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Diodes Incorporated AZ1084S-1.8TRE1
- Part No.:
- AZ1084S-1.8TRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
AZ1084S-1.8TRE1.pdf
- Description:
- IC REG LINEAR 1.8V 5A TO263-2
- Quantity:
- Payment:
- Shipping:
Inventory:3,211
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Product details
Overview
AZ1084S-1.8TRE1 from Diodes Incorporated is a fixed-output 1.8 V, 5 A low dropout linear regulator in TO-263 (D²PAK) package, featuring 1.3 V typical dropout at full load, integrated thermal shutdown and current limiting, and ±1% output voltage accuracy over 0°C to +125°C junction temperature. It delivers stable microprocessor core supply for embedded RISC systems requiring high-current, low-noise DC/DC post-regulation.
For engineers reviewing the AZ1084S-1.8TRE1 datasheet, AZ1084S-1.8TRE1 pinout, AZ1084S-1.8TRE1 application, or AZ1084S-1.8TRE1 equivalent, key selection criteria include dropout voltage at 5 A, thermal resistance (θJA = 60°C/W), load regulation (≤15 mV), line regulation (≤6 mV), and compatibility with standard TO-263 PCB footprints and thermal pads.
Technical Context
The AZ1084S-1.8TRE1 uses a trimmed band-gap reference and PNP pass transistor architecture to achieve low dropout while maintaining stability under dynamic load transients. Its internal current limit (6.5 A) and thermal protection activate independently to prevent damage during overload or elevated ambient conditions.
It operates across an input range of 3.3 V to 6 V for the 1.8 V version, supports minimum load current as low as 3 mA, and delivers 72 dB PSRR at 120 Hz with 25 µF tantalum output capacitance - enabling clean power delivery in noise-sensitive analog and digital mixed-signal domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±1% (1.782–1.818 V) at 10 mA to 5 A load, ensuring compliance with 1.8 V I/O and core rails for ARM Cortex-M and RISC-V SoCs. |
| Dropout Voltage | 1.3 V typical at 5 A, enabling operation from 3.3 V input - critical for efficient post-regulation after buck converters. |
| Output Current | 5 A continuous, supporting high-power FPGA I/O banks or multi-core microcontroller subsystems without external parallel devices. |
| Thermal Resistance | θJA = 60°C/W (TO-263), allowing ~3.3 W max power dissipation at 25°C ambient before thermal shutdown. |
| Load Regulation | ≤15 mV (0–5 A), minimizing voltage sag during CPU burst-mode operation in embedded applications. |
| Line Regulation | ≤6 mV (3.3–10 V input), ensuring stable output despite upstream switching supply ripple or input rail variation. |
| PSRR | 72 dB at 120 Hz, suppressing low-frequency ripple from AC/DC adapters or buck converter switching artifacts. |
Pinout & Package
Package: TO-263 (D²PAK), surface-mount, thermally enhanced with exposed tab (pin 2) connected to output. Dimensions: 10.66 mm × 9.65 mm × 4.82 mm (0.420″ × 0.380″ × 0.190″).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | INPUT | Unregulated input supply connection; requires ≥10 µF ceramic input capacitor for stability and EMI suppression. |
| 2 | OUTPUT (Tab) | Regulated 1.8 V output and thermal conduction path; must be soldered to large copper pour for heatsinking. |
| 3 | GND | Ground reference for internal band-gap and error amplifier; requires low-inductance connection to power plane. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout operation | 1.3 V at 5 A enables use with 3.3 V intermediate bus, reducing system power loss by up to 35% vs. legacy 2.5 V LDOs. |
| Integrated thermal protection | Shuts down at +150°C junction temperature and auto-recovers, eliminating need for external thermal monitoring circuitry. |
| Current limiting | 6.5 A foldback limit prevents catastrophic failure during short-circuit events on downstream logic or memory rails. |
| Lead-free & halogen-free | RoHS-compliant and "Green" certified (Br+Cl <1500 ppm, Sb <1000 ppm), meeting IPC-1752A and automotive AEC-Q200 material requirements. |
Applications
| Microprocessor Core Supply | Battery Charger Post-Regulation |
|---|---|
|
Use Scenario: Powering ARM Cortex-A/M series SoC core voltage rails in industrial gateways and edge AI modules. IC Role / Device Role / Timing Role: Primary 1.8 V core regulator delivering low-noise, high-current DC supply with fast transient response to CPU DVFS transitions. Use Value: Maintains <±15 mV output deviation during 0–5 A load steps, preventing CPU reset or timing violations during burst execution. |
Use Scenario: Final-stage regulation after a 5 V switching charger IC supplying Li-ion battery management circuits. IC Role / Device Role / Timing Role: Low-noise linear post-regulator filtering switching ripple to meet battery fuel-gauge ADC reference stability requirements. Use Value: 72 dB PSRR at 120 Hz reduces charger ripple to <15 µV RMS, improving coulomb counting accuracy by >0.5% over full charge cycle. |
| Desktop PC VRM Auxiliary Rail | RISC-V Development Platform |
|
Use Scenario: Generating auxiliary 1.8 V I/O rail for PCIe Gen3 retimers and USB 3.0 PHYs on ATX motherboard designs. IC Role / Device Role / Timing Role: High-current, low-impedance local regulator decoupling high-speed serial interface power domains from main VRM noise. Use Value: 60°C/W θJA allows direct mounting on layer-2 copper with no heatsink, simplifying layout and reducing BOM count. |
Use Scenario: On-board 1.8 V supply for RISC-V-based FPGA development boards with dual-core RV32IMAC processors and DDR3L interfaces. IC Role / Device Role / Timing Role: Fixed-output LDO providing clean, stable core voltage independent of upstream DC/DC efficiency trade-offs. Use Value: ±1% initial tolerance and <0.5% long-term drift ensure consistent timing margin across 1000-hour reliability testing per JEDEC JESD22-A108. |
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 |
|---|---|---|---|
| AP2112K-1.8TRG1 | 250 mA max output, SOT-23-5 package, 300 mV dropout at 250 mA | Not suitable for >1 A loads; limited thermal capability in compact footprint | Select only for space-constrained, low-current bias rails - not a functional replacement for 5 A requirement. |
| LT1963AES8-1.8#TRPBF | 1.5 A output, SO-8 package, 340 mV dropout at 1.5 A, higher PSRR (78 dB) | Limited current capacity and smaller thermal mass; requires external thermal pad design | Use where ultra-low noise is prioritized over current; verify thermal derating above 1 A in SO-8 layout. |
Compared with AP2112K-1.8TRG1 and LT1963AES8-1.8#TRPBF, AZ1084S-1.8TRE1 uniquely satisfies 5 A continuous load with TO-263 thermal performance, making it irreplaceable in high-power embedded core supply roles without paralleling or redesign.
Availability
AZ1084S-1.8TRE1 is available at Aetrix Electronics and suitable for microprocessor core supply, battery charger post-regulation, and desktop PC auxiliary rail applications requiring stable component supply and long-lifecycle support.
Supply support for AZ1084S-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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AZ1084 series belongs to Diodes' high-current LDO portfolio, designed specifically for post-regulation and core voltage delivery in embedded systems where thermal robustness and output accuracy outweigh switching efficiency trade-offs.
FAQ
Is AZ1084S-1.8TRE1 still in active production?
No - AZ1084S-1.8TRE1 is marked obsolete in Diodes' official documentation (DS36598 Rev. 4, Nov 2021), with migration recommended to the AZ1084C series. However, Aetrix Electronics maintains legacy inventory with full traceability and offers engineering support for last-time buy and obsolescence mitigation planning.
What is the recommended input capacitor for stable operation?
A minimum 10 µF X5R/X7R ceramic capacitor placed within 5 mm of the INPUT and GND pins is required. Diodes specifies 10 µF for stability across all operating conditions; adding a 22 µF tantalum in parallel improves low-frequency ripple rejection without compromising phase margin.
Can AZ1084S-1.8TRE1 be used without a heatsink?
Yes, when ambient temperature remains ≤45°C and power dissipation stays below 3.3 W (i.e., VIN ≤4.5 V at 5 A). For sustained 5 A operation above 45°C ambient, a 2-in² copper pour on inner layer 2 with thermal vias to internal ground planes is mandatory to maintain TJ ≤125°C.
Does AZ1084S-1.8TRE1 require an output capacitor for stability?
Yes - a minimum 22 µF low-ESR tantalum or polymer capacitor is required at the OUTPUT pin. Ceramic capacitors alone are insufficient due to ESR dependency in the control loop; Diodes validates stability only with ≥22 µF and 100–500 mΩ ESR, as shown in Figure 12 of DS36598.
AZ1084S-1.8TRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- 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 @ 5A
- Current - Output:
- 5A
- 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
AZ1084S-1.8TRE1 FAQ
1.How can I place an order for AZ1084S-1.8TRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1084S-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 AZ1084S-1.8TRE1 reliable?
The price and inventory of AZ1084S-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 AZ1084S-1.8TRE1 is usually 5 days.
3.What payment methods are accepted for AZ1084S-1.8TRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1084S-1.8TRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1084S-1.8TRE1?
AZ1084S-1.8TRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1084S-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 AZ1084S-1.8TRE1?
For technical support, including AZ1084S-1.8TRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1084S-1.8TRE1 requirements.
6.How does Aetrix verify that AZ1084S-1.8TRE1 is sourced from the original manufacturer or authorized distributors?
All AZ1084S-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 AZ1084S-1.8TRE1 meets industry standards.
7.What is the process for return or replacement of AZ1084S-1.8TRE1?
All AZ1084S-1.8TRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1084S-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 AZ1084S-1.8TRE1 part is unused and in its original packaging.
Return procedure for AZ1084S-1.8TRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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