SL27517 Overview
The Slkor SL27517 is a single-channel 4A peak low-side gate driver IC engineered for high-speed, high-current MOSFET and IGBT switching in demanding power conversion applications. A standout feature of the SL27517 is its dual-input architecture — the device provides two input pins that can be configured to achieve either non-inverting or inverting output operation, with the unused input pin repurposed as an enable/disable control. This flexibility allows a single device to serve multiple circuit functions without additional logic gates, reducing component count and PCB area in designs where output polarity selection or hardware enable control is required. The SL27517 operates from a wide VDD supply of 4.5V to 20V (absolute maximum 24V), covering the full range of standard gate drive rails used with silicon MOSFETs, IGBTs, and enhancement-mode GaN FETs.
Slkor’s SL27517 delivers an exceptionally fast 6ns rise time and 6ns fall time — among the best in class for a 4A SOT-23-5 gate driver — enabling precise gate switching with minimal transition loss at high PWM frequencies. The symmetric 4A peak source and sink current ensures equally fast charge and discharge of the power switch gate capacitance, maintaining consistent switching waveforms on both turn-on and turn-off edges. Propagation delay is typically below 20ns, and the device supports negative input voltages down to -5V — a useful characteristic in applications where the input signal swings below ground due to inductive coupling or negative-referenced logic interfaces. An important failsafe behaviour is that the output defaults to low when the input pin is floating, preventing accidental MOSFET turn-on under open-circuit input fault conditions.
The SL27517 is compatible with TTL and CMOS logic levels directly from the microcontroller or DSP, and its integrated VDD undervoltage lockout (UVLO) holds the output low until the supply reaches its operating threshold, preventing partial gate enhancement during power-up. Operating across a wide temperature range of -40°C to 125°C, the SL27517 is housed in the compact SOT-23-5 package, footprint-compatible with the TI UCC27517 and equivalent single-channel low-side gate drivers. ABL Semi stocks the SL27517 as a fully authentic, original Slkor factory product, with flexible MOQ and compliance documentation for UK and European customers.
Key Specifications
| Parameter | Value |
|---|---|
| Device Type | Single-Channel Low-Side Gate Driver |
| Supply Voltage (VDD) — Recommended | 4.5V to 20V |
| Supply Voltage (VDD) — Absolute Maximum | 24V |
| Peak Source Output Current (IOH) | 4A |
| Peak Sink Output Current (IOL) | 4A |
| Rise Time (Tr) | 6ns |
| Fall Time (Tf) | 6ns |
| Propagation Delay (Typical) | <20ns |
| Input Architecture | Dual-input — configurable non-inverting or inverting; unused pin = enable/disable |
| Negative Input Capability | Down to -5V |
| Logic Input Compatibility | TTL and CMOS compatible |
| UVLO Protection | Integrated VDD undervoltage lockout |
| Floating Input Default | Output low |
| Operating Temperature Range | -40°C to +125°C |
| Package | SOT-23-5 |
Applications
The SL27517 is suited to single-channel low-side gate drive applications demanding high peak current, ultra-fast switching edges, and flexible input logic configuration. Primary application areas include synchronous buck and boost DC-DC converters, GaN FET gate drivers, high-frequency resonant converter low-side switches, BLDC motor drive low-side phases, and PFC boost stage gate control. The device is equally applicable in battery management system FET drivers, point-of-load converters, industrial switched-mode power supplies, and portable power tool inverter stages, where its 6ns edge speed, dual-input flexibility, and compact SOT-23-5 footprint deliver high-performance gate drive in minimal board space.
Pin-to-Pin Compatible Alternatives
The SL27517’s SOT-23-5 package, 4A symmetric drive capability, and single-channel non-inverting architecture are shared with the most widely used low-side gate drivers from TI and Microchip, enabling direct footprint substitution to reduce BOM cost and establish multi-source supply without PCB modification.
| Reference Part Number | Original Manufacturer | Why Choose SL27517 |
|---|---|---|
| UCC27517DBVR | Texas Instruments | Industry-standard 4A single-channel low-side gate driver in SOT-23-5; SL27517 is a direct pin-for-pin replacement with faster 6ns rise/fall times (vs TI’s 10ns) and the added benefit of a dual-input enable/disable function |
| MCP1407T-E/OT | Microchip | Single-channel 6A gate driver in SOT-23-5; SL27517 provides a 4A alternative with faster 6ns switching edges and dual-input configurability, at a lower unit cost from ABL Semi stock |
| TC4427AVOA | Microchip (Telcom) | Dual-channel 1.5A gate driver in SOT-23; SL27517 offers a single-channel 4A solution in the same SOT-23-5 footprint with significantly higher peak drive current for larger gate capacitances |
| IXD_604YVTR | IXYS (Littelfuse) | 4A single-channel gate driver in SOT-23; SL27517 provides equivalent drive current with the additional dual-input non-inverting/inverting configurability and negative input voltage tolerance not present in the IXYS device |
| ZXGD3009E6TA | Diodes Inc. | N-channel gate driver in SOT-23-6; SL27517 offers equivalent low-side drive in the more compact 5-pin SOT-23-5 format with faster 6ns edges and output-low failsafe on floating input |
Frequently Asked Questions
Is SL27517 RoHS compliant?
Yes. The SL27517 is fully RoHS compliant. Slkor manufactures the SL27517 in accordance with EU RoHS Directive 2011/65/EU, ensuring the device is free from restricted hazardous substances including lead and mercury. ABL Semi can provide full compliance and trade documentation upon request to support UK and European regulatory and procurement requirements.
What are the pin-to-pin replacements for SL27517?
The SL27517 is a direct pin-to-pin replacement for the Texas Instruments UCC27517DBVR and is footprint-compatible with the Microchip MCP1407T-E/OT, IXYS IXD_604YVTR, and Diodes Inc. ZXGD3009E6TA in the SOT-23-5 package — all sharing a single-channel low-side gate driver architecture. Refer to the compatibility table above for a detailed technical comparison.
What is the minimum order quantity (MOQ) for SL27517?
ABL Semi offers flexible MOQ for SL27517, supporting both prototype quantities and mass production orders. Contact us for current stock and pricing.
What package options are available for SL27517?
The SL27517 is available in the SOT-23-5 (5-pin small outline transistor) surface-mount package. This compact, industry-standard footprint is pin-compatible with the TI UCC27517DBVR and equivalent single-channel gate drivers from Microchip, IXYS, and Diodes Inc., ensuring direct board-level replacement in existing designs without any layout changes. Contact ABL Semi to confirm current stock availability.
How does the SL27517 dual-input design work, and how can the unused pin be used as an enable control?
The SL27517 features two independent input pins — IN+ and IN− — which determine output polarity and control behaviour. When the PWM signal is applied to IN+ with IN− tied low, the device operates in non-inverting mode (output follows IN+). When the PWM signal is applied to IN− with IN+ tied high, the device operates in inverting mode (output is the logical inverse of IN−). In either configuration, the unused input pin can be driven high or low by an external enable signal to enable or disable the gate drive output independently of the PWM signal — effectively providing hardware enable/disable control without an additional logic gate. This dual-input flexibility makes the SL27517 particularly useful in designs requiring configurable drive polarity or hardware shutdown capability within the SOT-23-5 footprint.
For complete product specifications, please refer to: