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Diodes Incorporated AZ317HTR-G1
- Part No.:
- AZ317HTR-G1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
AZ317HTR-G1.pdf
- Description:
- IC REG LINEAR POS ADJ 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,272
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Product details
Overview
AZ317HTR-G1 from Diodes Incorporated is a 3-terminal adjustable positive voltage regulator delivering 1A output current with 1.2V dropout at full load, ±1% reference voltage accuracy (1.25V), and integrated thermal shutdown and current limiting. It operates from 0°C to +125°C junction temperature and supports output voltages down to 1.25V using two external resistors - deployed in PC motherboards for stable core voltage regulation.
For engineers reviewing the AZ317HTR-G1 datasheet, AZ317HTR-G1 pinout, AZ317HTR-G1 application, or AZ317HTR-G1 equivalent, this device is selected for low-dropout, precision-adjustable DC-DC regulation in space-constrained power rails where thermal robustness and ±1% output tolerance are critical.
Technical Context
The AZ317HTR-G1 implements a trimmed bandgap reference with <100µA adjust pin current, enabling precise VOUT = VREF × (1 + R2/R1) configuration. Its internal current limiter is factory-trimmed to 1.5A typical, and on-chip thermal protection activates at +150°C with +25°C hysteresis.
It requires minimal external components: 0.1µF input capacitor (if near supply filter) and 1.0µF output capacitor for stability and transient response. Line regulation is 0.01%/V typical; load regulation is 0.2% typical across 10mA–1A output range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.25V ±1% - sets minimum output voltage and defines adjustment ratio accuracy |
| Dropout Voltage | 1.2V at 1A - enables regulation with only 1.2V headroom above VOUT, reducing power loss |
| Output Current | 1A continuous - supports mid-power digital subsystems without external pass devices |
| Line Regulation | 0.01%/V typical - ensures <±1.25mV output change per volt input variation at light load |
| Load Regulation | 0.2% typical - guarantees ≤6.6mV shift from 10mA to 1A load at 3.3V output |
| Thermal Shutdown | +150°C activation with +25°C hysteresis - prevents permanent damage during sustained overload |
| Junction Temp Range | 0°C to +125°C - qualified for industrial-grade motherboard and peripheral operation |
Pinout & Package
AZ317HTR-G1 is supplied in lead-free, halogen-free "Green" SOT223 package (3-pin, surface-mount). Thermal resistance is 15°C/W (junction-to-case), supporting up to ~2.5W dissipation at TC = 70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Input voltage supply terminal | Accepts unregulated DC input; must exceed VOUT by ≥1.2V for regulation |
| 2 (OUTPUT) | Regulated output voltage node | Delivers stable, adjustable VOUT; connects to load and output capacitor (1.0µF) |
| 3 (ADJ) | Reference voltage feedback node | Senses VREF = 1.25V; forms resistor divider with R1/R2 to set output voltage |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | 1.25V to ≥15V via external R1/R2 - enables single BOM part across multiple rail requirements |
| Trimmed Bandgap Reference | ±1% initial accuracy - eliminates need for post-manufacture calibration in cost-sensitive systems |
| Low Dropout Performance | 1.2V @ 1A - reduces heat generation and extends battery life in portable peripherals |
| Integrated Protection | Factory-trimmed current limit + thermal shutdown - removes need for discrete foldback or thermal sensors |
| Green Packaging | SOT223 with halogen/antimony-free molding compound - meets RoHS 3 and environmental compliance mandates |
Applications
| PC Motherboard | LCD Monitor |
|---|---|
|
Use Scenario: Regulating +3.3V or +5V auxiliary rails for chipset I/O, USB controllers, and fan drivers. IC Role / Device Role / Timing Role: Adjustable LDO voltage regulator providing clean, stable DC power independent of main VRM. Use Value: 1.2V dropout allows use with low-headroom buck converter outputs; ±1% accuracy ensures reliable logic-level margin. |
Use Scenario: Powering timing controllers, backlight inverters, and display interface ICs in compact LCD panels. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 12V or 5V system rail to precise 3.3V or adjustable bias voltage. Use Value: Low noise (<0.003% RMS) and 75dB ripple rejection prevent display artifacts and timing jitter. |
| Graphic Card | Network Interface Card |
|
Use Scenario: Supplying GPU memory I/O voltage (e.g., 1.5V or 1.8V) and auxiliary logic rails in PCIe add-in cards. IC Role / Device Role / Timing Role: Compact, thermally robust adjustable regulator mounted near high-speed memory interfaces. Use Value: SOT223 footprint minimizes PCB area; 15°C/W θJC enables direct heatsinking to copper pour for 1A loads. |
Use Scenario: Generating isolated 3.3V or 2.5V supplies for PHY transceivers, MAC controllers, and management microcontrollers. IC Role / Device Role / Timing Role: Secondary regulator ensuring stable voltage under dynamic Ethernet packet traffic-induced load transients. Use Value: Fast load transient response and 0.2% load regulation maintain signal integrity during burst-mode data transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LDR2G | Higher dropout (1.5V @ 100mA), ±2% VREF accuracy, SOIC-8 package | Lower current rating limits use to sub-100mA rails; larger footprint than SOT223 | Select when legacy LM317 compatibility or SOIC assembly is required over thermal performance |
| AP317SG-13 | Same 1.25V VREF, but 1.3V dropout @ 1A and no guaranteed green packaging | RoHS-compliant but not halogen-free; slightly reduced efficiency at low VIN-VOUT | Choose for cost-sensitive designs where "Green" compliance is not mandated and 0.1V dropout penalty is acceptable |
Compared with LM317LDR2G and AP317SG-13, AZ317HTR-G1 delivers tighter reference accuracy, lower dropout, and certified halogen-free construction - making it optimal for high-density, thermally constrained, and environmentally regulated industrial PCBs.
Availability
AZ317HTR-G1 is available at Aetrix Electronics and suitable for PC motherboard design, LCD monitor power systems, and network interface card development requiring stable component supply, consistent green-material compliance, and industrial temperature support.
Supply support for AZ317HTR-G1 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 high-reliability power management, signal integrity, and protection solutions.
The AZ317 belongs to Diodes' precision adjustable LDO regulator product line, engineered for industrial and computing applications demanding tight output tolerance, low dropout, and robust thermal protection in compact packages.
FAQ
What is the minimum input-to-output voltage differential required for regulation?
The AZ317HTR-G1 requires a minimum dropout voltage of 1.2V at 1A output current to maintain regulation. At lighter loads (e.g., 10mA), dropout drops to ~0.6V. Input voltage must exceed the desired output by at least this margin; for example, generating 3.3V requires VIN ≥ 4.5V at full load.
Can AZ317HTR-G1 be used without an output capacitor?
No - a minimum 1.0µF output capacitor (tantalum or ceramic) is required for stability and transient response, as specified in the datasheet's Typical Applications Circuit. Omitting it risks oscillation, overshoot, or thermal runaway under dynamic load conditions.
How does the ADJ pin current affect output voltage accuracy?
The ADJ pin draws ≤100µA, contributing a small error term (IADJ × R2) to the output equation VOUT = VREF × (1 + R2/R1). With R2 ≤ 2.4kΩ (for 12V output), this adds ≤0.24mV error - negligible compared to the ±1% VREF tolerance and load/line regulation specs.
Is AZ317HTR-G1 pin-compatible with standard LM317 footprints?
Yes - the SOT223 package uses identical 1-2-3 pinout (INPUT-OUTPUT-ADJ) as LM317 variants in SOT223, enabling drop-in replacement in existing layouts. However, thermal performance differs: AZ317 offers lower dropout and tighter VREF tolerance, while LM317 may require larger output capacitance for stability.
AZ317HTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 13.7V
- Voltage Dropout (Max):
- 1.3V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 75dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
AZ317HTR-G1 FAQ
1.How can I place an order for AZ317HTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ317HTR-G1 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 AZ317HTR-G1 reliable?
The price and inventory of AZ317HTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ317HTR-G1 is usually 5 days.
3.What payment methods are accepted for AZ317HTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ317HTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ317HTR-G1?
AZ317HTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ317HTR-G1 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 AZ317HTR-G1?
For technical support, including AZ317HTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ317HTR-G1 requirements.
6.How does Aetrix verify that AZ317HTR-G1 is sourced from the original manufacturer or authorized distributors?
All AZ317HTR-G1 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 AZ317HTR-G1 meets industry standards.
7.What is the process for return or replacement of AZ317HTR-G1?
All AZ317HTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ317HTR-G1, 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 AZ317HTR-G1 part is unused and in its original packaging.
Return procedure for AZ317HTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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