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Diodes Incorporated AZ1085CS-ADJTRE1
- Part No.:
- AZ1085CS-ADJTRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
AZ1085CS-ADJTRE1.pdf
- Description:
- IC REG LINEAR POS ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,186
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Product details
Overview
AZ1085CS-ADJTRE1 from Diodes Incorporated is an adjustable 3A low-dropout linear regulator with 1.225V internal reference, 1.3V typical dropout at full load, thermal shutdown, and current limiting. It delivers stable output voltage in microprocessor supplies, post-regulation for switching converters, and telecom power rails where precision and high current are required.
For engineers reviewing the AZ1085CS-ADJTRE1 datasheet, AZ1085CS-ADJTRE1 pinout, AZ1085CS-ADJTRE1 application, or AZ1085CS-ADJTRE1 equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for continuity planning in industrial and embedded power designs.
Technical Context
The AZ1085CS-ADJTRE1 implements a bandgap-referenced error amplifier driving a PNP pass transistor, enabling precise output regulation via external resistive feedback. Its architecture supports operation with low-ESR ceramic capacitors and maintains stability across 0–125°C junction temperature.
It integrates overcurrent protection (4.5A limit) and thermal shutdown triggered at +150°C junction temperature. Dropout voltage remains ≤1.5V up to 3A load, and line/load regulation are specified at 0.015% and 0.1% respectively under defined test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - supports high-current analog/digital loads without external parallel devices. |
| Dropout Voltage | 1.3V typical at 3A - enables regulation from input as low as VOUT + 1.3V, critical for battery-powered systems. |
| Reference Voltage | 1.225V (min) to 1.275V (max) - sets output accuracy baseline for external resistor divider design. |
| Current Limit | 4.5A - protects against short-circuit faults while allowing brief inrush during startup. |
| Thermal Shutdown | Activates at TJ ≥ +150°C - prevents permanent damage during sustained overload or poor heatsinking. |
| PSRR | 72dB at 120Hz - suppresses ripple from upstream switching supplies in hybrid power architectures. |
| Operating Junction Temp | 0°C to +125°C - qualified for industrial ambient environments without derating below 3A. |
Pinout & Package
Package: TO263 (D²PAK), surface-mount, thermally enhanced with exposed tab connected to output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Input voltage supply | Accepts unregulated DC input up to 13.2V; requires local 10µF ceramic capacitor for stability. |
| 2 (OUTPUT) | Regulated output | Delivers adjustable output; connects to exposed tab for thermal conduction and current return path. |
| 3 (ADJ/GND) | Feedback reference node | Sets output voltage via external R1/R2 divider; must be bypassed with 22µF capacitor for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Low ESR capacitor compatibility | Stable with ≥10µF ceramic output caps - eliminates need for bulk electrolytic, reducing board space and aging risk. |
| Adjustable output range | VOUT = 1.225V × (1 + R2/R1) + IADJ × R2 - supports custom voltages from ~1.25V to |
| Lead-free & green packaging | TO263 package fully RoHS 3 compliant and halogen/antimony free - meets IPC-J-STD-020 moisture sensitivity level 3. |
| Thermal resistance (θJC) | 6.34°C/W - enables >10W power dissipation with moderate heatsinking, suitable for compact industrial modules. |
Applications
| Microprocessor Core Supply | Battery Charger Post-Regulator |
|---|---|
|
Use Scenario: Providing clean, low-noise 1.2V–1.8V supply to ARM Cortex-A series SoCs in portable edge AI devices. IC Role / Device Role / Timing Role: Primary LDO delivering core voltage with <0.1% load regulation to maintain CPU frequency stability under dynamic current steps. Use Value: Enables direct regulation from 3.3V intermediate rail without additional buck stages, reducing BOM count and EMI. |
Use Scenario: Final-stage regulation of Li-ion battery charging voltage (e.g., 4.2V) in USB-C PD power banks. IC Role / Device Role / Timing Role: Precision post-regulator ensuring ±0.5% output accuracy during CC/CV charge termination phase. Use Value: Eliminates need for trimming resistors or digital DAC control, simplifying charger IC interface and layout. |
| Telecom Line Card Power | DVD Player Audio/Video Rail |
|
Use Scenario: Generating isolated 3.3V/5.0V rails for FPGA configuration, SerDes, and PHY interfaces on carrier-grade line cards. IC Role / Device Role / Timing Role: High-current auxiliary LDO supplying noise-sensitive transceivers with 72dB PSRR at 120Hz switching frequency. Use Value: Maintains signal integrity in 10Gbps serial links by rejecting ripple from upstream DC/DC converters. |
Use Scenario: Powering analog audio DACs and video decoder ICs in consumer DVD players requiring ultra-low RMS noise. IC Role / Device Role / Timing Role: Low-noise (0.003% of VOUT) linear regulator feeding sensitive analog front-ends. Use Value: Prevents audible hiss and video chroma noise without requiring additional LC filtering stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| APL5315-ADJ | 2.5A max output, 0.9V dropout at 2.5A, no integrated thermal shutdown | Limited to lower-current applications; requires external thermal monitoring circuitry | Select when footprint compatibility with TO263 is needed but full 3A capability is not required. |
| LT1963AEST-ADJ | 1.5A output, 340mV dropout at 1.5A, 70dB PSRR, higher quiescent current (1mA vs. 5–10mA) | Better ripple rejection at high frequencies but insufficient current for microprocessor cores | Prefer for noise-critical analog subsystems where 1.5A suffices and ultra-low dropout is prioritized. |
Compared with APL5315-ADJ and LT1963AEST-ADJ, the AZ1085CS-ADJTRE1 uniquely balances 3A delivery, 1.3V dropout, integrated protection, and TO263 thermal performance-making it irreplaceable in high-power linear regulation where both current and reliability are non-negotiable.
Availability
AZ1085CS-ADJTRE1 is available at Aetrix Electronics and suitable for microprocessor core supplies, telecom line card power, and battery charger post-regulation requiring stable component supply despite its obsolete status and controlled lifecycle management.
Supply support for AZ1085CS-ADJTRE1 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 consumer markets.
The AZ1085C series belongs to Diodes' high-current LDO portfolio, designed specifically for applications demanding robust thermal performance, wide input range, and compatibility with modern ceramic capacitors in space-constrained layouts.
FAQ
Is AZ1085CS-ADJTRE1 still in active production?
No - Diodes Incorporated has discontinued the AZ1085C series. AZ1085CS-ADJTRE1 is obsolete per DS36735 Rev. 4 (November 2021). Aetrix Electronics maintains limited legacy stock with full traceability and offers engineering support for migration paths to the pin-compatible AZ1084C series.
What is the minimum load current requirement for stable operation?
The AZ1085CS-ADJTRE1 requires a minimum load current of 3mA at TA = +25°C and up to 10mA at TJ = +125°C, as specified in the Electrical Characteristics table. This ensures proper biasing of internal circuitry and avoids regulation drift in light-load conditions.
Can AZ1085CS-ADJTRE1 be used with tantalum output capacitors?
Yes, but ceramic capacitors are strongly preferred. The device is optimized for low-ESR ceramics (≥10µF); tantalum capacitors may cause instability due to higher ESR and aging effects. If used, verify phase margin with network analyzer testing per application note DN005.
How does the ADJ pin current affect output voltage accuracy?
IADJ is 55–120µA (typical 78µA) and flows through R2 in the feedback divider. For a 1.25V reference targeting 3.3V output (R2 = 3.3kΩ), this adds ~260mV error - compensated by selecting R2 ≤ 1kΩ or using tighter tolerance resistors to hold total error within ±1%.
AZ1085CS-ADJTRE1 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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 10.5V
- 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-ADJTRE1 FAQ
1.How can I place an order for AZ1085CS-ADJTRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085CS-ADJTRE1 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-ADJTRE1 reliable?
The price and inventory of AZ1085CS-ADJTRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1085CS-ADJTRE1 is usually 5 days.
3.What payment methods are accepted for AZ1085CS-ADJTRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085CS-ADJTRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085CS-ADJTRE1?
AZ1085CS-ADJTRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085CS-ADJTRE1 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-ADJTRE1?
For technical support, including AZ1085CS-ADJTRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085CS-ADJTRE1 requirements.
6.How does Aetrix verify that AZ1085CS-ADJTRE1 is sourced from the original manufacturer or authorized distributors?
All AZ1085CS-ADJTRE1 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-ADJTRE1 meets industry standards.
7.What is the process for return or replacement of AZ1085CS-ADJTRE1?
All AZ1085CS-ADJTRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085CS-ADJTRE1, 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-ADJTRE1 part is unused and in its original packaging.
Return procedure for AZ1085CS-ADJTRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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