Microchip Technology SMBG5379B/TR13

Overview

SMBG5379B/TR13 from Microsemi is a surface-mount 5 W Zener diode with nominal breakdown voltage of 110 V, ±5% tolerance (B suffix), and maximum regulator current of 12 mA at 25 °C. It features DO-215AA gull-wing package, 25 °C/W junction-to-lead thermal resistance, and is rated for operation from –65 °C to +150 °C. It serves as a precision voltage reference or overvoltage clamp in DC power supply regulation circuits.

For engineers reviewing the SMBG5379B/TR13 datasheet, SMBG5379B/TR13 pinout, SMBG5379B/TR13 application, or SMBG5379B/TR13 equivalent, key selection criteria include Zener voltage accuracy, surge current capability (1000 A @ 8.3 ms), dynamic impedance (125 Ω at IZT), thermal derating behavior on FR4, and RoHS-compliant matte-tin plating compatibility with lead-free reflow.

Technical Context

This device operates in reverse-biased breakdown mode, delivering stable 110 V regulation at its specified test current of 12 mA (IZT). Its dynamic impedance of 125 Ω at IZT and knee impedance of 45 Ω at 1 mA (ZZK) define voltage stability under varying load currents.

The SMBG5379B/TR13 is thermally characterized with RθJL = 25 °C/W and RθJA = 90 °C/W (on FR4, 1 oz Cu), enabling predictable power derating above 25 °C ambient. It withstands non-repetitive 8.3 ms half-sine surge currents up to 1000 A without degradation.

Key Specifications

Pinout & Package

DO-215AA gull-wing surface-mount package with cathode indicated by band; anode and cathode terminals are formed as symmetrical gull-wing leads for visual solder inspection and reliable reflow wetting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5379B and SMBJ5379B, the SMBG5379B/TR13 offers superior manufacturability via gull-wing leads for AOI, identical regulation performance, and seamless integration into high-volume SMT processes without layout redesign.

Availability

SMBG5379B/TR13 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU voltage reference, and telecom line card protection requiring stable component supply, consistent Zener voltage tolerance, and verified surge robustness.

Supply support for SMBG5379B/TR13 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

Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.

The SMBG53xxB series was designed to deliver JEDEC-identical Zener performance in surface-mount form, targeting high-density power management and transient protection in mission-critical systems where thermal stability and surge resilience are mandatory.

FAQ

What is the Zener voltage tolerance of SMBG5379B/TR13?

The SMBG5379B/TR13 has a ±5% Zener voltage tolerance, confirmed by the "B" suffix in its part number per Microsemi's nomenclature. At 25 °C, its nominal V_Z is 110 V, meaning the actual measured value falls between 104.5 V and 115.5 V under I_ZT = 12 mA. This tolerance is maintained across the full operating temperature range of –65 °C to +150 °C, as validated in the Electrical Characteristics table on page 3 of the T4-LDS-0246-1 datasheet.

Does SMBG5379B/TR13 support lead-free reflow soldering?

Yes, SMBG5379B/TR13 is RoHS compliant with annealed matte-tin plating (e3 marking), qualified for peak reflow temperatures up to 260 °C for 10 seconds per MIL-STD-750 Method 2026. Its DO-215AA gull-wing package exhibits excellent wetting and joint integrity under standard Pb-free profiles, and its Level 1 moisture sensitivity eliminates the need for pre-bake prior to assembly - a key advantage for high-throughput SMT lines handling SMBG5379B/TR13.

What is the maximum surge current rating for SMBG5379B/TR13?

The SMBG5379B/TR13 is rated for a non-repetitive peak surge current (I_ZSM) of 1000 A, defined as an 8.3 ms half-sine waveform per Note 4 on page 3 of the datasheet. This rating applies under specified test conditions and reflects the device's ability to absorb transient energy without parametric shift or failure - critical for SMBG5379B/TR13 deployment in automotive load-dump or industrial lightning-surge protection circuits.

How does thermal resistance affect SMBG5379B/TR13 power dissipation?

SMBG5379B/TR13 has R_θJL = 25 °C/W and R_θJA = 90 °C/W (on FR4, 1 oz Cu). At ambient temperatures above 25 °C, its usable power must be derated linearly per Figure 1: for example, at 75 °C ambient, maximum dissipation drops to ~2.8 W. Engineers must size copper area and consider thermal vias to manage junction temperature, especially since SMBG5379B/TR13 operates at 110 V - even small leakage currents generate significant heat if not properly sunk.

Is SMBG5379B/TR13 a direct replacement for 1N5379B?

SMBG5379B/TR13 is electrically identical to 1N5379B per the datasheet's statement that "SMBG5333B–SMBG5388B… is equivalent to the JEDEC registered 1N5333 thru 1N5388B with identical electrical characteristics and testing." However, it is not a mechanical drop-in: SMBG5379B/TR13 uses DO-215AA surface-mount packaging versus 1N5379B's axial T-18. Replacement requires PCB footprint change, though schematic function remains fully interchangeable - a key consideration when migrating legacy 1N5379B designs to SMT using SMBG5379B/TR13.