MCP1402T-E/OT vs STGAP2SICSTR Gate Driver ICs: A Detailed Comparison
Quick verdict
For simple low-side MOSFET/IGBT drive without isolation and limited board space, the MCP1402T-E/OT is the more straightforward and compact choice, offering clean, fast drive up to 500mA peak current. For applications requiring galvanic isolation, high transient immunity, and significantly higher drive current (4A peak), especially in half-bridge or isolated gate drive configurations, the STGAP2SICSTR is the clear winner despite a larger footprint and more complex supply requirements.
Spec comparison table
| Spec | MCP1402T-E/OT | STGAP2SICSTR | Notes |
|---|---|---|---|
| Channel type | Single | Single | Both single-channel devices. |
| Current peak output source/sink | 500mA / 500mA | 4A / 4A | ST device offers 8x higher peak current, critical for driving large MOSFET gates fast. |
| Driven configuration | Low-Side | Not explicitly stated (isolated gate driver) | MCP1402T-E/OT explicitly low-side, ST is isolated driver suitable for high/low side. |
| Gate type | IGBT, MOSFET (N/P-Channel) | MOSFET (N-Channel implied) | MCP1402T-E/OT supports both IGBT and MOSFET; ST focuses on MOSFETs. |
| Input type | Non-inverting | TTL/CMOS with hysteresis | ST input has hysteresis improving noise immunity; MCP1402T-E/OT no hysteresis. |
| Logic voltage V_IL / V_IH | 0.8V / 2.4V | 0.29·VDD to 0.37·VDD / 0.62·VDD to 0.70·VDD | ST’s input thresholds scale with VDD and are tighter, better for 3.3/5V logic. |
| Supply voltage range | 4.5V to 18V | Logic supply 3V ~ 5.5V, Positive supply ~14.6V to 16.4V | MCP covers wider supply range; ST requires dual supplies (logic + high voltage). |
| Operating temperature range | -40°C to 150°C | -40°C to 125°C | MCP1402T-E/OT supports higher max temp, useful in harsher environments. |
| Package / case | SOT-23-5 (SC-74A, SOT-753) | 8-SOIC (7.5mm width) | MCP1402T-E/OT is compact SOT-23; ST is larger SOIC-8. |
| Rise / fall time typical | 19ns / 15ns | 30ns / 30ns | MCP is faster switching, beneficial for tight timing and less switching loss. |
| Propagation delay (max) | Not specified | 90ns (TPLH and TPHL) | MCP likely lower delay given rise/fall times but not specified; ST delay is significant. |
| Pulse width distortion max | Not specified | 20ns | ST includes this spec, indicating some timing distortion to account for. |
| Common mode transient immunity | Not specified | 100 V/ns | ST designed for high CMTI, important in noisy isolated environments. |
| Isolation voltage | None | 5000Vrms (galvanic isolation) | ST provides galvanic isolation, a key differentiator. |
| Supply current (typical) | Not specified | 1.3 mA quiescent, 1.8 mA active; standby 55-550 µA | ST’s quiescent currents are low for isolation drivers but higher than small MCP parts. |
| Safe clamp voltage | Not specified | 2.3V | ST includes safe clamp feature controlling gate voltage undershoot. |
| Maximum switching frequency | Not specified | 1 MHz | ST explicitly supports up to 1 MHz switching frequency. |
| Output voltage max (driver output) | Up to supply voltage (max 18V) | VH+0.3V (max ~16.7V) | MCP can run up to 18V, ST limited to about 16.4V supply max. |
| Thermal resistance junction-to-ambient | Not specified | 120 °C/W (typ) | ST’s thermal resistance is moderate; MCP data not specified but smaller package likely higher. |
| Storage temperature range | -40°C to 150°C | -40°C to 150°C | Equivalent storage temperature range. |
| Human body model ESD protection | Not specified | 2 kV | ST gives ESD rating; MCP data not listed. |
| Mounting type | Surface mount | Surface mount | Both SMT devices. |
| Number of drivers | 1 | 1 | Single channel each. |
| Package pin count | 5 pins | 8 pins | ST pin count higher due to isolation and more complex supply/return paths. |
| Logic input bias current | Not specified | 33 µA min | ST’s input bias current is moderate, influenced by isolation circuitry. |
Design trade-offs
Drive current and switching speed: The MCP1402T-E/OT provides 500mA peak source/sink current, sufficient for low to moderate gate charge MOSFETs or IGBTs in low-side configurations. Its rise/fall times of ~15–19ns support efficient switching with minimal losses. The STGAP2SICSTR, by contrast, can source and sink up to 4A peak, making it suitable for driving large MOSFETs with high gate charge or in half-bridge topologies requiring fast transitions to reduce switching losses. However, its rise/fall times are slower (30ns typical), partly due to the isolation barrier and internal coupling technology.
Isolation and noise immunity: The most significant functional difference is that the STGAP2SICSTR provides galvanic isolation rated at 5000Vrms, with a common-mode transient immunity (CMTI) of 100 V/ns. This makes it suitable for applications where the driver must be referenced to a floating or high-voltage domain, such as isolated half-bridge or motor drives. The MCP1402T-E/OT has no isolation, limiting it to low-side or non-isolated gate drive. The ST’s isolation dramatically increases design complexity (extra supply rails, layout constraints) but is mandatory in many industrial and automotive applications.
Supply voltage and power considerations: The MCP1402T-E/OT supports a wide supply range from 4.5V to 18V, allowing flexible use with different gate voltages and simpler power supply requirements. The ST device requires separate logic and high-voltage supplies (logic supply 3–5.5V, high-voltage supply nominally ~15.5V), adding BOM cost and complexity. ST’s quiescent currents (1.3–1.8mA active, 40–550µA standby) are reasonable but higher than typical non-isolated drivers, impacting efficiency in low-power standby modes.
Package and PCB layout: The MCP1402T-E/OT is a small 5-pin SOT-23-5 package, ideal for space-constrained designs and simple low-side drivers. The STGAP2SICSTR comes in an 8-pin SOIC, larger in footprint and with additional pins for isolation and supply, requiring more PCB area and careful layout. The ST datasheet provides detailed layout guidelines critical to maintain isolation integrity and minimize noise coupling. The MCP part is simpler to place and route, especially in dense boards.
Thermal and environmental: MCP1402T-E/OT supports operation up to 150°C junction temperature, useful in harsh environments or thermally constrained designs. STGAP2SICSTR max operating junction temperature is 125°C, which is typical for isolated drivers but more limited than MCP’s rating. Thermal resistance data are only available for ST (120°C/W typical), indicating moderate heat dissipation; MCP data is absent but smaller package likely has higher thermal resistance, requiring careful thermal management at high current.
Use-case fit
Choose MCP1402T-E/OT when:
- You need a compact, low-cost non-isolated low-side driver for N- or P-channel MOSFETs or IGBTs.
- Your gate drive current demand is modest (≤500mA peak), typical for small to medium MOSFETs in low-voltage DC-DC converters or simple motor drives.
- You want a wide supply voltage range (4.5–18V) to directly match gate voltage requirements without external regulators.
- PCB space is limited and you require a small 5-pin SOT-23 package.
- Your system does not require galvanic isolation or high common-mode transient immunity.
Choose STGAP2SICSTR when:
- You require galvanic isolation of up to 5000Vrms to break ground loops or protect low-voltage control circuitry.
- Driving large MOSFETs or IGBTs with gate charge demanding up to 4A peak current for fast switching.
- Your application involves half-