Diodes Incorporated BZX84C36T-7-F

Overview

BZX84C36T-7-F from Diodes Incorporated is a 36 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 2 mA test current with 34–38 V zener voltage tolerance, 90 Ω dynamic impedance at 2 mA, and -65 °C to +150 °C operating temperature range; used for precision voltage reference and overvoltage protection in compact power management circuits.

For engineers reviewing the BZX84C36T-7-F datasheet, BZX84C36T-7-F pinout, BZX84C36T-7-F application, or BZX84C36T-7-F equivalent, key selection criteria include zener voltage tolerance (±5.6%), low thermal resistance (833 °C/W), RoHS-compliant matte tin plating, ultra-small SOT-523 footprint, and guaranteed reverse leakage <0.1 µA at 28.8 V.

Technical Context

This device operates as a silicon planar Zener diode with controlled avalanche breakdown at nominal 36 V, optimized for stable regulation under low-current conditions (IZT = 2 mA). Its construction uses alloy-42 leadframe with annealed matte tin plating and green molding compound compliant with halogen-free requirements.

Thermal performance is defined by 833 °C/W junction-to-ambient resistance on FR-4 PCB with recommended pad layout, and power derating begins linearly above 25 °C ambient. The device exhibits a positive temperature coefficient of +25.2 to +37.4 mV/°C at 5 mA, enabling predictable drift compensation in reference designs.

Key Specifications

Pinout & Package

Package: SOT-523 - ultra-compact surface-mount plastic case (1.60 mm × 0.80 mm × 0.50 mm), UL 94V-0 rated, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84C36T-7-F, MMSZ4702T1G trades ultra-compact size for higher surge capability, while BZX84-C36LT1G retains identical electrical specs but sacrifices 75% board area efficiency-making the SOT-523 variant optimal for next-gen wearables and IoT edge nodes.

Availability

BZX84C36T-7-F is available at Aetrix Electronics and suitable for industrial power monitoring, portable medical sensors, automotive body control modules, and consumer IoT gateways requiring stable component supply across multi-year production cycles.

Supply support for BZX84C36T-7-F 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 industrial, computing, communications, and consumer markets with high-reliability components.

The BZX84 series belongs to Diodes Inc.'s precision Zener portfolio, engineered specifically for voltage regulation and protection in space-constrained, cost-sensitive applications where consistent breakdown behavior and environmental compliance are mandatory.

FAQ

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

The BZX84C36T-7-F has a nominal zener voltage of 36.0 V with a guaranteed range of 34.0–38.0 V at 2 mA test current. It begins controlled avalanche breakdown within this band and is not rated for sustained operation above 38.0 V in regulation mode. Reverse voltage exceeding 38.0 V may cause irreversible thermal runaway if power dissipation exceeds 150 mW.

Is this device suitable for use in automotive applications?

Yes - its -65 °C to +150 °C operating temperature range, AEC-Q200 stress testing alignment (per Diodes Inc. qualification reports), and RoHS/halogen-free construction meet baseline requirements for non-safety-critical automotive subsystems such as infotainment power rails and body electronics, though it is not AEC-Q101 qualified.

How does the SOT-523 package affect thermal performance compared to SOT-23?

The SOT-523's smaller die pad and reduced copper exposure increase thermal resistance to 833 °C/W versus ~300–400 °C/W for typical SOT-23 variants. This requires tighter ambient temperature control or derating above 25 °C - e.g., max 105 mW at 75 °C ambient - making it best suited for low-duty-cycle or intermittent regulation tasks.

Can this Zener diode replace a 33 V or 39 V variant in the same circuit?

No - the 36 V rating is fixed by process-controlled doping; substituting with BZX84C33T or BZX84C39T alters regulation point by ±3 V, shifting feedback thresholds and potentially causing overvoltage or undervoltage faults. Only interchange within the same nominal voltage grade (e.g., BZX84C36T-7-F ↔ BZX84-C36LT1G) maintains functional equivalence.