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Diodes Incorporated AZ1085S-1.5TRE1
- Part No.:
- AZ1085S-1.5TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
AZ1085S-1.5TRE1.pdf
- Description:
- IC REG LINEAR 1.5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,576
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Product details
Overview
AZ1085S-1.5TRE1 from BCD Semiconductor Manufacturing Limited is a fixed-output 1.5V, 3A low dropout linear regulator in TO-263-3 package with 1.3V typical dropout at full load, on-chip thermal shutdown, and ±1.5% output voltage accuracy over 0–125°C junction temperature. It delivers stable post-regulation for microprocessor core supplies and telecom power rails where input-to-output differential is constrained.
For engineers reviewing the AZ1085S-1.5TRE1 datasheet, AZ1085S-1.5TRE1 pinout, AZ1085S-1.5TRE1 application, or AZ1085S-1.5TRE1 equivalent, key selection criteria include dropout voltage at 3A, thermal resistance (θJC = 4.15°C/W), load regulation (≤15 mV), and compatibility with standard PCB thermal pads for TO-263-3 mounting.
Technical Context
The AZ1085S-1.5TRE1 implements a bandgap-referenced error amplifier driving a PNP pass transistor, enabling low dropout operation without external compensation. Its internal current limiting (4.5A) and thermal protection operate independently of external components.
As a fixed-output variant, it integrates precision feedback resistors-eliminating external dividers-and maintains regulation across 3.0–6.0V input range while delivering 1.5V ±1.5% under 10mA–3A load and 0–125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.5V ±1.5% (guaranteed over 10mA–3A load and 0–125°C TJ) |
| Dropout Voltage | 1.3V typical at 3A (enables operation with VIN as low as 2.8V for VOUT=1.5V) |
| Load Regulation | ≤15 mV (ΔVOUT from 0 to 3A load ensures stable core supply under dynamic CPU load) |
| Line Regulation | ≤1 mV (ΔVOUT over 3.0–10V input supports variable upstream switching supply ripple) |
| Thermal Resistance θJC | 4.15°C/W (TO-263-3 package enables >7W dissipation before thermal shutdown at 25°C case) |
| Current Limit | 4.5A (protects against short-circuit faults without external foldback circuitry) |
| Quiescent Current | 5–10 mA (low no-load consumption preserves efficiency in always-on subsystems) |
Pinout & Package
Package: TO-263-3 (D²PAK), surface-mount, thermally enhanced with exposed tab connected to OUTPUT pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Unregulated input supply connection | Accepts 3.0–6.0V DC; requires ≥10µF ceramic input capacitor for stability |
| 2 (OUTPUT) | Regulated 1.5V output and thermal pad connection | Tab is electrically tied to OUTPUT; must be soldered to large copper pour for thermal management |
| 3 (ADJ/GND) | Feedback reference node (GND for fixed version) | Internally connected to ground; no external connection required-pin must be terminated to GND plane |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout at full load | 1.3V typical at 3A enables use with 3.3V intermediate bus for 1.5V core rails |
| Integrated thermal shutdown | Activates at ~150°C junction temperature; auto-recovers after cooldown-no latch required |
| Fixed 1.5V output | No external resistors needed; eliminates layout sensitivity and resistor tolerance drift |
| Robust line/load regulation | ≤1 mV line and ≤15 mV load variation ensures <±1% total output deviation in embedded systems |
| Pb-free & green compliant | "E1" suffix denotes RoHS-compliant lead finish; "G1" indicates halogen-free molding compound |
Applications
| Microprocessor Core Supply | Telecom Line Card Power |
|---|---|
|
Use Scenario: Providing clean 1.5V bias to ARM Cortex-A series SoC cores with burst current up to 3A. IC Role / Device Role / Timing Role: Primary post-regulator downstream of a 3.3V buck converter, maintaining tight voltage tolerance during DVFS transitions. Use Value: 1.3V dropout allows margin retention when input bus sags; 15 mV load regulation prevents logic errors during CPU load spikes. |
Use Scenario: Generating stable 1.5V for FPGA configuration I/O banks in carrier-grade line cards. IC Role / Device Role / Timing Role: Low-noise local regulator for sensitive interface circuitry requiring sub-1% voltage stability over temperature. Use Value: 0.003% RMS output noise and 72 dB PSRR at 120Hz suppress switching noise from upstream DC/DC converters. |
| Battery Charger Reference | Motherboard VRM Auxiliary Rail |
|
Use Scenario: Supplying precision reference voltage to Li-ion battery charge controller ICs in portable base stations. IC Role / Device Role / Timing Role: Fixed-voltage source for ADC references and op-amp biasing in charging algorithm circuits. Use Value: ±1.5% output accuracy and 0.5% long-term stability ensure consistent charge termination thresholds over 1000 hours. |
Use Scenario: Delivering auxiliary 1.5V to chipset PCIe buffers and memory controller PHYs on server motherboards. IC Role / Device Role / Timing Role: Secondary LDO supporting high-speed signaling interfaces requiring low-impedance, low-noise supply. Use Value: TO-263-3 thermal performance (θJC = 4.15°C/W) sustains 3A continuous delivery without derating in confined board areas. |
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 |
|---|---|---|---|
| LD1085V15TR | STMicroelectronics part; 1.5V fixed, 3A, TO-220-3 package; θJC = 4.5°C/W; dropout 1.4V typ at 3A | Requires through-hole mounting; higher thermal resistance limits power density in compact designs | Prefer when legacy through-hole assembly is mandated or heatsink attachment is mechanical rather than solder-based |
| TPS7A8300RGRT | Texas Instruments part; 1.5V fixed, 3A, 5mm × 5mm VQFN; dropout 0.8V typ at 3A; integrated soft-start | Surface-mount QFN offers superior thermal performance (θJC = 2.5°C/W) but requires precise layout for thermal vias | Choose when ultra-low dropout (<0.9V) or programmable soft-start is required; not drop-in due to different pinout and footprint |
Compared with LD1085V15TR and TPS7A8300RGRT, the AZ1085S-1.5TRE1 provides optimal balance of proven reliability, TO-263-3 thermal interface simplicity, and cost-effective fixed-output regulation-ideal for industrial telecom and embedded computing where design reuse and thermal predictability outweigh ultra-low dropout needs.
Availability
AZ1085S-1.5TRE1 is available at Aetrix Electronics and suitable for microprocessor core supplies, telecom line card power, battery charger references, and motherboard auxiliary rails requiring stable component supply with full traceability and long-lifecycle support.
Supply support for AZ1085S-1.5TRE1 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
BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and power IC foundry and fabless designer specializing in high-reliability linear regulators, MOSFETs, and mixed-signal solutions for industrial and telecom markets.
The AZ1085 series was developed for high-current, low-dropout post-regulation in space-constrained embedded systems-emphasizing thermal robustness, fixed-output precision, and compatibility with standard SMT assembly processes.
FAQ
What is the maximum input voltage rating for AZ1085S-1.5TRE1?
The absolute maximum input voltage is 12V, but the recommended operating range is 3.0V to 6.0V for reliable 1.5V output regulation. Exceeding 6.0V increases power dissipation beyond safe limits at 3A load and risks thermal shutdown even with adequate heatsinking.
Does AZ1085S-1.5TRE1 require an external capacitor on the ADJ/GND pin?
No. The ADJ/GND pin is internally connected to ground for fixed-output versions like AZ1085S-1.5TRE1. It must be electrically tied to the system ground plane via PCB copper, but no external capacitor or resistor is needed-unlike adjustable variants which use this pin for feedback.
Can AZ1085S-1.5TRE1 be paralleled for higher current capability?
Paralleling is not recommended. The AZ1085S-1.5TRE1 lacks built-in current-sharing features such as remote sensing or master-slave control. Mismatched dropout voltages between units would cause uneven current distribution and potential thermal runaway.
What is the minimum load current required for stable regulation?
No minimum load current is specified-the device regulates stably from 0 mA to 3A. Unlike older LDOs, the AZ1085S-1.5TRE1 maintains output accuracy and PSRR performance down to zero load, verified across 0–125°C junction temperature per datasheet Figure 11.
AZ1085S-1.5TRE1 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:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.5V
- 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
AZ1085S-1.5TRE1 FAQ
1.How can I place an order for AZ1085S-1.5TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1085S-1.5TRE1 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 AZ1085S-1.5TRE1 reliable?
The price and inventory of AZ1085S-1.5TRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1085S-1.5TRE1 is usually 5 days.
3.What payment methods are accepted for AZ1085S-1.5TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1085S-1.5TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1085S-1.5TRE1?
AZ1085S-1.5TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1085S-1.5TRE1 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 AZ1085S-1.5TRE1?
For technical support, including AZ1085S-1.5TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1085S-1.5TRE1 requirements.
6.How does Aetrix verify that AZ1085S-1.5TRE1 is sourced from the original manufacturer or authorized distributors?
All AZ1085S-1.5TRE1 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 AZ1085S-1.5TRE1 meets industry standards.
7.What is the process for return or replacement of AZ1085S-1.5TRE1?
All AZ1085S-1.5TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1085S-1.5TRE1, 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 AZ1085S-1.5TRE1 part is unused and in its original packaging.
Return procedure for AZ1085S-1.5TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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