Diodes Incorporated 1SMB5928B-13

Overview

1SMB5928B-13 from Diodes Incorporated is a 3.0W surface-mount power Zener diode with nominal zener voltage 13.0V (±5%), zener impedance 28.8Ω at 7mA test current, maximum reverse current 0.25µA at 9.9V, and ESD rating >16kV (HBM). It operates from –65°C to +150°C and is used for precision voltage regulation and overvoltage protection in DC power rails of industrial control modules.

For engineers reviewing the 1SMB5928B-13 datasheet, 1SMB5928B-13 pinout, 1SMB5928B-13 application, or 1SMB5928B-13 equivalent, key selection criteria include zener voltage tolerance, dynamic impedance at rated test current, thermal resistance (R_θJA = 226°C/W), and SMB package compatibility with automated SMT assembly.

Technical Context

This Zener diode functions as a two-terminal voltage reference and clamping device, maintaining stable reverse breakdown across its specified operating temperature range. Its 3.0W power dissipation rating applies at T_L = +75°C with derating above that point, and it exhibits a typical temperature coefficient near +4.5 mV/°C for the 13V grade.

The device uses a planar silicon junction structure housed in an SMB molded plastic case with cathode band polarity marking. Its low leakage (≤0.25 µA at 9.9V) and tight V_Z tolerance support reliable regulation in low-power analog sensing and supply monitoring circuits.

Key Specifications

Pinout & Package

Package: SMB (Surface Mount Small Outline), molded plastic case with UL 94V-0 flammability rating, cathode band marking, and matte tin-plated copper alloy leadframe. Dimensions: 3.30–3.94 mm (L) × 4.06–4.57 mm (W) × 1.96–2.21 mm (H).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5349B and BZX84-C13, the 1SMB5928B-13 uniquely balances SMT manufacturability, 3.0W capability, and SMB footprint-making it optimal for production-grade 12V/13V rail protection where thermal design margin and assembly automation are critical.

Availability

1SMB5928B-13 is available at Aetrix Electronics and suitable for industrial power supply monitoring, automotive body control module voltage clamp, and medical sensor signal conditioning requiring stable component supply and full RoHS 3 compliance.

Supply support for 1SMB5928B-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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with design and manufacturing operations across Asia, Europe, and the Americas.

The SMB-series Zener diodes are engineered for high-reliability surface-mount voltage regulation and transient suppression in automotive, industrial, and computing applications where power density and process compatibility are essential.

FAQ

What is the maximum steady-state power dissipation for 1SMB5928B-13 at +25°C ambient?

At T_A = +25°C, the maximum power dissipation is 550mW, derating linearly at 4.4mW/°C above that temperature. This limit reflects junction-to-ambient thermal resistance (226°C/W) on standard FR-4 PCBs without forced airflow or heatsinking.

Does 1SMB5928B-13 require a series current-limiting resistor in shunt regulation applications?

Yes - a series resistor is mandatory to limit zener current below I_ZM = 550mA and prevent thermal runaway. For 12V input regulation, a 10Ω/1W resistor sets I_Z ≈ 100mA, keeping power within safe margins while maintaining regulation accuracy.

How does the temperature coefficient affect regulation accuracy over –40°C to +85°C?

For the 13V grade, the typical temperature coefficient is +4.5 mV/°C. Over a 125°C span, this introduces ±563mV drift - approximately ±4.3% of nominal V_Z. Applications requiring tighter stability must compensate via circuit design or select tighter-tolerance grades.

Can 1SMB5928B-13 be used in parallel for higher power handling?

No - Zener diodes exhibit negative temperature coefficients and mismatched V_Z tolerances, causing current hogging and thermal instability when paralleled. For higher power, use a single higher-rated device or active regulation instead.