MCP1402T-E/OT vs STGAP2SICDTR Gate Driver Comparison
Quick verdict
For simple, single-channel low-side MOSFET or IGBT drive applications with limited board space and supply voltages up to 18 V, the MCP1402T-E/OT is the straightforward choice due to its compact SOT-23-5 package and solid 500 mA drive capability. For isolated, dual-channel gate driving where high transient immunity, galvanic isolation, and high peak drive current up to 4 A per channel are required—especially in half-bridge or bridgeless topologies—the STGAP2SICDTR is the superior option despite its larger footprint and more complex power supply requirements.
Spec comparison table
| Spec | MCP1402T-E/OT | STGAP2SICDTR | Notes |
|---|---|---|---|
| Channel type | Single | 2 | ST device offers dual channels; useful for bridge configurations |
| Current peak output source/sink | 500 mA / 500 mA | 4 A / 4 A | ST drives 8× higher peak current; better for large MOSFETs/IGBTs |
| Driven configuration | Low-Side | Not specified (isolated dual channel) | MCP1402T limited to low-side; ST device supports isolated high/low-side |
| Gate type supported | IGBT, N/P MOSFET | Not explicitly listed; assumed MOSFET | MCP1402T explicitly supports IGBT and MOSFET; ST implied MOSFET |
| Input type | Non-inverting | Not explicitly stated | MCP1402T is non-inverting; ST likely standard CMOS compatible |
| Logic voltage VIL/VIH | 0.8 V / 2.4 V | Logic thresholds: ~0.33·VDD high, ~0.66·VDD low | MCP1402T has fixed thresholds; ST thresholds scale with VDD |
| Supply voltage range | 4.5 V – 18 V | 3.1 V – 5.5 V | MCP1402T supports wider supply voltage; ST limited to 5.5 V max |
| Operating temperature range | -40 °C to 150 °C (TJ) | -40 °C to 125 °C | MCP1402T has slightly wider temperature range |
| Package | SOT-23-5 (SC-74A, SOT-753) | 36-SO (36-BSOP, 7.50 mm wide) | MCP1402T is much smaller; ST is large, suitable for complex layouts |
| Rise/fall time typical | 19 ns / 15 ns | 30 ns / 30 ns | MCP1402T is faster switching; better for high-frequency applications |
| Propagation delay typical | Not specified | 75 ns (typ), 90 ns (max) | MCP1402T faster response; ST slower due to isolation and capacitive coupling |
| Voltage isolation | None | 3535 Vrms (typical), 5000 Vrms max | ST offers galvanic isolation; MCP1402T none |
| Common mode transient immunity | Not specified | 100 V/ns (min) | ST suitable for noisy environments and isolated applications |
| Package pins | 5 pins | 32 leads | MCP1402T minimal pins; ST complex pinout with interlocking and isolation features |
| Quiescent supply current typical | Not specified | 1.8 mA (typ), standby 550 µA | MCP1402T likely lower but unspecified; ST higher quiescent current |
| UVLO thresholds | Not specified | 15.5 V (typ) turn-on | ST has integrated UVLO; MCP1402T no UVLO specified |
| Isolation withstand voltage | None | 1.2 kV repetitive, 5 kV transient | ST suitable for safety-critical isolated designs |
| Switching frequency max | Not specified | 1 MHz max | ST suitable for up to 1 MHz switching |
| Safe clamp voltage | Not specified | 1.3 V min, 2 V typ, 2.6 V max | ST includes safe clamp feature; MCP1402T no clamp info |
| Thermal resistance junction-to-ambient | Not specified | 52 °C/W | ST’s large package means higher thermal resistance; MCP1402T expected lower |
| Mounting type | Surface mount | Surface mount | Both surface mount, but package size differs significantly |
Design trade-offs
The MCP1402T-E/OT is a basic, non-isolated low-side gate driver optimized for simplicity, small PCB footprint, and wide supply voltage range up to 18 V. Its 500 mA peak drive current is sufficient for driving MOSFETs or IGBTs of moderate gate charge in low- to mid-power applications. The small SOT-23-5 package reduces board area and is easier to route, but it lacks isolation, limiting its use in half-bridge or isolated gate driving topologies.
The STGAP2SICDTR is a capacitive coupling isolated gate driver with two channels, each capable of sourcing and sinking up to 4 A peak. This makes it suitable for driving large MOSFETs or IGBTs in high-power, high-frequency switching applications where fast current pulsing is critical. The isolation barrier (up to 3.5 kVrms typical) and high common mode transient immunity (100 V/ns) enable its use in demanding industrial or automotive environments with noisy grounds or multiple floating potentials.
The trade-off is in size, complexity, and supply requirements. The ST device’s 36-SO package is much larger and more complex to route; it also requires a 3.1–5.5 V supply voltage on the logic side and a separate isolated power supply for the high-side driver, increasing BOM cost and layout complexity. Its slower propagation delay (75 ns typical vs. sub-20 ns for MCP1402T) and longer rise/fall times (30 ns vs. 15–19 ns) reflect the additional isolation and capacitive coupling stages, which may limit switching speed in ultra-high-frequency designs.
Thermal management differs significantly. The STGAP2SICDTR’s large package and higher quiescent current (1.8 mA typical) mean more power dissipation, especially under high switching currents; its 52 °C/W thermal resistance demands good PCB thermal design. The MCP1402T, with no published thermal resistance but a small package and lower current, is easier to cool but limited in drive strength.
Firmware and layout considerations also differ. MCP1402T’s single-channel, low-side only, and non-inverting input simplifies control logic. The ST device’s dual channels, integrated interlocking, and isolation require more careful interface design, including proper handling of UVLO, watchdog, and safe clamp functions. The ST device’s fixed logic thresholds scaled with VDD require consideration when interfacing with different logic families.
Cost-wise, the MCP1402T will be significantly cheaper and easier to source for volume production, while the STGAP2SICDTR’s complex isolation and packaging make it more expensive and specialized.
Use-case fit
Choose MCP1402T-E/OT when…
- You need a compact, single low-side gate driver for a discrete MOSFET or IGBT in a cost-sensitive design.
- Your supply voltage ranges from 4.5 V to 18 V and you do not require isolation or high peak current.
- The switching frequency is moderate and fast propagation delay (<20 ns) is beneficial.
- Board space is limited and a small SOT-23-5 package is required.
- Design simplicity and minimal external components are priorities.
Choose STGAP2SICDTR when…
- You require isolated dual-channel gate drivers with robust galvanic isolation up to 3.5 kVrms.
- Driving large MOSFETs or IGBTs needing high peak currents (up to 4 A) for fast switching.
- Working in high common-mode transient environments (100 V/ns) typical in industrial or automotive.
- Implementing half-bridge or full-bridge topologies where dual isolated channels and interlocking are needed.
- Operating at switching frequencies up to 1 MHz with controlled propagation delay and safe clamp features.
Drop-in compatibility
These two parts are not pin-compatible or footprint-compatible. The MCP1402T-E/OT is a 5-pin SOT-23-5 package designed for simple low-side drive, while the STGAP2SICDTR is a 32-lead 36-SO package with isolated dual channels and additional control pins (interlocking, watchdog, safe clamp). Substituting one for the other requires a complete redesign of the PCB, power supplies, and control logic. No direct drop-in replacement exists between these devices.
Alternatives to consider
- MIC4452 (Microchip): High current (up to 9 A peak) non-isolated gate driver in a robust SOIC package, good for high power MOSFET driving without isolation.
- UCC37322 (Texas Instruments): Dual 9 A peak current, non-isolated gate driver with low propagation delay, suitable for half-bridge MOSFET driving.
- ISO5451 (Texas Instruments): Isolated dual-channel gate driver with galvanic isolation