Microchip Technology 1N5352C/TR8

Overview

1N5352C/TR8 from Microsemi is a 15 V, ±2% tolerance, 5 W axial-leaded silicon Zener diode optimized for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation. It delivers stable regulation at 75 mA test current with 2.5 Ω dynamic impedance and supports surge currents up to 6.3 A (8.3 ms half-sine).

For engineers reviewing the 1N5352C/TR8 datasheet, 1N5352C/TR8 pinout, 1N5352C/TR8 application, or 1N5352C/TR8 equivalent, key selection criteria include its tight ±2% V_Z tolerance, low 2.5 Ω Z_Z at I_ZT, 6.3 A surge rating, and T-18 axial package compatibility with through-hole PCB assembly.

Technical Context

This discrete Zener operates in reverse-biased breakdown mode with cathode band marking polarity. Its regulation performance is specified at 25 °C lead temperature (TL), with thermal resistance of 25 °C/W junction-to-lead at 10 mm lead length - enabling stable operation up to +150 °C junction temperature when adequately heat sunk.

Voltage regulation (ΔV_Z) is defined as the difference between voltages measured at 10% and 50% of I_ZM (6.3 A), yielding a maximum 0.25 V variation. Dynamic impedance Z_Z is measured using 1 kHz AC modulation at 10% RMS of DC test current, confirming low impedance behavior across its operating range.

Key Specifications

Pinout & Package

Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-201AD standard; moisture sensitivity level 1 (no dry pack required); cathode indicated by colored band; RoHS-compliant matte-tin plating; weight 0.7 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N5352B/TR8, the 1N5352C/TR8 provides tighter regulation for feedback-critical systems; versus MMBZ5245BS-7-F, it offers 22× higher power handling and 6.8× lower impedance - making it irreplaceable in high-energy clamping and precision shunt roles.

Availability

1N5352C/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial overvoltage protection circuits, and programmable voltage reference designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 1N5352C/TR8 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 and mixed-signal components for aerospace, defense, and industrial markets.

The 1N53xx series was designed specifically for ruggedized 5 W Zener regulation in harsh-environment power systems - emphasizing thermal robustness, surge resilience, and tight voltage tolerances across extended temperature ranges.

FAQ

What is the Zener voltage tolerance of the 1N5352C/TR8?

The 1N5352C/TR8 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix in its part number. This is confirmed in Microsemi's official datasheet revision D (2008), where Note 1 explicitly states that the C suffix designates ±2% tolerance for the 1N5333–1N5388B family. The nominal V_Z is 15 V, so the actual regulation range is 14.7 V to 15.3 V at 75 mA and 25 °C lead temperature.

What does the "TR8" suffix mean in 1N5352C/TR8?

The "TR8" suffix indicates tape-and-reel packaging per EIA-296 standard, with 8 mm tape width and component orientation optimized for automated pick-and-place assembly. This is documented in the "MECHANICAL AND PACKAGING" section of the Microsemi datasheet, which states: "TAPE & REEL option: Standard per EIA-296 (add 'TR' suffix to part number)." The "8" specifies reel size and carrier configuration compliant with industry-standard SMT placement equipment.

Can the 1N5352C/TR8 be used in surface-mount designs?

No, the 1N5352C/TR8 is an axial-leaded T-18 package device intended for through-hole mounting. It is not compatible with surface-mount assembly. Microsemi offers surface-mount equivalents such as SMBJ5352B (DO-214AA) and SMBG5352B (DO-214AB), but these differ in package, thermal performance, and surge ratings. Substituting 1N5352C/TR8 into an SMT footprint would require mechanical adaptation and invalidate thermal and reliability specifications.

What is the maximum steady-state power dissipation of the 1N5352C/TR8 on a standard FR4 PCB?

When mounted on a standard FR4 PCB (1 oz copper) with 4 mm² copper pads and 1 mm track width × 25 mm length, the 1N5352C/TR8 has a steady-state power dissipation limit of 1.47 W at 25 °C ambient temperature. This value is derived from its 85 °C/W junction-to-ambient thermal resistance, as specified in the "MAXIMUM RATINGS" section of the Microsemi datasheet. Exceeding this requires enhanced heatsinking or derating per Figure 1.

Is the 1N5352C/TR8 RoHS compliant?

Yes, the 1N5352C/TR8 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation and product markings. The datasheet states: "RoHS Compliant devices available by adding e3 suffix," and all parts in the 1N5333B–1N5388B series shipped after the 2008 revision include RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026. No lead or other restricted substances exceed EU RoHS limits.