Diodes Incorporated BZT52C11TQ-7-F

Overview

BZT52C11TQ-7-F from Diodes Incorporated is a surface-mount Zener diode with a nominal zener voltage of 11 V, ±5.5% tolerance (10.4–11.6 V), 300 mW power dissipation, and SOD523 package. It operates across –55 °C to +150 °C and delivers stable voltage regulation in low-power biasing and reference circuits for automotive sensor interfaces and industrial control modules.

For engineers reviewing the BZT52C11TQ-7-F datasheet, BZT52C11TQ-7-F pinout, BZT52C11TQ-7-F application, or BZT52C11TQ-7-F equivalent, key selection criteria include zener voltage accuracy at 5 mA test current, 20 Ω dynamic impedance at I_ZT, 0.1 µA reverse leakage at 8.0 V, and thermal resistance of 417 °C/W in standard FR-4 mounting.

Technical Context

This device functions as a precision shunt voltage regulator in reverse-biased mode, maintaining a stable reference voltage across its cathode–anode terminals when reverse current exceeds the knee threshold (I_ZK = 1.0 mA). Its temperature coefficient of +5.4 mV/°C ensures predictable drift behavior over temperature.

The SOD523 package enables high-density PCB layouts while sustaining 300 mW power dissipation under JEDEC-standard conditions (2 oz copper, 1.92 mm² pad). Reverse breakdown characteristics are specified using short-duration pulses to minimize self-heating effects, supporting reliable operation in transient-suppression and voltage-clamping roles.

Key Specifications

Pinout & Package

Package: SOD523 - ultra-compact, flat-lead surface-mount package measuring 0.75–0.85 mm (D) × 1.15–1.25 mm (E) × 0.55–0.65 mm (A), with cathode band marking and matte tin–annealed Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5240BS-7-F and BZX84-C11-7-F, BZT52C11TQ-7-F offers superior voltage accuracy (±5.5% vs ±6%), lower leakage (0.1 µA), and smallest footprint (SOD523), making it optimal for space-constrained, high-stability applications requiring AEC-Q101 readiness.

Availability

BZT52C11TQ-7-F is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial PLC input conditioning, and medical patient monitor power rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for BZT52C11TQ-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, manufacturing, and sales operations across Asia, Europe, and the Americas.

The BZT52C series belongs to Diodes' high-reliability Zener diode product line, engineered specifically for voltage regulation, reference, and protection in automotive, industrial, and medical systems demanding AEC-Q101 qualification and green material compliance.

FAQ

What is the maximum reverse voltage (V_R) that BZT52C11TQ-7-F can withstand before breakdown?

The device exhibits controlled reverse breakdown at its nominal zener voltage of 11 V, with a guaranteed minimum breakdown voltage of 10.4 V at 5 mA test current. It is not rated for sustained reverse blocking above V_Z; operation above this point initiates regulation, not insulation failure. The absolute maximum reverse voltage is defined by its power limit: at 11 V, continuous current must remain below ~27 mA to stay within 300 mW dissipation.

Does BZT52C11TQ-7-F have AEC-Q101 qualification?

No - the standard BZT52C11TQ-7-F is not AEC-Q101 qualified. However, Diodes offers Q-suffix variants (e.g., BZT52C11TQ-7-FQ) that are fully AEC-Q101 qualified, PPAP-capable, and produced in IATF 16949 certified facilities. These automotive-grade versions share identical electrical specs but undergo additional stress testing and process controls.

How does the SOD523 package affect thermal performance compared to SOT-23?

The SOD523 package has higher thermal resistance (R_θJA = 417 °C/W) than typical SOT-23 Zeners (~300 °C/W), due to its smaller pad area and reduced copper exposure. This requires stricter layout adherence - use of 2 oz copper, 1.92 mm² pad, and thermal vias - to achieve rated 300 mW dissipation. Derating begins above 25 °C ambient at ~0.7 mW/°C.

Can BZT52C11TQ-7-F be used in place of a 12 V Zener diode?

No - BZT52C11TQ-7-F is strictly an 11 V device (10.4–11.6 V range); substituting it for a 12 V Zener (e.g., BZT52C12T) would result in ~9% lower regulated voltage, potentially causing undervoltage faults in circuits relying on precise 12 V thresholds. Its temperature coefficient (+5.4 mV/°C) also differs from the +6.0 mV/°C of the 12 V variant, compounding drift mismatch.