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Diodes Incorporated AP7370-33WW-7
- Part No.:
- AP7370-33WW-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7370-33WW-7.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:10,370
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Product details
Overview
AP7370-33WW-7 from Diodes Incorporated is a 3.3V fixed-output, 300mA ultra-low dropout (ULDO) linear regulator in SOT25 package, featuring 18V max input voltage, 500mV dropout at 100mA, ±1% output accuracy, and reverse current protection-designed for stable power delivery in portable instrumentation and battery-powered USB devices.
For engineers reviewing the AP7370-33WW-7 datasheet, AP7370-33WW-7 pinout, AP7370-33WW-7 application, or AP7370-33WW-7 equivalent, key selection criteria include wide VIN range (3.2–18V), thermal shutdown at +160°C, sub-2.5µA quiescent current at zero load, and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The AP7370-33WW-7 integrates a precision voltage reference, error amplifier, resistor network for fixed 3.3V output, current-limit circuit (350mA typical), chip-enable logic, and reverse-current blocking-enabling operation down to 3.2V input while maintaining regulation up to 18V. Its architecture eliminates body diode conduction during shutdown.
Thermal shutdown activates at +160°C with +20°C hysteresis, and line/load regulation are specified at ≤0.05%/V and ≤0.5%, respectively. The device operates across –40°C to +125°C junction temperature and supports stable output with 1.0µF input/output ceramic capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1% (ensures stable MCU core supply under varying load/temperature) |
| Max Input Voltage | 18V (supports 12V rail, automotive transients, and multi-cell battery inputs) |
| Dropout Voltage | 500mV @ 100mA (enables 3.3V output from 3.8V Li-ion single-cell or 5V USB with margin) |
| Quiescent Current | 1.5–2.5µA @ 0mA (extends battery life in always-on sensor nodes) |
| Current Limit | 350mA min (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 PCB heatsinking) |
| Output Accuracy vs Temp | ±100ppm/°C (maintains <±1.5% total drift over –40°C to +125°C) |
Pinout & Package
SOT25 (WW) package: 5-pin surface-mount, thermally enhanced plastic case with exposed pad (EP = GND), footprint compatible with JEDEC MO-203AA. Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT, Pins 4–5 = NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.2–18V; requires local 1µF ceramic decoupling |
| 2 | GND | Analog/digital ground reference; connects to EP for thermal dissipation |
| 3 | VOUT | Regulated 3.3V output; stable with ≥1µF ceramic capacitor; reverse-current blocked |
| 4, 5 | NC | No internal connection; must be left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (3.2–18V) | Enables single-regulator support across USB, 9V battery, 12V industrial, and automotive 12V/24V systems |
| Reverse current protection | Prevents backfeed from VOUT to VIN during shutdown-critical for multi-rail sequencing and hot-swap safety |
| Ultra-low IQ (1.5µA) | Reduces standby power loss by >90% vs. standard LDOs, enabling >1-year battery life in low-duty-cycle IoT sensors |
| Low-ESR capacitor compatible | Stable with 1µF X5R/X7R ceramics-eliminates need for costly tantalum or aluminum electrolytics |
| Thermal shutdown + hysteresis | Auto-recovery after cooling avoids system lockup during transient overloads or ambient temperature spikes |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
Use Scenario: Handheld blood glucose meter powered by CR2032 coin cell with intermittent 3.3V MCU and analog front-end operation. IC Role / Device Role / Timing Role: Primary 3.3V power source regulating from 2.5–3.3V battery range; provides clean, low-noise supply for ADC reference and microcontroller core. Use Value: 1.5µA quiescent current extends battery life beyond 2 years; ±1% accuracy ensures consistent ADC full-scale calibration across temperature. |
Use Scenario: Portable digital multimeter drawing power from USB-C host while measuring high-impedance circuits. IC Role / Device Role / Timing Role: Post-regulator converting noisy 5V USB to stable 3.3V for MCU, display driver, and precision op-amps. Use Value: 500mV dropout allows full 3.3V output even as USB voltage sags to 4.5V; reverse-current blocking prevents meter from back-powering host during disconnect. |
| Industrial Weighing Scales | Smart Meter Data Loggers |
Use Scenario: Battery-backed platform using 3.7V Li-ion with 10-year field deployment requirement and periodic wireless transmission. IC Role / Device Role / Timing Role: Main system regulator delivering 300mA peak to RF module and microcontroller during BLE transmission bursts. Use Value: 350mA current limit protects against shorted sensor lines; thermal hysteresis prevents cycling during enclosure heating in direct sunlight. |
Use Scenario: AMI smart meter with dual-supply design: mains-powered primary and backup supercapacitor bank. IC Role / Device Role / Timing Role: Backup regulator sourcing 3.3V from supercap during AC failure; maintains RTC, memory, and communication state. Use Value: 18V input rating accommodates supercap charging voltage up to 16V; NC pins simplify layout in space-constrained meter PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7375-33W5-7 | Successor part with same pinout; improved PSRR (65dB @ 1kHz), lower dropout (400mV @ 100mA), and extended temp range (–40°C to +150°C) | Recommended for new designs requiring higher noise immunity or extended thermal margin | Select AP7375-33W5-7 if designing for automotive under-hood or industrial high-temp environments |
| MCP1700T-3302E/MB | Microchip 250mA LDO; 6V max input; 1.6µA IQ; no reverse-current protection; SOT23-3 package | Limited to low-voltage, low-current applications where input never exceeds 6V | Use only when input is strictly ≤6V and reverse-current blocking is not required |
Compared with AP7370-33WW-7, AP7375-33W5-7 offers superior PSRR and thermal robustness but shares identical footprint and control logic; MCP1700T-3302E/MB trades input voltage range and protection features for lower cost and smaller size in low-power, low-VIN applications.
Availability
AP7370-33WW-7 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered test equipment, and industrial weighing systems requiring stable component supply with long-term lifecycle visibility.
Supply support for AP7370-33WW-7 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 ICs, with emphasis on power management, signal integrity, and connectivity solutions.
The AP7370 series belongs to Diodes' high-voltage ULDO regulator product line, engineered for reliable power delivery in space-constrained, battery-sensitive applications where wide input range and ultra-low quiescent current are critical.
FAQ
Is AP7370-33WW-7 recommended for new designs?
No-Diodes Incorporated explicitly marks AP7370-33WW-7 as "NOT RECOMMENDED FOR NEW DESIGN" in its official datasheet (DS41820 Rev. 2-3, April 2024). The AP7375-33W5-7 is the designated successor with enhanced specifications and full pin compatibility. Existing designs may continue using AP7370-33WW-7 under current supply channels, but new projects should adopt the AP7375 series.
What is the function of pins 4 and 5 on the SOT25 (WW) package?
Pins 4 and 5 are No Connect (NC) terminals-internally unconnected for the fixed-output AP7370-33WW-7 variant. They must remain unconnected or be tied to GND per PCB layout best practices to minimize parasitic coupling. These pins are reserved for future adjustable versions and carry no electrical function in this part number.
Can AP7370-33WW-7 operate with input voltage below 3.3V?
No-per Recommended Operating Conditions, minimum input voltage is 3.2V. With a 3.3V output, the device requires at least 3.2V input to maintain regulation; operation below this threshold results in dropout and unregulated output. For sub-3.2V inputs, a buck-boost or charge-pump solution is required.
Does AP7370-33WW-7 require an external bypass capacitor on the input pin?
Yes-datasheet specifies a minimum 1.0µF ceramic capacitor (X5R/X7R) at VIN, placed as close as possible to pins 1 and 2. This capacitor suppresses high-frequency noise from upstream sources and stabilizes input impedance during load transients; omitting it risks instability or excessive output ripple under dynamic loads.
AP7370-33WW-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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-25
AP7370-33WW-7 FAQ
1.How can I place an order for AP7370-33WW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-33WW-7 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 AP7370-33WW-7 reliable?
The price and inventory of AP7370-33WW-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-33WW-7 is usually 5 days.
3.What payment methods are accepted for AP7370-33WW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-33WW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-33WW-7?
AP7370-33WW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-33WW-7 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 AP7370-33WW-7?
For technical support, including AP7370-33WW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-33WW-7 requirements.
6.How does Aetrix verify that AP7370-33WW-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-33WW-7 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 AP7370-33WW-7 meets industry standards.
7.What is the process for return or replacement of AP7370-33WW-7?
All AP7370-33WW-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-33WW-7, 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 AP7370-33WW-7 part is unused and in its original packaging.
Return procedure for AP7370-33WW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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