AP7383-33Y-13 - 3.3V 150mA Ultra-Low Iq LDO | Diodes Inc
MPN: AP7383-33Y-13 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.55 | $0.55 |
| 10 | $0.45 | $4.50 |
| 100 | $0.3 | $30.00 |
| 500 | $0.22 | $110.00 |
| 1,000 | $0.18 | $180.00 |
| 2,500 | $0.1477 | $369.25 |
AP7383-33Y-13 Overview
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable, low-ripple output voltage even when the input voltage approaches the output voltage. LDOs sit within the broader power management IC hierarchy: linear regulator -> voltage regulator -> power management IC -> semiconductor. Unlike switching converters, LDOs do not generate EMI switching noise, which is essential for USB, audio, and instrumentation supplies. The AP7383's ultra-low Iq extends battery standby time in IoT and portable devices.
Key features of the AP7383-33Y-13 include up to 30 V wide input voltage range, low dropout at 150 mA, internal current limit protection, thermal shutdown, and ultra-low quiescent current. The high-accuracy output (typically ±2%) supports powering MCUs, sensors, and analog/RF blocks without additional regulation stages. The SOT-89-3 package provides good thermal performance for its small footprint via an exposed tab, enabling up to 150 mA continuous load without external heatsinking.
The AP7383 family uses a low-Iq CMOS architecture with an internal bandgap reference. The wide VIN tolerance (up to 30 V) allows the same part to derive a 3.3 V rail directly from industrial 24 V buses, USB VBUS, or 5 V system rails with substantial transient headroom. The integrated current limit and thermal shutdown form a robust fault envelope for harsh USB-charging or hot-plug scenarios.
Typical applications include USB peripherals and chargers, portable/battery-powered devices, instrumentation, IoT sensor nodes, and post-regulation after a switching converter. The wide VIN tolerance makes the AP7383 well suited to industrial 24 V systems stepping down to 3.3 V logic rails. Always-on microcontrollers and wireless MCUs in remote or solar applications benefit from the ultra-low quiescent current.
When designing with this part, ensure input and output capacitors are placed as close as possible to the pins and the exposed thermal tab is soldered to sufficient copper pour (typically >= 100 mm^2 of 1-oz copper) to dissipate heat at the rated 150 mA load. Avoid exceeding the absolute maximum input voltage during hot-plug events; add TVS protection on USB VBUS inputs that may see surge transients.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical PCB design notes not found on the manufacturer datasheet alone. Engineers can use the comparison_table to evaluate same-package drop-in options, and the design_notes section provides actionable guidance on capacitor sizing and thermal copper area for reliable operation up to the rated 150 mA load.
Drop-in alternatives for AP7383-33Y-13 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AP7383-33Y-13
✅ Drop-In✓ In Stock
$0.1477 / Unit
View Datasheet →AP7381-33Y-13
✅ Drop-In📋 Reference alternative (not in catalog)
AP7384-33Y-13
✅ Drop-In📋 Reference alternative (not in catalog)
AP7383-30Y-13
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AP7383-50Y-13
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AP7383-33Y-13 Maximum Ratings & Electrical Characteristics
| Output Type | Fixed 3.3 V |
| Input Voltage Range | Up to 30 V |
| Output Voltage | 3.3 V (nominal) |
| Output Current (Continuous) | 150 mA |
| Topology | LDO (Low-Dropout) linear regulator |
| Thermal Protection | Thermal shutdown (integrated) |
| Package | SOT-89-3 (Y, 3+Tab) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Tape & Reel Quantity | 2,500 per reel |
| Enable Pin | No (fixed-output, no enable) |
AP7383-33Y-13 Pin Configuration
| Pin 1 | VIN — Input voltage supply (up to 30 V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | VOUT — Regulated 3.3 V output (up to 150 mA) |
| Pin TAB | GND/Thermal — Exposed metal tab; must be soldered to PCB copper for thermal dissipation (electrically connected to GND internally on Y-package SOT-89-3 AP7383) |
Typical Applications
AP7383-33Y-13 is suitable for 6 applications: USB Peripherals & VBUS Power, Portable / Battery-Powered Devices, Industrial 24V Bus to 3.3V Logic, IoT Sensor Nodes & Always-On Systems, Post-Regulation after Switching Converter, Test & Measurement Instruments.
USB Peripherals & VBUS Power
The AP7383-33Y-13's 30 V wide VIN tolerance and ultra-low quiescent current make it ideal for USB peripherals and VBUS-powered devices. Its 3.3 V fixed output directly powers low-voltage MCU cores and USB-to-UART bridge ICs without external feedback resistors. With 150 mA continuous output it comfortably supplies small peripherals, and unlike a switching converter it adds no EMI that could interfere with USB data lines - critical for USB 2.0/3.0 signal integrity. A 1 uF input capacitor handles VBUS hot-plug transients.
Recommended
Portable / Battery-Powered Devices
The AP7383-33Y-13's ultra-low quiescent current extends battery standby time in wireless sensors, remote controls, and handheld instruments. It accepts a wide VIN range up to 30 V, allowing direct operation from multi-cell battery packs or USB chargers. The fixed 3.3 V output is compatible with low-power MCUs and Bluetooth Low Energy SoCs. At dropout, the low Vdrop minimizes battery cutoff waste, while the SOT-89-3 package keeps the regulator footprint minimal in compact portable designs.
Recommended
Industrial 24V Bus to 3.3V Logic
The AP7383-33Y-13's 30 V wide VIN tolerance supports direct step-down from a 24 V industrial bus to 3.3 V logic. This eliminates the need for a switching pre-regulator in cost-sensitive PLC designs. Its 150 mA output is sufficient to power an MCU plus isolated communication ICs. The SOT-89-3 package with exposed tab provides adequate thermal dissipation for continuous industrial operation when soldered to a copper pour of >= 100 mm^2 on a 1-oz board.
Recommended
IoT Sensor Nodes & Always-On Systems
The AP7383-33Y-13's ultra-low quiescent current is critical for IoT sensor nodes that spend most of their time in deep-sleep mode. It maintains a stable 3.3 V rail for wireless MCUs and sensors at microampere standby current. The 150 mA load rating supports short active-mode bursts for radio transmission. The wide VIN tolerance allows direct battery or solar panel input up to 30 V, simplifying power tree design in remote or energy-harvesting applications.
Recommended
Post-Regulation after Switching Converter
The AP7383-33Y-13 functions as an effective post-regulator following a switching DC-DC converter to clean up switching ripple for noise-sensitive analog blocks. Its 30 V VIN tolerance allows it to operate from any upstream rail. Placing it downstream of a buck converter provides the cleanest 3.3 V supply for ADCs, DACs, and analog front-ends. The ultra-low Iq prevents wasted power when the analog subsystem is in standby.
Recommended
Test & Measurement Instruments
The AP7383-33Y-13's high accuracy and low dropout characteristics support test and measurement instrument designs. Its fixed 3.3 V output is widely compatible with measurement SoCs and displays. The 30 V wide VIN allows operation from laboratory bench supplies or battery packs. The LDO's lack of switching noise is essential when powering sensitive analog measurement front-ends. The SOT-89-3 footprint simplifies layout in space-constrained handheld instruments.
Recommended
Recommended Products Summary
Engineering reference data for AP7383-33Y-13 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AP7381-33Y-13 | AP7384-33Y-13 | AP7383-30Y-13 | AP7383-50Y-13 |
|---|---|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated |
| Package | SOT-89-3 | SOT-89-3 (same) | SOT-89-3 (same) | SOT-89-3 (same) | SOT-89-3 (same) |
| Output Voltage | 3.3 V | 3.3 V (same) | 3.3 V (same) | 3.0 V | 5.0 V |
| Output Current | 150 mA | 150 mA (same) | 150 mA (same) | 150 mA (same) | 150 mA (same) |
| Input Voltage Range | Up to 30 V | Up to 18 V | Up to 40 V | Up to 30 V | Up to 30 V |
| Topology | LDO linear regulator | LDO linear regulator | LDO linear regulator | LDO linear regulator | LDO linear regulator |
| Quiescent Current | Ultra-low (uA range) | Ultra-low (uA range) | Ultra-low (uA range) | Ultra-low (uA range) | Ultra-low (uA range) |
| Drop-in Compatible | Reference part | Yes (verify VIN) | Yes (verify VIN headroom) | Yes if 3.0 V output is acceptable | Pin-compatible, but different VOUT |
Key Differentiators
- Ultra-wide 30 V input voltage range (vs AP7381-33Y-13)
- Ultra-low quiescent current for always-on applications (vs Standard 3.3V LDOs with mA-range Iq)
- Compact SOT-89-3 package with thermal tab (vs Smaller SOT-23-3 LDOs at similar ratings)
Design Notes
Estimated: At VIN = 24 V, VOUT = 3.3 V, and IOUT = 150 mA (worst-case load), power dissipation is approximately (24 V - 3.3 V) * 0.150 A = 3.105 W. The SOT-89-3 thermal resistance (theta_JA) is approximately 150 C/W on a minimal JEDEC test board (per typical Diodes Inc SOT-89 datasheets), which would result in a junction temperature rise of approximately 466 C above ambient - far exceeding safe limits. In practice, the device will enter current-limit/thermal protection and not deliver full 150 mA continuously at high VIN. For continuous 150 mA operation at VIN >= 10 V, solder the exposed tab to >= 100 mm^2 of 1-oz PCB copper pour and consider derating output current at elevated ambient temperature.
Place the input and output capacitors as close as possible to the VIN and VOUT pins to minimize parasitic inductance and ensure regulator stability. According to the AP7383 datasheet typical application, a 1 uF ceramic capacitor on the input and a 1 uF ceramic capacitor on the output are typically sufficient. Use X5R or X7R ceramic dielectrics for low ESR across temperature. The exposed thermal tab must be soldered to a copper pad of at least 100 mm^2 to meet the rated thermal performance.
Do not exceed the absolute maximum input voltage of 30 V (or as specified). For USB VBUS inputs that can see surge transients beyond 30 V during hot-plug or ESD events, add a TVS diode (e.g., 24 V SMBJ) on VIN to ground. Do not load the output beyond 150 mA continuous without verifying the thermal envelope. Avoid using high-ESR tantalum or electrolytic output capacitors unless the datasheet explicitly permits them; ceramic X5R/X7R are preferred for stability.
Compliance Information
RoHS compliant and lead-free per Diodes Incorporated product page and DigiKey listing. AEC-Q100 status not declared on distributor pages for this part; confirm with manufacturer if automotive qualification is required.
