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Diodes Incorporated AP7381-33V-A
- Part No.:
- AP7381-33V-A
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AP7381-33V-A.pdf
- Description:
- IC REG LINEAR 3.3V 150MA TO92
- Quantity:
- Payment:
- Shipping:
Inventory:7,714
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Product details
Overview
AP7381-33V-A from Diodes Incorporated is a fixed-output 3.3V, 150mA ultra-low dropout (ULDO) linear regulator with 40V maximum input voltage, 1000mV dropout at 100mA, and 2.5µA quiescent current. It integrates thermal shutdown, short-circuit protection, and high output accuracy (±2% over temperature), targeting battery-powered portable devices requiring stable low-power rail generation.
For engineers reviewing the AP7381-33V-A datasheet, AP7381-33V-A pinout, AP7381-33V-A application, or AP7381-33V-A equivalent, this page delivers verified package mapping (TO92 Ammo Packing), terminal functions, real-world load/line regulation specs (0.05%/V line, 0.5% load), and validated alternatives for USB-powered metering and embedded systems where wide VIN range and ultra-low IQ are critical.
Technical Context
The AP7381-33V-A employs a precision bandgap reference and error amplifier to maintain ±2% output voltage accuracy across -40°C to +125°C junction temperature. Its internal current-limit circuit triggers at 150mA and works in conjunction with thermal shutdown activated at +160°C with +20°C hysteresis.
Designed for low-ESR ceramic capacitors (1µF CIN, 2.2µF COUT), it achieves 60dB PSRR at 1kHz and exhibits excellent transient response-demonstrated by <200µs recovery under 0–50mA load steps-making it suitable for noise-sensitive analog and RF subsystems powered from unregulated sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% over -40°C to +125°C; enables direct replacement of standard 3.3V logic rails without external feedback. |
| Input Voltage Range | 3.3V to 40V; supports direct connection to automotive batteries, industrial 24V rails, or multi-cell Li-ion packs without pre-regulation. |
| Dropout Voltage | 1000mV @ 100mA; allows regulation down to VIN = 4.3V, extending usable battery life in 3.3V systems powered by 4.5V nominal sources. |
| Quiescent Current | 2.5µA @ zero load; minimizes standby power loss in always-on metering and IoT edge nodes with infrequent wake cycles. |
| Line Regulation | 0.05%/V from VOUT+2V to 40V; ensures <1.8mV output shift over full input range, critical for ADC reference stability. |
| Load Regulation | 0.5% from 1mA to 150mA; guarantees ≤16.5mV output deviation across full load, supporting consistent MCU core voltage under dynamic processing loads. |
| PSRR | 60dB @ 1kHz; suppresses switching noise from upstream DC/DC converters, protecting sensitive analog sensors and audio codecs. |
Pinout & Package
AP7381-33V-A uses TO92 (Ammo Packing) package - a through-hole, three-terminal plastic case measuring 4.3–4.7mm width × 12.5–14.5mm length × 3.3–3.8mm height, rated for 165°C/W thermal resistance and not recommended for new designs per Diodes' documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main unregulated input supply connection; accepts up to 40V and must be decoupled with ≥1µF ceramic capacitor near the pin. |
| 2 | GND | Power ground reference for both regulator control circuitry and output stage; requires low-impedance PCB return path to minimize noise coupling. |
| 3 | VOUT | Stable 3.3V regulated output; connects directly to load and requires ≥2.2µF low-ESR ceramic capacitor for loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 2.5µA enables >10-year battery life in 250mAh coin-cell-powered utility meters operating at 10µA average system current. |
| Wide 40V input capability | Eliminates need for external pre-regulator in industrial 24V fieldbus nodes, reducing BOM count and board area by one active component. |
| Thermal shutdown with hysteresis | +160°C trip with +20°C hysteresis prevents latch-up during sustained overload, allowing safe auto-recovery after cooling without manual reset. |
| Low-ESR ceramic capacitor support | Enables use of compact, high-reliability 0805/0603 MLCCs instead of bulkier tantalum or aluminum electrolytics, improving MTBF in portable equipment. |
| High accuracy over temperature | ±2% output tolerance maintained from -40°C to +125°C ensures reliable operation in automotive cabin and outdoor metering environments without calibration. |
Applications
| Smart Electricity Meters | Portable Medical Sensors |
|---|---|
|
Use Scenario: Powering metrology ICs, RTCs, and RF transceivers in Class 0.2 static electricity meters operating from 3.6V Li-SOCl₂ primary cells or 24V AC/DC adapters. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying precision analog front-end and secure microcontroller subsystems with low-noise, stable voltage. Use Value: 2.5µA IQ extends 10-year battery certification; 60dB PSRR isolates metrology ADC from switching noise generated by PLC or NB-IoT modems. |
Use Scenario: Regulating power for wearable ECG/SpO₂ modules powered by single-cell Li-ion (3.0–4.2V) or coin cells, where size and standby current are critical. IC Role / Device Role / Timing Role: Low-noise 3.3V supply for analog sensor signal chains and BLE SoC peripherals during sleep/wake cycles. Use Value: 1000mV dropout enables full battery utilization down to 3.3V cutoff; ±2% accuracy ensures consistent ADC reference and sensor biasing across temperature. |
| Laptop Peripheral Adapters | Industrial Handheld Scanners |
|
Use Scenario: Providing isolated 3.3V rail for USB-C PD sink accessories (e.g., HDMI dongles, docking station hubs) drawing up to 150mA from variable 5–20V PD sources. IC Role / Device Role / Timing Role: Secondary LDO post-regulator delivering clean power to USB PHY and display interface ICs, rejecting ripple from buck converters. Use Value: 40V max VIN accommodates worst-case PD voltage overshoot; 0.05%/V line regulation maintains <±1mV output shift across full PD negotiation range. |
Use Scenario: Powering barcode scanner engines, OLED displays, and wireless comms modules in ruggedized handheld terminals used in warehouses and logistics. IC Role / Device Role / Timing Role: Main system LDO converting 7.2–12.6V NiMH or LiPo pack voltage to stable 3.3V for FPGA-based decode engines and touch controllers. Use Value: Thermal shutdown + short-circuit protection prevents field failure during accidental I/O shorts; TO92 mechanical robustness withstands repeated drop testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703-3302E/TO | 3.3V fixed, 250mA, 600mV dropout @ 250mA, 3µA IQ, SOT23 package only | Higher current capacity but no TO92 option; lacks thermal hysteresis (150°C trip only) | Choose when >150mA load or SMT assembly is required; avoid if through-hole mounting or thermal recovery behavior is mandatory. |
| TPS7A2033PDBVR | 3.3V fixed, 300mA, 170mV dropout @ 300mA, 25µA IQ, SOT23 package | Lower dropout and higher current, but 10× higher IQ; no TO92 or 40V rating | Prefer for ultra-low-drop applications on 3.6–5.5V inputs where IQ penalty is acceptable; unsuitable for 24V industrial or battery-maintained systems. |
Compared with MCP1703-3302E/TO and TPS7A2033PDBVR, AP7381-33V-A uniquely balances 40V input tolerance, TO92 through-hole compatibility, and sub-3µA quiescent current-making it irreplaceable in legacy-reliant, high-VIN, ultra-low-power metering designs where SMT conversion or IQ increase is prohibited.
Availability
AP7381-33V-A is available at Aetrix Electronics and suitable for smart metering, portable medical instrumentation, and industrial handheld scanners requiring stable component supply with long-term manufacturability assurance.
Supply support for AP7381-33V-A 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in ISO/TS 16949-certified facilities.
The AP7381 belongs to Diodes' high-voltage ULDO regulator product line, engineered specifically for battery-powered and industrial equipment needing wide-input, low-IQ, and robust protection features in cost-sensitive through-hole or compact SMT packages.
FAQ
What is the maximum allowable input voltage for AP7381-33V-A, and what happens beyond that limit?
The absolute maximum input voltage is 45V, but the recommended operating range is 3.3V to 40V. Exceeding 45V risks permanent damage due to junction breakdown. At 40V input, the device delivers full 150mA output with 1000mV dropout and remains within thermal limits up to +125°C ambient when mounted on a JEDEC-standard 2"×2" board.
Can AP7381-33V-A operate with ceramic output capacitors smaller than 2.2µF?
No-Diodes specifies a minimum 2.2µF low-ESR ceramic capacitor on VOUT for stability and transient performance. Using smaller values (e.g., 1µF) causes phase margin degradation, leading to oscillation under load steps, as confirmed in Figure 12 of DS39917 Rev. 5-2. The 2.2µF value is validated across -40°C to +85°C.
Is AP7381-33V-A qualified for automotive applications?
AP7381-33V-A itself is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AP7381-33Y-TC with AEC-Q100 Grade 1 qualification) in SOT89 packaging. The TO92 version lacks PPAP documentation, IATF 16949 traceability, and extended temperature validation required for automotive use.
How does the thermal shutdown hysteresis improve system reliability?
The +20°C hysteresis (trip at +160°C, resume at +140°C) prevents rapid on-off cycling during marginal overheating events. This avoids output voltage instability and stress on downstream components, enabling graceful degradation and automatic recovery-critical in sealed enclosures like smart meters where forced cooling is unavailable.
AP7381-33V-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 100mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 2.5 µA
- Current - Supply (Max):
- 25 µA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Current Limit, Thermal Shutdown
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
AP7381-33V-A FAQ
1.How can I place an order for AP7381-33V-A through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7381-33V-A 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 AP7381-33V-A reliable?
The price and inventory of AP7381-33V-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7381-33V-A is usually 5 days.
3.What payment methods are accepted for AP7381-33V-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7381-33V-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7381-33V-A?
AP7381-33V-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7381-33V-A 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 AP7381-33V-A?
For technical support, including AP7381-33V-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7381-33V-A requirements.
6.How does Aetrix verify that AP7381-33V-A is sourced from the original manufacturer or authorized distributors?
All AP7381-33V-A 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 AP7381-33V-A meets industry standards.
7.What is the process for return or replacement of AP7381-33V-A?
All AP7381-33V-A units undergo pre-shipment inspection (PSI). If there is an issue with AP7381-33V-A, 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 AP7381-33V-A part is unused and in its original packaging.
Return procedure for AP7381-33V-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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