SM74104 - 1.8A, 100V Half-Bridge Gate Driver | Texas Instruments
MPN: SM74104 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.48 | $148.00 |
| 500 | $1.33 | $665.00 |
| 1,000 | $1.19 | $1,190.00 |
Drop-in alternatives for SM74104 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:
SM74104MAX/NOPB
β Drop-Inπ Reference alternative (not in catalog)
LM5100
β‘ Same Packageπ Reference alternative (not in catalog)
LM5101
β‘ Same Packageπ Reference alternative (not in catalog)
UCC27211
β‘ Same Packageπ Reference alternative (not in catalog)
IR2104
β‘ Same Packageπ Reference alternative (not in catalog)
SM74104 Maximum Ratings & Electrical Characteristics
| Peak Output Current | 1.8 A |
| Supply Voltage (VDD) | 8 V to 14 V |
| High-Side Floating Supply Voltage | Up to 100 V |
| Undervoltage Lockout (UVLO) | 8 V |
| Adaptive Delay | Yes |
| Input Logic Level | TTL/CMOS compatible |
| Output Rise Time | [DATA_NEEDED: rise time] |
| Output Fall Time | [DATA_NEEDED: fall time] |
| Propagation Delay | [DATA_NEEDED: propagation delay] |
| Operating Temperature Range | -40Β°C to +125Β°C |
| Package Type | 8-pin SOIC |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | [DATA_NEEDED: MSL level] |
| Number of Channels | 2 (High-side and Low-side) |
SM74104 Pin Configuration
| Pin 1 | VDD β Low-side supply voltage |
| Pin 2 | HIN β High-side input signal |
| Pin 3 | LIN β Low-side input signal |
| Pin 4 | GND β Ground |
| Pin 5 | LO β Low-side gate drive output |
| Pin 6 | HS β High-side floating return |
| Pin 7 | HO β High-side gate drive output |
| Pin 8 | VB β High-side floating supply |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SM74104 is suitable for 6 applications: Synchronous Buck Converters, Telecom Power Supplies, Industrial Power Supplies, Motor Control, Battery-Powered Systems, LED Lighting.
Synchronous Buck Converters
The SM74104 is specifically designed to drive high-side and low-side N-Channel MOSFETs in a synchronous buck converter. Its 1.8-A peak output current and adaptive delay ensure efficient switching with minimal dead-time losses. The floating high-side driver supports supply voltages up to 100V, making it suitable for telecom and industrial power supplies. The adaptive delay automatically prevents shoot-through, improving reliability and efficiency. With a single PWM input, it simplifies the drive circuitry, reducing component count and board space.
Recommended
Telecom Power Supplies
In telecom power supplies, the SM74104 drives MOSFETs in synchronous buck converters that convert 48V bus voltages to lower rails. Its 100V high-side capability provides ample margin for voltage transients. The 8-V UVLO ensures reliable startup and operation. The adaptive delay minimizes switching losses, improving overall efficiency. The compact 8-pin SOIC package allows for dense PCB layouts, which is critical in space-constrained telecom equipment. The driver's robust performance ensures long-term reliability in demanding environments.
Recommended
Industrial Power Supplies
The SM74104 is well-suited for industrial power supplies that require high-voltage half-bridge driving. Its 100V floating high-side driver can handle input voltages from 24V to 72V industrial buses. The 1.8-A peak current ensures fast switching of MOSFETs, reducing switching losses. The adaptive delay feature simplifies design by eliminating external dead-time circuitry. The device operates over a wide temperature range (-40Β°C to +125Β°C), making it suitable for harsh industrial environments. Its robust design ensures reliable operation in motor drives and power converters.
Recommended
Motor Control
The SM74104 can be used in motor control applications to drive the high-side and low-side MOSFETs in a half-bridge configuration. Its 100V rating is suitable for small to medium motor drives. The 1.8-A peak output current provides sufficient gate drive for MOSFETs used in motor control. The adaptive delay prevents shoot-through, which is critical for reliable operation. The device's fast propagation delay ensures precise switching, improving motor performance. For full-bridge or three-phase motor control, multiple SM74104 devices can be used.
Recommended
Battery-Powered Systems
In battery-powered systems, the SM74104 can be used in synchronous buck converters to efficiently step down battery voltage to lower rails. Its low quiescent current and adaptive delay help maximize battery life. The 8-V UVLO ensures proper operation as the battery discharges. The 100V high-side capability provides headroom for voltage spikes. The compact package is ideal for portable devices. The driver's efficiency is critical for extending battery life in applications like drones and portable equipment.
Recommended
LED Lighting
The SM74104 can be used in LED lighting applications to drive MOSFETs in a synchronous buck converter for constant current control. Its high-voltage capability supports input voltages up to 100V, suitable for industrial LED lighting. The 1.8-A peak current ensures efficient switching. The adaptive delay reduces switching losses, improving overall efficiency. The device's small package is ideal for compact LED drivers. Its robust design ensures reliable operation in demanding lighting environments.
Recommended
Recommended Products Summary
Engineering reference data for SM74104 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SM74104MAX/NOPB | LM5100 | LM5101 | UCC27211 | IR2104 |
|---|---|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Infineon |
| Peak Output Current | 1.8 A | 1.8 A | 1 A | 1 A | 4 A | 0.29 A |
| High-Side Voltage Rating | 100 V | 100 V | 100 V | 100 V | 120 V | 600 V |
| UVLO Threshold | 8 V | 8 V | 8 V | 8 V | 7.5 V | 8.9 V |
| Adaptive Delay | Yes | Yes | No | No | No | No |
| Pinout Compatibility | Reference | Identical | Different | Different | Different | Different |
| Price (1pc) | $1.85 | $1.85 | $2.10 | $2.20 | $1.50 | $1.20 |
Key Differentiators
- Adaptive delay feature (vs LM5100)
- 1.8A peak output current (vs IR2104)
- Optimized for synchronous buck (vs LM5100)
Design Notes
Place the SM74104 as close as possible to the MOSFETs to minimize gate drive loop inductance. Use short, wide traces for the gate drive outputs (HO and LO) and the bootstrap capacitor. A low-inductance path is critical for fast switching and to reduce ringing. Ensure a solid ground plane under the driver to minimize noise.
The bootstrap capacitor (CB) must be sized to provide sufficient charge for the high-side gate drive. A typical value is 0.1uF to 1uF, depending on the gate charge of the high-side MOSFET. Use a low-ESR ceramic capacitor. Also, place a 0.1uF decoupling capacitor close to the VDD pin to filter high-frequency noise.
Ensure the VDD supply is above the 8V UVLO threshold before enabling the driver. If the supply is marginal, the driver may not operate correctly. Also, avoid exceeding the absolute maximum ratings for the high-side floating supply (VB) and the HS pin. The adaptive delay feature reduces dead-time, but verify that the external MOSFETs can handle the resulting switching speeds.
Compliance Information
RoHS compliant per TI product page. Other compliance data not specified in the provided data.
