Nexperia USA Inc. PDZ27BZ

Overview

PDZ27BZ from Nexperia is a single low-power Zener diode in SOD323 (SC-76) package, designed for precision voltage regulation at 27 V nominal working voltage with ±2 % tolerance, 400 mW total power dissipation, and 150 Ω maximum differential resistance at I_Z = 5 mA. It delivers stable reverse breakdown with hard knee characteristics and low leakage (≤0.05 μA at V_R = 21 V), suitable for biasing and reference circuits in space-constrained consumer and industrial power supplies.

For engineers reviewing the PDZ27BZ datasheet, PDZ27BZ pinout, PDZ27BZ application, or PDZ27BZ equivalent, this device is selected for low-current voltage clamping, analog reference stabilization, and overvoltage protection where tight Zener voltage tolerance, low dynamic impedance, and surface-mount compatibility are critical.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 26.19 V to 27.53 V at I_Z = 5 mA, exhibiting a temperature coefficient of +23.4 mV/K - indicating positive thermal drift optimized for mid-range voltage references. Its differential resistance remains ≤150 Ω under standard test conditions, enabling predictable regulation across varying load currents.

The device features a hard breakdown knee and very low leakage current (≤0.05 μA at V_R = 21 V), confirming sharp conduction onset and minimal standby power loss. Thermal resistance from junction to ambient is 340 K/W on FR4 PCB, supporting reliable operation up to +150 °C junction temperature under derated power conditions.

Key Specifications

Pinout & Package

PDZ27BZ uses the SOD323 (SC-76) surface-mount plastic package - a 2-pin, 1.35 mm × 0.8 mm footprint with 0.25 mm lead pitch and cathode-marked top-side bar. The package supports reflow and wave soldering per JEDEC J-STD-020 and J-STD-006 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX55C27 and MMSZ5256B, PDZ27BZ offers superior voltage tolerance (±2 % vs. ±5 %), smaller SOD323 footprint, and lower leakage - making it optimal for compact, high-accuracy reference designs where thermal and spatial constraints dominate.

Availability

PDZ27BZ is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and bias network stabilization requiring stable component supply, consistent parametric performance, and SMD manufacturability.

Supply support for PDZ27BZ 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 focused on high-volume, high-reliability logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.

PDZ27BZ belongs to the PDZ-B series of low-power Zener diodes engineered for general-purpose voltage regulation in space-constrained, cost-sensitive consumer and industrial electronics - emphasizing tight tolerance, low leakage, and robust SMT compatibility.

FAQ

What is the maximum reverse current PDZ27BZ can handle before degradation?

The non-repetitive peak reverse current (I_ZSM) is 1.0 A for t_p = 100 µs square wave at T_amb = 25 °C. Continuous reverse current must remain below the Zener test current (5 mA) to maintain regulation stability and avoid thermal runaway; sustained operation above 400 mW total dissipation violates absolute maximum ratings and risks permanent junction damage.

How does the +23.4 mV/K temperature coefficient affect circuit design?

This positive coefficient means V_Z increases by ~23.4 mV per °C rise in junction temperature. In precision references, designers must either compensate using complementary components (e.g., thermistors) or limit ambient temperature swing to ±5 °C to hold regulation within ±0.12 V. It is unsuitable for zero-TC applications without external correction.

Can PDZ27BZ be used in forward-biased configurations?

Yes - its forward voltage is specified at 0.9 V (IF = 10 mA) and 1.1 V (IF = 100 mA). However, it is not optimized for rectification: forward current is limited to 200 mA continuous, and no reverse recovery time or switching speed data is provided. Use only for low-speed, low-current forward conduction where Zener function is secondary.

Is PDZ27BZ automotive-qualified?

No - this device is not automotive-qualified. Nexperia explicitly states in the legal disclaimers that PDZ-B_SER devices are "non-automotive qualified products" and are neither tested nor warranted for use in safety-critical, life-support, or automotive applications. For AEC-Q200 compliance, select Nexperia's Automotive Zener series (e.g., PZTAxx family) instead.