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Diodes Incorporated AZ1085CS-3.3TRE1
- Part No.:
- AZ1085CS-3.3TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
AZ1085CS-3.3TRE1.pdf
- Description:
- IC REG LINEAR 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,159
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Product details
Overview
AZ1085CS-3.3TRE1 from Diodes Incorporated is a 3A low-dropout linear regulator with fixed 3.3V output, TO263 package, 1.3V typical dropout at full load, thermal shutdown, and current limiting. It delivers stable power to microprocessor cores, motherboard VRMs, and telecom baseband circuits requiring precise voltage regulation under high-current, low-input-margin conditions.
For engineers reviewing the AZ1085CS-3.3TRE1 datasheet, AZ1085CS-3.3TRE1 pinout, AZ1085CS-3.3TRE1 application, or AZ1085CS-3.3TRE1 equivalent, this page provides verified electrical specifications, thermal resistance (θJA = 75°C/W), load regulation (7 mV max), line regulation (0.5 mV typ), and package-specific PCB layout guidance for TO263.
Technical Context
The AZ1085CS-3.3TRE1 integrates a bandgap reference, precision error amplifier, and current-limiting circuitry to maintain ±1% output accuracy across 0–3A load and 0–+125°C junction temperature. Its internal thermal shutdown activates at +150°C junction temperature, protecting against sustained overload or poor heatsinking.
Designed for post-regulation after switching converters, it accepts input voltages up to 12V and sustains regulation down to VIN – VOUT = 1.3V at 3A. The device is optimized for use with low-ESR ceramic capacitors (10µF input, 22µF output) and exhibits 72dB PSRR at 120Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over 10mA–3A load and 0–+125°C junction temperature |
| Dropout Voltage | 1.3V typical at 3A load - enables operation with only 4.6V input for 3.3V output |
| Output Current | 3A continuous - supports high-current digital loads like SoC cores and FPGA I/O banks |
| Current Limit | 4.5A minimum - provides robust short-circuit protection without latch-off |
| Line Regulation | 0.5 mV typical - ensures <0.015% output change across 4.8–10V input range |
| Load Regulation | 7 mV maximum - maintains tight voltage stability from no-load to full 3A |
| Thermal Resistance θJA | 75°C/W for TO263 - defines maximum power dissipation (≤1.6W at TA = +70°C) |
Pinout & Package
Package: TO263 (D²PAK), surface-mount, thermally enhanced with exposed tab (pin 3) tied to GND. Requires minimum 16.76mm × 8.56mm copper pour for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INPUT | Unregulated input supply (4.8–12V); connects to bulk capacitor and upstream converter |
| 2 | OUTPUT | Regulated 3.3V output; requires 22µF low-ESR ceramic capacitor placed adjacent to pin |
| 3 | GND / Tab | Power ground and thermal path; must be soldered to ≥1000 mm² internal/external copper plane |
Key Features
| Feature | Design Value |
|---|---|
| Low ESR capacitor compatibility | Stable with 10µF input / 22µF output ceramic caps - eliminates need for tantalum or electrolytic |
| Thermal shutdown | Activates at +150°C junction temperature and auto-recovers upon cooling - prevents permanent die damage |
| Lead-free & Green packaging | TO263 meets RoHS 3 (2015/863/EU) and halogen/antimony-free requirements (<900ppm Br+Cl, <1000ppm Sb) |
| High PSRR | 72dB at 120Hz - effectively suppresses ripple from upstream DC-DC converters |
| Adjustable version available | AZ1085C-ADJ variant uses external resistors (R1/R2) to set output from 1.225V to 12V - same pinout and thermal design |
Applications
| Microprocessor Core Supply | Motherboard VRM Post-Regulation |
|---|---|
|
Use Scenario: Powering ARM Cortex-A series CPU cores on embedded compute modules where input rail is 5V from buck converter. IC Role / Device Role / Timing Role: Final-stage LDO delivering clean, low-noise 3.3V to processor I/O and auxiliary logic. Use Value: 7 mV load regulation ensures voltage stays within ±0.2% across dynamic current steps up to 3A, preventing timing violations. |
Use Scenario: Tight-tolerance 3.3V rail for DDR memory termination and chipset I/O on industrial motherboards. IC Role / Device Role / Timing Role: Low-noise post-regulator stabilizing switched 5V rail before distribution to sensitive analog and clock domains. Use Value: 72dB PSRR at 120Hz reduces switching noise coupling into memory interface, lowering bit error rate. |
| Telecom Baseband Power | DVD Player System Rail |
|
Use Scenario: Providing regulated 3.3V to DSP and ADC sections in LTE small-cell baseband units operating in sealed enclosures. IC Role / Device Role / Timing Role: Thermally robust LDO maintaining regulation under ambient temperatures up to +70°C with minimal heatsink area. Use Value: θJA = 75°C/W and +125°C max TJ allow full 3A operation with ≤1.6W dissipation - avoids thermal derating. |
Use Scenario: Powering servo control ICs and optical pickup drivers in consumer DVD players where space and cost are constrained. IC Role / Device Role / Timing Role: Cost-optimized, high-current LDO replacing discrete solutions in legacy designs requiring 3.3V at up to 2.5A. Use Value: Fixed 3.3V output eliminates external resistor network, reducing BOM count and layout area vs. adjustable regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APL3333BI-TRG1 | Lower quiescent current (3mA vs. 5–10mA), same 3A rating and TO263 package | Better suited for battery-backed systems needing ultra-low standby power | Select when system idle current dominates total energy budget; verify thermal margin at full load |
| TLV1117-33CDR | 1A output limit, SO-8 package, higher dropout (1.2V @ 800mA), lower cost | Appropriate for low-power peripherals but insufficient for 3A core rails | Use only for auxiliary 3.3V rails ≤1A; not a drop-in replacement for main processor supply |
Compared with APL3333BI-TRG1, AZ1085CS-3.3TRE1 offers higher PSRR (72dB vs. 65dB) and tighter load regulation (7 mV vs. 15 mV), making it preferable for noise-sensitive digital loads. Versus TLV1117-33CDR, it delivers triple the current in the same footprint class but requires larger thermal copper area.
Availability
AZ1085CS-3.3TRE1 is available at Aetrix Electronics and suitable for microprocessor core supplies, motherboard VRM post-regulation, telecom baseband power, and DVD player system rails requiring stable component supply with known thermal behavior and RoHS-compliant packaging.
Supply support for AZ1085CS-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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection devices for industrial, computing, and consumer markets.
The AZ1085C series was designed for high-current, low-noise linear regulation in space-constrained applications where switching noise must be eliminated - targeting embedded computing, telecom infrastructure, and consumer AV equipment.
FAQ
What is the maximum input voltage for AZ1085CS-3.3TRE1?
The absolute maximum input voltage is 13.2V, but the recommended operating maximum is 12V per the datasheet's Recommended Operating Conditions table. Exceeding 12V risks accelerated degradation under thermal stress, especially at high ambient temperatures or reduced airflow. Operation above 12V is not guaranteed for reliability or lifetime.
Can AZ1085CS-3.3TRE1 be used with aluminum polymer capacitors instead of ceramic?
Yes - the device is stable with aluminum polymer capacitors (ESR 10–50 mΩ), but ceramic capacitors are preferred due to lower ESR (<5 mΩ), smaller footprint, and superior high-frequency noise suppression. If using polymer, ensure minimum 22µF output capacitance and verify transient response with load steps up to 3A.
Is thermal pad connection mandatory for AZ1085CS-3.3TRE1 in TO263?
Yes - the exposed tab (pin 3) is electrically GND and serves as the primary thermal path. It must be soldered to a ≥1000 mm² copper area (internal or external layer) with ≥4 thermal vias (0.3mm diameter) to inner ground planes. Omitting this connection limits safe continuous current to <1.2A at +70°C ambient.
Does AZ1085CS-3.3TRE1 support reverse-voltage protection?
No - the device lacks integrated reverse-voltage protection. Applying reverse polarity to the INPUT pin can cause irreversible damage. External protection (e.g., series Schottky diode or ideal diode controller) is required in systems where input reversal is possible, such as hot-swap or dual-supply configurations.
AZ1085CS-3.3TRE1 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-3.3TRE1 FAQ
1.How can I place an order for AZ1085CS-3.3TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085CS-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 AZ1085CS-3.3TRE1 reliable?
The price and inventory of AZ1085CS-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 AZ1085CS-3.3TRE1 is usually 5 days.
3.What payment methods are accepted for AZ1085CS-3.3TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085CS-3.3TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085CS-3.3TRE1?
AZ1085CS-3.3TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085CS-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 AZ1085CS-3.3TRE1?
For technical support, including AZ1085CS-3.3TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085CS-3.3TRE1 requirements.
6.How does Aetrix verify that AZ1085CS-3.3TRE1 is sourced from the original manufacturer or authorized distributors?
All AZ1085CS-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 AZ1085CS-3.3TRE1 meets industry standards.
7.What is the process for return or replacement of AZ1085CS-3.3TRE1?
All AZ1085CS-3.3TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085CS-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 AZ1085CS-3.3TRE1 part is unused and in its original packaging.
Return procedure for AZ1085CS-3.3TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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