Nexperia USA Inc. PDZ3.9BGWJ

Overview

PDZ3.9BGWJ from Nexperia is a single Zener diode in SOD123 package, designed for precision voltage regulation and reference applications with nominal Zener voltage 3.9 V (±2 % tolerance at I_Z = 5 mA), differential resistance ≤90 Ω, reverse current ≤3 μA at V_R = 3.0 V, and AEC-Q101 qualification for automotive environments.

For engineers reviewing the PDZ3.9BGWJ datasheet, PDZ3.9BGWJ pinout, PDZ3.9BGWJ application, or PDZ3.9BGWJ equivalent, this device supports low-power voltage clamping, overvoltage protection, and stable biasing in space-constrained PCB layouts where thermal resistance to ambient (R_th(j-a)) of 340 K/W and junction temperature up to 150 °C are critical design constraints.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled V_Z = 3.89 V to 4.16 V at I_Z = 5 mA and exhibits a negative temperature coefficient of −2.5 mV/K, enabling predictable drift compensation in analog reference circuits. Its low capacitance (370 pF at f = 1 MHz, V_R = 0 V) minimizes signal coupling in high-frequency regulation paths.

The device delivers non-repetitive peak reverse power dissipation up to 40 W (t_p = 100 μs) and total power dissipation of 365 mW at T_amb ≤ 25 °C on standard FR4 PCB, with thermal resistance from junction to solder point rated at 200 K/W - critical for transient surge handling in automotive ECUs and industrial sensors.

Key Specifications

Pinout & Package

SOD123 surface-mount plastic package (3.75 mm × 2.55 mm × 1.3 mm), optimized for automated reflow assembly and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B3V9 and MMSZ4685, PDZ3.9BGWJ offers tighter ±2 % tolerance, lower 3 μA leakage, and superior 40 W surge rating - making it optimal for automotive and high-reliability industrial voltage references where regulation accuracy and transient resilience are prioritized over minimal cost.

Availability

PDZ3.9BGWJ is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial 3.3 V rail clamping, and portable medical device reference applications requiring stable component supply, AEC-Q101 compliance, and long-term lifecycle continuity.

Supply support for PDZ3.9BGWJ 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

Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and automotive-grade quality.

The PDZ-GW series targets general-purpose Zener regulation in space-constrained, thermally demanding applications - especially automotive subsystems and industrial controls needing AEC-Q101 validation and tight voltage tolerance.

FAQ

What is the maximum continuous forward current for PDZ3.9BGWJ?

The absolute maximum forward current is 200 mA per the datasheet limiting values table. However, sustained forward conduction is not its intended use case; the device is optimized for reverse-bias Zener operation. Forward voltage is specified at 10 mA (0.9 V max) and 100 mA (1.1 V max), confirming safe operation below 200 mA with appropriate thermal management.

Does PDZ3.9BGWJ require a series current-limiting resistor in regulation circuits?

Yes - a series resistor is mandatory to limit Zener current and prevent thermal runaway. For example, regulating a 5 V supply to 3.9 V at 5 mA requires (5 V − 3.9 V) / 5 mA = 220 Ω. The resistor value must be selected based on worst-case input voltage, load current variation, and allowable power dissipation in both resistor and diode.

How does the −2.5 mV/K temperature coefficient affect circuit performance?

This negative coefficient means V_Z decreases by 2.5 mV per Kelvin rise in junction temperature. At 85 °C ambient (assuming ~30 °C rise), V_Z drops ~75 mV from nominal - a 1.9 % shift. Designers compensate by selecting operating I_Z where r_dif is lowest (e.g., 5 mA) and using thermal layout techniques to stabilize T_j.

Can PDZ3.9BGWJ replace PDZ3.9B in existing designs?

Yes - PDZ3.9BGWJ is a direct functional and mechanical replacement for PDZ3.9B, sharing identical SOD123 package, pinout, electrical specifications, and AEC-Q101 qualification. The "J" suffix denotes tape-and-reel packaging per JEDEC standards; no electrical or thermal differences exist between "B" and "BJ" variants.