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Diodes Incorporated AZ1085D-3.3TRG1
- Part No.:
- AZ1085D-3.3TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
AZ1085D-3.3TRG1.pdf
- Description:
- IC REG LINEAR 3.3V 3A TO252-2
- Quantity:
- Payment:
- Shipping:
Inventory:4,107
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Product details
Overview
AZ1085D-3.3TRG1 from BCD Semiconductor Manufacturing Limited is a fixed-output 3.3V, 3A low dropout linear regulator in TO-252-2 (DPAK) package with 1.3V typical dropout at full load, integrated thermal shutdown and current limiting, and ±1% output voltage accuracy over temperature and load - deployed in motherboard power supplies and telecom equipment where stable post-regulation is required.
For engineers reviewing the AZ1085D-3.3TRG1 datasheet, AZ1085D-3.3TRG1 pinout, AZ1085D-3.3TRG1 application, or AZ1085D-3.3TRG1 equivalent, key selection criteria include dropout voltage at 3A, thermal resistance (θJA = 100°C/W), load regulation (≤15 mV), and compatibility with standard DPAK PCB footprints across TO-252-2 variants (1)–(4).
Technical Context
The AZ1085D-3.3TRG1 implements a bandgap-referenced error amplifier driving a PNP pass transistor, enabling low dropout operation without external compensation. Its internal current limit (4.5A) and thermal protection activate independently to prevent damage during overload or high ambient conditions.
Designed for fixed 3.3V output, it integrates precision feedback resistors and requires no external adjustment components. It operates across 0–125°C junction temperature with input voltage range 4.8–8V and supports ripple rejection of 72dB at 120Hz with 25µF output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1% (3.234–3.366V) at 10mA–3A load, ensuring compatibility with 3.3V logic rails and PCIe/USB interface supplies. |
| Dropout Voltage | 1.3V typical at 3A (max 1.5V), enabling operation from 4.8V input while maintaining regulation under full load. |
| Output Current | 3A continuous, supporting high-current FPGA I/O banks or microprocessor core auxiliary rails. |
| Line Regulation | 0.5–1 mV over 4.8–10V input, minimizing output drift during upstream supply variation. |
| Load Regulation | ≤15 mV from 0–3A load step, critical for stable DDR memory termination or analog subsystem biasing. |
| Thermal Resistance θJA | 100°C/W (TO-252-2 package), requiring ≥2 cm² copper pour for 3A operation at 70°C ambient. |
| Ripple Rejection | 72dB at 120Hz with 25µF ceramic output cap, suppressing switching noise from preceding DC/DC stages. |
Pinout & Package
Package: TO-252-2 (DPAK), surface-mount, single-row 3-pin configuration with exposed thermal pad (pin 2). Compatible with JEDEC MO-263 footprint variants (1)–(4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INPUT | Unregulated input supply (4.8–8V); must be decoupled with ≥10µF low-ESR capacitor near pin. |
| 2 | OUTPUT | Regulated 3.3V output; connects directly to load and output capacitor (≥22µF ceramic + bulk electrolytic). |
| 3 | GND | Power ground reference; tied to thermal pad and system ground plane for optimal thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 1.3V at 3A enables use with 5V intermediate bus, reducing power loss vs. legacy 78xx regulators. |
| Integrated Protection | Thermal shutdown and 4.5A current limit eliminate need for external foldback or thermal sensors. |
| Fixed Output Accuracy | ±1% over 0–125°C ensures reliable 3.3V rail compliance for industrial-grade SoCs and PHYs. |
| Green & Lead-Free | "G1" suffix denotes RoHS-compliant green molding compound and lead-free terminations (Pb-free plating). |
| Tape-and-Reel Packaging | "TRG1" indicates 1000-unit tape-and-reel format optimized for automated SMT placement. |
Applications
| Microprocessor Supply | Motherboard Power Supplies |
|---|---|
Use Scenario: Providing clean 3.3V auxiliary power to ARM Cortex-A series SoC I/O domains and PCIe controller logic. IC Role / Device Role / Timing Role: Post-regulator after buck converter, delivering low-noise, tightly regulated voltage with fast transient response. Use Value: Maintains <15mV load regulation during CPU burst currents up to 3A, preventing logic errors or interface resets. |
Use Scenario: Generating stable 3.3V rail for chipset management controllers, SMBus interfaces, and BIOS flash memory on ATX motherboards. IC Role / Device Role / Timing Role: Primary LDO for always-on subsystems requiring guaranteed startup and brownout immunity. Use Value: Delivers ±1% output accuracy across -20°C to +70°C ambient, meeting Intel VRD spec for standby rails. |
| Telecom Equipment | DVD-Video Player |
Use Scenario: Powering Ethernet PHYs, SFP+ transceivers, and clock buffers in carrier-grade access switches. IC Role / Device Role / Timing Role: Low-noise local regulator isolating sensitive analog timing circuits from noisy digital backplanes. Use Value: 72dB PSRR at 120Hz suppresses switching ripple from shared 5V DC/DC, preserving jitter performance. |
Use Scenario: Supplying 3.3V to DVD laser driver ICs, video DACs, and MPEG decoder ASICs in consumer optical drives. IC Role / Device Role / Timing Role: Cost-optimized fixed-output LDO replacing adjustable regulators in space-constrained designs. Use Value: TO-252-2 footprint allows direct replacement of older 3.3V regulators without PCB redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3.3V, 3A LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM1085IT-3.3/NOPB | Higher dropout (1.5V typ at 3A), θJA = 65°C/W (TO-220), no green package option. | Requires larger heatsink for same ambient; less suitable for compact telecom modules. | Select if TO-220 mounting is preferred and higher thermal margin is available. |
| AP1185-33SG-13 | Same TO-252-2 package, but 1.2V dropout (typ), lower quiescent current (3mA), no integrated current limit. | Lacks cycle-by-cycle current limiting; relies on external OCP for short-circuit protection. | Choose when ultra-low dropout and efficiency outweigh need for autonomous fault protection. |
Compared with LM1085IT-3.3/NOPB, AZ1085D-3.3TRG1 offers better thermal performance in DPAK layout and RoHS/green compliance; versus AP1185-33SG-13, it trades 0.1V higher dropout for built-in current limiting and wider input range (up to 12V).
Availability
AZ1085D-3.3TRG1 is available at Aetrix Electronics and suitable for motherboard power supplies, telecom equipment, and DVD-video player designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for AZ1085D-3.3TRG1 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
BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and power IC foundry specializing in high-voltage, high-current linear and switching regulators for industrial and communications markets.
The AZ1085 series targets cost-sensitive, high-reliability linear regulation applications where thermal robustness, fixed-output simplicity, and DPAK/SOT-223 footprint compatibility are prioritized over ultra-low IQ or digital programmability.
FAQ
What is the maximum input voltage for AZ1085D-3.3TRG1?
The absolute maximum input voltage is 12V per datasheet Absolute Maximum Ratings. For reliable operation, the recommended input range is 4.8V to 8V - sufficient to maintain 3.3V output with 1.5V dropout margin while avoiding excessive power dissipation at 3A load.
Does AZ1085D-3.3TRG1 require an external capacitor on the ADJ/GND pin?
No - the "D-3.3" variant is a fixed-output version with internal feedback resistors; pin 3 is GND, not ADJ. External capacitors are required only on INPUT (≥10µF) and OUTPUT (≥22µF ceramic + optional bulk electrolytic), per Figure 18 in the datasheet.
How does thermal shutdown behave under sustained overload?
When junction temperature exceeds ~150°C, the device enters thermal shutdown, disabling the pass transistor until die temperature falls by ~15°C. Recovery is automatic and does not require power cycle; this protects against permanent damage during prolonged short-circuit or inadequate heatsinking.
Can AZ1085D-3.3TRG1 be paralleled for higher current?
No - the AZ1085D-3.3TRG1 lacks current-sharing capability or master/slave control. Paralleling without external ballast resistors causes unequal current distribution and potential thermal runaway. For >3A, select a higher-current LDO or switch to multiphase DC/DC architecture.
AZ1085D-3.3TRG1 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):
- 12V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.5V @ 3A
- Current - Output:
- 3A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 72dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252-3
AZ1085D-3.3TRG1 FAQ
1.How can I place an order for AZ1085D-3.3TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085D-3.3TRG1 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 AZ1085D-3.3TRG1 reliable?
The price and inventory of AZ1085D-3.3TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1085D-3.3TRG1 is usually 5 days.
3.What payment methods are accepted for AZ1085D-3.3TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085D-3.3TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085D-3.3TRG1?
AZ1085D-3.3TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085D-3.3TRG1 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 AZ1085D-3.3TRG1?
For technical support, including AZ1085D-3.3TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085D-3.3TRG1 requirements.
6.How does Aetrix verify that AZ1085D-3.3TRG1 is sourced from the original manufacturer or authorized distributors?
All AZ1085D-3.3TRG1 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 AZ1085D-3.3TRG1 meets industry standards.
7.What is the process for return or replacement of AZ1085D-3.3TRG1?
All AZ1085D-3.3TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085D-3.3TRG1, 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 AZ1085D-3.3TRG1 part is unused and in its original packaging.
Return procedure for AZ1085D-3.3TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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