Diodes Incorporated BZX84C4V7S-7

Overview

BZX84C4V7S-7 from Diodes Incorporated is a 4.7 V, 200 mW surface-mount Zener diode in SOT-363 package, rated for 5 mA test current with 80 Ω dynamic impedance at 1 kHz and ±0.2 mV/°C temperature coefficient; used for precision voltage reference and overvoltage protection in low-power analog sensor interfaces.

For engineers reviewing the BZX84C4V7S-7 datasheet, BZX84C4V7S-7 pinout, BZX84C4V7S-7 application, or BZX84C4V7S-7 equivalent, key selection criteria include nominal Zener voltage tolerance (±0.3 V), reverse leakage at 2 V (≤3.0 µA), thermal resistance (625 °C/W), and SOT-363 dual-diode layout compatibility with space-constrained PCB designs.

Technical Context

This dual-terminal Zener operates in reverse breakdown mode with a specified 4.7 V nominal regulation at 5 mA test current (IZT), exhibiting low dynamic impedance (80 Ω at 1 kHz) and minimal voltage drift (–3.5 to +0.2 mV/°C) across –65 °C to +150 °C ambient range.

Its planar die construction and ultra-small SOT-363 package support high-density placement in portable electronics; the device is lead-free/RoHS-compliant and qualified to moisture sensitivity level 1 per J-STD-020D.

Key Specifications

Pinout & Package

SOT-363 (SC-70-6) plastic surface-mount package with six terminals; only two pins (C1 and A2) are electrically active as anode and cathode for the single Zener element; remaining pins (C2, A1, NC) are unconnected and internally isolated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ4685-7-F and BZX84-C4V7LT1G, BZX84C4V7S-7 offers optimal balance of ultra-compact size, tight voltage tolerance, and proven reliability in high-volume automated assembly - ideal for miniaturized consumer electronics where board space is constrained and long-term stability is critical.

Availability

BZX84C4V7S-7 is available at Aetrix Electronics and suitable for portable sensor biasing, USB port overvoltage clamp, and low-power ADC reference applications requiring stable component supply, consistent parametric performance, and full RoHS compliance.

Supply support for BZX84C4V7S-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, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The BZX84 series belongs to Diodes' standard Zener diode product line, engineered specifically for cost-sensitive, space-constrained applications demanding stable voltage regulation and robust ESD resilience in consumer, computing, and industrial end-equipment.

FAQ

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

The BZX84C4V7S-7 has a nominal Zener voltage of 4.7 V at 5 mA test current, with guaranteed breakdown occurring between 4.4 V and 5.0 V. It is not rated for sustained reverse operation above 5.0 V; operation beyond this range risks irreversible degradation due to thermal runaway under unregulated current conditions.

Can this part be used in place of a 5.1 V Zener in a voltage reference circuit?

No - the BZX84C4V7S-7 is specified at 4.7 V nominal with ±0.3 V tolerance, making it unsuitable as a direct replacement for a 5.1 V Zener. Substituting would shift reference voltage by ~0.4 V, potentially causing ADC full-scale error, comparator trip-point misalignment, or reset threshold violation in microcontroller circuits.

Is the SOT-363 package thermally adequate for continuous 200 mW dissipation?

No - the 200 mW rating assumes mounting on an FR4 PCB with Diodes Inc.'s recommended pad layout (per AP02001.pdf). In free-air or minimal copper conditions, derating is required: at 70 °C ambient, maximum safe dissipation drops to ~120 mW to maintain junction temperature below 150 °C.

Does this Zener diode have polarity markings on the package?

Yes - the cathode is marked with a color band on the SOT-363 package body, aligned with Pin C1 in the top-view diagram. The marking code "KZ1" appears adjacent to the band, confirming the 4.7 V variant; polarity must be observed during placement to ensure proper reverse-bias operation.