Vishay Siliconix SI9986DY-T1-E3

Overview

SI9986DY-T1-E3 from Vishay Siliconix is a buffered H-bridge motor driver IC designed for bidirectional control of brushed DC motors, stepper motors, and actuators. It integrates complementary N-channel and P-channel output FETs, built-in shoot-through protection, 3.8–13.2 V operating range, CMOS-level inputs, and supports up to 200 kHz PWM switching - enabling dynamic braking and high-impedance open-state operation in PC-based 5 V/12 V systems.

For engineers reviewing the SI9986DY-T1-E3 datasheet, SI9986DY-T1-E3 pinout, SI9986DY-T1-E3 application, or SI9986DY-T1-E3 equivalent, key selection considerations include its integrated shoot-through logic, complementary FET topology eliminating external high-side bias, four-state control (forward/reverse/brake/HiZ), and suitability for closed-loop voltage or current feedback motor control architectures.

Technical Context

The SI9986DY-T1-E3 implements an integrated dual-channel gate driver with on-chip shoot-through prevention logic that actively disables both upper and lower FETs on the same half-bridge leg simultaneously. Its complementary output stage uses N-channel (low-side) and P-channel (high-side) MOSFETs, removing the need for external charge pumps or floating supplies.

Control is implemented via two CMOS-compatible digital inputs (INA, INB), defining four discrete output states: forward (OUTA=VDD, OUTB=GND), reverse (OUTA=GND, OUTB=VDD), brake (both outputs shorted to GND), and high-impedance (both outputs floating except through internal flywheel diodes). Input switching supports up to 200 kHz for precise PWM duty-cycle modulation.

Key Specifications

Pinout & Package

SI9986DY-T1-E3 is housed in an 8-pin SOIC package (SO-8, 150 mil width) with exposed thermal pad (EP). Pin 1 is marked by a dot or notch; device orientation follows standard SOIC conventions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar H-bridge motor driver applications.

Compared with TB6612FNG and DRV8870, the SI9986DY-T1-E3 offers unique integration of shoot-through prevention and complementary FETs in a single SO-8 package, making it optimal for space-constrained 5–12 V brushed motor systems where simplicity, reliability, and dynamic braking are prioritized over peak current or wide-VDD range.

Availability

SI9986DY-T1-E3 is available at Aetrix Electronics and suitable for brushed DC motor control, stepper motor phase drivers, actuator positioning systems, and industrial feedback-controlled drives requiring stable component supply and long-term production continuity.

Supply support for SI9986DY-T1-E3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay Siliconix is a global leader in discrete semiconductors, specializing in MOSFETs, diodes, optoelectronics, and precision resistive components with emphasis on power efficiency and reliability.

The SI9986DY-T1-E3 belongs to Vishay's buffered power driver product line, engineered specifically for compact, low-voltage motor control applications where integration, shoot-through immunity, and ease of use supersede raw current rating.

FAQ

What is the maximum continuous output current supported by the SI9986DY-T1-E3?

The SI9986DY-T1-E3 supports 1.5 A continuous output current per channel under typical PCB thermal conditions (2-layer board, 1 in² copper pour). Peak current capability reaches 2.5 A for <100 µs pulses. Actual current depends on ambient temperature, PCB copper area, and airflow - derating is required above 70°C case temperature. The SI9986DY-T1-E3 datasheet specifies R_DS(on) of 0.25 Ω (P-ch) and 0.18 Ω (N-ch) at V_GS = 5 V, enabling efficient operation at 5 V logic levels.

Does the SI9986DY-T1-E3 require external flyback diodes for inductive loads?

No, the SI9986DY-T1-E3 includes integrated body diodes in its complementary N+P FET structure that serve as functional flyback paths during inductive flyback events in all four output states. External diodes are unnecessary for standard brushed motor or solenoid loads. However, a snubber network (RC) may be added across the load terminals if EMI or voltage overshoot exceeds system requirements - as noted in AN720 application note for noisy environments.

How does the shoot-through protection logic work in the SI9986DY-T1-E3?

The SI9986DY-T1-E3 implements hardware-level shoot-through prevention by detecting simultaneous high logic on INA and INB (state 3) or invalid transitions, then inserting a dead-time delay before enabling either output FET. This logic is fully internal and asynchronous - no external timing components or microcontroller intervention is needed. The SI9986DY-T1-E3 ensures that the high-side and low-side FETs on the same leg never conduct concurrently, preventing destructive shoot-through current even during rapid input transitions.

Can the SI9986DY-T1-E3 operate from a 3.3 V logic supply?

No, the SI9986DY-T1-E3 requires a minimum VDD of 3.8 V for guaranteed operation, and its CMOS inputs are referenced to VDD, not a separate logic supply. While INA and INB accept 3.3 V logic-high signals when VDD ≥ 4.5 V (per input threshold specs), the device itself cannot be powered from 3.3 V. For 3.3 V system compatibility, interface via level-shifting buffers or select a 3.3 V–compatible H-bridge such as the DRV8837 - the SI9986DY-T1-E3 is optimized for 5 V/12 V PC and industrial supply rails.

What thermal management guidance applies to the SI9986DY-T1-E3 in SO-8 package?

The SI9986DY-T1-E3 SO-8 package features an exposed thermal pad (EP) that must be soldered to a minimum 1 in² copper pour tied to GND for effective heat dissipation. Thermal resistance θ_JA is 65°C/W with 2-layer board and 1 in² copper; adding thermal vias under the EP reduces θ_JA to ~45°C/W. Junction temperature must stay below 150°C - at 1.5 A continuous and 12 V supply, board-level thermal design is critical. The SI9986DY-T1-E3 includes thermal shutdown but relies on proper PCB layout for sustained operation.