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Diodes Incorporated ZLDO1117QG12TA
- Part No.:
- ZLDO1117QG12TA
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ZLDO1117QG12TA.pdf
- Description:
- LDO BJT HICURR SOT223 T&R 1K
- Quantity:
- Payment:
- Shipping:
Inventory:557
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Product details
Overview
ZLDO1117QG12TA from Diodes Incorporated is an AEC-Q100 Grade 2 qualified, fixed-output 1.2 V low-dropout linear regulator delivering up to 1 A output current with ±2% output voltage tolerance across –40°C to +105°C ambient temperature. It features ≤1.2 V dropout at full load, supports MLCC output capacitors (≥4.7 µF), and is designed for automotive power rails requiring stable low-voltage supplies such as 3.3 V logic or 1.8 V I/O core regulation.
For engineers reviewing the ZLDO1117QG12TA datasheet, ZLDO1117QG12TA pinout, ZLDO1117QG12TA application, or ZLDO1117QG12TA equivalent, this part offers verified automotive-grade thermal shutdown, fast transient response, and compatibility with standard SOT223 PCB footprints - critical for under-hood ECUs, ADAS domain controllers, and infotainment power domains where input voltage can reach 18 V and load transients exceed 500 mA.
Technical Context
The ZLDO1117QG12TA implements a quasi-LDO architecture with internal 1.25 V reference and precision error amplifier, enabling tight regulation under line, load, and temperature variations. Its dropout voltage remains ≤1.2 V at 1 A output current, allowing operation with only 2.4 V input for reliable 1.2 V output delivery.
It integrates overcurrent limiting and thermal shutdown triggered at +150°C junction temperature, with guaranteed stability using 4.7 µF MLCCs (ESR ≤ 0.5 Ω). The device operates across VIN = 2.7 V to 18 V and supports ambient temperatures from –40°C to +105°C per AEC-Q100 Grade 2 requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.200 V ±2% (1.176–1.224 V) across –40°C to +105°C ambient, ensuring consistent logic-level supply for automotive microcontrollers. |
| Max Dropout Voltage | 1.2 V at 1 A load (ΔVOUT = 1% of VOUT), enabling use with 2.4 V minimum input in battery-sag conditions. |
| Output Current | 1 A continuous, with internal current limiting protecting against short-circuit faults without external components. |
| Quiescent Current | 4–10 mA at VIN < 18 V and IO = 0 mA, minimizing standby power loss in always-on vehicle modules. |
| Thermal Shutdown | Activates at TJ ≈ +150°C, latching off output until die cools - prevents permanent damage during sustained overload. |
| Ripple Rejection | 60–80 dB at 120 Hz (VIN = VOUT + 3 V, COUT = 25 µF tantalum), suppressing alternator ripple in 12 V system-derived rails. |
| Operating Ambient Range | –40°C to +105°C, qualified per AEC-Q100 Grade 2, supporting placement near engine compartments or under-dash electronics. |
Pinout & Package
Package: SOT223 (Green, lead-free, halogen- and antimony-free per Diodes Inc. definition; 5.6 mm × 3.5 mm body, 0.95 mm height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - ADJ/GND | Reference node / ground return | Ground connection for fixed-output variant; ties internally to GND - must be connected directly to system ground plane with minimal trace inductance. |
| 2 - VOUT | Regulated output | Delivers 1.2 V supply; requires ≥4.7 µF MLCC (X7R, ESR ≤ 0.5 Ω) placed within 3 mm of pin for loop stability and transient response. |
| 3 - VIN | Unregulated input | Accepts 2.7–18 V; must remain ≥1.3 V above VOUT to maintain regulation - decoupling capacitor (≥1 µF) required close to pin. |
| Tab - VOUT | Thermal & electrical pad | Exposed copper tab is electrically connected to VOUT and serves as primary heat path; must be soldered to ≥5.6 mm × 5.6 mm 2 oz copper pour for θJA = 107°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| MLCC-compatible stability | Guaranteed stable with ≥4.7 µF X7R ceramic capacitors (ESR ≤ 0.5 Ω), eliminating need for bulkier tantalum or electrolytic types. |
| Fast transient response | Sub-10 mV output deviation during 100 mA → 500 mA load steps (with 4.7 µF MLCC), critical for burst-mode MCU operation. |
| AEC-Q100 Grade 2 qualification | Validated for –40°C to +105°C ambient operation with PPAP support, IATF 16949 manufacturing, and automotive change control. |
| Low-noise regulation | 60–80 dB ripple rejection at 120 Hz enables clean 1.2 V supply from noisy 12 V battery/alternator sources. |
| Thermal protection with auto-recovery | Shuts down at ~150°C junction temperature and resumes regulation once die cools below hysteresis threshold - no latch-up. |
Applications
| Engine Control Unit (ECU) Power Rail | ADAS Camera Module Core Supply |
|---|---|
|
Use Scenario: Provides 1.2 V core voltage for 32-bit automotive MCUs (e.g., RH850, S32K) operating in engine bay environments with wide input voltage swings and high ambient temperatures. IC Role / Device Role / Timing Role: Primary LDO regulator supplying CPU core rail; maintains regulation during cold-crank (6.5 V) and load-dump (27 V) transients via upstream protection. Use Value: Enables uninterrupted MCU operation at full frequency under –40°C to +105°C ambient, with <10 mV load-step deviation preserving timing margins. |
Use Scenario: Powers image signal processor (ISP) core in rear-view or surround-view camera modules mounted near exhaust or brake systems. IC Role / Device Role / Timing Role: Low-noise, thermally robust 1.2 V source for ISP digital core; rejects high-frequency switching noise from nearby DC-DC converters. Use Value: Delivers <0.5% output variation over temperature, preventing ISP clock jitter and frame sync errors in real-time video streams. |
| Automotive Infotainment SoC I/O Supply | Body Control Module (BCM) Sensor Interface Rail |
|
Use Scenario: Supplies 1.2 V I/O voltage for application processors (e.g., i.MX8, TDA4VM) in head-unit designs requiring AEC-Q100 compliance and long-term supply continuity. IC Role / Device Role / Timing Role: Fixed-output LDO for high-speed parallel bus interfaces (e.g., DDR I/O, PCIe PHY); maintains voltage accuracy during burst data transfers. Use Value: ±2% tolerance ensures reliable level-shifting between 1.2 V SoC I/O and 3.3 V peripheral buses, reducing interface failure risk over 15-year vehicle life. |
Use Scenario: Generates 1.2 V bias for analog front-end (AFE) circuits interfacing with pressure, temperature, and position sensors in BCM subassemblies. IC Role / Device Role / Timing Role: Precision analog supply rail; low quiescent current (≤10 mA) minimizes standby power in always-on sensor monitoring modes. Use Value: 0.5%/W thermal regulation and <6 mV load regulation ensure sensor ADC reference stability, maintaining <0.1% measurement accuracy across temperature. |
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 |
|---|---|---|---|
| TLV73312PDBVR | Lower IQ (40 µA typical), but rated only to +125°C junction and not AEC-Q100 qualified; 0.5 A max output. | Not suitable for under-hood placement or PPAP-driven programs; limited to cabin-zone modules with lower thermal stress. | Select only for non-automotive or cabin-only applications where ultra-low standby current outweighs qualification needs. |
| NCP1117ST12T3G | Same pinout and 1.2 V output, but commercial-grade (–40°C to +125°C TJ), no AEC-Q100 qualification, higher dropout (1.3 V @ 1 A). | Lacks PPAP documentation and automotive change control; unsuitable for safety-critical or OEM-specified BOMs. | Use only in cost-sensitive aftermarket or non-OEM designs where automotive qualification is not mandated. |
Compared with TLV73312PDBVR and NCP1117ST12T3G, the ZLDO1117QG12TA uniquely combines AEC-Q100 Grade 2 qualification, 1 A output, ≤1.2 V dropout, and MLCC compatibility - making it the only option qualified for direct replacement in production automotive ECUs requiring validated thermal and reliability performance.
Availability
ZLDO1117QG12TA is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, infotainment SoC I/O supplies, and body control module sensor interfaces requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.
Supply support for ZLDO1117QG12TA 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 manufacturer specializing in discrete, analog, and mixed-signal devices, with ISO/TS 16949-certified automotive production facilities and broad AEC-Q100-qualified portfolio.
The ZLDO1117Q series belongs to Diodes' automotive-grade LDO regulator product line, engineered specifically for demanding vehicle subsystems requiring high reliability, extended temperature operation, and PPAP-ready documentation support.
FAQ
Is ZLDO1117QG12TA pin-compatible with standard LM1117-1.2 or NCP1117ST12T3G?
Yes - ZLDO1117QG12TA uses the SOT223 package with identical pin 1 (GND), pin 2 (VOUT), pin 3 (VIN) assignment and tab-to-VOUT connection. Footprint, solder mask, and thermal pad layout match industry-standard 1117 regulators, enabling drop-in replacement in existing designs without PCB revision.
What is the minimum input voltage required for regulation at full 1 A load?
The minimum input voltage is 2.4 V: VOUT (1.2 V) + dropout (1.2 V max at 1 A) = 2.4 V. Below this, the device enters dropout mode and output voltage drops linearly with input. Datasheet specifies VIN ≥ 2.7 V for guaranteed regulation across all conditions including line/load/temperature variation.
Can ZLDO1117QG12TA be used with 2.2 µF MLCC output capacitors?
No - the device requires ≥4.7 µF MLCC (X7R, ESR ≤ 0.5 Ω) for guaranteed stability. Using 2.2 µF violates the minimum capacitance specification and risks oscillation or poor transient response. Diodes Inc. validates stability only with 4.7 µF or larger ceramic, tantalum, or aluminum electrolytic capacitors meeting ESR limits.
Does ZLDO1117QG12TA support reverse-polarity input protection?
No - the device lacks integrated reverse-voltage protection. If input polarity reversal is possible (e.g., battery jump-start scenarios), an external series Schottky diode (e.g., MBRM120) must be added between VIN and the power source to prevent catastrophic failure. This adds ~0.3 V forward drop and requires thermal derating.
ZLDO1117QG12TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.35V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 5 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
ZLDO1117QG12TA FAQ
1.How can I place an order for ZLDO1117QG12TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLDO1117QG12TA 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 ZLDO1117QG12TA reliable?
The price and inventory of ZLDO1117QG12TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117QG12TA is usually 5 days.
3.What payment methods are accepted for ZLDO1117QG12TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117QG12TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLDO1117QG12TA?
ZLDO1117QG12TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLDO1117QG12TA 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 ZLDO1117QG12TA?
For technical support, including ZLDO1117QG12TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117QG12TA requirements.
6.How does Aetrix verify that ZLDO1117QG12TA is sourced from the original manufacturer or authorized distributors?
All ZLDO1117QG12TA 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 ZLDO1117QG12TA meets industry standards.
7.What is the process for return or replacement of ZLDO1117QG12TA?
All ZLDO1117QG12TA units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117QG12TA, 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 ZLDO1117QG12TA part is unused and in its original packaging.
Return procedure for ZLDO1117QG12TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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