My Inquiry
My Account
Diodes Incorporated AS7812ADTR-E1
- Part No.:
- AS7812ADTR-E1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
AS7812ADTR-E1.pdf
- Description:
- IC REG LINEAR 12V 1A TO252-2
- Quantity:
- Payment:
- Shipping:
Inventory:4,427
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AS7812ADTR-E1 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 and post-regulation after switching converters.
For engineers reviewing the AS7812ADTR-E1 datasheet, AS7812ADTR-E1 pinout, AS7812ADTR-E1 application, or AS7812ADTR-E1 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-E1 implements a monolithic series-pass regulator architecture with integrated bandgap reference, error amplifier, and Darlington pass transistor. Its internal safe-area compensation ensures stable operation under transient overload without external components.
It operates across input voltages from 14.8 V to 32 V and maintains regulated output under full-load (1 A) conditions up to +125°C junction temperature, with quiescent current tightly specified at 3.4–6 mA and low output noise (10 µV/√Hz).
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 accuracy. |
| Max Output Current | 1 A continuous - supports mid-power digital subsystems and peripheral ICs without external current boosting. |
| Dropout Voltage | 2 V at 1 A, 25°C - defines minimum VIN–VOUT headroom needed to sustain regulation; impacts efficiency in low-headroom designs. |
| Ripple Rejection | 60 dB at 120 Hz - suppresses switching supply ripple and line harmonics, critical for noise-sensitive analog circuitry. |
| Line Regulation | 25–120 mV over VIN = 14.8–27 V - quantifies output stability against input variation; lower values reduce need for upstream filtering. |
| Load Regulation | 40–120 mV over IOUT = 5 mA–1 A - determines output deviation during dynamic load steps; affects voltage margining in multi-rail systems. |
| Thermal Resistance θJA | 100 °C/W (TO-252-2) - sets PCB copper area and heatsinking requirements for safe 1 A operation at ambient ≤75°C. |
Pinout & Package
AS7812ADTR-E1 is housed in a surface-mount TO-252-2 (5) / TO252 (Type CJ) package with exposed thermal pad for enhanced heat dissipation. The device uses standard 3-pin configuration optimized for high-current linear regulation on compact PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Voltage Input | Accepts unregulated DC input (14.8–32 V); requires ≥0.33 µF ceramic bypass capacitor close to pin for stability. |
| 2 (GND) | Ground Reference | Common return path for input and output circuits; must be low-impedance connection to minimize noise coupling. |
| 3 (OUTPUT) | Voltage Output | Delivers regulated +12 V; requires ≥0.1 µF ceramic output capacitor for transient response and loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +12 V output | Eliminates external resistor network, reducing BOM count and layout complexity for dedicated 12 V rail generation. |
| ±4% output accuracy | Guarantees compliance with industrial 12 V tolerance bands (11.5–12.5 V) across full temperature and load range. |
| Internal thermal shutdown | Automatically disables output above +150°C junction temperature, preventing catastrophic failure during overload or poor heatsinking. |
| Safe-area protected pass transistor | Prevents second breakdown during output short-circuit or capacitive load transients without external foldback circuitry. |
| Lead-free & "Green" packaging | TO-252-2 (5) meets RoHS 3 and halogen/antimony-free requirements (<900 ppm Br/Cl, <1000 ppm Sb), supporting eco-compliant manufacturing. |
Applications
| Microprocessor Power Supply | Post-Regulation for Switching Supplies |
|---|---|
|
Use Scenario: Providing clean, low-noise 12 V bias to FPGA I/O banks or MCU peripherals in embedded control units. IC Role / Device Role: Final-stage linear regulator delivering tightly regulated voltage after buck converter. Use Value: 60 dB ripple rejection attenuates switching noise from upstream DC/DC, preserving signal integrity in high-speed digital interfaces. |
Use Scenario: Stabilizing output of 12 V switching regulator feeding analog sensors and precision ADCs in industrial data acquisition modules. IC Role / Device Role: Low-noise linear post-regulator improving PSRR and reducing output voltage drift. Use Value: ±4% output accuracy and 10 µV/√Hz noise ensure stable reference voltage for 16-bit ADCs without additional filtering. |
| Motherboard Local Regulation | Telecom Line Card Power |
|
Use Scenario: On-board 12 V rail generation for PCIe slot auxiliary power or fan controllers in server motherboards. IC Role / Device Role: Distributed point-of-load regulator minimizing IR drop and EMI from centralized PSU. Use Value: 1 A capability and TO-252 thermal performance enable direct mounting near high-current loads without heatsink. |
Use Scenario: Powering 12 V interface ICs (e.g., RS-485 transceivers, clock buffers) on telecom line cards with strict thermal constraints. IC Role / Device Role: Compact, thermally efficient linear regulator meeting NEBS GR-63-CORE airflow-limited cooling profiles. Use Value: 100 °C/W θJA and lead-free "Green" package support convection-cooled designs compliant with telecom environmental standards. |
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-TR | Higher quiescent current (5.5–8 mA), wider output tolerance (±2%), higher θJA (120 °C/W in TO-252). | Less suitable for low-power standby modes; requires larger PCB copper for same thermal performance. | Select when legacy LM78xx footprint compatibility is required and tighter initial accuracy is acceptable. |
| MC7812BDTRKG | Lower dropout (1.7 V), better line regulation (12 mV), but only ±2% output tolerance and no "Green" certification. | Better for low-headroom inputs; lacks halogen-free compliance needed for EU telecom deployments. | Choose for higher efficiency in battery-backed systems where RoHS 3 and halogen-free status are not mandated. |
Compared with LM7812CDT-TR and MC7812BDTRKG, AS7812ADTR-E1 offers superior thermal resistance management in TO-252, guaranteed RoHS 3 and "Green" compliance, and tighter load regulation-making it optimal for space-constrained, thermally demanding, and environmentally regulated industrial applications.
Availability
AS7812ADTR-E1 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 assurance, and RoHS 3-compliant sourcing.
Supply support for AS7812ADTR-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 for industrial, computing, and communications markets.
The AS78XXA series targets cost-sensitive, thermally constrained linear regulation applications where robustness, fixed-voltage simplicity, and environmental compliance are prioritized over adjustable output or ultra-low IQ.
FAQ
What is the maximum input voltage for AS7812ADTR-E1?
The absolute maximum input voltage is 36 V, but the recommended operating range is 14.8 V to 32 V per the datasheet's Recommended Operating Conditions table. Exceeding 32 V risks violating safe operating area limits and may trigger thermal shutdown under load.
Does AS7812ADTR-E1 require external capacitors?
Yes: a minimum 0.33 µF ceramic capacitor on the INPUT pin and 0.1 µF on the OUTPUT pin are mandatory for stability. Larger values (e.g., 10 µF tantalum on output) improve transient response but do not replace the required ceramics.
Is AS7812ADTR-E1 qualified for automotive use?
No - AS7812ADTR-E1 is not AEC-Q100 qualified. Diodes states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for industrial and commercial applications only.
How does the TO-252-2 (5) package affect thermal performance?
The TO-252-2 (5) package has θJA = 100 °C/W (vs. 60 °C/W for TO-220-3), meaning it relies heavily on PCB copper area for heat spreading. A 1-inch² 2-oz copper pour under the exposed pad reduces effective θJA by ~30%, enabling full 1 A operation at 75°C ambient.
AS7812ADTR-E1 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):
- 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-E1 FAQ
1.How can I place an order for AS7812ADTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS7812ADTR-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 AS7812ADTR-E1 reliable?
The price and inventory of AS7812ADTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS7812ADTR-E1 is usually 5 days.
3.What payment methods are accepted for AS7812ADTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS7812ADTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS7812ADTR-E1?
AS7812ADTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS7812ADTR-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 AS7812ADTR-E1?
For technical support, including AS7812ADTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS7812ADTR-E1 requirements.
6.How does Aetrix verify that AS7812ADTR-E1 is sourced from the original manufacturer or authorized distributors?
All AS7812ADTR-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 AS7812ADTR-E1 meets industry standards.
7.What is the process for return or replacement of AS7812ADTR-E1?
All AS7812ADTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AS7812ADTR-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 AS7812ADTR-E1 part is unused and in its original packaging.
Return procedure for AS7812ADTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS7812ADTR-E1 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
