Diodes Incorporated 1N4735A-T

Overview

1N4735A-T from Diodes Incorporated is a 1.0 W, 6.2 V ±5% Zener diode in DO-41 glass package, designed for precision voltage regulation and reference applications with 2.0 Ω zener impedance at 41 mA test current and -65°C to +175°C operating temperature range. It delivers stable clamping in power supply feedback loops, overvoltage protection circuits, and analog reference designs.

For engineers reviewing the 1N4735A-T datasheet, 1N4735A-T pinout, 1N4735A-T application, or 1N4735A-T equivalent, key selection criteria include nominal zener voltage (6.2 V), power dissipation (1.0 W), zener impedance (2.0 Ω), temperature coefficient (+0.01 to +0.055 %/°C), and DO-41 mechanical compatibility.

Technical Context

This discrete Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals under varying load and temperature conditions. Its low dynamic impedance (2.0 Ω at I_ZT = 41 mA) ensures minimal output voltage variation during transient current changes.

The device features a glass-passivated DO-41 package with cathode band polarity marking, Sn96.5Ag3.5 solderable terminations, and UL 94V-0 flammability rating. Thermal resistance is 175 °C/W junction-to-ambient when leads are held at 50°C with 9.5 mm lead length.

Key Specifications

Pinout & Package

DO-41 glass axial package with cathode band marking; two-terminal unidirectional device. Polarity is defined by cathode band - anode is unmarked end.

Key Features

Applications

Availability

1N4735A-T is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, industrial sensor references, and linear regulator pre-regulation requiring stable component supply and long-lifecycle support.

Supply support for 1N4735A-T 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for industrial, automotive, and computing markets.

The 1N47xxA series belongs to Diodes' standard Zener diode product line, engineered for cost-effective, robust voltage regulation in legacy and new-design through-hole applications.

FAQ

What is the difference between 1N4735A-T and 1N4735A-A?

The suffix "-T" denotes tape-and-reel packaging (5,000 units per reel), while "-A" indicates ammo pack (5,000 units per tube). Both share identical electrical specifications, DO-41 package, and 6.2 V zener voltage. Packaging format affects automated assembly compatibility and storage handling but not performance or pinout.

Can 1N4735A-T replace 1N4733A in a 5.1 V reference design?

No - 1N4735A-T has a nominal zener voltage of 6.2 V, whereas 1N4733A is rated at 5.1 V. Substituting them would shift the regulated voltage by 1.1 V, violating design margins. The devices differ in test current (41 mA vs. 49 mA), zener impedance (2.0 Ω vs. 7.0 Ω), and temperature coefficient range.

Is 1N4735A-T RoHS compliant and lead-free?

Yes - 1N4735A-T uses Sn96.5Ag3.5 (lead-free) terminations and complies with EU Directive 2002/95/EC (RoHS), including applicable exemptions for glass and high-temperature solder. It meets MIL-STD-202 solderability requirements and carries UL 94V-0 flammability rating.

What is the maximum allowable ambient temperature for full 1.0 W operation?

Full 1.0 W power dissipation is rated only at T_A = 25°C. Above 50°C, derating begins at 6.67 mW/°C. At 70°C ambient, maximum power drops to 867 mW; at 100°C, it falls to 667 mW. Derating assumes 9.5 mm lead length held at 50°C per datasheet Note 1.