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Diodes Incorporated AS7812AT-E1
- Part No.:
- AS7812AT-E1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-3
- Datasheet:
-
AS7812AT-E1.pdf
- Description:
- IC REG LINEAR 12V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:428
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Product details
Overview
AS7812AT-E1 from Diodes Incorporated is a fixed-output +12 V, 1 A three-terminal positive linear voltage regulator in TO-220-3 (Option 1) package with internal current limiting, thermal shutdown, and safe-area protection. It delivers stable regulation for microprocessor power supplies and post-regulation of switching supplies, maintaining ±4% output accuracy over −40 °C to +125 °C with 2 V dropout at 1 A.
For engineers reviewing the AS7812AT-E1 datasheet, AS7812AT-E1 pinout, AS7812AT-E1 application, or AS7812AT-E1 equivalent, key selection criteria include input voltage range (up to 32 V), thermal resistance (θJA = 60 °C/W), quiescent current (3.4–6 mA), ripple rejection (60 dB at 120 Hz), and RoHS-compliant lead-free packaging.
Technical Context
The AS7812AT-E1 implements a monolithic series-pass regulator architecture with built-in short-circuit current limiting, thermal overload protection, and output transistor safe-area compensation. Its internal circuitry ensures immunity to output overload without external components.
It operates across −40 °C to +125 °C junction temperature, supports input voltages up to 32 V for 12 V output, and maintains load regulation within 40–120 mV across 5 mA to 1 A output current at +25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +12 V nominal, ±4% tolerance over full temperature range - ensures stable rail for logic and analog circuits |
| Max Output Current | 1 A continuous - sufficient for local regulation on motherboards and telecom modules |
| Input Voltage Range | 14.8 V to 32 V - compatible with 24 V industrial bus and post-switching supply inputs |
| Dropout Voltage | 2 V at 1 A, +25 °C - defines minimum VIN–VOUT headroom needed for regulation |
| Ripple Rejection | 60 dB at 120 Hz - suppresses low-frequency switching noise from upstream DC/DC converters |
| Quiescent Current | 3.4–6 mA at VIN = 19 V, IOUT = 0 - impacts standby power in always-on systems |
| Thermal Resistance θJA | 60 °C/W (TO-220-3) - determines heatsink requirement for 1 A operation at elevated ambient |
Pinout & Package
AS7812AT-E1 uses the TO-220-3 (Option 1) package: a through-hole, thermally enhanced plastic case with 3 leads and integral heat slug. Mounting tab is electrically connected to Pin 2 (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INPUT | Unregulated DC input; must be ≥14.8 V and ≤32 V for proper regulation |
| 2 | GND | Ground reference and thermal path; tab connection enables heatsinking |
| 3 | OUTPUT | Stabilized +12 V output; requires 0.33 µF input and 0.1 µF output ceramic capacitors |
Key Features
| Feature | Design Value |
|---|---|
| Internal Short-Circuit Protection | Limits output current to ~0.2 A during fault - prevents damage without external foldback circuitry |
| Thermal Shutdown | Activates at +150 °C junction temperature - safeguards against overheating under sustained overload |
| Safe-Area Compensation | Maintains SOA compliance during transient overloads - eliminates need for external SOA limiting |
| Lead-Free & RoHS Compliant | TO-220-3 package with matte tin-plated leads - meets EU Directive 2015/863/EU (RoHS 3) |
| Low Load Regulation | ≤120 mV variation from 5 mA to 1 A load - ensures consistent voltage for mixed-signal loads |
Applications
| Microprocessor Power Supply | Post-Regulation for Switching Supplies |
|---|---|
Use Scenario: Providing clean, low-noise 12 V rail to FPGA I/O banks or MCU peripherals in embedded control units. IC Role / Device Role / Timing Role: Primary local voltage regulator delivering stable 12 V from intermediate 15–24 V bus. Use Value: ±4% output accuracy and 60 dB ripple rejection ensure signal integrity and timing margin for high-speed digital interfaces. |
Use Scenario: Tightening output voltage tolerance and reducing residual switching noise after a 12 V buck converter. IC Role / Device Role / Timing Role: Low-dropout linear post-regulator improving PSRR and transient response of switched-mode supply. Use Value: 2 V dropout and 11 mΩ output resistance enable fast load-step recovery and lower output impedance than standalone DC/DC. |
| Motherboard Local Regulation | Telecommunication Equipment |
Use Scenario: Generating auxiliary 12 V rails for PCIe slot power, fan controllers, or management ASICs on server motherboards. IC Role / Device Role / Timing Role: Distributed point-of-load regulator with integrated thermal protection for dense board layouts. Use Value: TO-220-3 package allows direct heatsink mounting; 60 °C/W θJA supports 1 A delivery in constrained airflow environments. |
Use Scenario: Powering line-card interface ICs, PHYs, and clock buffers in carrier-grade access equipment. IC Role / Device Role / Timing Role: High-reliability linear regulator meeting extended temperature and long-life requirements. Use Value: −40 °C to +125 °C operating range and robust internal protection ensure uptime in uncontrolled cabinet environments. |
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 |
|---|---|---|---|
| LM7812CT/NOPB | Higher quiescent current (5.5–8 mA), wider VOUT tolerance (±2%), higher θJA (65 °C/W in TO-220) | Less suitable for low-power standby modes; requires larger heatsink at 1 A | Prefer AS7812AT-E1 when minimizing no-load power or maximizing thermal margin is critical |
| MC7812CD2TR4G | Lower PSRR (55 dB), same dropout (2 V), RoHS-compliant D2PAK package (θJA = 50 °C/W) | Better thermal performance but higher cost and surface-mount only | Choose AS7812AT-E1 for through-hole assembly, cost-sensitive designs, or legacy TO-220 footprint compatibility |
Compared with LM7812CT/NOPB and MC7812CD2TR4G, AS7812AT-E1 offers tighter quiescent current control, superior ripple rejection, and identical thermal protection-making it optimal for industrial and telecom applications demanding reliability and low standby loss.
Availability
AS7812AT-E1 is available at Aetrix Electronics and suitable for microprocessor power supplies, motherboard local regulation, and telecommunication equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.
Supply support for AS7812AT-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions.
The AS78XXA series targets cost-effective, robust linear regulation for industrial, computing, and communications infrastructure-designed for drop-in replacement of legacy 78xx regulators with enhanced thermal and protection features.
FAQ
What is the maximum input voltage for AS7812AT-E1?
The AS7812AT-E1 supports a maximum input voltage of 32 V under recommended operating conditions. Absolute maximum rating is 36 V, but operation above 32 V risks exceeding safe power dissipation limits and triggering thermal shutdown, especially at high ambient temperatures or without adequate heatsinking.
Does AS7812AT-E1 require external capacitors?
Yes. A 0.33 µF ceramic capacitor is required between INPUT and GND, and a 0.1 µF ceramic capacitor between OUTPUT and GND. These stabilize internal feedback and prevent oscillation. Larger bulk capacitance may be added externally for improved transient response, but the specified values are mandatory for stability per the datasheet.
Is AS7812AT-E1 pin-compatible with standard 7812 regulators?
Yes. AS7812AT-E1 uses TO-220-3 (Option 1) pinout: Pin 1 = INPUT, Pin 2 = GND, Pin 3 = OUTPUT - identical to industry-standard 78xx regulators. No PCB layout changes are needed for drop-in replacement, provided thermal design accommodates its 60 °C/W θJA.
What protection features does AS7812AT-E1 include?
AS7812AT-E1 integrates three core protections: (1) internal short-circuit current limiting (~0.2 A), (2) thermal shutdown at +150 °C junction temperature, and (3) output transistor safe-area compensation. These operate autonomously without external components and reset automatically once fault conditions subside.
AS7812AT-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):
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-3
AS7812AT-E1 FAQ
1.How can I place an order for AS7812AT-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS7812AT-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 AS7812AT-E1 reliable?
The price and inventory of AS7812AT-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS7812AT-E1 is usually 5 days.
3.What payment methods are accepted for AS7812AT-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS7812AT-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS7812AT-E1?
AS7812AT-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS7812AT-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 AS7812AT-E1?
For technical support, including AS7812AT-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS7812AT-E1 requirements.
6.How does Aetrix verify that AS7812AT-E1 is sourced from the original manufacturer or authorized distributors?
All AS7812AT-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 AS7812AT-E1 meets industry standards.
7.What is the process for return or replacement of AS7812AT-E1?
All AS7812AT-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AS7812AT-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 AS7812AT-E1 part is unused and in its original packaging.
Return procedure for AS7812AT-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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