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Diodes Incorporated AZ1117D-ADJTRE1
- Part No.:
- AZ1117D-ADJTRE1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
AZ1117D-ADJTRE1.pdf
- Description:
- IC REG LINEAR POS ADJ 1A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,738
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Product details
Overview
AZ1117D-ADJTRE1 from Diodes Incorporated is an adjustable low-dropout linear regulator delivering 1A output current with 1.15V dropout at full load, ±1% reference voltage accuracy (1.25V), and integrated thermal shutdown and current limiting. It operates across –40°C to +125°C and is used in PC motherboard VRM stages requiring stable 1.25–12V bias rails.
For engineers reviewing the AZ1117D-ADJTRE1 datasheet, AZ1117D-ADJTRE1 pinout, AZ1117D-ADJTRE1 application, or AZ1117D-ADJTRE1 equivalent, key selection criteria include dropout voltage at 1A, adjustable output range (1.25–12V), thermal shutdown threshold (+150°C), SOT252-2 (3/4/5) package thermal resistance (17°C/W), and minimum load current requirement (1.7–5mA).
Technical Context
The AZ1117D-ADJTRE1 implements a trimmed bandgap reference and error amplifier driving a PNP pass transistor, enabling precise output regulation via external R1/R2 feedback. Its current-limit circuit is factory-trimmed to 1.25–1.35A, and thermal shutdown activates at +150°C with +25°C hysteresis.
It supports input voltages up to 15V (recommended) and 20V (absolute max), requires ≥1.25V headroom for regulation, and achieves 60–75dB ripple rejection at 120Hz with 22µF tantalum output capacitance - critical for noise-sensitive analog subsystems in telecom and peripheral equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports logic core and I/O rail power in embedded controllers and interface modules. |
| Dropout Voltage | 1.15V at 1A - enables operation from 5V input to generate 3.3V/2.5V rails with minimal power loss. |
| Reference Voltage | 1.250V ±1% - sets output accuracy for adjustable configurations using two external resistors. |
| Thermal Shutdown | +150°C activation with +25°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Load Regulation | 0.2–0.4% over 10mA–1A - ensures stable voltage under dynamic load steps in CPU or GPU auxiliary supplies. |
| Ripple Rejection | 60–75dB at 120Hz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Operating Temp | –40°C to +125°C - qualified for industrial and telecom environments without derating. |
Pinout & Package
Package: TO252-2 (3-pin variant, also labeled TO252-2 (3)), surface-mount, exposed thermal pad, RoHS-compliant lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Regulator Input | Accepts unregulated DC input (≤15V recommended); must be decoupled with ≥10µF ceramic capacitor. |
| 2 (OUTPUT) | Regulated Output | Delivers adjustable output (1.25–12V); requires ≥22µF low-ESR output capacitor for stability. |
| 3 (ADJ) | Feedback Reference | Connects to resistor divider (R1/R2) to set output; draws 60–120µA; minimum 1.7mA load required for regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout | 1.15V at 1A enables high-efficiency conversion from 5V to 3.3V/2.5V rails where headroom is constrained. |
| Trimmed Current Limit | 1.25–1.35A short-circuit protection prevents damage during output faults without external sensing. |
| On-chip Thermal Shutdown | +150°C trip with +25°C hysteresis ensures self-recovery after transient overloads without manual reset. |
| Adjustable Output Range | 1.25V to 12V via two external resistors - eliminates need for multiple fixed-voltage SKUs in BOMs. |
| High Accuracy Reference | ±1% VREF (1.25V) guarantees ≤±2% total output tolerance across temperature and line/load conditions. |
Applications
| PC Motherboard Power | LCD Monitor Bias Supply |
|---|---|
Use Scenario: Providing clean 1.8V or 2.5V for DDR memory termination and chipset I/O buffers on ATX mainboards. IC Role / Device Role / Timing Role: Low-noise post-regulator stabilizing switched-mode supply outputs before delivery to sensitive digital interfaces. Use Value: 0.003% RMS output noise and 75dB ripple rejection prevent timing jitter and bit errors in high-speed memory buses. | Use Scenario: Generating 5V and 12V bias rails for LCD panel drivers and backlight control ICs in 24-inch desktop monitors. IC Role / Device Role / Timing Role: Adjustable LDO supplying programmable voltage to TFT gate drivers and gamma correction DACs. Use Value: 1.25–12V adjustability allows single BOM part to support multiple panel models with varying voltage requirements. |
| Telecom Line Card | Printer Engine Control |
Use Scenario: Delivering isolated 3.3V for Ethernet PHYs and management microcontrollers on carrier-grade DSLAM line cards. IC Role / Device Role / Timing Role: Primary local regulator converting -48V-derived 5V intermediate bus to logic-level supply with ESD-hardened I/O. Use Value: 2000V HBM ESD rating and –40°C to +125°C operation ensure reliability in uncontrolled telco cabinet environments. | Use Scenario: Powering stepper motor drivers and sensor signal conditioning circuits in laser printer engine control boards. IC Role / Device Role / Timing Role: Stable 5V source for analog front-ends measuring toner density and paper path sensors. Use Value: 0.5% temperature stability and 0.3% long-term drift minimize calibration drift over 1000hrs of continuous 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 |
|---|---|---|---|
| MIC29302WU | 2.5A output, 0.4V dropout at 1A, SO-8 package, higher quiescent current (30mA) | Better suited for high-current, ultra-low-dropout needs; requires larger PCB area and different layout | Select when >1A load or <1V dropout is mandatory; verify thermal design for SO-8 footprint |
| LD1085V33 | Fixed 3.3V output only, 1.5A current, TO220 package, no adjustable option | Limited to single-output systems; lacks flexibility for multi-rail designs | Choose only if 3.3V is sole requirement and through-hole mounting is preferred |
Compared with MIC29302WU and LD1085V33, the AZ1117D-ADJTRE1 offers optimal balance of adjustability, thermal performance in TO252, and cost-effective 1A capability - making it ideal for multi-rail embedded systems where board space and BOM simplification matter.
Availability
AZ1117D-ADJTRE1 is available at Aetrix Electronics and suitable for PC motherboard power delivery, LCD monitor bias supplies, telecom line card regulation, and printer engine control requiring stable component supply across industrial temperature ranges.
Supply support for AZ1117D-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AZ1117 series belongs to Diodes' precision linear regulator product line, designed specifically for high-accuracy, thermally robust voltage regulation in computing, consumer, and industrial power subsystems.
FAQ
What is the minimum required output capacitor for stable operation?
The AZ1117D-ADJTRE1 requires a minimum 22µF low-ESR tantalum or polymer capacitor at the output for phase margin and transient stability. Ceramic capacitors may be used if ≥10µF and series resistance ≥30mΩ is added to emulate ESR; insufficient capacitance causes oscillation under load transients.
Can this part replace a fixed-output AZ1117 variant on an existing PCB?
Yes, but only if the PCB layout provides pads for the ADJ pin and space for two external resistors (R1=150Ω, R2 variable). Fixed-output versions tie ADJ to GND or omit the pin; direct substitution requires routing changes and validation of loop stability with new feedback network.
What is the purpose of the minimum load current specification?
The AZ1117D-ADJTRE1 requires 1.7–5mA minimum load on the OUTPUT pin to maintain regulation, due to internal bias current paths. Without it, the output voltage rises uncontrollably. A 1.5kΩ–5.6kΩ pull-down resistor to ground satisfies this requirement in light-load or standby modes.
How does thermal resistance differ between TO252-2 (3) and TO252-2 (4) packages?
The TO252-2 (3) variant (used in AZ1117D-ADJTRE1) has θJC = 17°C/W, while TO252-2 (4) adds a fourth pin for enhanced thermal conduction, reducing θJC to ~12°C/W. Both share identical footprint and pinout; the (4) version requires PCB copper pour under the exposed pad connected to GND for optimal performance.
AZ1117D-ADJTRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- AZ1117
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 13.75V
- Voltage Dropout (Max):
- 1.25V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 75dB (120Hz)
- Control Features:
- -
- Protection Features:
- Thermal Shutdown
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252-3
AZ1117D-ADJTRE1 FAQ
1.How can I place an order for AZ1117D-ADJTRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ1117D-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 AZ1117D-ADJTRE1 reliable?
The price and inventory of AZ1117D-ADJTRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ1117D-ADJTRE1 is usually 5 days.
3.What payment methods are accepted for AZ1117D-ADJTRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ1117D-ADJTRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ1117D-ADJTRE1?
AZ1117D-ADJTRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ1117D-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 AZ1117D-ADJTRE1?
For technical support, including AZ1117D-ADJTRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ1117D-ADJTRE1 requirements.
6.How does Aetrix verify that AZ1117D-ADJTRE1 is sourced from the original manufacturer or authorized distributors?
All AZ1117D-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 AZ1117D-ADJTRE1 meets industry standards.
7.What is the process for return or replacement of AZ1117D-ADJTRE1?
All AZ1117D-ADJTRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ1117D-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 AZ1117D-ADJTRE1 part is unused and in its original packaging.
Return procedure for AZ1117D-ADJTRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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