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Nexperia USA Inc. BZX84W-B68F
- Part No.:
- BZX84W-B68F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B68F.pdf
- Description:
- DIODE ZENER 68V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,861
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Product details
Overview
BZX84W-B68F from Nexperia is a ±2 % tolerance Zener voltage regulator diode with a nominal breakdown voltage of 68 V, housed in an SOT323 (SC-70) surface-mount package. It delivers 275 mW total power dissipation at 25 °C ambient, exhibits 475 Ω typical differential resistance at 2 mA, and maintains stable regulation in high-frequency signal conditioning and low-power reference circuits.
For engineers reviewing the BZX84W-B68F datasheet, BZX84W-B68F pinout, BZX84W-B68F application, or BZX84W-B68F equivalent, this part supports precision voltage clamping in analog front-ends, overvoltage protection for microcontroller I/O, and stable biasing in RF amplifier stages where tight Zener tolerance and low capacitance (0.25 pF at 1 MHz) are critical.
Technical Context
This Zener diode operates in reverse-biased avalanche mode to maintain a stable 68 V reference across its cathode–anode terminals under controlled current conditions. Its ±2 % tolerance ensures predictable clamping thresholds in safety-critical overvoltage detection circuits.
Designed for SMT assembly on FR4 PCBs with single-sided copper, it achieves a junction-to-ambient thermal resistance of 455 K/W and supports non-repetitive peak reverse power dissipation up to 40 W for pulse durations ≤100 µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V nominal, ±2 % tolerance - defines precise clamping threshold for 68 V rail protection |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C - limits continuous DC power handling on standard FR4 layout |
| Differential Resistance (rdif) | 475 Ω max at IZ = 2 mA - determines output impedance and regulation sensitivity to load current changes |
| Junction Temperature (Tj) | 150 °C maximum - sets upper thermal limit for reliable long-term operation |
| Reverse Leakage (IR) | 50 nA max at VR = 0.7 × VZnom - ensures minimal standby current in high-impedance bias networks |
| Diode Capacitance (Cd) | 0.25 pF at f = 1 MHz, VR = 0 V - enables use in >100 MHz signal path clamping without parasitic loading |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - defines forward conduction loss when used bidirectionally or in series configurations |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; dimensions per IEC JEDEC outline: 2.2 mm × 1.35 mm × 0.95 mm height; 0.65 mm pitch; tin-plated terminations compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node during Zener operation |
| 2 | Not Connected (n.c.) | Electrically isolated terminal; no internal bond wire or die connection - must remain unconnected in PCB layout |
| 3 | Cathode (K) | Reverse-bias terminal; connected to higher-potential node to enable Zener breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables accurate 68 V threshold setting without post-production trimming in voltage monitor IC inputs |
| 0.25 pF junction capacitance | Minimizes signal distortion in RF detector and fast transient clamp applications up to 1 GHz |
| 455 K/W thermal resistance (j-a) | Allows direct thermal modeling on standard FR4 boards without heatsinking for <100 mW average loads |
| Non-repetitive 40 W surge rating | Withstands ESD events per IEC 61000-4-2 Level 4 (8 kV contact) when properly decoupled |
| SOT323 footprint compatibility | Supports automated placement with 0402-class pick-and-place equipment and standard reflow soldering |
Applications
| Overvoltage Protection for MCU GPIO | Low-Power Reference Voltage Source |
|---|---|
|
Use Scenario: Clamping 3.3 V or 5 V microcontroller input pins against transient surges from relay coils or inductive sensors. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy to ground before MCU input damage occurs. Use Value: 68 V standoff prevents false triggering during normal operation while enabling robust 8 kV ESD immunity via coordinated RC filtering. |
Use Scenario: Generating a stable 68 V bias for high-voltage op-amp feedback networks or photomultiplier tube gain control. IC Role / Device Role / Timing Role: Precision voltage reference element providing fixed potential with minimal temperature drift (SZ = 71.7 mV/K at IZ = 2 mA). Use Value: ±2 % tolerance eliminates need for external trimming resistors in calibration-sensitive instrumentation front-ends. |
| RF Signal Limiter Stage | Industrial Sensor Excitation Supply |
|
Use Scenario: Limiting RF signal amplitude in 433 MHz ISM band receiver front-ends to prevent LNA saturation. IC Role / Device Role / Timing Role: Fast-reacting shunt limiter exploiting low 0.25 pF capacitance and sub-nanosecond response time. Use Value: Near-zero parasitic capacitance preserves signal integrity and group delay flatness above 500 MHz. |
Use Scenario: Providing regulated excitation voltage to piezoresistive pressure sensors requiring stable 60–70 V bias in harsh industrial environments. IC Role / Device Role / Timing Role: Primary voltage regulation device in discrete high-voltage linear supply stage. Use Value: 150 °C max junction temperature rating supports operation in enclosures exceeding 85 °C ambient without derating. |
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 MMBZ5263B | 68 V, ±5 % tolerance; 350 mW Ptot; SOT23 package; 100 Ω rdif | Higher power but looser tolerance; larger footprint requires PCB redesign | Select when higher surge margin is needed and ±5 % regulation accuracy is acceptable |
| Vishay BZX84-C68 | 68 V, ±5 % tolerance; 300 mW Ptot; same SOT323 package; 500 Ω rdif | Same footprint but wider tolerance; higher leakage (100 nA vs. 50 nA) | Choose for cost-sensitive designs where ±5 % voltage variation is permissible |
Compared with BZX84W-B68F, MMBZ5263B offers higher power and lower dynamic impedance but sacrifices tolerance and package size; BZX84-C68 matches the SOT323 footprint but trades regulation precision and leakage performance for lower unit cost.
Availability
BZX84W-B68F is available at Aetrix Electronics and suitable for overvoltage protection, precision reference generation, and RF limiting applications requiring stable component supply, consistent parametric performance, and full traceability across production batches.
Supply support for BZX84W-B68F 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 specializing in high-performance logic, analog, and discrete components, with manufacturing rooted in process technology leadership and automotive-grade reliability standards.
BZX84W belongs to Nexperia's general-purpose Zener diode product line, engineered for stable voltage regulation in space-constrained, high-frequency, and thermally demanding applications across industrial and consumer electronics.
FAQ
What is the maximum continuous reverse current for BZX84W-B68F at 25 °C?
The device does not specify a maximum continuous reverse current; instead, its safe operating area is defined by total power dissipation (275 mW at 25 °C ambient). At 68 V Zener voltage, this corresponds to approximately 4.04 mA continuous reverse current before thermal derating applies. Exceeding this value risks junction overheating and permanent degradation.
Can BZX84W-B68F be used in bidirectional ESD protection configurations?
No - BZX84W-B68F is a unidirectional Zener diode with an isolated second terminal (pin 2, n.c.). It lacks symmetrical breakdown characteristics and cannot function as a bidirectional TVS. For bidirectional protection, discrete back-to-back Zener pairs or purpose-built TVS diodes such as PESD5V0S1BA must be used.
How does the 0.25 pF junction capacitance impact high-frequency circuit design?
This ultra-low capacitance minimizes signal attenuation and phase shift in RF paths up to 1 GHz, making the diode suitable for limiter stages in UHF receivers and fast transient suppressors in clock distribution networks. It avoids resonance issues with typical 50 Ω source impedances and preserves rise times below 35 ps.
Is the "n.c." pin electrically isolated or internally tied to substrate?
Pin 2 is fully unconnected - no internal bond wire, die attachment, or metallization links it to the silicon die or package substrate. Layout guidelines require leaving this pad floating or omitting solder paste; connecting it risks mechanical stress or unintended parasitic coupling in high-density layouts.
BZX84W-B68F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B68F FAQ
1.How can I place an order for BZX84W-B68F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B68F 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 BZX84W-B68F reliable?
The price and inventory of BZX84W-B68F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B68F is usually 5 days.
3.What payment methods are accepted for BZX84W-B68F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B68F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B68F?
BZX84W-B68F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B68F 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 BZX84W-B68F?
For technical support, including BZX84W-B68F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B68F requirements.
6.How does Aetrix verify that BZX84W-B68F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B68F 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 BZX84W-B68F meets industry standards.
7.What is the process for return or replacement of BZX84W-B68F?
All BZX84W-B68F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B68F, 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 BZX84W-B68F part is unused and in its original packaging.
Return procedure for BZX84W-B68F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B68F Tags
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