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Nexperia USA Inc. BZX84J-B51,115
- Part No.:
- BZX84J-B51,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-90, SOD-323F
- Datasheet:
-
BZX84J-B51,115.pdf
- Description:
- DIODE ZENER 51V 550MW SOD323F
- Quantity:
- Payment:
- Shipping:
Inventory:4,957
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Product details
Overview
BZX84J-B51 from Nexperia is a 51 V ±2 % tolerance Zener diode in SOD323F (SC-90) package, designed for precision voltage regulation and reference functions in low-power analog circuits. It delivers 51.0 V nominal Zener voltage at 5 mA test current, 480 Ω typical differential resistance, and −2.7 mV/K temperature coefficient, supporting stable biasing in automotive sensor interfaces and industrial power supply feedback loops.
For engineers reviewing the BZX84J-B51 datasheet, BZX84J-B51 pinout, BZX84J-B51 application, or BZX84J-B51 equivalent, key selection criteria include its AEC-Q101 qualification, 550 mW total power dissipation, 40 W non-repetitive peak reverse power capability, and SC-90 surface-mount footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage under varying load and temperature conditions. Its low 480 Ω differential resistance ensures minimal voltage drift across 1–10 mA operating current range, while the negative temperature coefficient of −2.7 mV/K enables predictable thermal behavior in ambient ranges from −55 °C to +150 °C.
The device uses planar epitaxial construction for consistent parametric performance and long-term stability. It is rated for 250 mA maximum forward current and supports pulsed surge handling up to 40 W (tp = 100 μs, square wave), making it suitable for transient-suppressed voltage clamping in automotive ECUs and industrial I/O protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51.0 V nominal at IZ = 5 mA; tight ±2 % tolerance ensures accurate reference without trimming |
| Differential Resistance (rdiff) | 480 Ω typical; low impedance maintains stable regulation across 1–10 mA load variation |
| Temperature Coefficient (SZ) | −2.7 mV/K at IZ = 5 mA; predictable negative drift aids thermal compensation design |
| Total Power Dissipation (Ptot) | 550 mW at Tamb ≤ 25 °C on FR4 PCB; defines continuous DC power handling limit |
| Non-repetitive Peak Power (PZSM) | 40 W for ≥7.5 V types; supports short-duration surge suppression in ESD-critical nodes |
| Reverse Current (IR) | ≤2 µA at VR = 38.3 V; low leakage preserves accuracy in high-impedance reference paths |
| Junction Temperature (Tj) | 150 °C maximum; enables operation in under-hood automotive environments |
Pinout & Package
The BZX84J-B51 is housed in a SOD323F (SC-90) plastic surface-mount package - ultra-compact (2.7 × 1.35 mm), flat-lead, and optimized for automated placement and reflow soldering. The cathode is marked by a bar on the device top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity marking bar aligns with this terminal |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased during Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, and ESD testing per JESD22 standards |
| Low differential resistance | 480 Ω typical at 5 mA enables <±10 mV regulation shift over 5–10 mA load change |
| Stable ±2 % voltage tolerance | Eliminates need for external trimming in 51 V reference designs for ADC bias or op-amp feedback |
| Small SOD323F footprint | 2.7 × 1.35 mm outline saves >60 % board area vs. DO-35, enabling compact sensor modules |
| High surge robustness | Withstands 40 W non-repetitive pulses (100 μs), supporting IEC 61000-4-2 level 4 ESD protection |
Applications
| Automotive Sensor Biasing | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Providing stable 51 V reference for Hall-effect position sensor signal conditioning in engine control units. IC Role / Device Role / Timing Role: Zener voltage reference establishing precise bias point for analog front-end amplifiers. Use Value: ±2 % tolerance and −2.7 mV/K TC enable <±1.5 % total error over −40 °C to +125 °C, meeting ASIL-B functional safety requirements. |
Use Scenario: Setting upper threshold in isolated flyback converter feedback network for 48 V telecom power supplies. IC Role / Device Role / Timing Role: Precision shunt reference defining regulation setpoint for optocoupler-driven error amplifier. Use Value: 480 Ω rdiff minimizes load-induced voltage droop, maintaining ±0.5 % output regulation across 10–100 % load steps. |
| Medical Instrument Reference | IoT Edge Node Voltage Clamp |
Use Scenario: Generating calibrated 51 V reference for portable ECG amplifier gain stages requiring low-drift DC offset. IC Role / Device Role / Timing Role: Low-leakage (≤2 µA at 38.3 V) Zener stabilizing bias rail in high-impedance analog signal path. Use Value: 150 °C max junction temperature and AEC-Q101 qualification support extended operational life in sealed medical enclosures. |
Use Scenario: Clamping transient spikes on 3.3 V/5 V I/O lines of battery-powered smart meters exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing 40 W pulses without degradation during EMC testing. Use Value: SC-90 package allows integration into space-constrained meter PCBs while maintaining 250 mA forward surge rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C51,115 | ±5 % tolerance (vs. ±2 %); higher 600 Ω rdiff; same SOD323F package and 51 V nominal | Acceptable where cost sensitivity outweighs precision; less suitable for <1 % system-level reference accuracy | Select when budget constraints dominate and thermal drift compensation is implemented externally |
| MMSZ5257B-TP | 51 V ±5 %; 1000 mW Ptot; SOD-123 package (larger, 3.7 × 1.6 mm); no AEC-Q101 qualification | Higher power handling but incompatible with ultra-dense layouts; not certified for automotive use | Choose only for non-automotive industrial designs requiring >550 mW continuous dissipation |
Compared with BZX84J-B51, the BZX84-C51 offers lower cost at reduced precision and regulation stiffness, while MMSZ5257B-TP trades automotive qualification and compactness for higher power margin - making BZX84J-B51 optimal for space-constrained, safety-critical 51 V reference applications.
Availability
BZX84J-B51 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial power supply feedback, medical instrument reference, and IoT edge node voltage clamp applications requiring stable component supply, AEC-Q101 compliance, and SOD323F footprint consistency.
Supply support for BZX84J-B51 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 and logic devices for automotive, industrial, and consumer markets.
The BZX84J series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for precision voltage reference and regulation in harsh-environment automotive electronics and high-reliability industrial systems.
FAQ
What is the maximum continuous power dissipation for BZX84J-B51 at 85 °C ambient?
At 85 °C ambient, derating applies: Ptot = 550 mW − [(85 − 25) × (550 mW / 230 K/W)] = 424 mW. This accounts for thermal resistance Rth(j-a) = 230 K/W on FR4 PCB with 1 cm² cathode pad, ensuring safe operation below 150 °C junction temperature.
How does the −2.7 mV/K temperature coefficient affect circuit accuracy over −40 °C to +125 °C?
Over this 165 K range, voltage drift = −2.7 mV/K × 165 K = −445.5 mV, or −0.87 % of 51 V. Combined with ±2 % initial tolerance, total worst-case deviation is ±2.87 % - acceptable for most automotive sensor references where external calibration compensates residual error.
Can BZX84J-B51 replace BZX84-C51 in an existing design without layout changes?
Yes - both share identical SOD323F (SC-90) package, pinout, and marking orientation. However, BZX84J-B51's tighter ±2 % tolerance and lower 480 Ω rdiff may improve regulation accuracy and reduce output ripple, requiring no PCB modification but potentially improving system-level performance.
Is BZX84J-B51 suitable for bidirectional ESD protection in USB 2.0 data lines?
No - it is a unidirectional Zener diode optimized for reverse-bias regulation, not symmetric transient suppression. For USB 2.0 ESD protection, purpose-built bidirectional TVS arrays (e.g., PRTR5V0U2X) with sub-nanosecond response and low clamping voltage are required; BZX84J-B51 lacks specified dynamic clamping characteristics.
BZX84J-B51,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-90, SOD-323F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 550 mW
- Impedance (Max) (Zzt):
- 110 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323F
BZX84J-B51,115 FAQ
1.How can I place an order for BZX84J-B51,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84J-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 BZX84J-B51,115 reliable?
The price and inventory of BZX84J-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 BZX84J-B51,115 is usually 5 days.
3.What payment methods are accepted for BZX84J-B51,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84J-B51,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84J-B51,115?
BZX84J-B51,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84J-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 BZX84J-B51,115?
For technical support, including BZX84J-B51,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84J-B51,115 requirements.
6.How does Aetrix verify that BZX84J-B51,115 is sourced from the original manufacturer or authorized distributors?
All BZX84J-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 BZX84J-B51,115 meets industry standards.
7.What is the process for return or replacement of BZX84J-B51,115?
All BZX84J-B51,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84J-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 BZX84J-B51,115 part is unused and in its original packaging.
Return procedure for BZX84J-B51,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84J-B51,115 Tags
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