Taiwan Semiconductor Corporation BZY55B36

Overview

BZY55B36 from Taiwan Semiconductor is a surface-mount Zener diode with a nominal zener voltage of 36.0 V ±2%, 500 mW power dissipation, and 5 mA test current; it serves as a precision voltage reference or low-power voltage stabilizer in DC/DC converters and lighting control circuits.

For engineers reviewing the BZY55B36 datasheet, BZY55B36 pinout, BZY55B36 application, or BZY55B36 equivalent, key selection criteria include zener voltage tolerance (±2%), dynamic impedance (80 Ω at 5 mA), leakage current (0.1 µA at 27 V), thermal resistance (300 °C/W), and 0805 ceramic package compatibility with automated SMT assembly.

Technical Context

The BZY55B36 operates as a single-die, unidirectional silicon Zener diode optimized for stable reverse-bias regulation. Its breakdown behavior is characterized under 10 ms pulse conditions, with zener voltage specified at 35.28–36.72 V and dynamic impedance measured at 80 Ω using 10% AC superimposition on 5 mA DC test current.

It features a cathode band polarity indicator, meets JESD201 Class 1A whisker resistance, and is rated for junction temperatures from –55 °C to +150 °C. The device exhibits forward voltage of 1.5 V at 10 mA and has a typical capacitance of ~100 pF at 0 V bias per curve data across the 36 V variant.

Key Specifications

Pinout & Package

Package: 0805 ceramic surface-mount case with cathode indicated by a visible band on one end. No discrete pins - terminals are solder pads on opposite ends of the rectangular body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5270B and 1N4738A, the BZY55B36 offers tighter ±2% voltage tolerance and 0805 SMT compatibility-critical for high-density, automated production of compact DC/DC modules and LED drivers where precision and assembly efficiency are jointly constrained.

Availability

BZY55B36 is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, and lighting applications requiring stable component supply with consistent parametric performance across production batches.

Supply support for BZY55B36 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 BZY55 series was designed specifically for high-volume, cost-sensitive surface-mount voltage reference and stabilization applications-emphasizing tight tolerance, robust thermal performance, and J-STD-020 Level 1 manufacturability.

FAQ

What is the exact zener voltage range for BZY55B36?

The BZY55B36 has a guaranteed zener voltage range of 35.28 V to 36.72 V at 5 mA test current, reflecting its ±2% tolerance specification. This range is validated under 10 ms pulse test conditions per Taiwan Semiconductor's official datasheet revision D2301. The nominal value is 36.0 V, and the device maintains this regulation window across its full operating temperature range of –55 °C to +150 °C.

Is BZY55B36 RoHS compliant and halogen-free?

Yes, the BZY55B36 is RoHS compliant per EU Directive 2011/65/EU and meets Taiwan Semiconductor's internal halogen-free material definition (Br < 900 ppm, Cl < 900 ppm, total halogens < 1500 ppm). This compliance is confirmed in the "Features" section of the official datasheet and applies to all units shipped under ordering code BZY55B36 RBG in 0805 ceramic packaging.

What is the maximum allowable power dissipation for BZY55B36 at 100°C ambient?

At 100°C ambient temperature, the BZY55B36 must be derated from its 500 mW maximum rating. Using its junction-to-ambient thermal resistance of 300 °C/W, the allowable power drops to approximately 167 mW to maintain T_J ≤ 150 °C. This derating is defined in Figure 4 ("Admissible Power Dissipation Curve") of the BZY55B2V4–BZY55B36 datasheet.

Does BZY55B36 have a specified capacitance value, and how does it affect high-frequency use?

Yes, the BZY55B36 exhibits a typical capacitance of ~100 pF at 0 V bias, as shown in Figure 5 of the datasheet. This parasitic capacitance limits its effectiveness in RF bypass or fast transient suppression above ~10 MHz but remains negligible in DC/DC converter feedback and low-frequency voltage reference applications where BZY55B36 is typically deployed.

Can BZY55B36 replace BZY55C36 in an existing design?

No-BZY55B36 and BZY55C36 differ in voltage tolerance: B-series offers ±2%, while C-series offers ±5%. Substituting BZY55B36 for BZY55C36 may cause overdesign or unnecessary cost; substituting BZY55C36 for BZY55B36 risks violating regulation accuracy in precision feedback paths. The part numbers reflect distinct tolerance grades and are not interchangeable without circuit validation.