MIC94030BM4 - P-Channel 16V MOSFET, SOT-143 | Microchip
MPN: MIC94030BM4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.55 | $5.50 |
| 100 | $0.42 | $42.00 |
| 500 | $0.35 | $175.00 |
| 1,000 | $0.29 | $290.00 |
MIC94030BM4 Overview
A P-Channel MOSFET is a type of field-effect transistor in which the channel is formed by inverting the surface of an n-type semiconductor with a negative gate-to-source voltage (VGS). P-Channel devices are commonly used for high-side switching because they can be turned on by pulling the gate to ground, simplifying bootstrap drive circuitry compared to N-Channel high-side switches. They sit within the broader transistor taxonomy: MOSFET -> field-effect transistor -> transistor -> discrete semiconductor. Their primary role in modern electronics is load switching, power gating, level shifting, and battery protection in portable and USB-powered systems.
Key features of the MIC94030BM4 include a logic-level compatible gate threshold (typically requiring only -2.5V to fully enhance), a low-threshold variant suitable for direct microcontroller GPIO drive without level shifters, and an integrated body diode for inductive load handling. The SOT-143 package with the exposed tab offers an enhanced thermal path with a power dissipation rating of 568 mW (Ta) per the DigiKey listing, supporting compact PCB layouts.
The device uses an advanced silicon-gate process technology that minimizes gate charge (Qg) and on-resistance product (FOM), enabling fast switching transitions with minimal drive losses. Its low input capacitance reduces the burden on the upstream GPIO pin and permits PWM-based dimming, current limiting, or power-rail sequencing at frequencies up to several hundred kHz. The architecture also tolerates wide gate-drive voltage ranges up to the absolute maximum VGS rating.
Typical applications include USB port power switching in laptop and tablet designs, load management in battery-powered portable electronics such as smartphones and wearables, high-side switching for LCD backlight circuits, and power-rail gating for low-power subsystems in IoT devices. Its small footprint also suits space-constrained designs such as hearing aids, wireless earbuds, and remote sensor nodes.
When designing with the MIC94030BM4, ensure the gate-source voltage stays within the absolute maximum ratings and use a pull-up resistor on the gate to guarantee the MOSFET defaults to OFF at power-up. For PWM operation above 10 kHz, verify that gate-charge losses remain within your thermal budget; otherwise consider a lower-Qg variant.
This page synthesizes distributor pricing, drop-in alternatives from same-brand and cross-brand sources, and practical design notes not found in the manufacturer datasheet alone - giving purchasing and design engineers a single decision-ready reference.
Drop-in alternatives for MIC94030BM4 — 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:
MIC94031BM4
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MIC94030YM4
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MIC94030BM4 Maximum Ratings & Electrical Characteristics
| FET Type | P-Channel MOSFET |
| Configuration | Single with built-in diode and resistor |
| Drain-to-Source Voltage (Vdss) | 16 V |
| Continuous Drain Current (Id) at 25C | 1 A |
| Rds On (Max) at Id, Vgs | 450 mOhm |
| Power Dissipation (Ta) | 568 mW |
| Mounting Type | Surface Mount |
| Package | SOT-143 (4-pin, 3+Tab) |
| Package Body Material | Plastic / Epoxy |
| Gate Drive | Logic-level, Vgs(th) low |
| Technology | Silicon gate, Metal-Oxide Semiconductor |
| RoHS Status | Compliant |
| Lead-Free | Yes |
MIC94030BM4 Pin Configuration
| Pin 1 | Gate — Gate control input; drive low to turn MOSFET on |
| Pin 2 | Source — Source terminal; typically tied to higher-voltage rail (e.g., VBUS) |
| Pin 3 | Drain — Drain terminal; connected to the load |
| Pin 4 | Tab / Drain — Thermal tab; electrically common with Drain (pin 3) |
Safe Operating Area (SOT-143)
Typical Applications
MIC94030BM4 is suitable for 6 applications: USB VBUS High-Side Load Switch, Li-ion Battery Power Path Gating, LCD Backlight Power Switch, IoT Sensor Module Power Gating, Wearable and Hearable Device Power Switch, Level Shifter and Signal Inversion.
USB VBUS High-Side Load Switch
The MIC94030BM4 is ideal for USB VBUS high-side switching because its P-Channel polarity allows the load to be turned on by pulling the gate to ground via a microcontroller GPIO, with no charge pump or bootstrap required. With 16V Vdss and 1A continuous drain current it comfortably handles USB 2.0/3.0 VBUS rails (5V, up to 500mA typical, 1A peak). At a typical USB load of 500mA, conduction loss is I^2 x Rds(on) = 0.25 x 0.45 = 0.11W, well within the 568mW SOT-143 thermal rating. Its logic-level gate threshold permits direct drive from 3.3V GPIO, eliminating level-shift circuitry.
Recommended
Li-ion Battery Power Path Gating
In single-cell Li-ion systems (3.0-4.2V range), the MIC94030BM4 acts as a reverse-current protection and power-path switch between the battery and the system load. Its P-Channel topology connects the source to the battery and drain to the load; pulling the gate to ground energizes the path. The 16V Vdss rating provides generous headroom above the 4.2V Li-ion peak, while the 450 mOhm Rds(on) keeps voltage drop below 50mV at 100mA load - critical for accurate fuel-gauging. The SOT-143 tab serves as a thermal pad, dissipating the modest I^2R losses in compact wearable designs.
Recommended
LCD Backlight Power Switch
The MIC94030BM4 is well suited as the high-side switch for LED-driver and LCD backlight power-rail gating in handheld displays. Because the gate can be PWM-driven at audio-band frequencies to dim the backlight, the MOSFET's low gate charge (Qg) and fast switching transitions minimize drive losses. At a typical 100mA backlight current, the 450 mOhm Rds(on) dissipates only 4.5mW - well within the SOT-143 thermal envelope - and the small footprint allows placement adjacent to the LED driver IC. Designers can pair the MIC94030BM4 with a constant-current LED driver to enable PWM dimming without flicker.
Recommended
IoT Sensor Module Power Gating
For IoT sensor nodes and remote wireless modules, the MIC94030BM4 enables duty-cycled power gating of sub-circuits such as radios, sensors, and signal-conditioning stages. Its 1A continuous rating handles peak bursts from radio transmitters while the low Rds(on) limits quiescent conduction loss during sleep-active transitions. The 16V Vdss rating allows the part to be used on 3.3V, 5V, or 12V rails in industrial sensor hubs. Combined with a low-power microcontroller GPIO, the MIC94030BM4 supports aggressive duty-cycling for battery-life extension in unattended sensor installations.
Recommended
Wearable and Hearable Device Power Switch
The MIC94030BM4 in SOT-143 (3+Tab) is optimized for ultra-compact wearable and hearable designs where board area is severely constrained. With a 1A current rating and a footprint of only a few square millimeters, it provides the necessary load-switch capability for audio amplifiers, BLE radios, and haptic drivers in earbuds and smartwatches. Its low gate-threshold voltage allows direct drive from the host MCU's low-voltage GPIO (1.8V or 3.3V), avoiding extra logic-level shifter components. The exposed tab further aids thermal dissipation during peak current bursts in wireless transmissions.
Recommended
Level Shifter and Signal Inversion
Beyond load switching, the MIC94030BM4 can be used as a discrete level shifter or signal inverter in mixed-voltage logic interfaces. By tying the source to a higher-voltage rail and using the gate as a logic input, the drain output swings between that rail and ground - effectively inverting and level-shifting a low-voltage GPIO signal up to a higher voltage domain. Its 16V Vdss supports level shifting to 12V or 15V logic rails, while the logic-level gate threshold permits input drive from 3.3V microcontrollers. The fast switching transitions preserve signal integrity at moderate digital clock rates up to several hundred kHz.
Recommended
Recommended Products Summary
Engineering reference data for MIC94030BM4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MIC94031BM4 |
|---|---|---|
| Package | SOT-143 (3+Tab) | SOT-143 - same |
| Brand | Microchip Technology | Microchip Technology |
| FET Type | P-Channel MOSFET | P-Channel MOSFET |
| Drain-to-Source Voltage (Vdss) | 16 V | 16 V (same family) |
| Continuous Drain Current (Id) | 1 A | 1 A (same family) |
| Power Dissipation (Ta) | 568 mW | 568 mW |
| Gate Threshold | Logic-level | Logic-level |
Key Differentiators
- Compact SOT-143 (3+Tab) package with exposed thermal tab (vs MIC94031BM4)
- Logic-level gate drive threshold (vs MIC94031BM4)
- Low Rds(on) at -4.5V Vgs for low conduction loss (vs MIC94031BM4)
Design Notes
Always add a pull-up resistor from gate to source (typically 100 kOhm) so the MOSFET defaults to OFF at power-up and during MCU reset. Without this resistor the gate floats and the load may spuriously energize. Also ensure the gate-source voltage stays within the absolute maximum rating (typically +/-8V or +/-12V per datasheet) to avoid gate oxide breakdown.
Estimated: at Id=1A continuous and Rds(on)=450 mOhm, conduction dissipation is I^2 x R = 1 x 0.45 = 0.45W. The SOT-143 568mW rating assumes a standard JEDEC test board (1 sq. inch Cu); derate linearly to 0.28W at 70C ambient. For continuous 1A operation, copper-pour thermal management or a heatsink may be required to maintain junction temperature below 150C.
Place the MIC94030BM4 as close as practical to the load and use a wide copper pour on the drain (tab) to maximize thermal dissipation. Keep the gate trace short to minimize parasitic inductance, which can cause ringing during fast switching transitions. A 100nF ceramic bypass capacitor near the source pin helps stabilize the rail during load transients.
For PWM dimming applications above 10 kHz, the gate charge (Qg) becomes the dominant switching-loss contributor. Estimated: with typical Qg ~1-2 nC and a 3.3V gate drive, gate-drive power is P = Qg x Vdrive x fsw = 2nC x 3.3V x 100kHz = 0.66 mW - negligible. However, the body diode reverse-recovery can inject transients into the source rail; add a small snubber or TVS for inductive loads such as relays or motors.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - not designed for automotive applications.
