Vishay General Semiconductor - Diodes Division BZG03C12TR3

Overview

BZG03C12TR3 from Vishay Semiconductors is a 12 V, 3 W glass-passivated Zener diode in DO-214AC (SMA) package, designed for precision voltage regulation and transient overvoltage clamping in power supply rails and signal conditioning circuits. It delivers ±5% Zener voltage tolerance at 50 mA test current, 4 Ω typical dynamic resistance, and supports non-repetitive surge power up to 600 W for 100 µs pulses.

For engineers reviewing the BZG03C12TR3 datasheet, BZG03C12TR3 pinout, BZG03C12TR3 application, or BZG03C12TR3 equivalent, key selection criteria include its 12 V nominal Zener voltage, 3 W steady-state power rating at 100 °C ambient, 150 °C maximum junction temperature, and RoHS-compliant lead-free construction suitable for wave and reflow soldering.

Technical Context

The BZG03C12TR3 operates as a two-terminal voltage reference device with sharp reverse breakdown characteristics. Its glass-passivated junction ensures stable Zener voltage over time and temperature, while its DO-214AC package provides mechanical robustness and thermal performance compatible with standard 5 mm SMD footpads.

Thermal resistance from junction-to-ambient is 125 K/W when mounted on epoxy-glass hard tissue (Fig. 1b), and junction-to-lead resistance is 25 K/W - enabling effective heat dissipation in compact PCB layouts without heatsinking for moderate-duty applications.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, molded plastic case with cathode band marking; dimensions per Vishay Doc. 85593 Rev. 1.7 - length 4.3 mm, width 2.6 mm, height 2.1 mm; weight ≈ 77 mg.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZG03C12TR3, the BZT52-C12 offers smaller size but lacks 3 W power handling and SMD compatibility, while the 1N4742A trades surge robustness and modern compliance for broad availability in legacy systems - making BZG03C12TR3 optimal for new SMD designs needing reliable 12 V clamping at elevated power levels.

Availability

BZG03C12TR3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, consumer SMPS feedback networks, and medical instrument protection circuits requiring stable component supply with full traceability and lifecycle management.

Supply support for BZG03C12TR3 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial, automotive, and computing applications.

The BZG03C-Series was developed for surface-mount voltage regulation and transient suppression in compact, high-density PCBs - emphasizing thermal robustness, solderability, and long-term parametric stability in harsh environments.

FAQ

What is the Zener voltage tolerance of the BZG03C12TR3?

The BZG03C12TR3 has a Zener voltage range of 11.4 V (min) to 12.7 V (max) at 50 mA test current, corresponding to ±5.8% total tolerance. This specification is verified per Vishay Document Number 85593 Rev. 1.7 and applies under standard 25 °C ambient conditions. The BZG03C12TR3 maintains this tolerance across its rated operating temperature range when used within thermal limits.

Can the BZG03C12TR3 be used in reflow soldering processes?

Yes, the BZG03C12TR3 is explicitly qualified for both wave and reflow soldering per its datasheet. Its glass-passivated junction and DO-214AC package withstand standard Pb-free reflow profiles (peak ~260 °C). No pre-baking is required, and the BZG03C12TR3 remains fully functional after JEDEC J-STD-020-compliant thermal cycling - critical for high-yield SMT manufacturing.

What is the maximum non-repetitive surge power the BZG03C12TR3 can handle?

The BZG03C12TR3 supports up to 600 W of non-repetitive surge power for pulse widths of 100 µs at 25 °C junction temperature, as defined in its Absolute Maximum Ratings table. This capability allows the BZG03C12TR3 to clamp fast transients such as ESD events or inductive switch-off spikes without degradation, provided pulse repetition is sufficiently low to avoid cumulative thermal stress.

How does the thermal resistance of the BZG03C12TR3 vary with PCB mounting?

The BZG03C12TR3 exhibits R_thJA = 125 K/W when mounted on epoxy-glass hard tissue (Fig. 1b), but improves to 100 K/W on Al₂O₃ ceramic substrate. Junction-to-lead resistance is fixed at 25 K/W. These values directly determine safe operating power: for example, at 100 °C ambient, the BZG03C12TR3 sustains 3 W only if R_thJA ≤ 25 K/W - achievable only with aggressive copper pour or thermal vias.

Is the BZG03C12TR3 compliant with RoHS and WEEE directives?

Yes, the BZG03C12TR3 is certified lead (Pb)-free and compliant with EU RoHS Directive 2002/95/EC and WEEE Directive 2002/96/EC. Vishay confirms no ozone-depleting substances were used in its manufacture, and full compliance documentation is available under Document Number 85593. This makes the BZG03C12TR3 suitable for export-controlled and environmentally regulated markets without additional qualification.