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Diodes Incorporated AP7370-33Y-13
- Part No.:
- AP7370-33Y-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP7370-33Y-13.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:20,366
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Product details
Overview
AP7370-33Y-13 from Diodes Incorporated is a fixed-output 3.3V, 300mA ultra-low dropout (ULDO) linear regulator in SOT89 package, featuring 500mV dropout at 100mA, ±1% output voltage accuracy over load/temperature, and reverse current protection-designed for stable power delivery in portable instrumentation and battery-powered metering systems.
For engineers reviewing the AP7370-33Y-13 datasheet, AP7370-33Y-13 pinout, AP7370-33Y-13 application, or AP7370-33Y-13 equivalent, key selection criteria include input voltage range (3.2–18V), thermal shutdown threshold (+160°C), low quiescent current (1.5–2.5µA), and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The AP7370-33Y-13 integrates a precision voltage reference, error amplifier, and current-limit circuit to maintain regulation across wide input (3.2–18V) and junction temperature (−40°C to +125°C) ranges. Its internal architecture enables stable operation with 1µF input/output ceramic capacitors and provides reverse current blocking when VOUT > VIN.
Thermal shutdown activates at +160°C with +20°C hysteresis, and current limiting is set to 350mA (typical) for VOUT = 3.3V. The device operates without external feedback components due to factory-trimmed resistor network for fixed 3.3V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1% (ensures stable MCU core logic supply under varying load/temperature) |
| Max Input Voltage | 18V (supports direct connection to unregulated 12V rails or automotive transients) |
| Dropout Voltage | 500mV @ 100mA (enables regulation down to VIN = 3.8V for 3.3V output) |
| Quiescent Current | 1.5–2.5µA (minimizes battery drain in always-on metering applications) |
| Current Limit | 350mA (protects against short-circuit while sustaining 300mA continuous load) |
| Thermal Shutdown | +160°C with +20°C hysteresis (prevents latch-up during sustained overload or poor heatsinking) |
| Line Regulation | 0.05%/V (maintains tight output stability across full 3.2–18V input range) |
Pinout & Package
SOT89 package: 3-pin thermally enhanced plastic surface-mount package with exposed tab connected to GND for improved heat dissipation (θJA = 126°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply pin; accepts 3.2–18V; requires local 1µF ceramic decoupling |
| 2 | GND | Power ground reference; electrically tied to exposed tab for thermal conduction |
| 3 | VOUT | Regulated 3.3V output; stable with ≥1µF low-ESR ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range | 3.2V to 18V enables single-regulator support for multi-battery or industrial DC rails |
| Reverse current protection | Blocks current flow from VOUT to VIN during input brownout or hot-swap events |
| Low ground current | 1.5µA no-load current extends battery life in sleep-mode portable instruments |
| Thermal shutdown + hysteresis | +160°C trip with +20°C recovery prevents oscillation during thermal overload |
| Ceramic capacitor compatible | No ESR requirement eliminates need for tantalum or aluminum electrolytic output caps |
Applications
| Metering Systems | Weighing Scales |
|---|---|
Use Scenario: Portable digital multimeters and energy meters powered by 2–4 alkaline cells or Li-ion packs. IC Role / Device Role / Timing Role: Primary 3.3V supply for ADC, microcontroller, and display driver. Use Value: Ultra-low quiescent current preserves battery runtime; ±1% accuracy ensures calibrated measurement integrity. |
Use Scenario: Battery-operated platform scales with high-resolution strain-gauge interface. IC Role / Device Role / Timing Role: Clean analog supply rail for precision 24-bit sigma-delta ADC and reference buffer. Use Value: Low noise and excellent load regulation prevent offset drift during dynamic weight transitions. |
| Laptop Peripherals | Industrial Handheld Terminals |
Use Scenario: USB-powered docking accessories requiring regulated 3.3V from variable upstream sources. IC Role / Device Role / Timing Role: Post-regulator for USB PD sink-side logic and interface ICs. Use Value: Wide 3.2–18V input accommodates USB-C PD negotiation voltages (5V/9V/15V) without external buck stage. |
Use Scenario: Ruggedized barcode scanners and data collectors operating in warehouses with fluctuating 12V vehicle power. IC Role / Device Role / Timing Role: Point-of-load regulator for ARM Cortex-M host processor and RF module. Use Value: Thermal shutdown and reverse current protection ensure reliability during engine cranking or load dump events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7375-33Y-13 | Successor part with same pinout; lower dropout (400mV @ 100mA), improved PSRR (65dB @ 1kHz) | Preferred for noise-sensitive analog circuits; supports tighter input margins | Select when upgrading new designs-Diodes explicitly recommends AP7375 over AP7370 |
| MCP1703T-3302E/MB | Microchip 3.3V LDO; 600mV dropout @ 250mA, higher IQ (2.5µA), no reverse current protection | Lacks reverse blocking; requires external diode for backfeed prevention | Acceptable where cost sensitivity outweighs reverse protection need and thermal margin permits |
Compared with AP7370-33Y-13, AP7375-33Y-13 delivers lower dropout and better noise rejection for next-gen designs, while MCP1703T-3302E/MB offers legacy compatibility but requires external protection and sacrifices thermal headroom at full load.
Availability
AP7370-33Y-13 is available at Aetrix Electronics and suitable for metering systems, weighing scales, portable instrumentation, and industrial handheld terminals requiring stable component supply with long-term traceability.
Supply support for AP7370-33Y-13 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 power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP7370 series belongs to Diodes' high-voltage ULDO regulator product line, engineered specifically for battery-powered and wide-input industrial applications demanding low IQ, reverse current blocking, and robust thermal protection.
FAQ
What is the recommended input and output capacitance for AP7370-33Y-13?
The AP7370-33Y-13 is optimized for 1.0µF ceramic capacitors on both input and output pins. These must be X5R/X7R dielectrics with low ESR (<100mΩ); no series resistance or additional bulk capacitance is required for stability. Larger values improve transient response but do not affect loop compensation.
Does AP7370-33Y-13 require an external enable signal?
No-the AP7370-33Y-13 has no enable pin and operates continuously when VIN is within specification (3.2–18V). It lacks active shutdown control; power sequencing is managed solely via VIN ramp. For controlled start-up, external MOSFET switching on VIN is required.
Can AP7370-33Y-13 be used with input voltages below 3.2V?
No-3.2V is the absolute minimum input voltage per datasheet specifications. Below this, regulation fails and VOUT drops below 3.3V even at zero load. For sub-3.2V inputs, consider the AP7361 series (2.2V min VIN) or AP7363 (1.7V min VIN), which share similar features but different voltage ranges.
Is the SOT89 package's exposed tab electrically connected?
Yes-the exposed thermal pad on the SOT89 package is internally connected to GND and must be soldered to a PCB copper pour for optimal thermal performance (θJA = 126°C/W). Floating or insulated mounting degrades thermal resistance by >40% and risks thermal shutdown under 200mA+ loads.
AP7370-33Y-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 100mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 2.5 µA
- Current - Supply (Max):
- 300 µA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Reverse Current, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AP7370-33Y-13 FAQ
1.How can I place an order for AP7370-33Y-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-33Y-13 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 AP7370-33Y-13 reliable?
The price and inventory of AP7370-33Y-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-33Y-13 is usually 5 days.
3.What payment methods are accepted for AP7370-33Y-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-33Y-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-33Y-13?
AP7370-33Y-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-33Y-13 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 AP7370-33Y-13?
For technical support, including AP7370-33Y-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-33Y-13 requirements.
6.How does Aetrix verify that AP7370-33Y-13 is sourced from the original manufacturer or authorized distributors?
All AP7370-33Y-13 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 AP7370-33Y-13 meets industry standards.
7.What is the process for return or replacement of AP7370-33Y-13?
All AP7370-33Y-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-33Y-13, 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 AP7370-33Y-13 part is unused and in its original packaging.
Return procedure for AP7370-33Y-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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