Diodes Incorporated 1SMB5916B-13

Overview

1SMB5916B-13 from Diodes Incorporated is a 3.0W surface-mount power Zener diode with a nominal zener voltage of 4.3V (min 4.08V, max 4.52V), ±5% tolerance, 87.2Ω dynamic impedance at 6mA test current, and 5µA maximum reverse leakage at 3.48V. It operates across –65°C to +150°C and is used for precision voltage regulation and overvoltage protection in DC power rails.

For engineers reviewing the 1SMB5916B-13 datasheet, 1SMB5916B-13 pinout, 1SMB5916B-13 application, or 1SMB5916B-13 equivalent, this device is selected for stable low-voltage reference generation, ESD-robust clamping in industrial sensors, and compact 3W-rated voltage stabilization where SMB package thermal performance and Class 3 HBM ESD (>16kV) are required.

Technical Context

This Zener diode functions as a two-terminal voltage reference and shunt regulator, maintaining a stable breakdown voltage under reverse bias. Its 4.3V nominal V_Z places it in the low-voltage Zener range optimized for 3.3V/5V system rail supervision and logic-level clamping.

Thermal design relies on its 226°C/W junction-to-ambient resistance (on FR-4 PCB) and 25°C/W junction-to-terminal resistance, enabling 3.0W dissipation at T_L = +75°C. The 1.5V forward voltage at 200mA supports bidirectional transient suppression when paired with series components.

Key Specifications

Pinout & Package

Package: SMB (Surface Mount B), molded plastic case per JEDEC DO-214AA, UL 94V-0 rated, 0.096g weight, cathode band polarity marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Compared with BZX84-C4V3 and SMBJ4.3A, the 1SMB5916B-13 uniquely balances precision regulation (±5% V_Z, low ZZT), high continuous power (3.0W), and robust ESD immunity-making it optimal for industrial DC rail supervision where both accuracy and ruggedness are mandatory.

Availability

1SMB5916B-13 is available at Aetrix Electronics and suitable for industrial sensor modules, programmable logic controller I/O cards, and USB-C power delivery subsystems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for 1SMB5916B-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for industrial, automotive, and computing markets.

The 1SMB59xxB series belongs to Diodes' power Zener portfolio, engineered for high-power surface-mount voltage regulation and transient suppression in space-constrained, thermally demanding applications.

FAQ

What is the maximum continuous power dissipation for 1SMB5916B-13 at +25°C ambient?

The device dissipates 550mW continuously at +25°C ambient temperature, derating linearly by 4.4mW/°C above that point. This value is defined by its 226°C/W junction-to-ambient thermal resistance on standard FR-4 PCB layout per AP02001.

How does the 1SMB5916B-13 differ from standard signal Zeners like the 1N4733A?

Unlike the 1N4733A (1W, DO-41), the 1SMB5916B-13 delivers 3.0W in an SMB package, features Class 3 ESD immunity (>16kV HBM), and uses copper alloy leadframe with matte tin plating for superior solderability and thermal transfer on automated assembly lines.

Can 1SMB5916B-13 be used in place of a 4.3V voltage reference IC?

No-it lacks the temperature stability, initial accuracy, and low drift of dedicated reference ICs (e.g., TL431). It serves best as a shunt regulator or clamp where ±5% tolerance and moderate tempco (see Fig. 2) are acceptable, not precision analog measurement.

What is the significance of the "B" suffix in 1SMB5916B-13?

The "B" denotes Diodes Incorporated's standard ±5% zener voltage tolerance grade. The "-13" suffix indicates 3,000-piece tape-and-reel packaging per JEDEC standard, compatible with high-speed pick-and-place equipment.