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Diodes Incorporated AP7370-33SA-7
- Part No.:
- AP7370-33SA-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP7370-33SA-7.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:5,900
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Product details
Overview
AP7370-33SA-7 from Diodes Incorporated is a fixed-output 3.3V, 300mA ultra-low dropout (ULDO) linear regulator in SOT23 package, featuring 18V max input voltage, 500mV dropout at 100mA, ±1% output accuracy, reverse current protection, and 1.5µA quiescent current - deployed in portable instrumentation and battery-powered USB peripherals.
For engineers reviewing the AP7370-33SA-7 datasheet, AP7370-33SA-7 pinout, AP7370-33SA-7 application, or AP7370-33SA-7 equivalent, key selection criteria include dropout performance under 100mA load, thermal resistance in SOT23 (205°C/W), compatibility with low-ESR ceramic capacitors, and suitability for space-constrained 3.3V rail regulation in portable devices.
Technical Context
The AP7370-33SA-7 integrates a precision voltage reference, error amplifier, resistor network for fixed 3.3V output, current-limit circuit (350mA min), chip-enable logic, and thermal shutdown at +160°C with +20°C hysteresis. It operates across -40°C to +125°C junction temperature.
Its architecture supports stable regulation with 1.0µF ceramic input/output capacitors, achieves 0.05%/V line regulation and 0.5% load regulation, and blocks reverse current when VOUT > VIN - critical for multi-rail systems with shared power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1% - ensures reliable logic-level compliance for 3.3V microcontrollers and sensors |
| Max Input Voltage | 18V - enables direct regulation from unregulated 12V/15V rails or multi-cell battery stacks |
| Dropout Voltage | 500mV @ 100mA - sustains regulation down to VIN = 3.8V, extending battery runtime in 3.3V systems |
| Quiescent Current | 1.5µA @ no load - minimizes standby power loss in always-on portable instrumentation |
| Current Limit | 350mA min - provides robust short-circuit protection without external current-sense components |
| Thermal Shutdown | +160°C with +20°C hysteresis - prevents latch-up during transient overloads in enclosed enclosures |
| Reverse Current Protection | Integrated - eliminates need for external blocking diode in back-to-back LDO configurations |
Pinout & Package
SOT23-3 package: 2.9mm × 1.3mm × 1.0mm body, surface-mount, RoHS-compliant, with exposed pad not present (no EP terminal).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts up to 18V DC with internal overvoltage clamp |
| 2 | GND | Analog/digital ground reference; must be low-impedance path to minimize noise coupling |
| 3 | VOUT | Regulated 3.3V output; requires ≥1.0µF ceramic capacitor placed within 3mm of pin for stability |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range | 3.2V to 18V - supports single-supply operation across Li-ion, LiPo, and industrial 12V bus inputs |
| Ultra-Low IQ | 1.5µA - extends shelf life and operational time in battery-backed metering and weighing scales |
| Ceramic Cap Compatible | Stable with 1.0µF X5R/X7R MLCCs - reduces BOM count and PCB area vs. tantalum or electrolytic alternatives |
| Reverse Current Block | Active MOSFET gate control - prevents backfeed from VOUT to VIN during power sequencing or fault conditions |
| Thermal & Short-Circuit Protection | Auto-recovery shutdown at +160°C and current-limit foldback - enables safe operation in sealed enclosures |
Applications
| Portable Weighing Scales | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Compact handheld scale using 2xAA or CR2032 batteries powering 24-bit ADC and LCD driver. IC Role / Device Role: Primary 3.3V rail regulator supplying analog front-end and digital controller. Use Value: 1.5µA quiescent current preserves battery capacity during idle; 500mV dropout maintains regulation until battery drops to 3.8V. |
Use Scenario: Industrial environmental sensor node logging temperature/humidity every 10 seconds on coin cell or Li-SOCl₂ battery. IC Role / Device Role: Low-power 3.3V supply for MCU, RF transceiver, and precision sensor interface. Use Value: Reverse current protection prevents discharge through VOUT when main battery is disconnected; ±1% accuracy ensures consistent ADC reference. |
| USB-Powered Test Equipment | Handheld Medical Instruments |
|
Use Scenario: Portable oscilloscope probe adapter drawing power from USB 2.0 (5V) while generating clean 3.3V for FPGA configuration and signal conditioning. IC Role / Device Role: Post-regulator converting noisy USB 5V to low-noise 3.3V for sensitive analog circuits. Use Value: 0.05%/V line regulation rejects USB port ripple; low ESR cap compatibility avoids instability with small footprint ceramics. |
Use Scenario: FDA-class II handheld pulse oximeter powered by rechargeable Li-ion, requiring regulated 3.3V for optical sensor and Bluetooth LE radio. IC Role / Device Role: Safety-critical power rail regulator with thermal fault containment. Use Value: +160°C thermal shutdown prevents overheating in pocket-worn enclosure; RoHS3/Halogen-free construction meets medical material compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3.3V ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-3302E/TO | 250mA rating, 600mV dropout @ 250mA, 2.3µA IQ, TO-92 package | Larger footprint, lower current capability, no reverse current protection | Select only if TO-92 through-hole assembly is required and 300mA peak load is not needed |
| TPS7A0533PDBVR | 200mA, 170mV dropout @ 100mA, 25nA IQ, SOT23-5 with EN pin | Lower dropout and IQ but reduced current; requires enable control and external capacitor | Prefer for ultra-low-power <100mA applications where 170mV dropout enables deeper battery discharge |
Compared with MCP1700-3302E/TO and TPS7A0533PDBVR, the AP7370-33SA-7 delivers higher output current (300mA vs. 250mA/200mA), integrated reverse current blocking, and tighter output accuracy (±1% vs. ±2%), making it optimal for compact, high-reliability 3.3V portable systems demanding robust fault handling.
Availability
AP7370-33SA-7 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and USB-powered test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for AP7370-33SA-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-efficiency power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP7370 series belongs to Diodes' wide-input ULDO regulator product line, engineered specifically for space-constrained, battery-sensitive applications requiring high accuracy, ultra-low IQ, and robust protection features across extended input voltage ranges.
FAQ
What is the minimum input voltage required for regulation at 3.3V output?
The AP7370-33SA-7 requires VIN ≥ 3.2V for guaranteed regulation per datasheet operating conditions. At 100mA load, dropout is 500mV, so VIN must be ≥ 3.8V to maintain 3.3V output. Below 3.2V, the device enters undervoltage lockout and disables output.
Can AP7370-33SA-7 be used with 2.2µF ceramic output capacitors?
Yes - the AP7370-33SA-7 is explicitly characterized for stability with 1.0µF to 10µF ceramic capacitors. A 2.2µF X5R/X7R MLCC meets ESR and capacitance requirements and improves transient response versus the minimum 1.0µF value.
Does this part include an enable pin?
No - the AP7370-33SA-7 is a three-pin fixed-output regulator (VIN, GND, VOUT) with no enable or shutdown control. It operates continuously when VIN is within specification; external switching must be implemented via a series FET on VIN if ON/OFF control is required.
Is AP7370-33SA-7 suitable for automotive applications?
No - the AP7370-33SA-7 is specified for industrial temperature range (-40°C to +125°C) but lacks AEC-Q100 qualification, automotive-grade screening, or extended reliability testing. It is intended for commercial/industrial portable equipment, not under-hood automotive use.
AP7370-33SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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-23-3
AP7370-33SA-7 FAQ
1.How can I place an order for AP7370-33SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-33SA-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 AP7370-33SA-7 reliable?
The price and inventory of AP7370-33SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-33SA-7 is usually 5 days.
3.What payment methods are accepted for AP7370-33SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-33SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-33SA-7?
AP7370-33SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-33SA-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 AP7370-33SA-7?
For technical support, including AP7370-33SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-33SA-7 requirements.
6.How does Aetrix verify that AP7370-33SA-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-33SA-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 AP7370-33SA-7 meets industry standards.
7.What is the process for return or replacement of AP7370-33SA-7?
All AP7370-33SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-33SA-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 AP7370-33SA-7 part is unused and in its original packaging.
Return procedure for AP7370-33SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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