Diodes Incorporated BZT52HC11WFQ-7

Overview

BZT52HC11WFQ from Diodes Incorporated is an AEC-Q101 qualified surface-mount Zener diode with a nominal zener voltage of 11 V (10.4–11.6 V range), 10 Ω maximum zener impedance at 5 mA test current, and ±0.1 µA maximum reverse leakage at 8 V. It delivers 375 mW power dissipation on standard FR-4 PCB and 830 mW with enhanced thermal pad layout, targeting precision voltage regulation in automotive body control modules.

For engineers reviewing the BZT52HC11WFQ datasheet, BZT52HC11WFQ pinout, BZT52HC11WFQ application, or BZT52HC11WFQ equivalent, this device supports low-profile, high-reliability voltage reference and overvoltage protection functions where AEC-Q101 qualification, tight zener tolerance, and stable temperature coefficient (5.4 to 9.0 mV/°C) are critical selection criteria.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its SOD123F package enables compact placement while supporting two distinct thermal derating profiles: 330 °C/W (minimum pad) and 150 °C/W (1 cm² cathode pad).

The device exhibits a positive temperature coefficient (5.4–9.0 mV/°C) and low junction capacitance (85 pF @ 1 MHz, 0 V), making it suitable for DC biasing and noise-sensitive analog reference circuits rather than high-frequency clamping.

Key Specifications

Pinout & Package

Package: SOD123F - flat-lead, low-profile surface-mount package with molded green plastic housing (UL 94V-0), cathode band polarity marking, and matte tin-plated copper alloy terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5240BS-7-F and BZX84-C11-7-F, BZT52HC11WFQ provides superior thermal performance, tighter leakage control, and formal automotive qualification-making it the only option suitable for safety-critical vehicle subsystems requiring PPAP documentation and IATF 16949 traceability.

Availability

BZT52HC11WFQ is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and medical portable devices requiring stable component supply with full AEC-Q101 documentation and long-term lifecycle support.

Supply support for BZT52HC11WFQ 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.

This device belongs to the BZT52HC series of automotive-grade Zener diodes engineered specifically for voltage regulation and protection in harsh-environment electronic control units, emphasizing AEC-Q101 reliability and thermal robustness.

FAQ

What is the maximum reverse voltage before breakdown for BZT52HC11WFQ?

The device begins stable zener breakdown between 10.4 V and 11.6 V at 5 mA test current. Below 10.4 V, reverse leakage remains ≤0.1 µA at 8 V; sustained operation below 10.4 V does not trigger regulation but maintains low leakage. Breakdown is gradual-not abrupt-and requires minimum 0.25 mA to enter specified regulation zone.

Can BZT52HC11WFQ be used in parallel for higher power dissipation?

No-Zener diodes exhibit inherent parameter spread; paralleling causes current imbalance due to mismatched breakdown voltages. Even with matched units, thermal runaway risk increases because lower-V_Z units draw disproportionate current. Use a single device with appropriate PCB thermal pad or select a higher-power package instead.

Is the SOD123F package compatible with standard reflow profiles?

Yes-the SOD123F package is rated for JEDEC J-STD-020 moisture sensitivity Level 1 and supports standard lead-free reflow profiles (peak 260°C, 20–40 sec). Its green molding compound withstands multiple reflow cycles without delamination or solder wettability loss when using recommended pad layout (1.0 mm × 1.5 mm anode/cathode pads).

Does BZT52HC11WFQ support bidirectional ESD protection?

No-it is a unidirectional Zener diode optimized for reverse-bias regulation. While it conducts in forward bias (VF = 0.9 V @ 10 mA), its structure lacks symmetric clamping capability. For bidirectional ESD protection, use purpose-built TVS diodes such as D24M5-7-F or SP1003-01UTG.