Nexperia USA Inc. BZX84-C9V1,235

Overview

BZX84-C9V1,235 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, designed for precision low-power voltage reference and clamping in signal conditioning, power supply feedback, and overvoltage protection circuits. It delivers 9.1 V nominal breakdown at 5 mA, with 100 Ω typical differential resistance, 0.5 μA reverse current at 7 V, and 3.8 mV/K temperature coefficient.

For engineers reviewing the BZX84-C9V1,235 datasheet, BZX84-C9V1,235 pinout, BZX84-C9V1,235 application, or BZX84-C9V1,235 equivalent, this page provides verified electrical parameters, thermal behavior, SOT23 terminal mapping, real-world use cases in analog sensing and LDO feedback, and validated alternative parts with documented tolerance and temperature coefficient differences.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified Zener voltage. Its operation relies on controlled avalanche and Zener breakdown mechanisms, with junction temperature directly influencing regulation accuracy via a +3.8 mV/K coefficient.

The SOT23 package enables surface-mount integration into space-constrained PCBs while limiting thermal dissipation to 250 mW at 25 °C ambient. Non-repetitive surge capability of 40 W (100 μs pulse) supports transient overvoltage suppression without permanent degradation.

Key Specifications

Pinout & Package

Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with 1.9 mm × 1.1 mm body, 0.95 mm height, and standard reflow footprint per Figure 12.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5240BLT1G, BZX84-C9V1,235 offers lower dynamic impedance for improved line/load regulation but less favorable temperature drift; versus BZX84-C9V1-E3-08, it shares identical electrical specs but lacks automotive-grade stress testing and traceability documentation.

Availability

BZX84-C9V1,235 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, LDO feedback referencing, microcontroller I/O protection, and ADC input limiting requiring stable component supply across production volumes.

Supply support for BZX84-C9V1,235 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 essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.

The BZX84 series belongs to Nexperia's precision Zener regulator product line, engineered for cost-sensitive, space-constrained applications demanding stable voltage references from 2.4 V to 75 V with defined tolerance and thermal behavior.

FAQ

What is the maximum continuous reverse current this diode can handle at 9.1 V?

At 9.1 V Zener voltage and 25 °C ambient, the device dissipates 250 mW maximum. Using P = V × I, the corresponding continuous reverse current is 27.5 mA. Exceeding this requires derating per the R_th(j-a) = 500 K/W curve to maintain T_j ≤ 150 °C.

Can Pin 2 be grounded or left floating on the PCB?

Pin 2 is internally not connected and must remain unconnected on the PCB. Grounding it introduces parasitic capacitance and potential noise coupling into the cathode-anode path, degrading regulation accuracy and transient response. The datasheet explicitly labels it "n.c." with no internal bond wire.

How does the +3.8 mV/K temperature coefficient affect regulation accuracy over temperature?

Over a 100 °C range (−40 °C to +60 °C), the coefficient causes a +380 mV shift in V_Z. For a 9.1 V nominal rating, that represents +4.2 % drift. This is acceptable in non-critical biasing but requires compensation in precision references-e.g., pairing with a negative-coefficient thermistor in the feedback network.

Is this diode suitable for protecting 5 V logic inputs against 12 V transients?

Yes-when configured with anode to ground and cathode to the protected line, it clamps positive transients above 9.1 V. However, ensure series current-limiting resistance restricts peak clamp current to ≤200 mA (IF max) and that 40 W surge energy (100 μs) does not exceed the system's transient profile, as repeated surges degrade long-term reliability.