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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

NXP Semiconductors BZX84-C39/LF1R

Name: BZX84-C39/LF1R
Brand: NXP Semiconductors
SKU: BZX84-C39/LF1R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-C39/LF1R

Manufacturer:: NXP Semiconductors

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BZX84-C39/LF1R.pdf

Description:: DIODE ZENER 39V 250MW SOT23

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Product details

Overview

BZX84-C39/LF1R from NXP Semiconductors is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 39 V nominal breakdown voltage at 2 mA, 250 mW total power dissipation, and AEC-Q101 qualified for automotive use. It provides stable reference voltage in low-power supply regulation and overvoltage protection circuits.

For engineers reviewing the BZX84-C39/LF1R datasheet, BZX84-C39/LF1R pinout, BZX84-C39/LF1R application, or BZX84-C39/LF1R equivalent, key selection criteria include its 39 V Zener voltage tolerance (±5 %), differential resistance of ≤350 Ω at 2 mA, reverse current ≤40 μA at 29.4 V, temperature coefficient of +27.3 to +41.2 mV/K, and non-repetitive peak reverse current capability of 0.7 A.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining a stable output voltage across its cathode-anode terminals when reverse-biased above its specified Zener voltage. Its behavior is defined by reverse breakdown characteristics, including dynamic impedance, temperature coefficient, and leakage current under specified test conditions.

The BZX84-C39/LF1R exhibits a positive temperature coefficient (+27.3 to +41.2 mV/K) and is characterized at T_j = 25 °C with I_Z = 2 mA. It supports non-repetitive surge handling up to 0.7 A for 100 μs pulses and is qualified per AEC-Q101 for automotive-grade reliability.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	37.0 V to 41.0 V at I_Z = 2 mA - defines usable regulation range under standard test current
Differential Resistance (r_diff)	≤350 Ω at I_Z = 2 mA - determines output voltage stability under load variation
Reverse Current (I_R)	≤40 μA at V_R = 29.4 V - specifies leakage level below breakdown, critical for low-power standby operation
Temperature Coefficient (S_Z)	+27.3 to +41.2 mV/K - quantifies voltage drift per degree Celsius, enabling thermal error budgeting
Total Power Dissipation (P_tot)	250 mW at T_amb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB
Non-repetitive Peak Reverse Current (I_ZSM)	0.7 A for t_p ≤ 100 μs - defines transient overvoltage clamping capability
Forward Voltage (V_F)	≤0.9 V at I_F = 10 mA - relevant for polarity-sensitive protection or dual-use configurations

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; compact footprint (2.8 × 1.4 mm), 0.95 mm height, and standard 0.95 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1 (Anode)	Anode	Connected to lower-potential node in reverse-bias regulation; forward conduction path when used as rectifier
2 (n.c.)	Not connected	Internally unconnected terminal; no electrical function - must remain floating in PCB layout
3 (Cathode)	Cathode	Connected to higher-potential node; primary current entry point during Zener operation

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive applications including engine control units and body electronics
±5 % Zener voltage tolerance	Cost-optimized regulation accuracy suitable for non-critical biasing and protection functions
Low thermal resistance (R_th(j-a) ≤ 500 K/W)	Enables adequate heat dissipation on standard single-sided FR4 PCB without heatsinking
Non-repetitive 40 W peak power capability	Supports transient voltage suppression in surge-prone interfaces like LIN bus or sensor lines
Marking code *T8	Enables visual identification on assembled PCBs and traceability to BZX84-C39 specification

Applications

Automotive Sensor Biasing	Industrial Power Supply Clamp
Use Scenario: Providing stable reference voltage for analog sensor signal conditioning in engine coolant temperature or manifold absolute pressure sensors. IC Role / Device Role / Timing Role: Shunt voltage reference regulating bias point for op-amp input stages and ADC reference dividers. Use Value: Maintains <±1 % output stability over -40 °C to +125 °C ambient due to AEC-Q101 qualification and controlled temperature coefficient.	Use Scenario: Clamping transient overvoltages on 24 V industrial PLC I/O lines exposed to inductive switching noise. IC Role / Device Role / Timing Role: Passive overvoltage protector absorbing short-duration energy spikes before they reach downstream logic. Use Value: Limits voltage to ≤41 V with 0.7 A peak surge current handling, preventing damage to 3.3 V/5 V interface ICs.
Consumer Device Battery Protection	Medical Instrument Reference
Use Scenario: Monitoring lithium-ion battery pack voltage in portable ultrasound or infusion pumps to prevent overcharge. IC Role / Device Role / Timing Role: Precision voltage threshold detector in discrete comparator-based cutoff circuitry. Use Value: Delivers repeatable 39 V trip point with ≤40 μA leakage at 29.4 V, minimizing standby current drain.	Use Scenario: Generating stable excitation voltage for precision resistive bridge sensors in patient monitoring equipment. IC Role / Device Role / Timing Role: Low-noise DC voltage reference source for instrumentation amplifier bias networks. Use Value: Achieves <0.5 % regulation error across operating temperature range, supporting <0.1 % system accuracy requirements.

Automotive Sensor Biasing

Industrial Power Supply Clamp

Use Scenario: Providing stable reference voltage for analog sensor signal conditioning in engine coolant temperature or manifold absolute pressure sensors.

IC Role / Device Role / Timing Role: Shunt voltage reference regulating bias point for op-amp input stages and ADC reference dividers.

Use Value: Maintains <±1 % output stability over -40 °C to +125 °C ambient due to AEC-Q101 qualification and controlled temperature coefficient.

Use Scenario: Clamping transient overvoltages on 24 V industrial PLC I/O lines exposed to inductive switching noise.

IC Role / Device Role / Timing Role: Passive overvoltage protector absorbing short-duration energy spikes before they reach downstream logic.

Use Value: Limits voltage to ≤41 V with 0.7 A peak surge current handling, preventing damage to 3.3 V/5 V interface ICs.

Consumer Device Battery Protection

Medical Instrument Reference

Use Scenario: Monitoring lithium-ion battery pack voltage in portable ultrasound or infusion pumps to prevent overcharge.

IC Role / Device Role / Timing Role: Precision voltage threshold detector in discrete comparator-based cutoff circuitry.

Use Value: Delivers repeatable 39 V trip point with ≤40 μA leakage at 29.4 V, minimizing standby current drain.

Use Scenario: Generating stable excitation voltage for precision resistive bridge sensors in patient monitoring equipment.

IC Role / Device Role / Timing Role: Low-noise DC voltage reference source for instrumentation amplifier bias networks.

Use Value: Achieves <0.5 % regulation error across operating temperature range, supporting <0.1 % system accuracy requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5242BS	39 V nominal, ±5 % tolerance, SOT-23 package, but rated for only 200 mW P_tot and lacks AEC-Q101 qualification	Restricted to commercial-grade consumer electronics; unsuitable for automotive or industrial environments requiring extended temperature or reliability validation	Select when cost sensitivity outweighs automotive qualification and 50 mW derating is acceptable in thermal design
Vishay BZX84-C39-TP	Identical 39 V ±5 % spec, SOT-23, AEC-Q101 qualified, but uses different marking (*T8 vs. "39") and has slightly higher typical r_diff (375 Ω vs. 350 Ω)	Functionally interchangeable in all BZX84-C39 designs; minor r_diff difference negligible in low-current bias applications	Preferred for second-source assurance where identical performance and qualification are required without layout change

Compared with MMBZ5242BS, BZX84-C39/LF1R delivers 25 % higher continuous power rating and automotive qualification; versus BZX84-C39-TP, it offers marginally lower dynamic impedance for tighter voltage regulation in precision analog circuits.

Availability

BZX84-C39/LF1R is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial power supply clamp, and consumer device battery protection requiring stable component supply and long-term lifecycle support.

Supply support for BZX84-C39/LF1R 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The BZX84 series is part of NXP's broad portfolio of discrete protection and regulation devices, designed specifically for cost-sensitive, space-constrained applications requiring reliable voltage reference or transient suppression in harsh environments.

FAQ

What is the Zener voltage tolerance of BZX84-C39/LF1R?

The BZX84-C39/LF1R has a nominal Zener voltage of 39 V with a tolerance of approximately ±5 %, meaning its actual breakdown voltage falls between 37.0 V and 41.0 V when tested at 2 mA. This tolerance band is confirmed in Table 9 of the NXP datasheet and applies specifically to the 'C' variant of the BZX84 series. The BZX84-C39/LF1R is not rated for tighter tolerances such as ±1 % or ±2 %.

Is BZX84-C39/LF1R qualified for automotive applications?

Yes, BZX84-C39/LF1R is AEC-Q101 qualified, as explicitly stated in Section 8.1 ("Quality information") of the NXP datasheet. This qualification confirms its suitability for automotive applications including engine control, body electronics, and infotainment systems. The BZX84-C39/LF1R undergoes stress testing per the AEC-Q101 standard for discrete semiconductors, covering temperature cycling, humidity, and high-temperature reverse bias.

What is the maximum non-repetitive peak reverse current for BZX84-C39/LF1R?

The BZX84-C39/LF1R supports a non-repetitive peak reverse current (I_ZSM) of 0.7 A for pulse durations ≤100 μs, as specified in Table 9 of the NXP datasheet. This value is measured under standardized surge conditions (square wave, T_j = 25 °C before surge) and defines the device's transient overvoltage clamping capability. Exceeding this current or duration risks permanent degradation.

How does the temperature coefficient affect BZX84-C39/LF1R performance?

The BZX84-C39/LF1R has a positive temperature coefficient ranging from +27.3 mV/K to +41.2 mV/K, meaning its Zener voltage increases linearly with junction temperature. This behavior is documented in Table 9 and impacts system-level voltage reference stability - for example, a 50 °C rise causes ~1.5–2.0 V increase in V_Z. Designers must account for this in thermal error budgets, especially in unregulated ambient environments.

What is the marking code for BZX84-C39/LF1R on the physical device?

The BZX84-C39/LF1R is marked with the code *T8 on its top surface, as listed in Table 4 ("Marking codes") of the NXP datasheet. The asterisk (*) serves as a placeholder for the manufacturing site code, while "T8" uniquely identifies the BZX84-C39 variant within the SOT23 package family. This marking enables visual verification and traceability during assembly and field service.

BZX84-C39/LF1R Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 39 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 90 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 27.3 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23 (TO-236AB)

BZX84-C39/LF1R FAQ

1.How can I place an order for BZX84-C39/LF1R through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-C39/LF1R on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BZX84-C39/LF1R reliable?

The price and inventory of BZX84-C39/LF1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C39/LF1R is usually 5 days.

3.What payment methods are accepted for BZX84-C39/LF1R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C39/LF1R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-C39/LF1R?

BZX84-C39/LF1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-C39/LF1R order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BZX84-C39/LF1R?

For technical support, including BZX84-C39/LF1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C39/LF1R requirements.

6.How does Aetrix verify that BZX84-C39/LF1R is sourced from the original manufacturer or authorized distributors?

All BZX84-C39/LF1R products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZX84-C39/LF1R meets industry standards.

7.What is the process for return or replacement of BZX84-C39/LF1R?

All BZX84-C39/LF1R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C39/LF1R, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BZX84-C39/LF1R part is unused and in its original packaging.

Return procedure for BZX84-C39/LF1R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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