Taiwan Semiconductor Corporation 1SMA5936

Overview

1SMA5936 from Taiwan Semiconductor is a surface-mount 1.5W Zener diode with nominal zener voltage of 30V (±5%), 12.5Ω dynamic impedance at 26mA test current, and maximum DC zener current of 50mA. It features glass-passivated junction, low inductance, and ESD rating Class 3B (HBM), designed for precision voltage regulation in compact power supplies.

For engineers reviewing the 1SMA5936 datasheet, 1SMA5936 pinout, 1SMA5936 application, or 1SMA5936 equivalent, key selection criteria include its DO-214AC (SMA) package compatibility, thermal derating behavior above 75°C, leakage current ≤0.5µA at 22.8V, and suitability for high-reliability SMPS feedback loops and DC/DC converter reference stages.

Technical Context

The 1SMA5936 operates as a single-die, unidirectional voltage regulator diode with cathode-band polarity indication and a junction temperature range of –55°C to +150°C. Its zener voltage is specified at thermal equilibrium with ±5% tolerance, and it exhibits typical reverse leakage <0.5µA above 22.8V.

Designed for surface-mount assembly on 5mm × 5mm Cu pads, the device follows JEDEC JESD201 Class 2 whisker testing and J-STD-020 Moisture Sensitivity Level 1. It delivers stable regulation under steady-state 1.5W dissipation, derating linearly at 20mW/°C above 75°C ambient.

Key Specifications

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration with cathode band marking. Weight: 0.060 g. Molding compound meets UL 94V-0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5257ET1G and 1N4741A, the 1SMA5936 offers 1.5W dissipation in a surface-mount DO-214AC package with superior dynamic impedance (12.5Ω) and lower leakage-enabling higher-accuracy, higher-power shunt regulation without layout or thermal compromises.

Availability

1SMA5936 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, consistent parametric performance, and full RoHS/halogen-free compliance.

Supply support for 1SMA5936 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and consumer markets since 1979.

The 1SMA59xx series was developed specifically for high-reliability, surface-mount voltage regulation in compact power conversion systems-emphasizing thermal robustness, ESD resilience, and tight zener tolerance across wide operating temperatures.

FAQ

What is the zener voltage tolerance for 1SMA5936?

The 1SMA5936 has a zener voltage tolerance of ±5%, with guaranteed minimum, nominal, and maximum values of 28.5V, 30V, and 31.5V respectively at thermal equilibrium and 26mA test current. This tolerance is marked on the device as "936A" and applies across the full operating temperature range of –55°C to +150°C.

Can 1SMA5936 be used in place of 1N4741A?

No-1SMA5936 is not a direct replacement for 1N4741A due to differences in package (DO-214AC vs. DO-41), power rating (1.5W vs. 1W), and dynamic impedance (12.5Ω vs. ~35Ω). While both regulate at ~30V, substituting 1SMA5936 into a 1N4741A footprint requires PCB redesign and thermal validation; it is not a drop-in solution.

What is the maximum allowable junction temperature for 1SMA5936?

The maximum junction temperature (T_J) for 1SMA5936 is +150°C, with a storage temperature range of –55°C to +150°C. Operation at T_J = 150°C requires strict adherence to the derating curve: power dissipation must be reduced by 20mW/°C above 75°C lead temperature (T_L) on a 5mm × 5mm Cu pad.

Does 1SMA5936 meet RoHS and halogen-free requirements?

Yes, 1SMA5936 is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and all plating meets JEDEC J-STD-609 Category 1a for halogen content, making it suitable for environmentally regulated industrial and consumer applications.

What is the leakage current specification for 1SMA5936 at rated voltage?

The 1SMA5936 specifies maximum leakage current (I_R) of 0.5µA at reverse voltage (V_R) = 22.8V, which is 76% of its nominal zener voltage. This low leakage supports energy-efficient standby modes in power supplies and ensures minimal error contribution in precision reference circuits.