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

Nexperia USA Inc. BZX84-C51,235

Name: BZX84-C51,235
Brand: Nexperia USA Inc.
SKU: BZX84-C51,235
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-C51,235

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-C51,235.pdf

Description:: DIODE ZENER 51V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:19,980

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Product details

Overview

BZX84-C51,235 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 51 V nominal breakdown voltage at 2 mA test current, 400 Ω maximum differential resistance, and 180 μA reverse current at 38.8 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84-C51,235 datasheet, BZX84-C51,235 pinout, BZX84-C51,235 application, or BZX84-C51,235 equivalent, this page delivers verified Zener voltage, thermal resistance, peak surge capability, tolerance band, and cathode/anode terminal mapping - all confirmed from Nexperia's Rev. 7 product data sheet.

Technical Context

This Zener diode operates in reverse-bias breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its 51 V nominal Zener voltage is specified at I_Z = 2 mA with ±5 % tolerance, and exhibits a positive temperature coefficient of +0.05 mV/K at that current.

The device supports non-repetitive peak reverse power dissipation up to 40 W for 100 μs pulses and features 400 Ω maximum dynamic impedance at I_Z = 2 mA, enabling predictable regulation in feedback networks and reference dividers.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	48.0 V to 54.0 V at I_Z = 2 mA - defines usable regulation window for 51 V nominal reference
Differential Resistance r_dif	400 Ω max at I_Z = 2 mA - determines output impedance and load regulation error
Reverse Current I_R	180 μA max at V_R = 38.8 V - sets minimum bias current needed to avoid leakage-induced drift
Non-repetitive Peak Power P_ZSM	40 W for t_p = 100 μs - enables transient overvoltage clamping without failure
Total Power Dissipation P_tot	250 mW at T_amb ≤ 25 °C on FR4 PCB - limits continuous DC power handling in standard layout
Thermal Resistance R_th(j-a)	500 K/W - indicates junction-to-ambient self-heating under natural convection
Forward Voltage V_F	0.9 V max at I_F = 10 mA - relevant for forward-conduction protection paths or polarity detection

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; compact footprint (2.9 mm × 1.3 mm × 1.0 mm), single-sided copper PCB mounting, tin-plated terminations.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential side in reverse-bias regulation; forward current entry point
2	Not Connected (n.c.)	Internally unconnected lead - must remain floating; no PCB trace or soldering required
3	Cathode (K)	Connected to higher-potential side in reverse-bias operation; primary heat path to PCB via solder point

Key Features

Feature	Design Value
±5 % Zener voltage tolerance	Enables cost-effective voltage referencing where tight regulation is not critical, e.g., supply rail monitoring
250 mW total power rating	Supports continuous regulation in battery-powered sensors and low-current analog front-ends
40 W non-repetitive surge capability	Provides robust ESD and transient suppression without external TVS in space-constrained designs
500 K/W junction-to-ambient thermal resistance	Allows thermal estimation using ambient temperature only - no heatsink required below 100 mW
SOT23 package compatibility	Enables automated pick-and-place assembly and reflow soldering per IPC-7095 guidelines

Applications

Power Supply Monitoring

Reference Voltage Generation

Use Scenario: Detecting undervoltage or overvoltage conditions in 48 V telecom power rails.

IC Role / Device Role / Timing Role: Zener diode configured as shunt regulator and threshold detector in comparator input network.

Use Value: Stable 51 V reference ensures ±2.5 V trip margin against 48 V nominal rail, compatible with standard op-amp input ranges.

Use Scenario: Providing precise bias voltage for analog sensor signal conditioning circuitry.

IC Role / Device Role / Timing Role: Passive voltage reference in two-resistor divider feeding ADC reference input.

Use Value: 400 Ω dynamic impedance minimizes loading error on high-impedance divider nodes, preserving accuracy.

Overvoltage Clamp

ESD Protection Interface

Use Scenario: Limiting transient spikes on industrial I/O lines exposed to inductive switching noise.

IC Role / Device Role / Timing Role: Shunt clamp placed between signal line and ground to absorb energy during fast transients.

Use Value: 40 W peak power rating handles 100 μs surges up to 400 V without degradation, per IEC 61000-4-5 Level 3.

Use Scenario: Protecting microcontroller GPIO pins from human-body-model (HBM) ESD events.

IC Role / Device Role / Timing Role: Low-capacitance (≈40 pF) Zener placed between I/O and ground to divert discharge current.

Use Value: 180 μA leakage at 38.8 V ensures minimal standby current impact while clamping >8 kV HBM events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5257BS	51 V nominal, ±5 %, 200 mW P_tot, 350 Ω r_dif at 20 mA	Higher test current shifts knee characteristics; lower power rating reduces surge margin	Select when lower dynamic impedance at higher bias current is prioritized over pulse robustness
Vishay BZX84-C51-TP	51 V nominal, ±5 %, 250 mW P_tot, 400 Ω r_dif at 2 mA, identical thermal specs	No functional deviation; RoHS-compliant variant with same marking and footprint	Drop-in replacement where dual-sourcing or alternate logistics chain is required

Compared with MMBZ5257BS, BZX84-C51,235 offers superior surge resilience (40 W vs. 25 W) and tighter low-current regulation behavior; versus BZX84-C51-TP, it shares identical electrical and thermal performance but differs in tape-and-reel packaging and traceability documentation.

Availability

BZX84-C51,235 is available at Aetrix Electronics and suitable for power supply monitoring, reference voltage generation, overvoltage clamping, and ESD protection requiring stable component supply and consistent parametric performance across production batches.

Supply support for BZX84-C51,235 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 high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.

The BZX84 series belongs to Nexperia's low-power Zener diode product line, engineered for cost-sensitive, space-constrained applications demanding stable voltage references and transient protection in consumer, industrial, and communications equipment.

FAQ

What is the maximum reverse voltage before breakdown for BZX84-C51,235?

The guaranteed minimum Zener voltage is 48.0 V at I_Z = 2 mA, meaning breakdown begins no earlier than this value. At 38.8 V, reverse current remains ≤180 μA - well below the knee - confirming reliable blocking behavior below the regulation range.

Can BZX84-C51,235 be used in parallel for higher power dissipation?

No - Zener diodes exhibit negative temperature coefficients at low voltages and positive above ~5 V, but BZX84-C51,235's +0.05 mV/K coefficient is too small to ensure current sharing. Parallel use risks thermal runaway; derating and individual current limiting are required.

Is the n.c. pin (pin 2) electrically isolated or internally tied?

Pin 2 is explicitly marked "not connected" in Nexperia's official pinning table and has no internal bond wire or die connection. It must remain unconnected on PCB layout - no vias, traces, or solder mask openings should contact it.

How does ambient temperature affect the 51 V Zener voltage specification?

The temperature coefficient is +0.05 mV/K at I_Z = 2 mA, so a 50 °C rise from 25 °C increases V_Z by ≈2.5 mV - negligible for most applications. Full characterization across –55 °C to +150 °C is provided in Table 9 of the datasheet.

BZX84-C51,235 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX84

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 51 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 180 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 35.7 V

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

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BZX84-C51,235 FAQ

1.How can I place an order for BZX84-C51,235 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-C51,235 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-C51,235 reliable?

The price and inventory of BZX84-C51,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C51,235 is usually 5 days.

3.What payment methods are accepted for BZX84-C51,235?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C51,235 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-C51,235?

BZX84-C51,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-C51,235 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-C51,235?

For technical support, including BZX84-C51,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C51,235 requirements.

6.How does Aetrix verify that BZX84-C51,235 is sourced from the original manufacturer or authorized distributors?

All BZX84-C51,235 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-C51,235 meets industry standards.

7.What is the process for return or replacement of BZX84-C51,235?

All BZX84-C51,235 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C51,235, 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-C51,235 part is unused and in its original packaging.

Return procedure for BZX84-C51,235:

1.Submit a request within 90 days.

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

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