Microchip Technology 1N5345E3/TR13

Overview

1N5345E3/TR13 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 8.7 V, ±5% tolerance (B-suffix equivalent), 150 mA maximum Zener current (IZM), 2.0 Ω dynamic impedance (ZZ) at 150 mA test current, and operates across –65 °C to +150 °C. It delivers stable voltage reference in power supply feedback loops, overvoltage protection circuits, and precision biasing networks.

For engineers reviewing the 1N5345E3/TR13 datasheet, 1N5345E3/TR13 pinout, 1N5345E3/TR13 application, or 1N5345E3/TR13 equivalent, key selection criteria include its 8.7 V Zener voltage, 5 W steady-state power rating at TL < 25 °C, low 2.0 Ω dynamic impedance, RoHS-compliant matte-tin plating, and T-18 axial package with cathode band polarity marking.

Technical Context

This device functions as a two-terminal voltage regulator operating in reverse breakdown, maintaining a stable 8.7 V across its terminals over a wide current range (150 mA IZM max, 150 mA IZT test point). Its thermal resistance is 25 °C/W junction-to-lead at 10 mm lead length, enabling high-current operation with minimal heatsinking.

The 1N5345E3/TR13 exhibits 0.20 V voltage regulation (ΔVZ) - the difference between voltages measured at 10% and 50% of IZM - and 500 Ω maximum dynamic knee impedance (ZZK) at 1.0 mA, supporting reliable low-current regulation in standby or sensing paths.

Key Specifications

Pinout & Package

Package: T-18 axial-leaded plastic case (Void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by colored band. Leads are RoHS-compliant annealed matte-tin plated per MIL-STD-750 Method 2026.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5345B and MMSZ5236B-TP, the 1N5345E3/TR13 uniquely combines 5 W axial power handling, RoHS compliance, and JEDEC-standardized T-18 form factor - making it optimal for through-hole industrial power supplies requiring long-term reliability and regulatory alignment.

Availability

1N5345E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller (PLC) analog input stages requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for 1N5345E3/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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and timing solutions for aerospace, defense, and industrial markets.

The 1N53xxE3 series belongs to Microsemi's legacy silicon Zener portfolio, engineered for ruggedized voltage regulation in harsh-environment power systems where thermal stability, surge immunity, and long-term parametric consistency are critical.

FAQ

What is the Zener voltage tolerance of the 1N5345E3/TR13?

The 1N5345E3/TR13 has a nominal Zener voltage of 8.7 V with ±5% tolerance, consistent with the "B" suffix designation in the 1N53xxB family. This tolerance is verified at 25 °C lead temperature using a 150 mA test current and applies across the full operating temperature range of –65 °C to +150 °C per Microsemi's published electrical characteristics table.

Can the 1N5345E3/TR13 be used in surface-mount designs?

No - the 1N5345E3/TR13 uses a T-18 axial-leaded package intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5345B or SMBG5345B in DO-214AA/DO-214AB packages. The 1N5345E3/TR13 itself requires axial insertion and wave or hand soldering; its 10 mm lead length and 25 °C/W junction-to-lead thermal resistance assume lead-mounted thermal path design.

What is the maximum surge current rating for the 1N5345E3/TR13?

The 1N5345E3/TR13 is rated for a maximum non-recurrent surge current (I_ZSM) of 545 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy without degradation, validated per industry surge testing standards and documented in Microsemi's 1N5333B–1N5388B datasheet revision D.

How does the 1N5345E3/TR13 differ from the 1N5345B?

The 1N5345E3/TR13 and 1N5345B share identical electrical specifications (8.7 V, ±5%, 5 W, 150 mA I_ZM), but the 1N5345E3/TR13 features RoHS-compliant matte-tin plating (e3 suffix) and tape-and-reel packaging (TR13 suffix), whereas the 1N5345B uses traditional tin-lead leads and bulk packaging. Both use the same T-18 case and meet JEDEC 1N53xxB registration.

Is thermal derating required for the 1N5345E3/TR13 at elevated ambient temperatures?

Yes - the 1N5345E3/TR13 must be derated above 25 °C ambient when mounted on FR4 board (1.47 W max at 25 °C ambient), per its 85 °C/W junction-to-ambient thermal resistance. When lead-temperature controlled (TL < 25 °C), full 5 W operation is permitted. Derating curves are provided in Figure 1 of the Microsemi datasheet, and thermal design must account for copper pad area, track width, and airflow.