Diodes Incorporated BZX84C43-7-F

Overview

BZX84C43-7-F from Diodes Incorporated is a 43 V, 2 mA nominal Zener diode in SOT-23 package, rated for 350 mW power dissipation at TA = 25°C, with Zener voltage tolerance ±3.5% (40.0–46.0 V), 150 Ω dynamic impedance at test current, and operating temperature range −65 °C to +150 °C; used for precision voltage regulation and overvoltage protection in low-power DC rails.

For engineers reviewing the BZX84C43-7-F datasheet, BZX84C43-7-F pinout, BZX84C43-7-F application, or BZX84C43-7-F equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (357 °C/W), reverse leakage (<0.1 μA at 30.1 V), forward voltage (0.9 V @ 10 mA), and RoHS-compliant green packaging for automated SMT assembly.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and supply conditions. Its planar die construction ensures consistent voltage regulation, while the SOT-23 package supports high-density PCB layouts and reflow-compatible assembly.

Thermal derating begins above 25°C ambient, with linear power reduction to zero at 150°C; maximum reverse current remains ≤0.1 μA up to 30.1 V, and temperature coefficient is +10.0 to +12.0 mV/°C - enabling predictable drift compensation in voltage-reference circuits.

Key Specifications

Pinout & Package

Package: SOT-23 - surface-mount, 3-terminal plastic case (UL 94V-0), 0.008 g mass, moisture sensitivity level 1, matte tin-plated Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ43VCW-7-F and BZX84-C43,115, the BZX84C43-7-F delivers superior thermal performance (357 vs. 417 °C/W), tighter Zener tolerance control in modern production, and verified halogen-free compliance - making it optimal for new industrial and IoT designs demanding long-term supply stability and environmental certification.

Availability

BZX84C43-7-F is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, PLC input stages, and low-power IoT node voltage reference applications requiring stable component supply, consistent Zener voltage binning, and RoHS-compliant green packaging.

Supply support for BZX84C43-7-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, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The BZX84 series belongs to Diodes' standard Zener diode product line, engineered specifically for cost-sensitive, high-volume voltage regulation and transient suppression in space-constrained SMT applications.

FAQ

What is the maximum reverse voltage before breakdown for BZX84C43-7-F?

The BZX84C43-7-F exhibits sharp reverse breakdown at 43 V nominal, with guaranteed minimum and maximum values of 40.0 V and 46.0 V respectively at 2 mA test current. Below 30.1 V, reverse leakage remains ≤0.1 μA - confirming no significant conduction occurs prior to the specified Zener threshold.

Can BZX84C43-7-F be used in place of a 39 V Zener diode?

No - substituting BZX84C43-7-F for a 39 V Zener introduces a 4 V regulation error, exceeding typical system tolerances. Its 43 V nominal value and ±3.5% spread (40.0–46.0 V) do not overlap the 39 V band. Use BZX84C39-7-F instead, which is specified for 39 V with matching SOT-23 package and thermal ratings.

Is the SOT-23 package of BZX84C43-7-F compatible with standard reflow profiles?

Yes - the SOT-23 package uses matte tin plating qualified per MIL-STD-202 Method 208 and is rated for moisture sensitivity level 1 (J-STD-020D). It supports standard lead-free reflow profiles with peak temperatures up to 260°C and dwell time ≤60 seconds, provided recommended pad layout per AP02001 is followed.

Does BZX84C43-7-F have a specified capacitance value for high-frequency decoupling?

No - the datasheet does not specify total capacitance for BZX84C43-7-F. While Figure 3 shows typical C_T ≈ 15 pF for 43 V devices, this is extrapolated from adjacent part numbers and not tested or guaranteed. For frequency-sensitive applications, consult Diodes' SPICE model library or measure directly using 1 MHz small-signal AC analysis.