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Diodes Incorporated AZ1085CS2-3.3TRE1
- Part No.:
- AZ1085CS2-3.3TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
AZ1085CS2-3.3TRE1.pdf
- Description:
- IC REG LINEAR 3.3V 3A TO263-2
- Quantity:
- Payment:
- Shipping:
Inventory:4,154
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Product details
Overview
AZ1085CS2-3.3TRE1 from Diodes Incorporated is a 3A low-dropout linear regulator with fixed 3.3V output, TO263-2 package, 1.3V typical dropout at full load, integrated thermal shutdown and current limiting, used for post-regulation in switching power supplies and microprocessor core voltage delivery.
For engineers reviewing the AZ1085CS2-3.3TRE1 datasheet, AZ1085CS2-3.3TRE1 pinout, AZ1085CS2-3.3TRE1 application, or AZ1085CS2-3.3TRE1 equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and electrical behavior across temperature, and real-world substitution guidance for legacy design continuity.
Technical Context
The AZ1085CS2-3.3TRE1 implements a bandgap-referenced error amplifier driving a PNP pass transistor, enabling stable regulation with minimal headroom. Its internal current limit (4.5A) and thermal shutdown activate independently to protect under overload or ambient overheating conditions.
It operates over 0°C to +125°C junction temperature with ≤0.1% typical load regulation and 0.015% line regulation, supporting ceramic output capacitors ≥10µF. The TO263-2 package provides θJA = 75°C/W and θJC = 6.34°C/W for predictable thermal management in high-current PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% (3.234–3.366V), ensuring compatibility with 3.3V logic and I/O rails without external feedback components. |
| Max Output Current | 3A continuous, sufficient for powering mid-tier microprocessors, FPGAs, and SoC subsystems requiring clean, low-noise DC supply. |
| Dropout Voltage | 1.3V typical at 3A, enabling operation from 4.6V input - critical for battery-powered systems where input voltage sags near regulation threshold. |
| Thermal Protection | On-chip thermal shutdown activates at TJ ≥ +150°C, preventing permanent damage during sustained overload or poor heatsinking. |
| Load Regulation | ≤7mV (0.1% typ) from 0–3A, minimizing voltage sag during dynamic CPU load transitions in embedded computing applications. |
| PSRR | 72dB at 120Hz, effectively suppressing ripple from upstream switching converters in hybrid power architectures. |
| Quiescent Current | 5–10mA, balancing low-noise performance with standby power efficiency in always-on subsystems. |
Pinout & Package
TO263-2 package: surface-mount, 3-pin, exposed thermal pad (Tab), RoHS-compliant lead-free construction. Thermal pad must be soldered to PCB copper for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Input voltage supply connection | Accepts 4.8–8V input; requires ≥10µF low-ESR ceramic capacitor placed within 5mm of pin for stability and transient response. |
| 2 (OUTPUT) | Regulated 3.3V output node | Delivers up to 3A; connects directly to load; output capacitor ≥22µF recommended for load step immunity. |
| 3 (GND) | Ground reference and thermal tab | Common return path; Tab is electrically connected to GND and serves as primary thermal conduction path to PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Low ESR capacitor compatible | Stable with ≥10µF ceramic output capacitors - eliminates need for bulky, aging-prone electrolytics and reduces board area. |
| Integrated current limiting | 4.5A foldback limit prevents destructive current surges during short-circuit events without external sensing circuitry. |
| Lead-free & halogen-free | RoHS 3 and "Green" compliant (Br+Cl <1500ppm, Sb <1000ppm), meeting global environmental compliance requirements for industrial and telecom equipment. |
| Wide operating temperature | 0°C to +125°C junction range supports deployment in uncooled industrial enclosures and automotive under-hood auxiliary modules. |
Applications
| Microprocessor Core Supply | Battery Charger Post-Regulator |
|---|---|
Use Scenario: Providing clean, low-noise 3.3V supply to ARM Cortex-M7 MCU cores during burst-mode execution. IC Role / Device Role / Timing Role: Primary voltage regulator delivering stable VDD_IO and VDD_AON rails with fast transient response to load steps. Use Value: Maintains <7mV output deviation under 0→3A load transients, preventing logic errors or brownout resets in real-time control firmware. |
Use Scenario: Final-stage regulation after buck converter in USB-C PD charger for portable medical devices. IC Role / Device Role / Timing Role: Low-noise LDO filtering switching ripple before sensitive analog sensor front-ends and ADC references. Use Value: 72dB PSRR at 120Hz suppresses residual switching noise, improving ADC ENOB by ≥1.2 bits in 12-bit medical signal chains. |
| Telecom Line Card Power | DVD/Blu-ray Player AV Subsystem |
Use Scenario: Powering FPGA configuration memory and SerDes bias circuits on carrier-grade optical line cards. IC Role / Device Role / Timing Role: Secondary regulator deriving 3.3V from 5V intermediate bus, providing isolated, low-ripple supply for timing-critical interfaces. Use Value: 0.015% line regulation ensures stable voltage despite ±5% input bus variation, preserving PCIe Gen3 link integrity. |
Use Scenario: Supplying video DAC, HDMI PHY, and audio codec in consumer DVD players with compact thermal constraints. IC Role / Device Role / Timing Role: Compact, thermally efficient 3.3V source replacing larger TO220 regulators in space-constrained optical drive assemblies. Use Value: TO263-2 footprint and 75°C/W θJA enable full 3A operation with only 25mm² copper pour, reducing BOM cost vs. heatsinked alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2303WG-7 | 2.5A max output, 0.6V dropout at 2.5A, SOT-223 package, no integrated thermal shutdown. | Limited to lower-current digital I/O rails; unsuitable for >2.5A loads or environments exceeding 85°C ambient. | Select only for cost-sensitive, low-power applications where thermal margin and current headroom are non-critical. |
| TLV1117-33CDCYR | 800mA max output, 1.2V dropout at 800mA, SOT-223, built-in thermal and overcurrent protection. | Applicable only for peripheral logic rails; cannot replace AZ1085CS2-3.3TRE1 in main processor or FPGA supply roles. | Use exclusively for auxiliary 3.3V domains (e.g., UART, SPI peripherals) where current demand remains below 700mA. |
Compared with AP2303WG-7 and TLV1117-33CDCYR, AZ1085CS2-3.3TRE1 uniquely supports 3A continuous load with robust thermal protection in a thermally optimized TO263-2 package - making it irreplaceable in high-current, high-reliability linear regulation roles where dropout, stability, and fault resilience are jointly constrained.
Availability
AZ1085CS2-3.3TRE1 is available at Aetrix Electronics and suitable for microprocessor core supply, telecom line card power, and DVD/Blu-ray player AV subsystems requiring stable component supply amid end-of-life transitions.
Supply support for AZ1085CS2-3.3TRE1 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and connectivity applications.
The AZ1085C series was designed for high-current, low-noise linear regulation in space-constrained industrial and consumer systems where reliability under thermal stress is essential.
FAQ
Is AZ1085CS2-3.3TRE1 still in active production?
No - Diodes Incorporated has discontinued the AZ1085C series. AZ1085CS2-3.3TRE1 is obsolete per DS36735 Rev. 4 (November 2021). Aetrix Electronics maintains limited legacy stock and supports last-time buys with full traceability and extended warranty for ongoing production ramps.
Can AZ1085CS2-3.3TRE1 be replaced with AZ1084C-3.3TRE1?
Yes - AZ1084C-3.3TRE1 is Diodes' designated functional replacement: same 3A rating, 3.3V output, TO263-2 package, and improved 1.2V dropout. Pinout and thermal characteristics are identical; no PCB redesign is required for drop-in substitution.
What is the minimum input voltage required for stable 3.3V output at 3A?
The minimum input voltage is 4.6V: derived from VOUT + VDROP(min) = 3.3V + 1.3V (typical dropout at 3A). At worst-case 1.5V dropout (per datasheet limit), VIN must be ≥4.8V to guarantee regulation across temperature and process variation.
Does the TO263-2 package require thermal vias under the exposed tab?
Yes - the GND-connected thermal tab must be soldered to ≥25mm² of inner-layer copper pour with ≥6 thermal vias (0.3mm diameter, filled) to achieve rated 3A performance. Without this, junction temperature exceeds +125°C at full load, triggering thermal shutdown.
AZ1085CS2-3.3TRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- 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
AZ1085CS2-3.3TRE1 FAQ
1.How can I place an order for AZ1085CS2-3.3TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085CS2-3.3TRE1 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 AZ1085CS2-3.3TRE1 reliable?
The price and inventory of AZ1085CS2-3.3TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1085CS2-3.3TRE1 is usually 5 days.
3.What payment methods are accepted for AZ1085CS2-3.3TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085CS2-3.3TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085CS2-3.3TRE1?
AZ1085CS2-3.3TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085CS2-3.3TRE1 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 AZ1085CS2-3.3TRE1?
For technical support, including AZ1085CS2-3.3TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085CS2-3.3TRE1 requirements.
6.How does Aetrix verify that AZ1085CS2-3.3TRE1 is sourced from the original manufacturer or authorized distributors?
All AZ1085CS2-3.3TRE1 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 AZ1085CS2-3.3TRE1 meets industry standards.
7.What is the process for return or replacement of AZ1085CS2-3.3TRE1?
All AZ1085CS2-3.3TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085CS2-3.3TRE1, 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 AZ1085CS2-3.3TRE1 part is unused and in its original packaging.
Return procedure for AZ1085CS2-3.3TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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