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Nexperia USA Inc. BZX585-B68,115
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- Part No.:
- BZX585-B68,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B68,115.pdf
- Description:
- DIODE ZENER 68V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,833
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Product details
Overview
BZX585-B68,115 from Nexperia is a 68 V ±2 % tolerance Zener diode in SOD523 (SC-79) package, rated for 300 mW total power dissipation and 40 W non-repetitive peak reverse power, used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the BZX585-B68,115 datasheet, BZX585-B68,115 pinout, BZX585-B68,115 application, or BZX585-B68,115 equivalent, this page delivers verified Zener voltage, differential resistance, thermal resistance, cathode/anode terminal mapping, and real-world regulation use cases - all confirmed from Nexperia's official Rev. 8 product data sheet dated 6 August 2026.
Technical Context
This Zener diode operates in reverse breakdown with a nominal Zener voltage of 68 V at IZ = 2 mA, exhibiting a typical differential resistance of 150 Ω and a temperature coefficient of +71.7 mV/K - indicating positive thermal drift optimized for stable reference performance above 6 V. Its SC-79 package enables high-density PCB layouts while maintaining thermal resistance from junction to solder point at 65 K/W.
Designed for low-current regulation (max IF = 200 mA, max IZSM = 0.25 A), it supports transient suppression via 100 µs square-wave surge capability and complies with IEC 60134 absolute maximum ratings, including Tj up to 150 °C and storage temperature range −65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 66.64 V to 69.36 V at IZ = 2 mA - defines precise clamping threshold for 68 V nominal rail regulation |
| Differential Resistance (rdiff) | 150 Ω typical at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient (SZ) | +71.7 mV/K at IZ = 2 mA - quantifies voltage drift per degree Celsius rise in junction temperature |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C on FR4 PCB with 35 mm² copper - sets continuous DC power handling limit |
| Non-repetitive Peak Reverse Power (PZSM) | 40 W for tp = 100 µs square wave - enables short-duration surge clamping without failure |
| Junction-to-Solder-Point Thermal Resistance (Rth(j-sp)) | 65 K/W - governs thermal path efficiency from die to PCB copper, critical for reliability under pulsed loads |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 52.5 V - ensures minimal leakage below breakdown, preserving low-power standby integrity |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead surface-mount plastic package: 1.25 mm × 0.85 mm body, 0.65 mm height, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to ground or lower-potential reference; completes reverse-bias current path |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD523 packaging | Enables <1.3 mm² board area usage - ideal for space-constrained wearables and IoT sensor nodes |
| ±2 % Zener voltage tolerance (B-series) | Reduces need for post-production trimming in precision reference circuits requiring tight initial accuracy |
| 40 W non-repetitive peak power rating | Supports ESD and lightning-induced transient suppression without derating in 100 µs pulse applications |
| 65 K/W junction-to-solder-point thermal resistance | Allows direct thermal coupling to PCB copper pour, improving long-term stability in thermally cycled environments |
| 0.05 µA max reverse leakage at 52.5 V | Minimizes quiescent current draw in battery-powered systems operating near Zener knee voltage |
Applications
| Power Supply Rail Clamp | ADC Reference Stabilizer |
|---|---|
|
Use Scenario: Clamping 68 V intermediate DC bus in industrial PLC I/O modules against load dump transients. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and overvoltage protector in parallel with bulk capacitor. Use Value: Limits voltage excursions to ≤69.36 V during 100 µs surges, preventing damage to downstream 75 V-rated MOSFET drivers and op-amps. |
Use Scenario: Providing stable 68 V reference for 16-bit SAR ADC biasing in high-voltage sensor signal conditioning. IC Role / Device Role / Timing Role: Precision Zener reference source feeding resistive divider network to generate scaled reference voltage. Use Value: Delivers ±2 % initial accuracy and +71.7 mV/K tempco - enabling calibration compensation for full-scale error <0.1 % over 0–70 °C ambient. |
| Low-Power Sensor Bias | EEPROM Write Protection |
|
Use Scenario: Biasing photodiode amplifier stages in optical smoke detectors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-leakage Zener establishing fixed reverse bias across photodiode junction. Use Value: Maintains <0.05 µA leakage at 52.5 V, extending 10-year battery life while ensuring consistent responsivity across temperature. |
Use Scenario: Enabling write-protection circuitry in automotive-grade EEPROMs that require ≥66.64 V to unlock programming mode. IC Role / Device Role / Timing Role: Voltage detection element triggering enable logic only when system voltage exceeds Zener threshold. Use Value: Guarantees activation window between 66.64 V and 69.36 V - rejecting noise while ensuring reliable unlock during valid high-voltage programming pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C68,115 | ±5 % tolerance (vs. ±2 %), identical 68 V nominal, same SOD523 package and PZSM/Ptot ratings | Acceptable where cost-sensitive designs tolerate wider voltage spread; less suitable for precision references | Select for cost-driven consumer electronics where 68 V ±3.4 V (±5 %) meets functional margin requirements |
| MMSZ5263B-7-F | 68 V ±5 %, SOD-123 package (2.7 × 1.4 mm), higher Ptot = 500 mW, Rth(j-a) = 300 K/W (vs. 350 K/W) | Better thermal performance in free-air, but 2.3× larger footprint limits ultra-compact layouts | Choose when board space permits and higher continuous power handling is needed, e.g., in 12 V auxiliary supplies with 68 V clamp |
Compared with BZX585-C68,115, the BZX585-B68,115 offers tighter voltage control essential for calibration-critical references; versus MMSZ5263B-7-F, it trades thermal margin and power for 55 % smaller PCB area - making it optimal for miniaturized, battery-operated systems demanding ±2 % accuracy.
Availability
BZX585-B68,115 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical monitors, and telecom line-card power supervision requiring stable component supply and guaranteed traceability.
Supply support for BZX585-B68,115 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 discrete and logic devices, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for compact, low-power voltage regulation and transient protection in space-constrained consumer, industrial, and computing applications.
FAQ
What is the maximum continuous forward current for BZX585-B68,115?
The absolute maximum forward current is 200 mA, per IEC 60134 limiting values. However, forward conduction is not its intended operating mode; sustained forward bias risks thermal runaway due to low differential resistance in forward direction and must be avoided in regulation applications.
How does the 65 K/W junction-to-solder-point thermal resistance impact PCB layout?
This value requires direct thermal connection of the cathode pad to ≥35 mm² of 1 oz copper on the PCB. Layouts must avoid thermal isolation - such as narrow traces or cutouts - under the cathode tab, otherwise junction temperature will exceed 150 °C even at 300 mW, accelerating parametric drift and failure.
Can BZX585-B68,115 replace BZX585-B62,115 in an existing design?
Yes, with verification of system-level voltage margin: BZX585-B62,115 has VZ = 60.76–63.24 V, while BZX585-B68,115 is 66.64–69.36 V. The 6 V higher clamping level may affect overvoltage trip points and must be validated against downstream component ratings and functional safety thresholds.
Is the 40 W non-repetitive peak power rating applicable to repetitive pulses?
No - the 40 W rating applies exclusively to single, isolated 100 µs square-wave pulses at Tj = 25 °C prior to surge. Repetitive pulses require derating based on duty cycle and thermal time constants; for >1 Hz repetition, average power must stay ≤300 mW to prevent cumulative junction heating beyond 150 °C.
BZX585-B68,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 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-523
BZX585-B68,115 FAQ
1.How can I place an order for BZX585-B68,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B68,115 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 BZX585-B68,115 reliable?
The price and inventory of BZX585-B68,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B68,115 is usually 5 days.
3.What payment methods are accepted for BZX585-B68,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B68,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B68,115?
BZX585-B68,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B68,115 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 BZX585-B68,115?
For technical support, including BZX585-B68,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B68,115 requirements.
6.How does Aetrix verify that BZX585-B68,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-B68,115 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 BZX585-B68,115 meets industry standards.
7.What is the process for return or replacement of BZX585-B68,115?
All BZX585-B68,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B68,115, 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 BZX585-B68,115 part is unused and in its original packaging.
Return procedure for BZX585-B68,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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