Diodes Incorporated BZT52C22T-7

Overview

BZT52C22T-7 from Diodes Incorporated is a surface-mount Zener diode with nominal 22 V zener voltage (20.8–23.3 V range), 300 mW power dissipation, 55 Ω maximum zener impedance at 5 mA, and SOD523 package. It provides precision voltage regulation and overvoltage protection in low-power analog and digital supply rails, including USB interface power supervision and microcontroller reset circuitry.

For engineers reviewing the BZT52C22T-7 datasheet, BZT52C22T-7 pinout, BZT52C22T-7 application, or BZT52C22T-7 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (417 °C/W), reverse leakage (<0.1 µA at 16.4 V), temperature coefficient (+15.4 mV/°C), and JEDEC-qualified reliability for industrial-grade designs.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its 22 V nominal rating targets mid-range voltage clamping and regulation tasks where tighter tolerance than standard 24 V Zeners is required, and its +15.4 mV/°C temperature coefficient enables predictable drift compensation in temperature-sensitive references.

The SOD523 package supports high-density PCB layouts with minimal footprint (1.25 mm × 0.85 mm) and delivers 300 mW power handling via optimized thermal path to ambient air (R_θJA = 417 °C/W). Cathode band marking ensures unambiguous polarity identification during automated assembly and manual inspection.

Key Specifications

Pinout & Package

Two-terminal device in SOD523 package: anode and cathode. Cathode identified by molded band on top surface. No internal bonding wires or multi-pin configuration - terminals are planar metalized pads compatible with reflow soldering per J-STD-020 Level 1 moisture sensitivity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5248BS-7-F and BZX384-C22,115, BZT52C22T-7 delivers superior thermal performance in ultra-compact form factor, enabling higher continuous current in dense layouts while maintaining identical voltage tolerance and leakage-critical for precision analog sensing nodes.

Availability

BZT52C22T-7 is available at Aetrix Electronics and suitable for USB power supervision, microcontroller reset circuitry, industrial sensor signal conditioning, and automotive LIN bus protection requiring stable component supply across production lifecycles.

Supply support for BZT52C22T-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 centers across Asia and manufacturing in IATF 16949-certified facilities.

The BZT52 series belongs to Diodes' precision Zener diode product line, engineered for voltage reference, regulation, and overvoltage protection in space-constrained industrial, computing, and automotive applications.

FAQ

What is the maximum reverse voltage (V_R) before significant leakage occurs in BZT52C22T-7?

At 16.4 V reverse voltage, the specified maximum reverse leakage current is 0.1 µA. This value is measured per datasheet Note 7 using short-duration pulse test to minimize self-heating. Leakage remains below 1 µA up to 20 V, making it suitable for pre-breakdown monitoring applications where low standby current is critical.

Can BZT52C22T-7 be used in parallel for higher power dissipation?

No-Zener diodes exhibit negative temperature coefficients and mismatched breakdown voltages, causing current hogging when paralleled. The datasheet specifies single-device operation only. For >300 mW needs, use a higher-rated Zener (e.g., BZT52C22-13-F) or discrete transistor-based shunt regulator with thermal coupling.

Is BZT52C22T-7 qualified for automotive applications?

The standard BZT52C22T-7 is not AEC-Q200 qualified. Diodes offers automotive-grade variants with Q-suffix (e.g., BZT52C22TQ-7-F) that undergo PPAP, are manufactured in IATF 16949 facilities, and meet AEC-Q200 stress testing. These carry distinct orderable part numbers and packaging markings.

How does the +15.4 mV/°C temperature coefficient affect long-term voltage stability?

Over a 100°C temperature span (–25°C to +75°C), the zener voltage shifts by ±1.54 V-approximately ±7% of nominal 22 V. This drift must be accounted for in precision references; however, it enables predictable compensation when paired with NTC thermistors or complementary silicon diodes in temperature-stabilized designs.