Taiwan Semiconductor Corporation 1N4736G

Overview

1N4736G from Taiwan Semiconductor is a 1 W, 6.8 V ±5% Zener diode in DO-41 glass package, designed for precision voltage regulation and reference in low-power DC circuits, with 37 mA test current, 3.5 Ω dynamic impedance at I_ZT, and 10 µA leakage at 4 V reverse bias.

For engineers reviewing the 1N4736G datasheet, 1N4736G pinout, 1N4736G application, or 1N4736G equivalent, this device serves as a stable, RoHS-compliant voltage clamp in adapters, on-board DC/DC converters, lighting control, and low-voltage stabilizer designs requiring tight tolerance and hermetic reliability.

Technical Context

The 1N4736G operates as a single-die, silicon planar Zener diode with controlled avalanche breakdown at nominal 6.8 V, specified at 37 mA test current (I_ZT). Its 3.5 Ω Zener impedance (Z_ZT) ensures minimal voltage deviation under load variation, while its 10 µA leakage at 4 V (V_R) confirms low standby power loss.

Thermally rated for junction temperatures up to +200°C and packaged in hermetically sealed DO-41 glass, it delivers stable regulation across industrial ambient conditions, supported by 53.5°C/W junction-to-lead thermal resistance for effective heat dissipation into PCB copper or heatsinking leads.

Key Specifications

Pinout & Package

DO-41 axial-leaded glass package with cathode band marking; pure tin-plated solderable leads per J-STD-002; 242 mg mass; 2.8 mm body diameter, 5.2 mm lead spacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4736A and BZX55C6V8, the 1N4736G offers superior thermal robustness (200°C T_JMAX), lower Z_ZT, and guaranteed RoHS compliance-making it optimal for industrial-grade 1 W reference designs where long-term stability and regulatory alignment are critical.

Availability

1N4736G is available at Aetrix Electronics and suitable for adapter power supplies, on-board DC/DC converters, and LED lighting control requiring stable component supply with full traceability and RoHS-6 compliance.

Supply support for 1N4736G 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, rectifiers, and Zener diodes for industrial and consumer applications.

The 1N47xxG series was developed to deliver high-reliability, RoHS-compliant Zener references with hermetic glass packaging and extended temperature capability for demanding power management subsystems.

FAQ

What is the Zener voltage tolerance of the 1N4736G?

The 1N4736G has a nominal Zener voltage of 6.8 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 6.46 V and 7.14 V at 37 mA test current and 25°C ambient. This tolerance is confirmed in the Electrical Specifications table of the Taiwan Semiconductor datasheet (Version G2301) and applies across the full operating temperature range.

What is the maximum power dissipation for the 1N4736G?

The 1N4736G is rated for 1 W maximum power dissipation at 25°C ambient temperature. Derating is required above 25°C per the thermal resistance values: junction-to-ambient (R_θJA) is 100°C/W, so power must be reduced by 10 mW/°C above 25°C to maintain safe junction temperature limits.

Does the 1N4736G have RoHS compliance documentation?

Yes, the 1N4736G is explicitly marked as RoHS compliant in the official Taiwan Semiconductor datasheet (Version G2301, Page 1). The "G" suffix denotes green compound packaging, and the device meets EU Directive 2011/65/EU without exemptions, including full Pb-free solderability and restricted substance declarations.

What is the Zener impedance (Z_ZT) of the 1N4736G and why does it matter?

The 1N4736G exhibits a Zener impedance (Z_ZT) of 3.5 Ω at 37 mA test current. This low value means the device maintains tight voltage regulation under varying load conditions-e.g., a 35 mA load step causes only ~123 mV output shift-making it suitable for precision feedback and reference applications where stability is critical.

How is polarity indicated on the 1N4736G package?

Polarity on the 1N4736G is indicated by a visible cathode band near one end of the DO-41 glass body. The banded end is the cathode, which must be connected to the higher-potential node in reverse-bias regulation configurations. This marking aligns with JEDEC DO-41 standards and is verified in the Mechanical Data section of the Taiwan Semiconductor datasheet.