Diodes Incorporated BZX84C27S-7

Overview

BZX84C27S-7 from Diodes Incorporated is a 27 V, 200 mW surface-mount Zener diode in SOT-363 package, rated for 2 mA test current and 80 Ω maximum Zener impedance at 2 mA, with ±1.8 V zener voltage tolerance (25.1–28.9 V), used for precision voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84C27S-7 datasheet, BZX84C27S-7 pinout, BZX84C27S-7 application, or BZX84C27S-7 equivalent, key selection criteria include nominal zener voltage (27 V), power dissipation (200 mW), zener impedance (80 Ω @ 2 mA), reverse leakage (0.1 µA @ 18.9 V), and SOT-363 dual-diode configuration with common cathode topology.

Technical Context

This dual-anode, single-cathode Zener diode operates in reverse breakdown mode with a nominal zener voltage of 27 V at 2 mA test current, temperature coefficient of +21.4 to +25.3 mV/°C, and maximum reverse current of 0.1 µA at 18.9 V. It uses planar die construction for stable voltage reference performance.

The device is optimized for low-current regulation and clamping in space-constrained PCB layouts, with thermal resistance of 625 °C/W and operating junction temperature range from –65 °C to +150 °C. Its ultra-small SOT-363 package supports dual-channel referencing or bidirectional transient suppression when paired with complementary devices.

Key Specifications

Pinout & Package

SOT-363 package with six terminals: two anodes (A1, A2), one shared cathode (C1/C2), and three no-connect (NC) pins. The device implements a dual-anode, single-cathode configuration ideal for dual-rail referencing or polarity-selectable clamping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5260BS-7-F and BZX84C27LT1G, BZX84C27S-7 offers superior voltage regulation stability (±1.8 V tolerance, 80 Ω Z_ZT) in a dual-anode SOT-363 package-critical for multi-rail sensing and compact dual-clamp designs where thermal and layout constraints dominate.

Availability

BZX84C27S-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and low-power IoT node power management requiring stable component supply and RoHS-compliant sourcing.

Supply support for BZX84C27S-7 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, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The BZX84 series belongs to Diodes' precision Zener diode product line, designed specifically for low-power voltage regulation, reference, and transient suppression in space-constrained surface-mount applications.

FAQ

What is the maximum reverse voltage this diode can withstand before breakdown?

The BZX84C27S-7 has a nominal zener voltage of 27 V with a guaranteed range of 25.1 V to 28.9 V at 2 mA test current. Its absolute maximum reverse voltage is not specified separately-it is designed to operate continuously in reverse breakdown within this range. Exceeding 28.9 V risks exceeding its 200 mW power limit unless current is strictly limited by external series resistance.

Is this device suitable for use as a voltage reference in precision analog circuits?

Yes-its tight 25.1–28.9 V tolerance, low 80 Ω dynamic impedance at 2 mA, and predictable +21.4 to +25.3 mV/°C temperature coefficient make it suitable for moderate-precision references in industrial sensors and power supplies. For sub-0.1% accuracy, additional trimming or temperature compensation is recommended.

How does the SOT-363 package affect thermal performance compared to SOT-23?

The SOT-363 package has higher thermal resistance (625 °C/W) than typical SOT-23 variants (~400–500 °C/W) due to its dual-die construction and smaller copper pad area. This limits continuous power dissipation to 200 mW unless PCB layout includes enhanced copper pour or thermal vias per Diodes' AP02001 guidelines.

Can both Zener elements be used simultaneously with independent anodes?

Yes-the SOT-363 pinout provides two independent anodes (A1, A2) sharing one cathode (C1/C2), enabling simultaneous use for dual-rail referencing (e.g., ±27 V rails) or redundant clamping paths. Each element maintains full 27 V regulation characteristics when biased independently with ≥2 mA current.