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Nexperia USA Inc. BZX384-B51,115
- Part No.:
- BZX384-B51,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B51,115.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:1,677
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Product details
Overview
BZX384-B51,115 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 51 V nominal breakdown voltage at 5 mA, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power. It serves as a precision reference or overvoltage clamp in low-power analog supply rails and sensor interface circuits.
For engineers reviewing the BZX384-B51,115 datasheet, BZX384-B51,115 pinout, BZX384-B51,115 application, or BZX384-B51,115 equivalent, key selection criteria include its 51 V Zener voltage tolerance, thermal resistance (Rth(j-a) = 415 K/W), differential resistance (≤400 Ω), reverse current (≤0.2 μA at 38.3 V), and SOD323 footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its 51 V nominal Zener voltage is specified at IZ = 5 mA with ±2 % tolerance, and temperature coefficient is +0.05 mV/K - indicating minimal drift over temperature.
Designed for low-power regulation, it features 300 mW steady-state power dissipation on FR4 PCB with single-sided copper, and withstands 40 W non-repetitive surges (100 μs, square wave). Differential resistance of ≤400 Ω ensures tight regulation under small current variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 50.0 V to 52.0 V at IZ = 5 mA - defines precise clamping threshold for 51 V rail stabilization |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Differential Resistance (rdif) | ≤400 Ω at IZ = 5 mA - determines output impedance and regulation sensitivity to current changes |
| Reverse Current (IR) | ≤0.2 μA at VR = 38.3 V - ensures negligible leakage below breakdown, critical for low-power standby circuits |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - supports transient overvoltage suppression without failure |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - defines conduction loss when used in forward-biased protection paths |
| Junction Temperature (Tj) | −65 °C to +150 °C - enables operation in industrial ambient environments without derating |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm body size, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias anode-to-cathode voltage establishes Zener breakdown |
| 2 | Anode (A) | Connected to ground or lower-potential reference; completes bias path for regulation current flow |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation than ±5 % variants (BZX384-C51), reducing need for post-regulation trimming |
| Low differential resistance (≤400 Ω) | Minimizes output voltage shift under ±1 mA load variation - critical for precision reference buffering |
| 415 K/W junction-to-ambient thermal resistance | Allows direct thermal modeling on standard FR4 layout without heatsinking for <150 mW average dissipation |
| 0.2 μA max reverse leakage at 38.3 V | Preserves battery life in always-on sensor nodes where quiescent current must stay below 1 μA |
| SOD323 footprint compatibility | Supports automated placement and reflow in high-volume production with IPC-7351-compliant land patterns |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Protection |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 24-bit ADC front-end in temperature transmitters operating from 24 V loop-powered supplies. IC Role / Device Role / Timing Role: Zener shunt regulator providing 51 V reference for isolated DC-DC converter feedback network. Use Value: ±2 % tolerance and <0.2 μA leakage ensure <0.01 % full-scale error contribution and no impact on 4–20 mA loop compliance. |
Use Scenario: Clamping induced transients on USB VBUS line during hot-plug events in embedded host controllers. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between VBUS and GND, triggered only during >51 V surges. Use Value: 40 W peak power rating absorbs 100 μs ESD-like pulses without degradation, while SOD323 size fits tight board space near connector. |
| Programmable Logic Controller (PLC) Input Protection | Automotive Body Control Module (BCM) Reference |
|
Use Scenario: Protecting 24 V digital input channels against load dump and inductive kickback in factory automation I/O modules. IC Role / Device Role / Timing Role: Shunt limiter that conducts excess energy into series current-limiting resistor during overvoltage events. Use Value: 300 mW continuous rating allows sustained clamping during 100 ms load-dump pulses (ISO 7637-2 Pulse 1), avoiding thermal runaway. |
Use Scenario: Generating stable 51 V bias for high-side gate driver bootstrap circuit in 12 V automotive BCM motor drivers. IC Role / Device Role / Timing Role: Precision voltage reference enabling accurate high-side FET turn-on timing under battery voltage fluctuations. Use Value: +0.05 mV/K temperature coefficient limits drift to <0.75 V over −40 °C to +125 °C, maintaining gate drive margin. |
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 MMBZ5257BS | 51 V, ±5 % tolerance, SOD-323, 200 mW Ptot, rdif ≤ 500 Ω | Higher tolerance and lower power limit reduce accuracy and surge robustness in precision rails | Select when cost sensitivity outweighs regulation stability requirements |
| Vishay BZX384-B51-E3-08 | Identical 51 V ±2 % spec, same SOD323 package, but RoHS-compliant matte tin termination vs. Nexperia's standard finish | No functional difference; suitable for lead-free assembly where termination chemistry affects solder joint reliability | Choose for strict RoHS/REACH compliance programs requiring verified matte tin plating |
Compared with MMBZ5257BS, BZX384-B51,115 delivers tighter voltage control and higher surge resilience; versus BZX384-B51-E3-08, it offers identical electrical performance with standard termination - making it optimal for general-purpose industrial designs where process compatibility is prioritized over specialized plating.
Availability
BZX384-B51,115 is available at Aetrix Electronics and suitable for industrial sensor interfaces, PLC input protection, and USB port transient suppression requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for BZX384-B51,115 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 focused on high-volume, high-reliability logic, discrete, and MOSFET solutions, with manufacturing rooted in process optimization and automotive-grade quality systems.
The BZX384 series belongs to Nexperia's precision Zener regulator portfolio, engineered specifically for low-power voltage reference and overvoltage protection in space-constrained industrial and consumer electronics.
FAQ
What is the maximum reverse voltage before breakdown for BZX384-B51,115?
The BZX384-B51,115 exhibits sharp Zener breakdown at 50.0 V minimum and 52.0 V maximum when tested at IZ = 5 mA. Below 38.3 V, reverse current remains ≤0.2 μA - confirming stable non-conducting behavior up to 75 % of nominal VZ.
Can BZX384-B51,115 be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and parameter spread; paralleling causes current hogging and thermal runaway. For >300 mW needs, use a single higher-rated device like PZM5100A or add external series pass transistor.
Is BZX384-B51,115 qualified for automotive applications?
No - this variant is non-automotive qualified per Nexperia's documentation. Automotive-grade equivalents (e.g., BZX384-B51-Q) undergo AEC-Q101 stress testing and have separate part numbering; BZX384-B51,115 is intended for industrial and commercial use only.
What is the recommended PCB footprint for reliable reflow soldering?
The official Nexperia SOD323 reflow footprint specifies 0.5 mm pad width × 1.15 mm length, 0.6 mm solder mask opening, and 0.4 mm solder paste stencil aperture - ensuring coplanarity, void-free joints, and mechanical strength per IPC-7351B density level N.
BZX384-B51,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-B51,115 FAQ
1.How can I place an order for BZX384-B51,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B51,115 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 BZX384-B51,115 reliable?
The price and inventory of BZX384-B51,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-B51,115 is usually 5 days.
3.What payment methods are accepted for BZX384-B51,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B51,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B51,115?
BZX384-B51,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B51,115 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 BZX384-B51,115?
For technical support, including BZX384-B51,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B51,115 requirements.
6.How does Aetrix verify that BZX384-B51,115 is sourced from the original manufacturer or authorized distributors?
All BZX384-B51,115 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 BZX384-B51,115 meets industry standards.
7.What is the process for return or replacement of BZX384-B51,115?
All BZX384-B51,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B51,115, 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 BZX384-B51,115 part is unused and in its original packaging.
Return procedure for BZX384-B51,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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