Diodes Incorporated BZX84C12T-7-F

Overview

BZX84C12T-7-F from Diodes Incorporated is a 12 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 5 mA test current with ±5% tolerance (11.4–12.7 V), 25 Ω max zener impedance at I_ZT, and 0.1 µA max reverse leakage at 8.0 V. It provides precision voltage regulation in low-power biasing and reference circuits.

For engineers reviewing the BZX84C12T-7-F datasheet, BZX84C12T-7-F pinout, BZX84C12T-7-F application, or BZX84C12T-7-F equivalent, key selection criteria include zener voltage tolerance, dynamic impedance at 5 mA, thermal resistance (833 °C/W), reverse leakage at VR, and SOT-523 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode uses planar die construction for stable breakdown characteristics and low noise performance. Its 12 V nominal zener voltage is specified at 5 mA test current with temperature coefficient of +6.0 to +10.0 mV/°C, enabling predictable drift compensation in analog references.

The device operates across –65 °C to +150 °C and dissipates up to 150 mW on FR-4 board with recommended pad layout. Thermal resistance of 833 °C/W reflects its ultra-small SOT-523 package's inherent limitation in heat dissipation under sustained load.

Key Specifications

Pinout & Package

Package: SOT-523 - ultra-compact 3-pin surface-mount plastic case (1.6 mm × 0.8 mm × 0.9 mm), UL 94V-0 rated, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5242BS-7-F, BZX84C12T-7-F offers tighter impedance and higher power in smaller SOT-523; versus BZX84-C12LT1G, it trades thermal robustness for 60% board area reduction-critical in miniaturized sensor transmitters.

Availability

BZX84C12T-7-F is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automotive body controllers, and battery-powered IoT gateways requiring stable component supply and long-term obsolescence management.

Supply support for BZX84C12T-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 centers across Asia and manufacturing in China, Taiwan, and the U.S.

The BZX84 series belongs to Diodes' precision Zener portfolio targeting low-power voltage reference and clamping applications in space-constrained, cost-sensitive consumer and industrial electronics.

FAQ

What is the maximum reverse voltage before breakdown for BZX84C12T-7-F?

The device exhibits sharp reverse breakdown at 11.4–12.7 V when tested at 5 mA (I_ZT). Below 8.0 V, reverse leakage remains ≤0.1 µA; operation between 8.0 V and 11.4 V is non-regulating and not characterized for stability or impedance.

Can BZX84C12T-7-F be used in parallel for higher current capability?

No-Zener diodes exhibit manufacturing spread in V_Z and tempco, causing current hogging when paralleled. Even matched units show >5% V_Z variation, leading to thermal runaway. Use a single higher-power Zener or active regulation instead.

Is the SOT-523 package compatible with standard reflow profiles?

Yes-the device meets IPC-J-STD-020D Level 1 moisture sensitivity and is qualified for lead-free reflow with peak temperatures up to 260 °C. Its matte tin plating and Alloy 42 leadframe ensure reliable solder joint formation without voiding or dewetting.

How does temperature affect regulation accuracy in practical use?

At 5 mA, V_Z drifts +6.0 to +10.0 mV/°C. Over a 100 °C range (–25 to +75 °C), this causes +0.6 to +1.0 V shift-requiring compensation in precision references. For <±0.1 V error, limit ambient swing to ≤10 °C or add tempco-matched resistors.