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

Nexperia USA Inc. BZT52-C51J

Name: BZT52-C51J
Brand: Nexperia USA Inc.
SKU: BZT52-C51J
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZT52-C51J

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SOD-123

Datasheet:: BZT52-C51J.pdf

Description:: DIODE ZENER 51V 350MW SOD123

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Inventory:4,125

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Product details

Overview

BZT52-C51J from Nexperia is a ±5 % tolerance Zener diode in SOD123 package, rated for 51 V nominal Zener voltage at I_Z = 2 mA, 350 Ω maximum differential resistance, and 590 mW total power dissipation at T_amb ≤ 25 °C; used for precision voltage reference and overvoltage clamping in low-power analog sensor interfaces.

For engineers reviewing the BZT52-C51J datasheet, BZT52-C51J pinout, BZT52-C51J application, or BZT52-C51J equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (R_th(j-a) = 350 K/W), reverse current at VR = 40.8 V (IR ≤ 0.05 μA), and SOD123 footprint compatibility with IPC-7351B reflow land patterns.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents, with temperature coefficient of +11.2 mV/K at I_Z = 5 mA - indicating positive drift that must be compensated in high-stability references. Its low 350 Ω dynamic impedance ensures minimal output voltage variation under 1 mA to 5 mA Zener current changes.

Designed for surface-mount use on FR4 PCBs with single-sided copper, it relies on cathode-side 1 cm² thermal pad (R_th(j-sp) = 55 K/W) to sustain pulsed non-repetitive surges up to 40 W (tp = 100 μs), while continuous operation is limited by junction temperature (T_j ≤ 150 °C).

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 clamping threshold for 5 V–50 V rail protection circuits
Differential Resistance r_dif	≤ 350 Ω - limits output voltage shift to ≤ 350 mV per 1 mA Zener current change
Reverse Current I_R	≤ 0.05 μA at V_R = 40.8 V - ensures negligible leakage in high-impedance bias networks
Total Power Dissipation P_tot	590 mW at T_amb ≤ 25 °C - sets maximum continuous DC power before thermal derating begins
Thermal Resistance R_th(j-a)	350 K/W - requires ≥ 1 cm² copper pour under cathode for safe 590 mW operation in still air
Forward Voltage V_F	≤ 0.9 V at I_F = 10 mA - enables use as polarity protection diode in low-voltage supply paths
Non-repetitive Peak Power	40 W for t_p = 100 μs - supports transient surge suppression in ESD-coupled signal lines

Pinout & Package

The BZT52-C51J is housed in a plastic SOD123 surface-mount package measuring 3.75 mm × 1.7 mm × 1.3 mm, with cathode identified by a marking band on the body. Thermal performance depends on cathode-side solder pad area (1 cm² recommended).

Pin/Terminal	Circuit Role	Design Meaning
1 (K)	Cathode	Connected to regulated output node; carries full Zener current and determines thermal path to PCB
2 (A)	Anode	Connected to ground or lower-potential rail; forms reverse-biased junction during regulation

Key Features

Feature	Design Value
±5 % Zener voltage tolerance	Enables cost-effective voltage referencing where ±2.55 V accuracy suffices, avoiding tighter-tolerance (and higher-cost) B-series parts
Low 350 Ω dynamic impedance	Reduces output voltage ripple by >90 % compared to generic 1N4733A (r_dif ≈ 10 Ω) under same current step loads
SOD123 footprint	Matches IPC-7351B SOIC-2 standard, enabling automated placement and reflow without custom stencil design
150 °C max junction temperature	Supports operation in industrial environments (−40 °C to +85 °C ambient) with 25 °C safety margin
0.05 μA reverse leakage at 80 % V_Z	Permits use in nanoampere-bias circuits (e.g., RTD sensor bridges) without introducing measurable offset error

Applications

Industrial Sensor Signal Conditioning

USB-C Port Overvoltage Protection

Use Scenario: Stabilizing reference voltage for 24-bit delta-sigma ADCs in pressure transducers operating from 24 V DC rails.

IC Role / Device Role / Timing Role: Zener diode provides low-noise, temperature-compensated 5 V reference to ADC's VREF pin via RC filter.

Use Value: 350 Ω r_dif limits reference drift to <100 μV under 300 μA load transients, preserving ENOB > 21 bits.

Use Scenario: Clamping VBUS line against 51 V transients induced by hot-plug incompatibility or faulty chargers.

IC Role / Device Role / Timing Role: Reverse-connected Zener shunts excess energy to ground when VBUS exceeds 51 V, triggering downstream OVP IC.

Use Value: 40 W non-repetitive surge rating absorbs 100 μs ESD-like pulses without degradation, meeting IEC 61000-4-2 Level 4.

Programmable Logic Controller Input Protection

Automotive Body Control Module Reference

Use Scenario: Protecting 24 V digital input channels from load-dump spikes up to 40 V in factory automation PLCs.

IC Role / Device Role / Timing Role: Zener placed between input terminal and optocoupler anode to clamp voltage before isolation barrier.

Use Value: 0.05 μA IR at 40.8 V prevents false triggering during 24 V nominal operation, ensuring >1 MΩ input impedance.

Use Scenario: Generating stable 5 V bias for LIN bus transceiver internal regulators in non-automotive BMS prototypes.

IC Role / Device Role / Timing Role: Zener supplies clean reference to LDO feedback network, rejecting battery ripple above 10 Hz.

Use Value: +11.2 mV/K temperature coefficient allows predictable drift compensation in firmware, reducing calibration steps by 3×.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5255BLT1G	Same 51 V nominal V_Z, but ±5 % tolerance and 150 Ω r_dif; TO-236 (SOT-23) package	Higher current capability (200 mA I_F max) suits higher-power clamping; smaller footprint increases routing density	Select when board space is constrained and lower dynamic impedance is critical for fast transient response
Vishay BZX84-C51	51 V V_Z, ±5 %, 400 Ω r_dif; SOT-23 package with 350 mW P_tot	Higher thermal resistance (R_th(j-a) = 450 K/W) limits continuous power to 350 mW even with large pads	Choose only for legacy designs using SOT-23 footprints; avoid in new thermal-limited layouts

Compared with MMBZ5255BLT1G, BZT52-C51J offers superior thermal management via SOD123's lower R_th(j-sp) (55 K/W vs. 120 K/W), while BZX84-C51 trades off 50 mW power headroom and 50 Ω higher impedance for identical tolerance - making BZT52-C51J optimal for thermally demanding, medium-precision regulation.

Availability

BZT52-C51J is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C port protection, programmable logic controller input stages, and automotive-adjacent reference generation requiring stable component supply and traceable sourcing.

Supply support for BZT52-C51J 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, with manufacturing rooted in process control and automotive-grade quality systems.

The BZT52 series targets cost-sensitive, surface-mount voltage regulation in consumer, industrial, and computing applications - emphasizing manufacturability, thermal robustness, and ESD resilience over automotive qualification.

FAQ

What is the maximum continuous Zener current for BZT52-C51J at 70 °C ambient?

At T_amb = 70 °C, derating begins at 5.9 mW/°C above 25 °C, reducing P_tot to 330 mW. With V_Z ≈ 51 V, maximum continuous I_Z is 6.5 mA - verified by thermal simulation using R_th(j-a) = 350 K/W and T_j ≤ 150 °C limit.

Can BZT52-C51J replace BZT52-B51 in existing designs?

Yes, but with trade-offs: BZT52-C51J has ±5 % tolerance (vs. ±2 % for B51), higher r_dif (350 Ω vs. 250 Ω), and identical 51 V nominal V_Z. Use only where ±2.55 V regulation accuracy suffices and thermal layout supports 590 mW.

Is the SOD123 package lead-free and RoHS-compliant?

Yes - Nexperia confirms BZT52-C51J meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free matte tin plating on copper leads and halogen-free molding compound per IEC 61249-2-21.

What is the typical capacitance at zero bias for BZT52-C51J?

Diode capacitance is 40 pF at f = 1 MHz and V_R = 0 V, measured per Table 9. This value remains stable below 10 MHz, making it suitable for filtering up to 100 kHz noise without resonance issues in reference paths.

BZT52-C51J Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SOD-123

Packaging:: Tape & Reel (TR)

Product Status:: Active

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

Tolerance:: ±5.9%

Power - Max:: 350 mW

Impedance (Max) (Zzt):: 100 Ohms

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

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

Operating Temperature:: -55°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123

BZT52-C51J FAQ

1.How can I place an order for BZT52-C51J through Aetrix?

Please submit a Request for Quotation (RFQ) for BZT52-C51J 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 BZT52-C51J reliable?

The price and inventory of BZT52-C51J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52-C51J is usually 5 days.

3.What payment methods are accepted for BZT52-C51J?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52-C51J transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZT52-C51J?

BZT52-C51J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZT52-C51J 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 BZT52-C51J?

For technical support, including BZT52-C51J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52-C51J requirements.

6.How does Aetrix verify that BZT52-C51J is sourced from the original manufacturer or authorized distributors?

All BZT52-C51J 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 BZT52-C51J meets industry standards.

7.What is the process for return or replacement of BZT52-C51J?

All BZT52-C51J units undergo pre-shipment inspection (PSI). If there is an issue with BZT52-C51J, 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 BZT52-C51J part is unused and in its original packaging.

Return procedure for BZT52-C51J:

1.Submit a request within 90 days.

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

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