Diodes Incorporated BZX84C27W-7-F

Overview

BZX84C27W-7-F from Diodes Incorporated is a 27 V, 200 mW surface-mount Zener diode in SOT-323 package, with nominal Zener voltage 27 V (min 25.1 V, max 28.9 V), test current 2.0 mA, and maximum Zener impedance 80 Ω at 2.0 mA. It provides precision voltage regulation in low-power biasing and reference circuits, such as power supply feedback networks and analog sensor excitation.

For engineers reviewing the BZX84C27W-7-F datasheet, BZX84C27W-7-F pinout, BZX84C27W-7-F application, or BZX84C27W-7-F equivalent, key selection criteria include Zener voltage tolerance (±3.3%), low leakage (<0.1 µA @ 18.9 V), temperature coefficient (+21.4 to +25.3 mV/°C), and SOT-323 thermal resistance (625 K/W).

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its planar die construction ensures consistent breakdown characteristics and low dynamic impedance (80 Ω at 2.0 mA) for tight regulation in low-current applications.

Designed for ambient temperatures from –65 °C to +125 °C, it features ultra-small SOT-323 packaging with lead-free, RoHS-compliant matte tin plating and UL 94V-0 flammability rating. Moisture sensitivity level is Level 1 per J-STD-020D.

Key Specifications

Pinout & Package

SOT-323 package with anode-cathode configuration: cathode marked by beveled edge or dot; standard pinout is Cathode–Anode–NC (pin 1 = cathode, pin 2 = anode, pin 3 = not connected). Molded plastic case uses green compound compliant with UL 94V-0.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5256BS-7-F and BZX84-C27LT1G, BZX84C27W-7-F offers optimal balance of SOT-323 size, 2.0 mA test current alignment with low-power circuits, and ±3.3% tolerance-making it preferred for space-constrained, battery-powered, or precision-bias applications where thermal budget and footprint are primary constraints.

Availability

BZX84C27W-7-F is available at Aetrix Electronics and suitable for industrial control systems, sensor signal conditioning modules, and compact DC-DC converter designs requiring stable component supply and long-term obsolescence management.

Supply support for BZX84C27W-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, with design and manufacturing operations across Asia and the Americas.

The BZX84 series belongs to Diodes' precision Zener diode product line, engineered specifically for voltage reference, regulation, and protection in space-constrained, cost-sensitive consumer, industrial, and computing applications.

FAQ

What is the maximum reverse leakage current for BZX84C27W-7-F at 18.9 V?

The maximum reverse leakage current is 0.1 µA at VR = 18.9 V and TA = 25 °C, as specified in the Electrical Characteristics table. This value reflects worst-case leakage under partial breakdown conditions and is critical for low-power bias network integrity.

Does BZX84C27W-7-F have a specified junction-to-ambient thermal resistance?

Yes, RθJA is 625 K/W when mounted on an FR4 PCB using the recommended pad layout per Diodes Application Note AP02001. This value assumes standard 1 oz copper, no thermal vias, and defines safe continuous power dissipation limits at elevated ambient temperatures.

Is the SOT-323 package of BZX84C27W-7-F compatible with automated pick-and-place equipment?

Yes, the SOT-323 package meets JEDEC standards for tape-and-reel packaging (3000 units per reel, -7-F suffix), and its standardized dimensions (2.2 × 1.35 × 0.9 mm) and matte tin plating ensure reliable feeding, vision alignment, and solder paste release in high-volume SMT assembly.

How does the temperature coefficient affect regulation accuracy over –40 °C to +85 °C?

With a specified coefficient of +21.4 to +25.3 mV/°C, the Zener voltage increases ~1.07–1.27 V across a 50 °C span. For applications requiring <1% total drift, external compensation (e.g., series thermistor) or tighter-tolerance variants should be considered.