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Diodes Incorporated ZLDO1117G25TA
- Part No.:
- ZLDO1117G25TA
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ZLDO1117G25TA.pdf
- Description:
- IC REG LINEAR 2.5V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,133
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Product details
Overview
ZLDO1117G25TA from Diodes Incorporated is a fixed-output 2.5V, 1A low dropout linear regulator in SOT223 package, featuring 1.2V max dropout at full load, ±2% output voltage tolerance over industrial temperature range (−40°C to +125°C), and compatibility with MLCC output capacitors down to 4.7µF. It delivers stable power for 2.5V logic rails in automotive I/O interfaces and industrial microcontroller peripherals.
For engineers reviewing the ZLDO1117G25TA datasheet, ZLDO1117G25TA pinout, ZLDO1117G25TA application, or ZLDO1117G25TA equivalent, key selection criteria include dropout voltage under 1.2V at 1A, thermal shutdown behavior at 150°C, AEC-Q100 Grade 2 qualification, and stability with low-ESR ceramic capacitors - all critical for high-reliability embedded power design.
Technical Context
The ZLDO1117G25TA employs an internal bandgap reference (1.25V) and error amplifier to regulate output voltage with fast transient response and 60–80dB ripple rejection at 120Hz. Its quiescent current remains ≤10mA across input voltages up to 18V, enabling efficient operation in battery-backed or wide-input systems.
Thermal protection activates at ~150°C junction temperature, forcing output shutdown until die cools; combined with θJA = 107°C/W (SOT223), this defines safe continuous power dissipation limits. Load regulation is specified as ≤8mV (typ.) at 1A, and line regulation holds ≤0.2% across 3.9V–12V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±2% (guaranteed over −40°C to +125°C, 0–1A load) |
| Dropout Voltage | Max 1.2V at 1A load (enables regulation with VIN ≥ 3.7V) |
| Output Current | 1A continuous (with thermal derating above 85°C ambient) |
| Input Voltage Range | 2.7V to 18V (minimum 3.9V required for full-load regulation at 2.5V out) |
| Ripple Rejection | 60–80dB at 120Hz (supports clean supply for noise-sensitive analog/RF circuitry) |
| Thermal Shutdown | Activates at ~150°C junction temperature (self-protecting during overload or poor heatsinking) |
| Capacitor Compatibility | Stable with 4.7µF X7R MLCC (ESR ≤ 0.5Ω); no tantalum required |
Pinout & Package
SOT223-3L package with exposed thermal pad (pin 3 tab connected to VOUT); footprint optimized for PCB heat spreading using 2 oz copper and 5.6mm × 5.6mm pad per Diodes AP02001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj/GND) | Reference node / ground return | Internally tied to GND for fixed-output variants; provides feedback reference point for regulation loop |
| 2 (VOUT) | Regulated output | Delivers 2.5V ±2%; requires ≥4.7µF MLCC (0.05–0.5Ω ESR) to ground for stability |
| 3 (VIN) | Unregulated input | Accepts 2.7–18V; must exceed VOUT by ≥1.3V for proper regulation; connects to bulk storage capacitor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualified | Validated for automotive applications requiring −40°C to +125°C operation and PPAP support |
| MLCC-compatible stability | Eliminates need for higher-cost tantalum capacitors; reduces board area and cost in space-constrained designs |
| Fast transient response | Maintains <±10mV output deviation during 100mA→500mA load steps (with 4.7µF MLCC) |
| Low quiescent current | ≤10mA at zero load enables use in always-on subsystems without excessive standby loss |
| Built-in current limiting | Clamps output at ~1.1A (typ.) to prevent damage during short-circuit events |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Expansion Card |
|---|---|
|
Use Scenario: Powering 2.5V CAN transceiver interface circuitry in door module ECUs. IC Role / Device Role / Timing Role: Primary 2.5V rail regulator supplying bias to CAN FD physical layer ICs and level-shifters. Use Value: 1.2V dropout allows direct regulation from 12V battery (with transient clamping), while AEC-Q100 Grade 2 ensures reliability across vehicle lifetime. |
Use Scenario: Generating local 2.5V supply for isolated digital input conditioning circuits on modular I/O cards. IC Role / Device Role / Timing Role: Local point-of-load regulator delivering clean, stable voltage to optocoupler drivers and ADC reference buffers. Use Value: 80dB ripple rejection suppresses switching noise from upstream DC/DC converters, preserving signal integrity in 16-bit analog acquisition paths. |
| Medical Patient Monitor Sensor Interface | Networking Equipment Management Controller |
|
Use Scenario: Supplying 2.5V to low-power biopotential amplifiers and SAR ADC front-ends in portable ECG modules. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source for precision analog signal chain biasing. Use Value: ±2% tolerance and <8mV load regulation ensure consistent gain calibration across temperature and load, meeting IEC 60601 accuracy requirements. |
Use Scenario: Providing 2.5V auxiliary rail to BMC (Baseboard Management Controller) SoC and SPI flash memory in server motherboards. IC Role / Device Role / Timing Role: Secondary LDO supporting non-critical but timing-sensitive management functions during main CPU power sequencing. Use Value: Fast transient response prevents brownout during BMC firmware updates, avoiding system-level watchdog timeouts or configuration corruption. |
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 |
|---|---|---|---|
| TLV1117-25CDCR | Higher dropout (1.3V typ. at 1A), wider VIN range (up to 15V), no AEC-Q100 qualification | Limited to commercial-grade industrial use; unsuitable for automotive environments | Select when cost sensitivity outweighs automotive qualification and thermal margin is sufficient |
| AP2112K-2.5TRG1 | Lower quiescent current (60µA), smaller SOT-23-5 package, 0.8V dropout at 300mA (not rated at 1A) | Not suitable for 1A continuous loads; requires derating or parallel configuration | Prefer for ultra-low-power, space-constrained applications below 300mA load |
Availability
ZLDO1117G25TA is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, medical sensor interfaces, and networking baseboard management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZLDO1117G25TA 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 devices, with emphasis on high-reliability power management and signal integrity solutions for automotive and industrial markets.
The ZLDO1117 series belongs to Diodes' high-precision LDO portfolio, engineered specifically for demanding applications requiring AEC-Q100 qualification, low dropout, and robust MLCC compatibility - targeting next-generation automotive ECUs and industrial edge controllers.
FAQ
What is the minimum input voltage required for regulation at full 1A load?
The ZLDO1117G25TA requires VIN ≥ 3.7V to maintain regulation at 1A load, based on its maximum 1.2V dropout specification and 2.5V nominal output. Below this, the device enters dropout mode with unregulated output. The datasheet specifies 3.9V minimum for guaranteed performance across temperature and process variation.
Can this regulator be used with 2.2µF MLCC output capacitors?
No - the ZLDO1117G25TA requires a minimum 4.7µF MLCC (X7R dielectric, ESR 0.05–0.5Ω) for guaranteed stability. Using 2.2µF violates the stability condition and may cause oscillation or poor transient response, as confirmed by Diodes' SOA testing and application note AP02001.
Does the SOT223 package require soldering the thermal pad to PCB ground?
Yes - the tab (pin 3) is electrically connected to VOUT and serves as the primary thermal path. Diodes' recommended layout (AP02001) specifies soldering the exposed pad to a ≥5.6mm × 5.6mm 2 oz copper thermal pad tied to the VOUT net to achieve θJA = 107°C/W and prevent thermal shutdown under 1A load.
Is the 2% output tolerance inclusive of initial accuracy, line, load, and temperature effects?
Yes - the ±2% tolerance is a total error specification covering initial accuracy, line regulation (0.2%), load regulation (≤8mV), and temperature drift (0.5%) across −40°C to +125°C, as verified in Diodes' production test flow per DS32018 Rev. 7 Section 4.
ZLDO1117G25TA 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:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.35V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
ZLDO1117G25TA FAQ
1.How can I place an order for ZLDO1117G25TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLDO1117G25TA 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 ZLDO1117G25TA reliable?
The price and inventory of ZLDO1117G25TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117G25TA is usually 5 days.
3.What payment methods are accepted for ZLDO1117G25TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117G25TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLDO1117G25TA?
ZLDO1117G25TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLDO1117G25TA 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 ZLDO1117G25TA?
For technical support, including ZLDO1117G25TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117G25TA requirements.
6.How does Aetrix verify that ZLDO1117G25TA is sourced from the original manufacturer or authorized distributors?
All ZLDO1117G25TA 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 ZLDO1117G25TA meets industry standards.
7.What is the process for return or replacement of ZLDO1117G25TA?
All ZLDO1117G25TA units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117G25TA, 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 ZLDO1117G25TA part is unused and in its original packaging.
Return procedure for ZLDO1117G25TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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