Microchip Technology 1N4735CP/TR12

Overview

1N4735CP/TR12 from Microsemi is a 1.0 W axial-lead silicon Zener diode with a nominal Zener voltage of 6.2 V ±5%, 41 mA test current, 2 Ω dynamic impedance at I_ZT, and maximum reverse leakage of 10 μA at 4.96 V. It regulates voltage in low-power reference and protection circuits across industrial control, power supply feedback, and sensor biasing applications.

For engineers reviewing the 1N4735CP/TR12 datasheet, 1N4735CP/TR12 pinout, 1N4735CP/TR12 application, or 1N4735CP/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45 °C/W junction-to-lead), surge current rating (730 mA), operating temperature range (–65 °C to +150 °C), and RoHS-compliant matte-tin plating.

Technical Context

This device operates in reverse breakdown to maintain stable voltage under varying load and temperature conditions. Its 6.2 V Zener voltage exhibits a near-zero temperature coefficient (~0 mV/°C per Figure 3), making it suitable for precision reference designs where drift minimization is critical.

The DO-41 (DO-204AL) plastic package provides moisture sensitivity Level 1 per J-STD-020B and supports axial through-hole mounting. Thermal performance is defined at 3/8″ (10 mm) lead length from body (45 °C/W) or on FR4 PCB (105 °C/W), enabling accurate derating in real-world layouts.

Key Specifications

Pinout & Package

Package: DO-41 (DO-204AL) plastic molded case with cathode band marking; void-free UL94V-0 epoxy body; tin-lead or RoHS-compliant matte-tin terminals; weight 0.7 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4735A and BZX55C6V2, the 1N4735CP/TR12 offers superior thermal performance, higher surge capability, and RoHS-compliant plating-making it optimal for industrial-grade 1 W reference and clamping roles where long-term stability and ruggedness are prioritized.

Availability

1N4735CP/TR12 is available at Aetrix Electronics and suitable for industrial control systems, power supply protection circuits, and sensor signal conditioning requiring stable component supply and full traceability.

Supply support for 1N4735CP/TR12 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 1N4735CP/TR12 belongs to Microsemi's legacy 1N47xxAP Zener family-designed specifically for robust, JEDEC-standard voltage regulation in harsh-environment applications demanding wide temperature range and proven long-term stability.

FAQ

What is the Zener voltage tolerance of the 1N4735CP/TR12?

The 1N4735CP/TR12 has a nominal Zener voltage of 6.2 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 41 mA test current and 25 °C lead temperature. The 1N4735CP/TR12 maintains this specification across its full operating temperature range of –65 °C to +150 °C, supporting reliable voltage reference performance in demanding environments.

Does the 1N4735CP/TR12 require dry packing before reflow soldering?

No, the 1N4735CP/TR12 does not require dry packing prior to soldering. It is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and processed indefinitely at standard ambient conditions without baking. This eliminates handling overhead and reduces risk of moisture-induced defects during assembly-confirming the 1N4735CP/TR12's suitability for high-mix manufacturing environments.

What is the maximum surge current rating for the 1N4735CP/TR12?

The 1N4735CP/TR12 is rated for a maximum non-repetitive surge current (I_SM) of 730 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating applies under specified test conditions and reflects the device's ability to absorb transient energy without parametric shift or failure-making the 1N4735CP/TR12 appropriate for overvoltage protection in power rails subject to switching transients.

How does the thermal resistance of the 1N4735CP/TR12 compare to glass-body variants?

The 1N4735CP/TR12 features a plastic DO-41 package with a junction-to-lead thermal resistance of 45 °C/W at 3/8″ (10 mm) lead length-significantly lower than the ≈60 °C/W typical of glass-body 1N4735A variants. This improved thermal path allows higher sustained power dissipation and better temperature stability in compact layouts, directly enhancing the reliability of the 1N4735CP/TR12 in thermally dense PCB designs.

Is the 1N4735CP/TR12 RoHS compliant?

Yes, the 1N4735CP/TR12 is RoHS compliant, as confirmed by the "e3" suffix in its full ordering designation. It uses annealed matte-tin plating on terminals, meeting both RoHS Directive 2011/65/EU and JEDEC J-STD-020B requirements. This ensures compatibility with lead-free soldering processes while maintaining solderability and long-term intermetallic integrity-critical for the 1N4735CP/TR12's use in environmentally regulated industrial and medical products.