Nexperia USA Inc. BZX8850S-C39-QYL

Overview

BZX8850S-C39-QYL from Nexperia is a low-current Zener voltage regulator diode in the BZX8850S-Q series, designed for precision voltage reference and regulation in space-constrained, low-power circuits. It delivers a nominal 39 V Zener voltage (±5 % tolerance), operates at 50 μA test current, and features 350 Ω differential resistance at 2 mA with a temperature coefficient of +0.05 mV/K - optimized for stable biasing in automotive sensor interfaces and portable battery management systems.

For engineers reviewing the BZX8850S-C39-QYL datasheet, BZX8850S-C39-QYL pinout, BZX8850S-C39-QYL application, or BZX8850S-C39-QYL equivalent, key selection criteria include its ultra-small DFN1006BD-2 package with side-wettable flanks, AEC-Q101 qualification, low leakage profile for noise-sensitive analog rails, and specified reverse capacitance of 45 pF at 0 V.

Technical Context

This Zener diode operates in reverse breakdown mode with a precisely trimmed 39 V nominal working voltage (C-series ±5 %), characterized at I_Z = 2 mA per datasheet Table 9. Its differential resistance of 350 Ω ensures predictable dynamic impedance under small-signal regulation conditions, while the near-zero temperature coefficient (+0.05 mV/K) minimizes thermal drift across −55 °C to +150 °C ambient range.

The device uses a planar epitaxial process and is packaged in a leadless DFN1006BD-2 (SOD882BD) outline with cathode-marked top-side polarity. It meets AEC-Q101 stress requirements for automotive use and exhibits non-repetitive peak reverse power dissipation up to 40 W for 100 µs pulses - supporting transient overvoltage clamping in ESD-protected signal paths.

Key Specifications

Pinout & Package

Package: DFN1006BD-2 (SOD882BD), ultra-small leadless surface-mount plastic package measuring 1.0 mm × 0.6 mm × 0.47 mm with side-wettable flanks for automated optical solder-joint inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX8850S-C39-QYL, the BZX8850S-B39-Q offers tighter voltage control at the cost of slightly higher impedance, while MMSZ5245B-TP trades miniaturization and automotive compliance for higher power handling and broader commercial availability - making the C39-QYL optimal for space-limited, safety-critical automotive subsystems.

Availability

BZX8850S-C39-QYL is available at Aetrix Electronics and suitable for automotive sensor biasing, portable battery voltage monitoring, industrial PLC analog input protection, and medical wearable signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BZX8850S-C39-QYL 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 devices, with core R&D and manufacturing in Europe and Asia.

The BZX8850S-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for low-current, low-noise voltage reference and regulation in space-constrained, thermally demanding environments such as ADAS sensor modules and body control units.

FAQ

What is the maximum reverse voltage that BZX8850S-C39-QYL can safely clamp?

The device is rated for non-repetitive peak reverse power dissipation of 40 W at 100 µs pulse width, corresponding to a peak clamping voltage of approximately 39 V under defined surge conditions. Its absolute maximum reverse voltage is limited by the 39 V Zener breakdown threshold - sustained operation above this value risks irreversible avalanche degradation unless current is strictly limited by external series resistance.

Does BZX8850S-C39-QYL require a heatsink in typical PCB layouts?

No heatsink is required. With a thermal resistance of 340 K/W and total power dissipation capped at 365 mW on standard FR4, junction temperature rise remains within safe limits (<125 °C) even at full-rated power. Layout best practices include maintaining ≥0.5 mm clearance from adjacent thermal sources and using minimum 1 oz copper pour under the DFN pad to enhance conduction.

How does the "intentional minor rise of leakage current" improve performance?

This design feature reduces minority-carrier lifetime in the depletion region, lowering 1/f noise and enabling faster recovery from transient overvoltage events. Measured data shows improved switching response time and reduced broadband noise floor - particularly beneficial in precision analog signal chains like ECG front-ends or current-sense amplifier references where low-frequency interference must be minimized.

Can BZX8850S-C39-QYL be used in parallel for higher power handling?

Parallel operation is not recommended due to mismatch in Zener voltage tolerances (±5 %) and thermal runaway risk. Even small V_Z differences cause current hogging in one device, leading to localized overheating. For higher power needs, select a single higher-rated Zener (e.g., BZX8850S-C39-Q with 500 mW rating) or implement active regulation with a series pass transistor instead.