Vishay General Semiconductor - Diodes Division SMPZ3929B-M3/84A

Overview

SMPZ3929B-M3/84A from Vishay General Semiconductor is a surface-mount Zener diode with nominal Zener voltage of 15 V, 100 mA maximum DC Zener current, and 1500 mW power dissipation at TL = 75 °C in the SMP (DO-220AA) package. It delivers low Zener impedance (600 Ω max at IZT), low regulation factor, and operates across -65 °C to +150 °C junction temperature for precision voltage regulation in compact power supply rails.

For engineers reviewing the SMPZ3929B-M3/84A datasheet, SMPZ3929B-M3/84A pinout, SMPZ3929B-M3/84A application, or SMPZ3929B-M3/84A equivalent, key selection criteria include its 15 V regulation tolerance (±5.3 %), MSL level 1 moisture sensitivity, 1.0 mm profile for space-constrained PCBs, and matte tin-plated leads compliant with J-STD-002 solderability standards.

Technical Context

This device functions as a single-element, cathode-banded Zener regulator optimized for stable DC voltage reference and overvoltage protection. Its electrical behavior is defined by reverse breakdown at 14.3–15.8 V under 9.0 mA test current, with dynamic impedance tightly controlled to ≤600 Ω at IZT and ≤600 Ω at IZK (0.25 mA).

Thermal performance relies on low thermal resistance: 50 °C/W junction-to-lead and 250 °C/W junction-to-ambient (on 5.0 mm × 5.0 mm copper pads). The SMP (DO-220AA) package enables automated placement while maintaining UL 94 V-0 flammability rating and halogen-free, RoHS-compliant construction.

Key Specifications

Pinout & Package

Two-terminal device in SMP (DO-220AA) package: anode and cathode terminals identified by color band at cathode end. Matte tin-plated leads meet J-STD-002 solderability and JESD 201 class 1A whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C15LT1G and 1N4744A, SMPZ3929B-M3/84A uniquely combines high-power SMT capability (1500 mW at 75 °C), ultra-low profile (1.0 mm), and MSL level 1 compatibility-making it the only choice for volume-manufactured, thermally demanding, and space-limited 15 V regulation tasks.

Availability

SMPZ3929B-M3/84A is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU reference voltage generation, and consumer device overvoltage protection requiring stable component supply and full traceability.

Supply support for SMPZ3929B-M3/84A 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 leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on reliability and ruggedized performance.

The SMPZ39XB series is designed specifically for high-density, high-reliability voltage regulation and transient suppression in modern SMT power systems-targeting applications where low profile, thermal robustness, and process compatibility are critical.

FAQ

What is the exact Zener voltage tolerance of SMPZ3929B-M3/84A at 9.0 mA test current?

The SMPZ3929B-M3/84A has a guaranteed Zener voltage range of 14.3 V (minimum) to 15.8 V (maximum) at I_ZT = 9.0 mA, corresponding to a ±5.3 % tolerance around the 15 V nominal value. This specification is measured under standard conditions (T_A = 25 °C) and is validated per Vishay Document Number 88482, Revision 25-Apr-2022. The SMPZ3929B-M3/84A maintains this tolerance across its qualified operating temperature range.

Does SMPZ3929B-M3/84A support lead-free reflow soldering per industry standards?

Yes, SMPZ3929B-M3/84A is qualified for lead-free reflow soldering with a maximum peak temperature of 260 °C for 10 seconds at the terminals, meeting J-STD-020 MSL level 1 requirements. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and the M3 suffix confirms JESD 201 class 1A whisker resistance. The SMPZ3929B-M3/84A is fully compatible with standard Pb-free SMT assembly processes.

What is the thermal resistance from junction to ambient for SMPZ3929B-M3/84A, and under what conditions is it specified?

The typical junction-to-ambient thermal resistance (R_θJA) for SMPZ3929B-M3/84A is 250 °C/W, measured under the condition of mounting on a PCB with 5.0 mm × 5.0 mm copper pad areas attached to each terminal (per Note 1 in Vishay Document 88482). This value assumes natural convection and is used to calculate steady-state junction temperature rise under continuous DC power dissipation. The SMPZ3929B-M3/84A also achieves 50 °C/W R_θJL for improved thermal transfer to the PCB.

Can SMPZ3929B-M3/84A be used as a direct replacement for older through-hole Zeners like 1N4744A in new designs?

No, SMPZ3929B-M3/84A is not a direct replacement for 1N4744A due to fundamental differences in package (SMP/DO-220AA vs. DO-41), thermal design (1500 mW at T_L = 75 °C vs. 1 W at T_A = 50 °C), and assembly method (reflow-only vs. wave/hand-solder). While both regulate near 15 V, the SMPZ3929B-M3/84A requires redesigned PCB footprints and thermal pads. The SMPZ3929B-M3/84A is intended for new high-density SMT applications-not drop-in upgrades.

What is the maximum reverse leakage current for SMPZ3929B-M3/84A, and at what voltage is it specified?

The maximum reverse leakage current (I_R) for SMPZ3929B-M3/84A is 0.5 μA, specified at V_R = 11.4 V (80 % of nominal V_Z). This parameter is confirmed in the Electrical Characteristics table of Vishay Document 88482 and reflects the device's ability to maintain minimal standby current in high-impedance bias networks. The SMPZ3929B-M3/84A exhibits this ultra-low leakage across its full operating temperature range (-65 °C to +150 °C).