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Diodes Incorporated AZ317T-E1
- Part No.:
- AZ317T-E1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-3
- Datasheet:
-
AZ317T-E1.pdf
- Description:
- IC REG LINEAR POS ADJ 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,270
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Product details
Overview
AZ317T-E1 from Diodes Incorporated is a three-terminal adjustable positive voltage regulator with 1.2V dropout at 1A output current, ±1% reference voltage accuracy (1.25V), and integrated thermal shutdown and current limiting. It delivers stable 1.25–15V output via external R1/R2 resistors and is used in PC motherboards, LCD monitors, and telecom equipment requiring low-dropout, high-accuracy regulation.
For engineers reviewing the AZ317T-E1 datasheet, AZ317T-E1 pinout, AZ317T-E1 application, or AZ317T-E1 equivalent, key selection criteria include dropout voltage at full load, reference voltage tolerance, thermal shutdown threshold, package thermal resistance (TO220-3: 4.5°C/W), and RoHS-compliant lead-free construction.
Technical Context
The AZ317T-E1 implements a trimmed bandgap reference to maintain 1.25V ±1% VREF across temperature and load. Its internal current limiter is factory-trimmed to 1.5A typical short-circuit current and provides controlled foldback under overload.
Thermal protection activates at +150°C junction temperature with +25°C hysteresis, enabling safe recovery after fault clearance. The device operates over 0°C to +125°C junction temperature with input voltage up to 20V and requires only 3.5mA minimum load current for regulation stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.25V ±1% - sets precise output voltage via R1/R2 divider; enables 1.25–15V programmable range |
| Dropout Voltage | 1.2V at 1A - allows operation with minimal VIN–VOUT margin, critical for low-input-voltage systems |
| Line Regulation | 0.01%/V typical - ensures <±0.1mV/V output change across input variation, vital for stable rail generation |
| Load Regulation | 0.2% typical - maintains output within ±6.6mV over 10mA–1A load swing at 3.3V output |
| Thermal Shutdown | +150°C activation with +25°C hysteresis - prevents permanent damage during sustained overload or high ambient |
| Current Limit | 1.5A typical - protects against short circuits while sustaining >1A continuous output under derated conditions |
| Adjust Pin Current | <100µA - minimizes error in VOUT = VREF × (1+R2/R1) calculation; enables high-resistor-divider designs |
Pinout & Package
Package: TO220-3 (3-pin through-hole power package with metal tab for heatsinking; RoHS-compliant, lead-free finish).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: INPUT | Unregulated input supply connection | Accepts 2V above VOUT to 20V max; must be decoupled with ≥0.1µF ceramic near pin |
| 2: OUTPUT | Regulated output voltage node | Delivers up to 1A; requires ≥1.0µF tantalum or ceramic capacitor for stability and transient response |
| 3: ADJ | Reference feedback terminal | Connects to resistor divider (R1 to GND, R2 to OUTPUT); sets VOUT = 1.25V × (1+R2/R1) |
Key Features
| Feature | Design Value |
|---|---|
| Trimmed bandgap reference | 1.25V ±1% accuracy over 0–125°C - eliminates need for external calibration in precision rails |
| Low dropout architecture | 1.2V @ 1A - enables use with 3.3V or 5V inputs to generate 2.5V/3.3V outputs without excessive heat dissipation |
| Factory-trimmed current limit | 1.5A typical short-circuit current - ensures predictable fault behavior and simplifies PCB fuse selection |
| On-chip thermal shutdown | +150°C trip with +25°C hysteresis - autonomously recovers after cooling, avoiding manual reset circuitry |
| Lead-free & halogen-free packaging | TO220-3 RoHS-compliant (AZ317T-E1) - meets EU Directive 2015/863/EU and supports "Green" compliance requirements |
Applications
| PC Motherboard Power Rails | LCD Monitor Logic Supply |
|---|---|
|
Use Scenario: Generating clean 3.3V or 5V auxiliary rails from ATX 12V or 5VSB sources on desktop motherboard VRMs. IC Role / Device Role / Timing Role: Adjustable LDO regulator providing low-noise, thermally robust core logic voltage. Use Value: 1.2V dropout enables efficient conversion from 5VSB to 3.3V; ±1% VREF ensures chipset I/O voltage compliance per Intel/AMD specs. |
Use Scenario: Supplying stable 1.8V or 2.5V to LCD panel timing controllers and interface ICs in consumer monitors. IC Role / Device Role / Timing Role: Precision voltage regulator maintaining display controller VDD within tight tolerance bands. Use Value: 0.2% load regulation prevents pixel flicker during backlight dimming transients; thermal hysteresis avoids intermittent shutdown during enclosure heating. |
| Network Interface Card (NIC) | Telecom Line Card Bias |
|
Use Scenario: Delivering regulated 1.2V or 1.8V to PCIe-based NIC PHYs and MAC processors in enterprise servers. IC Role / Device Role / Timing Role: Low-dropout adjustable regulator powering high-speed serial interface logic. Use Value: 100µA adjust pin current allows high-value resistor dividers, reducing quiescent current in always-on management subsystems. |
Use Scenario: Providing isolated bias voltage for analog front-end amplifiers and line drivers in carrier-grade DSLAM line cards. IC Role / Device Role / Timing Role: Robust linear regulator supplying noise-sensitive analog signal chain components. Use Value: 75dB ripple rejection at 120Hz suppresses AC line noise coupling into voice-band signals; TO220-3 package enables bolt-on heatsinking for 24/7 operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LDR2G (ON Semiconductor) | Higher dropout (1.7V @ 100mA), ±2% VREF, SOT-223 only - no TO220 option | Limited to low-current (<100mA) applications; unsuitable for 1A loads or high-ambient telecom environments | Select when cost sensitivity outweighs performance; avoid for >100mA or thermal-limited layouts |
| TLV1117-33CKC (Texas Instruments) | Fixed 3.3V output, 1.2V dropout @ 800mA, ±2% tolerance - no adjustability or 1A rating | Only supports fixed 3.3V; lacks external resistor programming and full 1A capability of AZ317T-E1 | Choose only if system requires fixed 3.3V and load ≤800mA; cannot replace AZ317T-E1 in adjustable or 1A designs |
Compared with LM317LDR2G and TLV1117-33CKC, the AZ317T-E1 uniquely combines 1A capability, 1.2V dropout, ±1% VREF, and TO220-3 thermal performance - making it the sole fit for high-current, adjustable, thermally demanding LDO applications.
Availability
AZ317T-E1 is available at Aetrix Electronics and suitable for PC motherboard power rails, LCD monitor logic supplies, and telecom line card biasing requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for AZ317T-E1 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' adjustable LDO regulator product line, engineered for high-accuracy, low-dropout DC-DC conversion in computing, display, and communications infrastructure where thermal resilience and voltage precision are critical.
FAQ
What is the maximum input voltage for AZ317T-E1?
The absolute maximum input voltage is 20V, but recommended operating input is VOUT + 2V to 15V. Exceeding 15V reduces power dissipation headroom and accelerates thermal stress; operation above 20V risks permanent damage per Absolute Maximum Ratings.
Can AZ317T-E1 be used in parallel for higher current?
No - AZ317T-E1 lacks built-in current-sharing features. Parallel operation causes unequal current distribution due to VREF tolerance and dropout variance, risking thermal runaway. Use a single AZ317T-E1 for up to 1A or select a higher-current regulator like AZ317DTR-E1 (TO252-2) if board space permits.
Is an input capacitor required for stable operation?
Yes - a minimum 0.1µF ceramic capacitor is required between INPUT and GND if the regulator is located more than 2 inches from the main power supply filter. This prevents oscillation and improves line transient response, especially with long PCB traces or high-ESR bulk capacitors.
How does thermal shutdown behave during continuous overload?
When junction temperature reaches +150°C, the AZ317T-E1 shuts down output and remains off until temperature drops by +25°C (to ~125°C). This hysteresis prevents rapid cycling; full recovery requires natural or forced cooling - no external reset is needed.
AZ317T-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-3
AZ317T-E1 FAQ
1.How can I place an order for AZ317T-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ317T-E1 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 AZ317T-E1 reliable?
The price and inventory of AZ317T-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ317T-E1 is usually 5 days.
3.What payment methods are accepted for AZ317T-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ317T-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ317T-E1?
AZ317T-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ317T-E1 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 AZ317T-E1?
For technical support, including AZ317T-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ317T-E1 requirements.
6.How does Aetrix verify that AZ317T-E1 is sourced from the original manufacturer or authorized distributors?
All AZ317T-E1 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 AZ317T-E1 meets industry standards.
7.What is the process for return or replacement of AZ317T-E1?
All AZ317T-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ317T-E1, 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 AZ317T-E1 part is unused and in its original packaging.
Return procedure for AZ317T-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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