Nexperia USA Inc. BZX585-C9V1,115

Overview

BZX585-C9V1,115 from Nexperia is a surface-mount Zener diode in SOD523 (SC-79) package, rated for 9.1 V nominal regulation voltage with ±5 % tolerance, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power handling at 100 µs pulse width. It serves as a precision voltage reference or overvoltage clamp in low-power analog and digital supply rails.

For engineers reviewing the BZX585-C9V1,115 datasheet, BZX585-C9V1,115 pinout, BZX585-C9V1,115 application, or BZX585-C9V1,115 equivalent, key selection criteria include its 9.1 V Zener voltage at 5 mA test current, 20 Ω typical differential resistance, −3.8 to +5.2 mV/K temperature coefficient range, and cathode-anode polarity marking for PCB layout verification.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified Zener voltage of 9.1 V at I_Z = 5 mA, exhibiting low dynamic impedance (20 Ω typ.) and stable regulation under DC or pulsed load conditions. Its thermal resistance from junction to solder point is 65 K/W, enabling reliable operation on FR4 PCBs with minimal copper area.

The device features a negative-to-positive temperature coefficient crossover near 5–6 V; at 9.1 V, it delivers a net positive coefficient (+3.8 to +5.2 mV/K), supporting improved thermal stability in bias networks where drift compensation is required. Reverse leakage remains below 0.5 µA at 7.3 V, ensuring low quiescent current in standby circuits.

Key Specifications

Pinout & Package

SOD523 (SC-79) ultra-small flat-lead surface-mount package: 1.25 mm × 0.85 mm footprint, 0.65 mm height, cathode marked by a visible band on the top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX585-B9V1,115, the C-grade offers broader tolerance at lower cost and identical surge capability; versus MMSZ5240B-7-F, it trades 40 % smaller footprint and 40 % lower P_tot for tighter integration in miniaturized systems.

Availability

BZX585-C9V1,115 is available at Aetrix Electronics and suitable for power supply regulation, overvoltage protection, reference voltage sourcing, and bias network stabilization requiring stable component supply across high-mix, low-volume production runs.

Supply support for BZX585-C9V1,115 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, reliability, and miniaturization.

The BZX585 series targets compact, cost-effective voltage regulation in consumer, computing, and industrial electronics, emphasizing ultra-small packaging and robust transient response without sacrificing precision.

FAQ

What is the maximum continuous forward current for BZX585-C9V1,115?

The device is not rated for continuous forward conduction; its absolute maximum forward current is 200 mA per limiting values table, but forward operation is non-functional. It must be used in reverse-biased Zener mode only, with forward voltage limited to ≤1.1 V at 100 mA pulse (tp ≤ 300 µs). Continuous forward bias risks irreversible junction damage.

Can BZX585-C9V1,115 replace BZX585-B9V1,115 in existing designs?

Yes, with functional trade-offs: the C-grade has wider voltage tolerance (±5 % vs. ±2 %) and slightly higher differential resistance (20 Ω vs. 15 Ω typ.), but identical package, thermal characteristics, and surge rating. Designers should verify that the looser V_Z window (8.65–9.56 V vs. 8.92–9.28 V) meets system regulation margins before substitution.

How does the temperature coefficient affect long-term stability in a 9.1 V reference circuit?

With a measured +3.8 to +5.2 mV/K coefficient, the Zener voltage increases ~0.45 V from −40 °C to +85 °C ambient. In a well-designed PCB layout with adequate copper pour at the cathode pad, this drift is predictable and can be compensated in firmware or trimmed via calibration - unlike uncharacterized drift in resistor-based references.

Is BZX585-C9V1,115 suitable for automotive applications?

No - this part is not AEC-Q200 qualified and lacks automotive-grade screening, extended temperature validation, or guaranteed PPAP documentation. Nexperia explicitly states non-automotive qualification in its legal disclaimers; use only in commercial/industrial environments where ambient temperature stays within −65 °C to +150 °C and no safety-critical function is assigned.