My Inquiry
My Account
Diodes Incorporated AP7370-33FDC-7
- Part No.:
- AP7370-33FDC-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 6-UDFN Exposed Pad
- Datasheet:
-
AP7370-33FDC-7.pdf
- Description:
- IC REG LINEAR 3.3V 300MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,509
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AP7370-33FDC-7 from Diodes Incorporated is a 3.3V fixed-output, 300mA ultra-low dropout (ULDO) linear regulator in U-DFN2020-6 (Type C) package. It operates across 3.2V–18V input range, delivers ±1% output voltage accuracy at 300mA load, and features 500mV dropout at 100mA with only 1.5µA quiescent current - enabling long battery life in portable instrumentation and USB-powered devices.
For engineers reviewing the AP7370-33FDC-7 datasheet, AP7370-33FDC-7 pinout, AP7370-33FDC-7 application, or AP7370-33FDC-7 equivalent, key selection criteria include wide VIN tolerance, reverse current protection, thermal shutdown behavior, and compatibility with low-ESR ceramic capacitors in space-constrained layouts.
Technical Context
The AP7370-33FDC-7 integrates a precision voltage reference, error amplifier, resistor network for fixed 3.3V output, current-limit circuitry (350mA typical), and chip-enable logic. Its architecture supports stable regulation under fast load transients while maintaining ultra-low ground current across temperature.
It implements reverse current protection to prevent backfeed from VOUT to VIN, thermal shutdown at +160°C with +20°C hysteresis, and line/load regulation of ≤0.05%/V and ≤0.5%, respectively - critical for precision analog and mixed-signal subsystems powered from variable sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1% (ensures stable MCU core or sensor rail within tight tolerance) |
| Max Input Voltage | 18V (supports unregulated 12V bus or multi-cell battery inputs) |
| Dropout Voltage | 500mV @ 100mA (enables regulation down to VIN = 3.8V for 3.3V output) |
| Quiescent Current | 1.5µA @ no load (minimizes standby power in battery-gated systems) |
| Current Limit | 350mA typical (protects IC and source during short-circuit or overload) |
| Thermal Shutdown | +160°C with +20°C hysteresis (prevents latch-up and enables safe recovery) |
| Reverse Current Protection | Integrated (blocks VOUT-to-VIN backflow without external diode) |
Pinout & Package
U-DFN2020-6 (Type C) package: 2.0mm × 2.0mm × 0.6mm body, exposed pad (EP) for thermal enhancement, RoHS-compliant, halogen- and antimony-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.2V–18V with internal overvoltage protection |
| 2 | GND | Analog ground reference; tied to EP for optimal thermal and noise performance |
| 3 | VOUT | Regulated 3.3V output; requires ≥1.0µF low-ESR ceramic capacitor per datasheet |
| 4 | NC | No-connect terminal; electrically isolated and must remain floating |
| 5 | NC | No-connect terminal; electrically isolated and must remain floating |
| 6 | NC | No-connect terminal; electrically isolated and must remain floating |
| EP | GND | Exposed thermal pad; must be soldered to PCB ground plane for θJA = 54°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range | 3.2V–18V operation eliminates need for pre-regulation in industrial or automotive accessory rails |
| Ultra-low IQ | 1.5µA ground current at zero load extends shelf life and runtime in always-on sensors |
| Low-ESR capacitor support | Stable with 1.0µF ceramic output cap - reduces BOM count and board area vs. tantalum alternatives |
| Reverse current blocking | Prevents VOUT from sourcing current into VIN during power sequencing or fault conditions |
| Thermal & short-circuit protection | Auto-recovery shutdown prevents damage during sustained overload or poor heatsinking |
Applications
| Battery-Powered Instrumentation | USB-Powered Portable Devices |
|---|---|
Use Scenario: Handheld multimeter or portable DMM requiring stable 3.3V rail from 3×AA or Li-ion battery pack with varying voltage (2.4V–12.6V). IC Role / Device Role / Timing Role: Primary LDO supplying ADC reference, microcontroller core, and display driver from unregulated battery source. Use Value: 500mV dropout allows full regulation until battery reaches ~3.8V; ±1% accuracy ensures measurement repeatability across temperature. |
Use Scenario: USB-C powered smart scale or BLE-enabled health monitor drawing power from 5V USB bus with possible voltage sag. IC Role / Device Role / Timing Role: Post-regulator delivering clean 3.3V to RF SoC and load cell amplifier, rejecting USB noise and ripple. Use Value: 0.05%/V line regulation maintains output stability despite USB port voltage variation; reverse current protection avoids backfeed during USB disconnect. |
| Industrial Metering Modules | Portable Information Appliances |
Use Scenario: DIN-rail mounted energy meter with auxiliary 3.3V rail derived from 12V or 24V field supply subject to transients and brownouts. IC Role / Device Role / Timing Role: Secondary regulator powering real-time clock, communication interface (RS-485/UART), and isolation barrier controller. Use Value: 18V max VIN withstands load-dump spikes; thermal shutdown protects during enclosure overheating or airflow loss. |
Use Scenario: E-reader or handheld POS terminal using single-cell Li-ion (2.7V–4.2V) with requirement for regulated 3.3V during deep discharge. IC Role / Device Role / Timing Role: Main system regulator feeding application processor I/O, touchscreen controller, and flash memory. Use Value: 3.2V min VIN enables operation down to near-end-of-discharge; 1.5µA IQ preserves battery charge during sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7375-33FDC-7 | Successor part with same pinout; improved dropout (400mV @ 100mA), lower IQ (0.9µA), and extended temp range (−40°C to +150°C) | Recommended for new designs requiring higher efficiency or extended junction temperature margin | Select AP7375-33FDC-7 where lifecycle assurance and enhanced specs justify redesign effort |
| MCP1703T-3302E/MB | 300mA, 3.3V LDO in SOT-23; 600mV dropout @ 250mA, 2.5µA IQ, no reverse current protection | Suitable for cost-sensitive, non-battery-critical applications where footprint is less constrained | Choose only if U-DFN2020-6 is not required and reverse current blocking is unnecessary |
Compared with AP7370-33FDC-7, AP7375-33FDC-7 offers measurable improvements in dropout, quiescent current, and thermal rating - making it the preferred choice for future designs - while MCP1703T-3302E/MB trades protection features and package size for legacy compatibility and lower unit cost.
Availability
AP7370-33FDC-7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, USB-powered portable devices, and industrial metering modules requiring stable component supply with guaranteed traceability and long-term continuity.
Supply support for AP7370-33FDC-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 ICs, specializing in high-performance, high-reliability power management, signal integrity, and protection solutions.
The AP7370 series belongs to Diodes' ultra-low dropout linear regulator product line, engineered specifically for space-constrained, battery-sensitive applications demanding wide input range and minimal quiescent power.
FAQ
Is AP7370-33FDC-7 recommended for new designs?
No - Diodes Incorporated explicitly marks AP7370-33FDC-7 as "NOT RECOMMENDED FOR NEW DESIGN" in its official datasheet (DS41820 Rev. 2-3). The AP7375-33FDC-7 is the designated successor with improved electrical specs and extended temperature capability, and should be used for all new designs requiring this functionality.
What is the thermal performance of AP7370-33FDC-7 in U-DFN2020-6 package?
In U-DFN2020-6 (Type C) package with properly designed PCB thermal pad (EP soldered to ≥1 cm² copper), AP7370-33FDC-7 achieves θJA = 54°C/W and θJC = 9.5°C/W. At 300mA output and 12V input, junction temperature rise is ~16°C above ambient - well within the +125°C max operating limit when ambient stays below +109°C.
Does AP7370-33FDC-7 require an input capacitor?
Yes - although not explicitly specified in minimum value, Diodes recommends a 1.0µF ceramic capacitor at VIN (X5R/X7R, 6.3V rating) to suppress high-frequency noise and stabilize input impedance, especially when sourced from long traces or switching converters. This improves transient response and prevents oscillation under dynamic loads.
Can AP7370-33FDC-7 be used with tantalum or electrolytic output capacitors?
No - the AP7370 is optimized for low-ESR ceramic capacitors (≥1.0µF, X5R/X7R). Tantalum or aluminum electrolytic capacitors exhibit higher ESR and capacitance drift, which can cause instability, overshoot, or failure to meet load regulation specs. Ceramic-only output configuration is mandatory per datasheet design guidelines.
AP7370-33FDC-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 6-UDFN Exposed Pad
- 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:
- U-DFN2020-6 (Type C)
AP7370-33FDC-7 FAQ
1.How can I place an order for AP7370-33FDC-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-33FDC-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 AP7370-33FDC-7 reliable?
The price and inventory of AP7370-33FDC-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-33FDC-7 is usually 5 days.
3.What payment methods are accepted for AP7370-33FDC-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-33FDC-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-33FDC-7?
AP7370-33FDC-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-33FDC-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 AP7370-33FDC-7?
For technical support, including AP7370-33FDC-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-33FDC-7 requirements.
6.How does Aetrix verify that AP7370-33FDC-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-33FDC-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 AP7370-33FDC-7 meets industry standards.
7.What is the process for return or replacement of AP7370-33FDC-7?
All AP7370-33FDC-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-33FDC-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 AP7370-33FDC-7 part is unused and in its original packaging.
Return procedure for AP7370-33FDC-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AP7370-33FDC-7 Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
