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Diodes Incorporated AZ1085CS-3.3TRG1
- Part No.:
- AZ1085CS-3.3TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
AZ1085CS-3.3TRG1.pdf
- Description:
- IC REG LINEAR 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,332
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Product details
Overview
AZ1085CS-3.3TRG1 from Diodes Incorporated is a 3.3V fixed-output, 3A low-dropout linear regulator in TO263 package with 1.3V typical dropout at full load, thermal shutdown, and current limiting. It delivers stable microprocessor supply voltage for motherboard power rails and post-regulation after switching converters.
For engineers reviewing the AZ1085CS-3.3TRG1 datasheet, AZ1085CS-3.3TRG1 pinout, AZ1085CS-3.3TRG1 application, or AZ1085CS-3.3TRG1 equivalent, this page provides verified specifications, package mapping, thermal performance data, and real-world use context for high-current LDO selection in industrial and telecom power systems.
Technical Context
The AZ1085CS-3.3TRG1 implements a bandgap-referenced error amplifier with internal current-limiting circuitry and thermal shutdown protection. Its architecture supports stable regulation with low-ESR ceramic output capacitors and maintains ±1% output accuracy over 0°C to +125°C junction temperature.
It operates with input voltages up to 12V and requires minimum load current of 3mA (typical) for stability. Dropout voltage remains ≤1.5V across full 3A load and temperature range, enabling efficient operation in battery-powered and high-efficiency linear regulator applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1% (3.234–3.366V), tightly regulated for 3.3V logic and I/O rail compliance |
| Max Output Current | 3A continuous, sufficient for FPGA core or microprocessor VDD supply |
| Dropout Voltage | 1.3V typical at 3A, enables operation with VIN as low as 4.6V for 3.3V output |
| Line Regulation | 0.5mV typical (0.015% typ), ensures minimal output shift under input ripple or variation |
| Load Regulation | 7mV typical (0.1% typ), maintains tight voltage control from no-load to full 3A |
| Thermal Shutdown | Active at TJ ≥ +150°C, protects die during overload or poor heatsinking |
| Quiescent Current | 5–10mA, low enough for standby efficiency but high enough for fast transient response |
Pinout & Package
Package: TO263 (D²PAK), surface-mount, thermally enhanced with exposed tab (pin 3 = GND/thermal pad). Pin 1: INPUT; Pin 2: OUTPUT; Pin 3: ADJ/GND - GND connection required for fixed-output variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | INPUT | Unregulated input supply (4.8–12V); must be decoupled with ≥10µF low-ESR capacitor |
| Pin 2 | OUTPUT | Regulated 3.3V output; connects to load and 22µF ceramic output capacitor |
| Pin 3 | ADJ/GND | GND reference and thermal interface; soldered to PCB copper pour for θJA = 75°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Low ESR capacitor compatibility | Stable with 22µF ceramic output cap (no electrolytic required), reducing board area and aging risk |
| Integrated current limit | 4.5A peak limit prevents damage during short-circuit or inrush, enabling robust system-level protection |
| Lead-free & green packaging | RoHS 3 and halogen-free (Br+Cl <1500ppm, Sb <1000ppm), compliant for global industrial shipments |
| Thermal resistance (θJC) | 6.34°C/W junction-to-case, supports >10W dissipation with proper heatsinking |
Applications
| Microprocessor Power Supply | Motherboard VRM Post-Regulation |
|---|---|
Use Scenario: Providing clean 3.3V supply to ARM Cortex-A series SoCs in embedded gateways. IC Role / Device Role / Timing Role: Primary linear regulator delivering low-noise, low-ripple VDD_IO rail. Use Value: 0.003% RMS noise and 72dB PSRR at 120Hz enable reliable high-speed digital interface timing. |
Use Scenario: Final-stage regulation after multi-phase buck converter on server motherboard. IC Role / Device Role / Timing Role: Low-dropout post-regulator improving transient response and voltage accuracy. Use Value: 7mV load regulation ensures <±10mV deviation across 0–3A load step, meeting Intel VR14 spec margins. |
| Battery Charger Reference | Telecom Line Card Supply |
Use Scenario: Generating precise 3.3V bias for charger IC feedback and ADC reference in portable Li-ion chargers. IC Role / Device Role / Timing Role: Precision voltage source for analog sensing and control loop stability. Use Value: 0.5% temperature stability and 0.5% long-term drift (1000h @125°C) ensure consistent charge termination accuracy. |
Use Scenario: Powering DSPs and SerDes interfaces in optical line cards requiring low-noise 3.3V. IC Role / Device Role / Timing Role: Low-noise LDO supplying clock distribution and signal conditioning circuits. Use Value: 60–72dB PSRR up to 10kHz suppresses switching noise from upstream DC/DC, preventing bit errors. |
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 |
|---|---|---|---|
| APL5323QBI-33 | Higher dropout (1.8V @3A), lower PSRR (55dB), QFN-8 package | Lacks thermal pad; requires more PCB area for heatsinking | Prefer when space-constrained layout favors QFN over D²PAK |
| TLV1117-33CDCY | Lower current (800mA), higher dropout (1.2V @800mA), SO-8 package | Not suitable for >1.5A loads; limited thermal performance | Select only for low-power auxiliary rails where 3A capability is unnecessary |
Compared with APL5323QBI-33 and TLV1117-33CDCY, AZ1085CS-3.3TRG1 uniquely combines 3A output, 1.3V dropout, and D²PAK thermal performance-making it irreplaceable for high-current, thermally demanding linear regulation where alternatives either derate significantly or lack current capacity.
Availability
AZ1085CS-3.3TRG1 is available at Aetrix Electronics and suitable for motherboard power supplies, telecom line cards, microprocessor VDD_IO rails, and battery charger reference circuits requiring stable component supply and long-lifecycle support.
Supply support for AZ1085CS-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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and communications markets.
The AZ1085C series was designed specifically for high-current, low-noise linear regulation in space-constrained and thermally demanding applications-emphasizing dropout minimization, thermal robustness, and compatibility with modern ceramic capacitors.
FAQ
What is the maximum input voltage for AZ1085CS-3.3TRG1?
The absolute maximum input voltage is 13.2V, but recommended operating input voltage is 4.8V to 12V. Exceeding 12V risks exceeding the 1.5V dropout margin and may trigger thermal shutdown under full load due to excessive power dissipation (PD = (VIN − 3.3V) × IOUT).
Can AZ1085CS-3.3TRG1 be used with ceramic output capacitors?
Yes-it is fully compatible with low-ESR ceramic capacitors (e.g., 22µF X5R/X7R), as confirmed in the datasheet's "Compatible with Low ESR Ceramic Capacitor" feature. No series ESR is required, unlike older LDOs, simplifying design and improving reliability.
Is AZ1085CS-3.3TRG1 still in active production?
No-AZ1085C series is marked OBSOLETE in the official datasheet (Rev. 4, Nov 2021). Diodes recommends AZ1084C as the functional replacement. However, AZ1085CS-3.3TRG1 remains available through Aetrix Electronics' legacy inventory with full traceability and extended lifecycle support.
What is the thermal resistance of AZ1085CS-3.3TRG1 in TO263 package?
θJA is 75°C/W (standard JEDEC high-K board), and θJC is 6.34°C/W. With a 4cm² 2-oz copper pour under the exposed tab, practical θJA can reach ~45°C/W, enabling >6W continuous dissipation at TA = 70°C before thermal shutdown activates.
AZ1085CS-3.3TRG1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- 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-263
AZ1085CS-3.3TRG1 FAQ
1.How can I place an order for AZ1085CS-3.3TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085CS-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 AZ1085CS-3.3TRG1 reliable?
The price and inventory of AZ1085CS-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 AZ1085CS-3.3TRG1 is usually 5 days.
3.What payment methods are accepted for AZ1085CS-3.3TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085CS-3.3TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085CS-3.3TRG1?
AZ1085CS-3.3TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085CS-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 AZ1085CS-3.3TRG1?
For technical support, including AZ1085CS-3.3TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085CS-3.3TRG1 requirements.
6.How does Aetrix verify that AZ1085CS-3.3TRG1 is sourced from the original manufacturer or authorized distributors?
All AZ1085CS-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 AZ1085CS-3.3TRG1 meets industry standards.
7.What is the process for return or replacement of AZ1085CS-3.3TRG1?
All AZ1085CS-3.3TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085CS-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 AZ1085CS-3.3TRG1 part is unused and in its original packaging.
Return procedure for AZ1085CS-3.3TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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