MCP1402T-E/OT vs STGAP2SICSNCTR: Component Comparison for Gate Driver Applications
Quick verdict
For straightforward low-side MOSFET or IGBT gate driving without isolation requirements, the MCP1402T-E/OT is typically the better choice due to its higher peak output current (500mA) and simpler SOT-23-5 package, making it suitable for compact, cost-sensitive designs. In contrast, the STGAP2SICSNCTR excels in applications requiring galvanic isolation and high-voltage gate driving (up to ±1700 V output), with capacitive coupling technology providing up to 4800 Vpk isolation and very high common-mode transient immunity, making it the preferred option for isolated, high-voltage power stages.
Spec comparison table
| Spec | MCP1402T-E/OT | STGAP2SICSNCTR | Notes |
|---|---|---|---|
| Channel type | Single | Single | Equivalent |
| Current peak output source/sink | 500 mA | 4 A (typical sink) | ST part provides much higher drive current, suitable for large MOSFETs or IGBTs |
| Driven configuration | Low-Side | Not explicitly specified | MCP1402 is low-side specific; ST device designed for high-voltage isolated gate driving |
| Gate type | IGBT, MOSFET (N/P-Channel) | Not specified | MCP1402 explicitly supports common transistor types; ST is general capacitive coupling |
| Input type | Non-Inverting | TTL/CMOS compatible (3.3 V, 5 V hysteresis) | ST has input hysteresis, aiding noise immunity |
| Logic voltage VIL/VIH | 0.8 V / 2.4 V | 0.29·VDD - 0.37·VDD / 0.62·VDD - 0.70·VDD | MCP1402 has fixed thresholds; ST thresholds scale with supply voltage |
| Supply voltage range | 4.5 V – 18 V | 3.1 V – 5.5 V (logic), up to 28 V (VH supply) | MCP1402 supports wider supply range; ST requires separate logic and high-voltage rails |
| Operating temperature range | -40 °C to 150 °C | -40 °C to 125 °C | MCP1402 supports higher max TJ (150 °C vs. 125 °C) |
| Package | SOT-23-5 (SC-74A) | 8-SOIC (3.9 × 5 mm) | MCP1402 is smaller, easier for dense PCB; ST requires larger footprint |
| Rise/Fall time (typical) | 19 ns / 15 ns | 30 ns / 30 ns | MCP1402 is faster, enabling higher switching speeds |
| Propagation delay TPLH / TPHL max | Not specified | 90 ns / 90 ns | MCP1402 likely faster switching response |
| Pulse width distortion max | Not specified | 20 ns | ST datasheet specifies, useful for timing-critical applications |
| Common-mode transient immunity (CMTI) | Not specified | 100 V/ns (min) | ST is designed for high CMTI, critical in isolated and high dv/dt environments |
| Isolation voltage | None | 4800 Vpk | ST provides galvanic isolation; MCP1402 does not |
| Quiescent current (VH supply) | Not specified | 1.3 – 1.8 mA | ST device consumes mA range quiescent current at high-voltage supply |
| Quiescent current (VDD supply) | Not specified | 1.0 – 1.3 mA | ST device quiescent current at logic supply |
| Standby quiescent current (VH) | Not specified | 400 – 550 μA | ST supports standby mode with reduced current |
| Max switching frequency | Not specified | 1 MHz | ST device rated for up to 1 MHz switching frequency |
| Safe clamp voltage | Not specified | 2.0 – 2.3 V (SafeClp) | ST provides active Miller clamp for gate voltage protection |
| Junction temperature max | 150 °C | 150 °C | Both devices rated for similar max TJ |
| Absolute max rating voltage | 20 V | 20 V (logic), 28 V (VH) | ST device requires separate logic and high-voltage rails |
| Output voltage range | Not specified | ±1700 V (operating) | ST device output can handle very high gate voltages directly |
| ESD HBM rating | Not specified | 2 kV | ST device has defined ESD rating |
| Thermal resistance (junction-to-ambient) | Not specified | 123 °C/W | ST device thermal resistance relatively high, affecting thermal design |
| Mounting type | Surface mount | Surface mount | Both surface mount, but different package sizes |
| Number of drivers | 1 | 1 | Equivalent |
| Package dimensions | SOT-23-5 (small) | SOIC-8 (3.9 × 5 mm) | MCP1402 smaller, better for compact designs |
| Input bias current (logic 1) | Not specified | 33 – 70 μA | ST device input current bias relatively high, affects input drive requirements |
| Input bias current (logic 0) | Not specified | 1 μA | Low input current at logic 0 for ST device |
Design trade-offs
The MCP1402T-E/OT is a simple, single-channel low-side driver optimized for MOSFET and IGBT gate drive up to 18 V supply, with symmetrical 500 mA peak source and sink current capability. Its fast rise/fall times (typ. 19 ns/15 ns) and low propagation delay make it suitable for high-frequency switching in low-voltage, non-isolated applications. The small SOT-23-5 package is optimal for compact PCB layouts, minimizing board area and parasitics, which is critical in high-speed gate drive loops.
In contrast, the STGAP2SICSNCTR employs capacitive coupling technology, enabling galvanic isolation up to 4800 Vpk and gate drive voltages up to ±1700 V. This device integrates a high-voltage floating supply (up to 28 V) separate from the logic side (3.1–5.5 V). Its ability to handle high common-mode transient immunity (≥100 V/ns) makes it well-suited for noisy, high-voltage industrial environments, such as motor drives or isolated power converters. The ST device offers significantly higher drive currents (4 A typical sink current), enabling direct drive of large MOSFET or IGBT gates.
However, the ST device’s larger 8-SOIC package and relatively high thermal resistance (123 °C/W) require careful thermal management and board space allocation. The device has higher quiescent currents in the mA range on both logic and high-voltage supplies, which may impact efficiency in standby or low-power modes, whereas the MCP1402T-E/OT is simpler with lower quiescent current (not explicitly specified but typically lower due to simpler architecture).
From a layout perspective, the ST device demands careful placement of decoupling capacitors (1 to 10 μF near supply pins, 100 nF between VDD and GND, VH and GNDISO), and restrictions on PCB layout such as avoiding conductive areas beneath the device to maintain isolation integrity. The MCP1402 is more forgiving in layout, with no isolation requirements.
Firmware or control logic interfacing differs: MCP1402 has fixed logic thresholds (0.8 V low, 2.4 V high), compatible with standard 3.3 V or 5 V logic; ST device logic thresholds scale with VDD, and input bias currents are higher, which may require stronger input drivers or buffering.
Use-case fit
Choose MCP1402T-E/OT when…
- Driving a low-side N-channel MOSFET or IGBT in a non-isolated DC-DC converter or motor control stage with supply voltage up to 18 V.
- Board space is limited and a small SOT-23-5 package is required.
- Switching frequencies up to several hundred kHz are needed with minimal propagation delay and fast rise/fall times.
- Simpler power stage designs where isolation and high-voltage blocking are not required.
- Lower quiescent current and cost-sensitive designs without complex power supply arrangements.
Choose STGAP2SICSNCTR when…
- Driving high-voltage MOSFETs or IGBTs requiring isolated gate drive up to ±1700 V output voltage.
- The application demands galvanic isolation with a 4800 Vpk rating for safety or noise immunity (e.g., industrial drives, inverters).
- High common-mode transient immunity (≥100 V/ns) is critical due to harsh EMI environments.
- High peak output current (up to 4 A sink) is necessary to drive large gate charge devices directly.
- System architecture includes separate isolated power rails and requires integrated Miller clamp and active gate voltage clamping for protection.