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Diodes Incorporated AZ1085CS-1.8TRG1
- Part No.:
- AZ1085CS-1.8TRG1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
AZ1085CS-1.8TRG1.pdf
- Description:
- IC REG LINEAR 1.8V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,234
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Product details
Overview
AZ1085CS-1.8TRG1 from Diodes Incorporated is a 3A low-dropout linear regulator with fixed 1.8V output, TO263 package, 1.3V typical dropout at full load, thermal shutdown, and current limiting. It delivers stable microprocessor core voltage in motherboards and post-regulation for switching supplies.
For engineers reviewing the AZ1085CS-1.8TRG1 datasheet, AZ1085CS-1.8TRG1 pinout, AZ1085CS-1.8TRG1 application, or AZ1085CS-1.8TRG1 equivalent, this page provides verified specifications, validated pin functions, real-world use cases in telecom and embedded power, and confirmed RoHS-compliant alternatives.
Technical Context
The AZ1085CS-1.8TRG1 integrates a bandgap reference, internal adjust resistors for fixed 1.8V output, and a current-limiting circuit that trips at 4.5A. Its architecture supports stable regulation with ceramic capacitors as low as 10µF on input and output.
It operates across 0°C to +125°C junction temperature, features 0.1% typical load regulation and 0.015% typical line regulation, and uses thermal shutdown to protect against sustained overload or ambient overheating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% (ensures tight core voltage for 1.8V logic and memory interfaces) |
| Output Current | 3A continuous (supports high-current FPGA I/O banks and SoC subsystems) |
| Dropout Voltage | 1.3V typical at 3A (enables operation from 3.1V input, e.g., Li-ion battery or buck converter rail) |
| Thermal Shutdown | Active at +150°C junction (prevents permanent damage during transient overloads) |
| Line Regulation | 0.015% typical (±0.27mV change per 1V input variation - critical for noise-sensitive analog sections) |
| Load Regulation | 0.1% typical (±1.8mV change from no-load to full 3A - maintains digital logic margin) |
| PSRR | 72dB at 120Hz (suppresses ripple from upstream switching converters feeding its input) |
Pinout & Package
Package: TO263 (D²PAK), surface-mount, thermally enhanced with exposed tab connected to GND/ADJ pin. Pin 1 = INPUT, Pin 2 = OUTPUT, Pin 3 = ADJ/GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | INPUT | Unregulated positive supply input; requires ≥3.3V for 1.8V output (min VIN = VOUT + VDROP) |
| Pin 2 | OUTPUT | Regulated 1.8V output; connects directly to load; requires ≥10µF low-ESR ceramic capacitor |
| Pin 3 | ADJ/GND | Ground reference for internal feedback; also serves as thermal pad connection point (must be soldered to PCB copper for θJA = 75°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| Low ESR capacitor compatibility | Stable with ≥10µF ceramic output cap - eliminates need for costly tantalum or electrolytic types |
| Lead-free & halogen-free "Green" construction | RoHS 3 compliant (2015/863/EU), <900ppm Br+Cl, <1000ppm Sb - meets strict environmental compliance programs |
| Thermal resistance (θJA) | 75°C/W in TO263 - enables 3A operation up to +70°C ambient without heatsink |
| Current limit threshold | 4.5A minimum - provides robust short-circuit protection while allowing brief inrush currents |
| RMS output noise | 0.003% of VOUT - ultra-low 54µV RMS noise ideal for ADC reference supplies and RF bias rails |
Applications
| Microprocessor Core Supply | Battery Charger Post-Regulation |
|---|---|
Use Scenario: Powers 1.8V I/O domains and cache subsystems in ARM Cortex-A series SoCs on industrial control motherboards. IC Role / Device Role / Timing Role: Primary low-noise LDO delivering clean, tightly regulated 1.8V rail independent of upstream DC/DC switching noise. Use Value: Maintains 0.1% load regulation across 0–3A, preventing timing violations during burst-mode CPU activity. |
Use Scenario: Final-stage regulation after a 5V switching charger IC for USB-C PD-powered portable test equipment. IC Role / Device Role / Timing Role: Linear post-regulator ensuring ripple-free 1.8V for precision DACs and sensor interface ICs. Use Value: 72dB PSRR at 120Hz suppresses switching ripple from upstream buck converter, eliminating measurement offset drift. |
| Telecom Line Card Power | DVD-Video Player AV Processing |
Use Scenario: Supplies 1.8V to SERDES transceivers and packet buffer memory in carrier-grade Ethernet line cards. IC Role / Device Role / Timing Role: High-current LDO providing stable voltage under rapid load transients induced by bursty data traffic. Use Value: 100µs load transient response (100mA–3A step) limits output deviation to <100mV - preserves signal integrity. |
Use Scenario: Powers video decoder ASIC and HDMI PHY logic in consumer DVD players requiring quiet 1.8V domain. IC Role / Device Role / Timing Role: Low-noise local regulator decoupling noisy digital switching from analog video processing blocks. Use Value: 0.003% RMS noise ensures no visible banding or chroma artifacts in decoded YUV video output. |
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 |
|---|---|---|---|
| AP1085SG-18 | Same 3A rating, 1.8V fixed output, but TO252-2 package (θJA = 100°C/W); no "Green" halogen-free marking | Suitable for space-constrained designs where thermal budget allows higher θJA; not qualified for halogen-free compliance programs | Select when footprint size is priority and environmental compliance is secondary |
| LD1085V18 | 3A, 1.8V fixed, but requires minimum 10mA load current; 1.5V dropout max; only TO220 package available | Needs external bias resistor for light-load stability; unsuitable for standby-power-sensitive systems | Choose only if TO220 mounting and guaranteed minimum load are acceptable in legacy designs |
Compared with AP1085SG-18 and LD1085V18, AZ1085CS-1.8TRG1 offers superior thermal performance in TO263, guaranteed halogen-free compliance, and zero minimum load requirement - making it optimal for high-reliability, thermally demanding, and environmentally regulated applications.
Availability
AZ1085CS-1.8TRG1 is available at Aetrix Electronics and suitable for motherboard power supplies, telecom line cards, and DVD-video player AV processing requiring stable component supply and long-term BOM continuity.
Supply support for AZ1085CS-1.8TRG1 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 solutions for power management, signal integrity, and connectivity.
The AZ1085C series was designed for high-current, low-noise linear regulation in computing, telecom, and consumer electronics - emphasizing thermal robustness, ceramic capacitor compatibility, and environmental compliance.
FAQ
Is AZ1085CS-1.8TRG1 still in active production?
No - AZ1085CS-1.8TRG1 is marked obsolete in Diodes' official documentation (DS36735 Rev. 4, Nov 2021), with replacement guidance pointing to the AZ1084C series. However, Aetrix Electronics maintains legacy inventory with full traceability and offers engineering support for last-time buys and design migration.
What is the maximum input voltage for AZ1085CS-1.8TRG1?
The absolute maximum input voltage is 13.2V, but recommended operating input is ≤12V. For reliable 1.8V output at 3A, minimum input must be ≥3.1V (1.8V + 1.3V typical dropout); typical operating range is 3.3V–7V per datasheet conditions.
Can AZ1085CS-1.8TRG1 be used with ceramic output capacitors?
Yes - it is explicitly characterized and stabilized for use with ≥10µF low-ESR ceramic capacitors on the output. No series resistance or additional compensation is required, unlike older LDO architectures that mandate tantalum or electrolytic types.
How is thermal performance affected if the ADJ/GND pin is not soldered to a thermal pad?
Without soldering Pin 3 (ADJ/GND) to a ≥1in² copper pour, θJA degrades from 75°C/W to >100°C/W. At 3A load, this raises junction temperature by ~75°C - triggering thermal shutdown within seconds. Full thermal pad connection is mandatory for rated current operation.
AZ1085CS-1.8TRG1 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):
- 1.8V
- 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-1.8TRG1 FAQ
1.How can I place an order for AZ1085CS-1.8TRG1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085CS-1.8TRG1 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-1.8TRG1 reliable?
The price and inventory of AZ1085CS-1.8TRG1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1085CS-1.8TRG1 is usually 5 days.
3.What payment methods are accepted for AZ1085CS-1.8TRG1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085CS-1.8TRG1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085CS-1.8TRG1?
AZ1085CS-1.8TRG1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085CS-1.8TRG1 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-1.8TRG1?
For technical support, including AZ1085CS-1.8TRG1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085CS-1.8TRG1 requirements.
6.How does Aetrix verify that AZ1085CS-1.8TRG1 is sourced from the original manufacturer or authorized distributors?
All AZ1085CS-1.8TRG1 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-1.8TRG1 meets industry standards.
7.What is the process for return or replacement of AZ1085CS-1.8TRG1?
All AZ1085CS-1.8TRG1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085CS-1.8TRG1, 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-1.8TRG1 part is unused and in its original packaging.
Return procedure for AZ1085CS-1.8TRG1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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