inventory of AS7812ADTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS7812ADTR-G1 is usually 5 days.
3.What payment methods are accepted for AS7812ADTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS7812ADTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS7812ADTR-G1?
AS7812ADTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS7812ADTR-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 AS7812ADTR-G1?
For technical support, including AS7812ADTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS7812ADTR-G1 requirements.
6.How does Aetrix verify that AS7812ADTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS7812ADTR-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 AS7812ADTR-G1 meets industry standards.
7.What is the process for return or replacement of AS7812ADTR-G1?
All AS7812ADTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS7812ADTR-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 AS7812ADTR-G1 part is unused and in its original packaging.
Return procedure for AS7812ADTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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