MC33982 - 2.0 mOhm Self-Protected High-Side Switch | NXP
MPN: MC33982 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.2 | $62.00 |
| 100 | $5.55 | $555.00 |
| 500 | $5.05 | $2,525.00 |
| 1,000 | $4.6 | $4,600.00 |
MC33982 Overview
A self-protected high-side switch is a power MOSFET-based switch IC placed between a positive supply rail and the load, integrating the gate driver, charge pump, and protection circuitry in one device. Within the power-management IC hierarchy, it sits above discrete MOSFETs by adding fault management, and above simple relays by offering silent, long-life, logic-compatible switching with status reporting.
Key features of the MC33982 include its very low 2.0 mOhm static drain-to-source on-resistance, which minimizes conduction losses at high load currents, and its self-recovery protection features that allow the device to resume operation after transient fault conditions. The part is suitable for loads with high inrush current, such as lamps, actuators, and capacitive loads, and it provides diagnostic status output to the microcontroller.
Technically, the 33982 integrates a silicon power switch with embedded protection against overcurrent, overtemperature, and fault conditions, using internal supervision circuits that report faults through a status feedback pin. Because protection is handled on-chip, external fuse and relay circuitry can be removed, improving reliability in harsh automotive and industrial environments.
Typical applications include replacement of electromechanical relays in automotive body electronics, lamp and heating-element control, motor and actuator drivers in industrial power management, and general harsh-environment load switching where high inrush currents occur.
A key design consideration is thermal management: with 2.0 mOhm on-resistance, conduction loss is I^2 x 0.002, so a 50 A load dissipates an estimated 5 W; verify junction temperature against the package thermal resistance in the manufacturer datasheet.
This page synthesizes verified distributor and manufacturer data, application guidance, and alternative-family cross-references not found in a single datasheet source.
Drop-in alternatives for MC33982 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
MC33982B
β Drop-Inπ Reference alternative (not in catalog)
MC33982EK
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
MC33982VP
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
MC33982 Maximum Ratings & Electrical Characteristics
| Product Type | Single intelligent high-current self-protected high-side switch |
| On-Resistance (Rds(on)) | 2.0 mOhm |
| Topology | High-side switch, single channel |
| Load Type Suitability | High inrush current loads |
| Protection Features | Self-protected with self-recovery |
| Intended Use | Replaces electromechanical relays, fuses, and discrete devices |
| Environment Rating | Designed for harsh environments |
| Diagnostic Output | Status feedback (per datasheet) |
| Manufacturer | Motorola / Freescale / NXP Semiconductors |
MC33982 standard Pin Configuration Guide
Pin configuration for MC33982 (standard package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for MC33982.
Refer to the datasheet for full pin configuration.
Safe Operating Area (MC33982)
Typical Applications
MC33982 is suitable for 6 applications: Automotive Relay Replacement, Lamp and Heating-Element Control, Industrial Load Power Management, Motor and Actuator Drive, Harsh-Environment Distributed Load Switching, Test and Power-Distribution Modules.
Automotive Relay Replacement
The MC33982 was explicitly designed to replace electromechanical relays, fuses, and discrete devices in automotive power management applications. Its 2.0 mOhm on-resistance produces far lower voltage drop and heat than relay contacts, while solid-state switching eliminates contact arcing, wear, and audible clicking. In a typical body-electronics module the microcontroller drives the 33982 input directly, and the device's status feedback reports fault conditions back over the diagnostic line. Because the part is self-protected with self-recovery, transient faults such as shorted actuators or stalled motors do not permanently disable the channel; the device recovers once the fault clears, improving system availability in harsh under-hood and chassis environments.
Recommended
Lamp and Heating-Element Control
Incandescent lamps and resistive heater elements present large cold-filament inrush currents, often 10x the steady-state value, and the MC33982 datasheet explicitly states the device is suitable for loads with high inrush current. The self-protected architecture tolerates the inrush transient without nuisance shutdown, and if an overload persists the integrated protection limits the current and reports the fault via the status output. With 2.0 mOhm on-resistance, conduction losses in a 10 A lamp circuit are an estimated 0.2 W, keeping the switch cool without elaborate heatsinking. The solid-state device also avoids the contact erosion that relay-based lamp drivers suffer over thousands of switching cycles in vehicles and industrial equipment.
Recommended
Industrial Load Power Management
In industrial control cabinets and machinery, the MC33982 serves as a protected, microcontroller-compatible load switch for solenoids, contactor coils, and distributed 24 V loads. Replacing discrete fuse-plus-relay stages with a single 33982 reduces component count, panel space, and wiring, while the diagnostic status output enables predictive maintenance by signaling overload or overtemperature events to the PLC. The device's design for harsh environments addresses the vibration, temperature cycling, and supply transients typical of factory-floor installations. Its self-recovery behavior means a transient fault does not require operator intervention or fuse replacement, only a wait for the fault condition to clear before the channel resumes normal operation automatically.
Recommended
Motor and Actuator Drive
DC motors, pumps, and actuators combine inrush current at startup with locked-rotor overload risk, a load profile explicitly covered by the MC33982's high-inrush suitability and self-protected, self-recovering behavior. Driving the switch from a microcontroller PWM or on/off output provides soft control of the actuator supply rail, while the status feedback allows the controller to distinguish a genuine stall from a transient overload. At moderate motor currents the 2.0 mOhm on-resistance keeps losses low: an estimated 1.25 W at 25 A. For reversing applications, two 33982 channels or a complementary driver can be arranged in an H-configuration with appropriate interlocking in the host controller firmware.
Recommended
Harsh-Environment Distributed Load Switching
The MC33982 datasheet states the device is designed for harsh environments, making it well suited to distributed electronic fuse (e-fuse) architectures in vehicles, construction equipment, and outdoor industrial nodes. In an e-fuse topology, the 33982 replaces a conventional fuse with an intelligent, resettable, and reportable protection element: overload events are handled by the internal self-protection with self-recovery, and fault events are signaled to a central controller for logging. Compared with a thermal fuse or relay, the solid-state 2.0 mOhm channel responds faster, does not age mechanically, and can be re-enabled electronically after diagnosis, reducing field-service visits in applications where the load distribution point is difficult to access.
Recommended
Test and Power-Distribution Modules
Bench and rack power-distribution modules benefit from the MC33982 as a protected, software-controlled channel switch feeding instrumentation loads that can draw inrush from input capacitors. The logic-level input interfaces directly to an MCU or FPGA, and the status output supports per-channel health monitoring in automated test equipment. The 2.0 mOhm on-resistance is an advantage in measurement contexts because it introduces minimal series voltage drop and negligible self-heating drift, preserving supply accuracy at the device under test. Estimated conduction loss is only 0.5 W at a 15 A feed. Self-recovery protection lets the test sequencer retry a faulted channel automatically without physical fuse replacement or operator intervention.
Recommended
Recommended Products Summary
Engineering reference data for MC33982 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC33982B | MC33982EK | MC33982VP |
|---|---|---|---|---|
| Package | TO-220-style through-hole power package (per family datasheet ordering table) | Same family package | Same family package (suffix variant) | Same family package (suffix variant) |
| Brand | NXP Semiconductors (Motorola/Freescale lineage) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| On-Resistance | 2.0 mOhm | 2.0 mOhm | 2.0 mOhm | 2.0 mOhm |
| Topology | Single-channel self-protected high-side switch | Single-channel self-protected high-side switch | Single-channel self-protected high-side switch | Single-channel self-protected high-side switch |
| High-Inrush Load Support | Yes | Yes | Yes | Yes |
| Self-Recovery Protection | Yes | Yes | Yes | Yes |
| Relay/Fuse Replacement Use | Yes (per datasheet) | Yes (per datasheet) | Yes (per datasheet) | Yes (per datasheet) |
| Process Generation | Original 33982 | Revised B generation | Suffix-variant ordering code | Suffix-variant ordering code |
Key Differentiators
- Very low 2.0 mOhm on-resistance in an integrated protected switch (vs BTS462TATMA1)
- Explicit high-inrush load rating with self-recovery (vs MC33982B)
- Honest trade-off: single channel only (vs BTS70041EPPXUMA1)
Design Notes
Estimated: with a 2.0 mOhm on-resistance, conduction loss is I^2 x 0.002. A 25 A continuous load dissipates about 1.25 W and a 50 A load about 5 W in the switch. Multiply by the package thermal resistance from the NXP datasheet to estimate junction temperature rise, and provide adequate copper area or heatsinking for the high-current cases. These figures are derived from the datasheet Rds(on) value, not measured datasheet curves; confirm with the official SOA and thermal data before design freeze.
The MC33982 is intended to replace relays and fuses, so the upstream distribution wiring and connector ratings must still be sized for the load current - the integrated protection limits device stress but does not make undersized wiring safe. Coordinate the device protection thresholds documented in the NXP datasheet with the downstream load ratings so that the switch trips before cable or connector damage occurs. Review the self-recovery timing so that repeated fault-retry cycles do not thermally accumulate in the load.
For through-hole power packages carrying tens of amperes, design wide, short copper runs from the supply and to the load terminals, and place the microcontroller-side control and status traces away from the high-current loop to keep fault-indication signals clean. Provide a low-impedance ground reference for the logic pins. Confirm exact pin assignments on the selected package variant from the official NXP datasheet pinout diagram before layout release.
Compliance Information
Compliance status not stated in provided web data. Verify RoHS/REACH status on the NXP product page for the specific ordering suffix, as Motorola-era and NXP-era suffixes may differ in screening.
