Diodes Incorporated BZX84B9V1Q-7-F

Overview

BZX84B9V1Q-7-F from Diodes Incorporated is an AEC-Q101-qualified, ±2% tolerance precision Zener diode in SOT23 package, with nominal zener voltage 9.1 V at 5 mA test current, 350 mW power dissipation, and 15 Ω dynamic impedance at 5 mA. It provides stable voltage reference and overvoltage protection in automotive power management circuits.

For engineers reviewing the BZX84B9V1Q-7-F datasheet, BZX84B9V1Q-7-F pinout, BZX84B9V1Q-7-F application, or BZX84B9V1Q-7-F equivalent, key selection criteria include zener voltage tolerance, thermal resistance (357 °C/W), reverse leakage (<0.5 µA at 6 V), temperature coefficient (+7.0 mV/°C), and automotive qualification status.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain a stable 9.1 V across its terminals when biased above its knee current (1.0 mA). Its low dynamic impedance (15 Ω at I_ZT = 5 mA) ensures minimal output variation under load changes.

The diode exhibits a positive temperature coefficient of +7.0 mV/°C near 9.1 V, enabling predictable drift compensation in temperature-sensitive references. Its SOT23 package supports automated placement and meets J-STD-020 moisture sensitivity level 1 for robust reflow compatibility.

Key Specifications

Pinout & Package

Package: SOT23 - molded plastic case, 0.008 g weight, UL 94V-0 flammability rating, matte tin-plated terminals solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4702T1G and BZX84-C9V1, BZX84B9V1Q-7-F uniquely delivers automotive qualification, ±2% tolerance, and SOT23 compatibility-enabling drop-in replacement in safety-critical vehicle systems without layout or thermal redesign.

Availability

BZX84B9V1Q-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, consumer power adapters, and medical diagnostic equipment requiring stable component supply and long-term lifecycle assurance.

Supply support for BZX84B9V1Q-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 North America.

This part belongs to the BZX84B series of precision Zener diodes engineered specifically for automotive and industrial applications demanding tight voltage tolerance, high reliability, and full regulatory compliance.

FAQ

What is the maximum reverse voltage this Zener can withstand before breakdown?

The BZX84B9V1Q-7-F has a nominal zener voltage of 9.1 V at 5 mA test current, with guaranteed breakdown occurring between 8.92 V and 9.28 V. It is not rated for sustained operation below 6.0 V reverse bias, where leakage remains ≤0.5 µA - operation outside this range risks unstable regulation or excessive power dissipation.

Does this part require external current limiting in circuit design?

Yes - like all Zener diodes, BZX84B9V1Q-7-F requires a series current-limiting resistor to set operating current within 1.0–5.0 mA range. Without it, excessive current causes thermal runaway; the resistor value must be calculated using (V_IN − 9.1 V)/I_Z, accounting for worst-case input and load variations.

How does the +7.0 mV/°C temperature coefficient affect circuit performance?

The +7.0 mV/°C coefficient means output voltage increases by ~0.7 V over a 100°C ambient range (e.g., −40°C to +60°C). In precision references, this drift must be compensated via resistor networks or matched components; however, it enables predictable behavior in temperature-compensated voltage monitors.

Can this Zener diode replace a 9.1 V TL431-based shunt regulator?

No - the BZX84B9V1Q-7-F is a passive two-terminal device with no internal amplification or adjustable feedback. Unlike the TL431, it cannot regulate with millivolt-level accuracy or drive external loads; it serves only as a fixed-voltage clamp or coarse reference, not as an active shunt regulator.