Vishay General Semiconductor - Diodes Division SMBZ5929B-M3/5B

Overview

SMBZ5929B-M3/5B from Vishay General Semiconductor is a surface-mount Zener voltage-regulating diode with nominal Zener voltage 15 V, maximum Zener impedance 600 Ω at 9 mA test current, and 550 mW power dissipation at 25 °C ambient - used for precision voltage reference and overvoltage protection in DC power rails.

For engineers reviewing the SMBZ5929B-M3/5B datasheet, SMBZ5929B-M3/5B pinout, SMBZ5929B-M3/5B application, or SMBZ5929B-M3/5B equivalent, key selection criteria include Zener voltage tolerance (±5 %), low regulation factor, thermal resistance (226 °C/W junction-to-ambient), and halogen-free RoHS-compliant SMB (DO-214AA) packaging suitable for automated SMT assembly.

Technical Context

This device operates as a single-element, silicon planar Zener diode optimized for stable reverse-bias voltage regulation. It delivers 15 V nominal regulation with ±5 % tolerance across 14.3–15.8 V range at 9 mA test current, and maintains low dynamic impedance (≤600 Ω) under specified DC and pulse conditions.

Designed for operation within -55 °C to +150 °C junction temperature range, it features 25 °C/W junction-to-lead thermal resistance and meets J-STD-020 MSL Level 1 (peak 260 °C), supporting reflow compatibility without moisture sensitivity concerns.

Key Specifications

Pinout & Package

Package: SMB (DO-214AA), surface-mount, low-profile plastic case with cathode band marking; matte tin-plated leads, RoHS-compliant and halogen-free (M3 suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C15-7-F and 1N5349B, SMBZ5929B-M3/5B uniquely balances SMT compatibility, 550 mW continuous dissipation, and 600 Ω low-impedance regulation in the compact SMB footprint - making it optimal for mid-power industrial and automotive PCBs where thermal margin and automated placement coexist.

Availability

SMBZ5929B-M3/5B is available at Aetrix Electronics and suitable for industrial power monitoring, automotive ECU reference design, and telecom line card protection requiring stable component supply and halogen-free compliance.

Supply support for SMBZ5929B-M3/5B 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 General Semiconductor is a global supplier of discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on reliability and application-specific performance.

The SMBZ59xxB series is part of Vishay's surface-mount Zener regulator family engineered for high-stability voltage reference and robust overvoltage protection in space-constrained, thermally demanding environments.

FAQ

What is the Zener voltage tolerance of SMBZ5929B-M3/5B?

The SMBZ5929B-M3/5B has a Zener voltage tolerance of ±5 %, with a specified range of 14.3 V to 15.8 V at 9 mA test current (I_ZT). This tolerance is guaranteed over the full operating temperature range (-55 °C to +150 °C) and reflects the device's precision as a shunt voltage reference. The nominal value is 15.0 V, and the SMBZ5929B-M3/5B datasheet confirms this specification applies to all units bearing the M3/5B suffix.

Does SMBZ5929B-M3/5B support lead-free reflow soldering?

Yes, SMBZ5929B-M3/5B meets J-STD-020 Moisture Sensitivity Level 1 and is qualified for peak reflow temperatures up to 260 °C, fully compatible with standard Pb-free soldering processes. Its M3 suffix denotes halogen-free, RoHS-compliant construction with matte tin-plated leads that satisfy J-STD-002 and JESD22-B102 solderability requirements - no pre-baking is needed prior to reflow.

What is the maximum steady-state power dissipation for SMBZ5929B-M3/5B at 75 °C lead temperature?

The SMBZ5929B-M3/5B supports 3000 mW maximum steady-state power dissipation when mounted on minimum recommended pad layout with lead temperature (T_L) held at 75 °C. This rating is significantly higher than its 550 mW ambient-rated dissipation (at T_A = 25 °C), reflecting its capability to handle short-duration pulses or enhanced thermal management via PCB copper planes - critical for surge protection applications.

How does SMBZ5929B-M3/5B compare to SMBZ5928B in terms of Zener voltage and test current?

SMBZ5929B-M3/5B has a nominal Zener voltage of 15.0 V at 9.0 mA test current (I_ZT), whereas SMBZ5928B is rated at 13.0 V nominal with 7.0 mA I_ZT. Both share identical SMB (DO-214AA) packaging, thermal characteristics, and M3 halogen-free compliance. The SMBZ5929B-M3/5B offers higher regulation voltage suited for 12–15 V system rails, while maintaining comparable Zener impedance (600 Ω vs. 550 Ω) and leakage (<1 μA).

Is SMBZ5929B-M3/5B suitable for use as a voltage reference in precision analog circuits?

SMBZ5929B-M3/5B can serve as a cost-effective voltage reference in non-critical analog circuits, but lacks the temperature coefficient stability and long-term drift performance of bandgap or buried-Zener references. Its typical temperature coefficient is +5.5 mV/°C near 15 V, and regulation accuracy depends on stable bias current. For SMBZ5929B-M3/5B, use is appropriate in comparator thresholds or coarse ADC references where ±5 % initial tolerance and moderate thermal drift are acceptable.