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Diodes Incorporated AZ1085CS-1.8TRE1
- Part No.:
- AZ1085CS-1.8TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
AZ1085CS-1.8TRE1.pdf
- Description:
- IC REG LINEAR 1.8V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,006
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Product details
Overview
AZ1085CS-1.8TRE1 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 power to microprocessor cores, FPGA I/O banks, and telecom baseband ICs requiring precise low-voltage rails.
For engineers reviewing the AZ1085CS-1.8TRE1 datasheet, AZ1085CS-1.8TRE1 pinout, AZ1085CS-1.8TRE1 application, or AZ1085CS-1.8TRE1 equivalent, key selection criteria include dropout voltage at 3A, load regulation under 7mV, compatibility with ceramic output capacitors, and thermal resistance (θJA = 75°C/W) in high-density PCB layouts.
Technical Context
The AZ1085CS-1.8TRE1 integrates a bandgap reference, error amplifier, and current-limiting circuit to maintain regulated 1.8V output across 10mA–3A load range. 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 achieves 0.1% typical load regulation and 0.015% line regulation-critical for noise-sensitive analog and digital subsystems. The device operates from 3.3V to 7V input and supports low-ESR ceramic capacitors down to 10µF on both input and output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% (1.764V–1.836V), enabling direct supply to 1.8V logic families without external resistors. |
| Max Output Current | 3A continuous, supporting high-current SoC and ASIC power domains without external pass transistors. |
| Dropout Voltage | 1.3V typical at 3A, allowing operation with only 3.1V input-ideal for battery-powered systems with tight headroom. |
| Load Regulation | ≤7mV over 0–3A load step, minimizing voltage sag during CPU burst activity or FPGA configuration. |
| Line Regulation | 0.5mV typical over 3.3–7V input range, ensuring stability when upstream DC/DC output varies. |
| Thermal Resistance | θJA = 75°C/W (TO263), requiring ≥2.5cm² copper pour for full 3A operation at +70°C ambient. |
| PSRR | 72dB at 120Hz, suppressing ripple from buck converter secondaries before sensitive analog circuits. |
Pinout & Package
Package: TO263 (D2PAK), surface-mount, thermally enhanced with exposed tab connected to output (pin 2). RoHS-compliant, lead-free, green molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Input voltage supply connection | Accepts 3.3–7V DC; requires ≥10µF low-ESR ceramic capacitor placed within 5mm for stability. |
| 2 (OUTPUT) | Regulated 1.8V output and thermal pad | Delivers up to 3A; tab must be soldered to ≥2.5cm² internal/external copper for thermal performance. |
| 3 (ADJ/GND) | Reference ground and feedback node | Connect directly to system ground plane; no external components required for fixed-output version. |
Key Features
| Feature | Design Value |
|---|---|
| Low ESR capacitor support | Stable with 10µF ceramic output cap-reduces board area vs. electrolytic solutions and improves transient response. |
| Integrated current limit | 4.5A foldback protection prevents damage during short-circuit events without external sensing circuitry. |
| Thermal shutdown | Activates at +150°C junction temperature and auto-recovers upon cooling-enables robust field operation. |
| RMS output noise | 0.003% of VOUT (≈54µV RMS), suitable for powering ADC references and RF synthesizer VCO supplies. |
| Lead-free & green compliance | Fully RoHS 3 compliant, halogen- and antimony-free (<900ppm Br+Cl, <1000ppm Sb), meeting strict environmental mandates. |
Applications
| Microprocessor Core Supply | Telecom Baseband Power |
|---|---|
Use Scenario: Powers ARM Cortex-A series CPU cores in industrial gateways operating at 1.8V I/O voltage. IC Role / Device Role / Timing Role: Primary low-noise post-regulator delivering clean 1.8V rail downstream of a 5V buck converter. Use Value: 72dB PSRR suppresses 120Hz ripple from upstream converter; 7mV load regulation prevents core voltage droop during cache flush bursts. |
Use Scenario: Supplies 1.8V bias to LTE/5G baseband processors in small-cell radio units. IC Role / Device Role / Timing Role: Point-of-load regulator for digital signal processor (DSP) I/O banks requiring tight voltage tolerance. Use Value: Fixed 1.8V output eliminates resistor divider errors; TO263 thermal pad enables conduction cooling in sealed enclosures. |
| FPGA I/O Bank Regulator | DVD/Blu-ray Player Logic Rail |
Use Scenario: Provides 1.8V to Xilinx Artix-7 FPGA I/O banks in broadcast video processing hardware. IC Role / Device Role / Timing Role: Dedicated LDO for configurable I/O standards (LVCMOS18, SSTL18) with fast transient recovery. Use Value: 100µs load transient response time maintains signal integrity during high-speed DDR interface toggling. |
Use Scenario: Generates 1.8V for DVD-ROM controller ASIC and servo motor driver logic in consumer optical drives. IC Role / Device Role / Timing Role: Main logic supply decoupled from noisy motor drive circuitry via low-dropout architecture. Use Value: 1.3V dropout allows use of 3.3V intermediate rail, reducing heat generation versus higher-dropout alternatives. |
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 |
|---|---|---|---|
| AP2112K-1.8TRG1 | 2A max output, 0.45V dropout at 2A, SOT-25 package, no thermal shutdown | Limited to lower-current peripherals; unsuitable for 3A microprocessor loads | Select only for space-constrained, sub-2A applications where thermal margin is assured. |
| MIC29302WU-1.8 | 3A output, 0.6V dropout at 3A, TO263 package, integrated reverse-battery protection | Superior efficiency in low-headroom systems; adds reverse-polarity fault tolerance | Prefer when input may experience polarity reversal or when <0.6V dropout is mandatory. |
Compared with AP2112K-1.8TRG1 and MIC29302WU-1.8, the AZ1085CS-1.8TRE1 offers higher current capability than the former and more robust thermal protection than the latter-making it optimal for thermally demanding, high-reliability embedded systems where 1.8V/3A stability is non-negotiable.
Availability
AZ1085CS-1.8TRE1 is available at Aetrix Electronics and suitable for microprocessor core supplies, telecom baseband power, and FPGA I/O bank regulation requiring stable component supply across extended production lifecycles.
Supply support for AZ1085CS-1.8TRE1 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 manufacturer specializing in discrete, analog, and mixed-signal devices 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 telecom equipment-emphasizing thermal robustness, ceramic capacitor compatibility, and fixed-output simplicity.
FAQ
What is the minimum input voltage required for stable 1.8V output at 3A?
The AZ1085CS-1.8TRE1 requires a minimum input voltage of 3.1V to maintain regulation at 3A load, based on its 1.3V typical dropout voltage. At worst-case 1.5V dropout (per datasheet limits), 3.3V input ensures operation across temperature and process variation. Input below 3.3V risks dropout and unregulated output.
Can this regulator be used with tantalum or aluminum electrolytic output capacitors?
No-AZ1085CS-1.8TRE1 is optimized for low-ESR ceramic capacitors (≥10µF, X5R/X7R). Tantalum and aluminum electrolytics exhibit higher ESR and impedance phase shifts that can cause instability or oscillation. The datasheet explicitly specifies ceramic-only stability and does not guarantee performance with other dielectrics.
Is the exposed thermal pad electrically isolated or connected internally?
The exposed tab (pin 2) is internally connected to the OUTPUT terminal-not isolated. It must be soldered to a grounded or output-connected copper pour for thermal conduction. Connecting it to system ground while output is at 1.8V creates a short; proper layout ties the pad directly to the 1.8V output net and thermal plane.
Does this part support parallel operation for higher current?
No-AZ1085CS-1.8TRE1 lacks built-in current-sharing circuitry or master/slave control pins. Parallel connection without external ballast resistors or active current balancing will result in unequal load distribution and potential thermal runaway. For >3A, select a higher-current LDO or switcher solution.
AZ1085CS-1.8TRE1 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-1.8TRE1 FAQ
1.How can I place an order for AZ1085CS-1.8TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085CS-1.8TRE1 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-1.8TRE1 reliable?
The price and inventory of AZ1085CS-1.8TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1085CS-1.8TRE1 is usually 5 days.
3.What payment methods are accepted for AZ1085CS-1.8TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085CS-1.8TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085CS-1.8TRE1?
AZ1085CS-1.8TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085CS-1.8TRE1 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-1.8TRE1?
For technical support, including AZ1085CS-1.8TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085CS-1.8TRE1 requirements.
6.How does Aetrix verify that AZ1085CS-1.8TRE1 is sourced from the original manufacturer or authorized distributors?
All AZ1085CS-1.8TRE1 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-1.8TRE1 meets industry standards.
7.What is the process for return or replacement of AZ1085CS-1.8TRE1?
All AZ1085CS-1.8TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085CS-1.8TRE1, 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-1.8TRE1 part is unused and in its original packaging.
Return procedure for AZ1085CS-1.8TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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