STMicroelectronics SPT02-236DDB

Overview

SPT02-236DDB from STMicroelectronics is a dual-diode transient voltage suppression array designed for 24 V proximity sensor power rail protection, providing reverse polarity blocking and overvoltage clamping. It features a minimum breakdown voltage of 38 V, 46 V max clamping at 2 A (8/20 µs), 1.1 V forward drop at 300 mA, -40 °C to +100 °C operating range, and µQFN-2L 0.8 mm flat package.

For engineers reviewing the SPT02-236DDB datasheet, SPT02-236DDB pinout, SPT02-236DDB application, or SPT02-236DDB equivalent, key selection criteria include IEC 61000-4-2/4-4/4-5 compliance, dual-diode functional separation (D1 for switch protection, D2 for reverse blocking), thermal performance under inductive demagnetization stress, and µQFN-2L footprint compatibility with high-density automation PCB layouts.

Technical Context

The SPT02-236DDB implements two functionally distinct diodes in a single µQFN-2L package: D1 serves as a clamping diode for inductive load demagnetization surge suppression on the power bus, while D2 acts as a series reverse-polarity blocking diode. Its design targets EN 60947-5-2–compliant sensor interfaces requiring simultaneous reverse voltage isolation and transient energy absorption.

Electrical behavior is defined by tightly coupled parameters: VBR ≥ 38 V ensures robust overvoltage thresholding; VCL ≤ 46 V at 2 A (8/20 µs) guarantees low-voltage clamping during surge events; VF ≤ 1.1 V at 300 mA minimizes forward conduction loss in the blocking path; and R_th(j-a) = 230 °C/W enables thermal management on standard FR4 boards.

Key Specifications

Pinout & Package

The SPT02-236DDB uses a µQFN-2L package with an exposed thermal pad and two terminals only - no internal bond wires or third connection. The package is lead-free, UL94 V0 compliant, and optimized for automated reflow assembly per J-STD-020D.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-diode transient and reverse polarity protection applications.

Compared with SM712-TR and TPD2E001DRYR, the SPT02-236DDB uniquely integrates both clamping and reverse-blocking functions in one package with validated 1 kV surge and 65 mJ inductive energy handling - enabling simpler, more reliable protection for 24 V industrial sensor power interfaces.

Availability

SPT02-236DDB is available at Aetrix Electronics and suitable for factory automation sensor interfaces, PLC digital input modules, industrial valve actuator drivers, and machine safety door switch protection requiring stable component supply and long-term lifecycle assurance.

Supply support for SPT02-236DDB 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The SPT series is ST's dedicated product line for sensor interface protection ICs, engineered specifically to meet EN 60947-5-2 and IEC 61131-2 requirements in factory automation systems - emphasizing compactness, dual-function integration, and long-term reliability under thermal and electrical stress.

FAQ

What is the maximum continuous forward current rating for the reverse-blocking diode (D2)?

The SPT02-236DDB D2 diode is rated for 300 mA peak forward current at T_j = 150 °C with 50% duty cycle. Its steady-state DC current capability is limited by thermal dissipation: at 100 °C ambient and 230 °C/W R_th(j-a), continuous operation above ~120 mA requires careful PCB copper area design to avoid exceeding 150 °C junction temperature.

Can the SPT02-236DDB be used on a 12 V system?

Yes, but with reduced margin: its 38 V minimum breakdown voltage is optimized for 24 V nominal systems. At 12 V, the clamping headroom remains sufficient for typical transients, but the 33 V reverse stand-off voltage (V_RM) means it may conduct slightly under sustained overvoltage conditions - verify system-level surge profiles before deployment.

How is thermal performance affected by the absence of a solder mask opening on the exposed pad?

Omitting the solder mask opening on the µQFN-2L exposed pad increases R_th(j-a) by ~30–40%, raising junction temperature under surge conditions. ST's recommended footprint includes a fully exposed pad with 50% stencil opening ratio - deviation risks exceeding 150 °C junction limit during repetitive 3 A pulses.

Does the SPT02-236DDB require external current-limiting resistors in series with D2?

No. The D2 reverse-blocking diode has no series resistor requirement: its 1.1 V forward drop at 300 mA and 3 A surge rating allow direct in-line placement between power source and sensor. External resistors would degrade voltage regulation and are unnecessary unless system-level current limiting is required for fault containment.