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Nexperia USA Inc. BZX585-B39,115
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- Part No.:
- BZX585-B39,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B39,115.pdf
- Description:
- DIODE ZENER 39V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,277
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Product details
Overview
BZX585-B39,115 from Nexperia is a ±2 % tolerance Zener diode in SOD523 (SC-79) package, rated for 39 V nominal regulation voltage, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power at 100 µs pulse width. It delivers low differential resistance (80 Ω typ. at IZ = 2 mA) and operates across −65 °C to +150 °C junction temperature for precision voltage reference and overvoltage protection in space-constrained portable electronics.
For engineers reviewing the BZX585-B39,115 datasheet, BZX585-B39,115 pinout, BZX585-B39,115 application, or BZX585-B39,115 equivalent, this device serves as a compact, thermally efficient voltage clamp in battery management, USB interface protection, and low-power sensor supply regulation where tight voltage tolerance and ultra-small footprint are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified nominal Zener voltage of 39 V at IZ = 2 mA, exhibiting a typical differential resistance of 80 Ω and a temperature coefficient of +33.4 mV/K. Its SC-79 package enables surface-mount integration on high-density PCBs while maintaining thermal resistance of 65 K/W from junction to solder point.
The device supports non-repetitive surge handling up to 40 W (100 µs square wave, Tj = 25 °C), with maximum forward voltage of 1.1 V at 100 mA and reverse leakage current ≤ 0.05 µA at 29.4 V. It is designed for stable DC voltage reference and transient clamping without requiring external biasing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal at IZ = 2 mA; defines precise regulation threshold for voltage reference circuits |
| Tolerance | ±2 %; ensures tight output voltage control in precision analog and power monitoring applications |
| 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 Power (PZSM) | 40 W at tp = 100 µs; enables robust transient suppression against ESD or surge events |
| Differential Resistance (rdiff) | 80 Ω typical at IZ = 2 mA; determines regulation stiffness and load-induced voltage drift |
| Junction-to-Solder-Point Thermal Resistance | 65 K/W; allows accurate thermal modeling when mounted on standard PCB copper pads |
| Reverse Leakage Current (IR) | ≤ 0.05 µA at VR = 29.4 V; guarantees minimal quiescent current in standby or low-power modes |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead plastic package: 1.25 mm × 0.85 mm body, 0.65 mm height, cathode marked by bar on top surface; optimized for automated placement and reflow soldering per IPC-7351B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal for correct orientation during assembly |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes reverse-bias path enabling Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-compact SOD523 footprint | Enables placement in <1.1 mm² board area-critical for wearables and miniaturized IoT sensors |
| ±2 % Zener voltage tolerance | Reduces need for post-production trimming in factory calibration of voltage references |
| Low 80 Ω differential resistance | Maintains regulation accuracy under load variations up to ±1 mA without external compensation |
| 40 W non-repetitive surge rating | Withstands IEC 61000-4-2 Level 4 ESD (±15 kV air, ±8 kV contact) without external TVS staging |
| −65 °C to +150 °C operating range | Supports deployment in automotive cabin modules and industrial edge controllers without derating |
Applications
| USB Port Overvoltage Protection | Li-ion Battery Cell Monitor Reference |
|---|---|
|
Use Scenario: Clamps transient voltage spikes on USB VBUS line during hot-plug or ESD events. IC Role / Device Role / Timing Role: Zener clamp placed between VBUS and GND, conducting only above 39 V to shunt excess energy. Use Value: Prevents damage to downstream USB transceivers and PMICs by limiting VBUS to ≤39.8 V (39 V + 2 % tolerance) during surges. |
Use Scenario: Provides stable 39 V reference for ADC input scaling in multi-cell battery pack monitors. IC Role / Device Role / Timing Role: Passive voltage reference connected to high-impedance ADC input; no timing function. Use Value: Enables ±0.8 V absolute accuracy in cell voltage measurement over temperature, supporting SOC estimation within ±1.5 % error. |
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Reset Circuit |
|
Use Scenario: Stabilizes excitation voltage for 4–20 mA loop-powered pressure sensors in factory automation. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant 39 V across sensor bridge, independent of loop current variation. Use Value: Reduces sensor output drift to <0.05 %/°C by eliminating supply-dependent gain errors in analog front-end amplifiers. |
Use Scenario: Generates clean reset threshold for ARM Cortex-M0+ microcontrollers in smart meters. IC Role / Device Role / Timing Role: Zener-based voltage detector feeding comparator input; no built-in timing logic. Use Value: Ensures reliable brown-out detection at 39 V ±0.8 V, preventing firmware corruption during AC mains dips below 90 V RMS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C39,115 | ±5 % tolerance (vs. ±2 %); identical package, power ratings, and Zener voltage nominal value | Acceptable where cost sensitivity outweighs precision requirements, e.g., non-critical power rail clamping | Select for cost-driven consumer electronics where 39 V ±1.95 V regulation suffices |
| MMSZ5267B-7-F | 39 V nominal, ±5 %, SOD-123 package (2.7 mm × 1.4 mm); higher Ptot = 500 mW but larger footprint | Suitable for higher-power dissipation scenarios where board space permits larger package | Choose when thermal margin >300 mW is required and PCB layout accommodates 3× larger area |
Compared with BZX585-C39,115, the BZX585-B39,115 offers tighter regulation for metrology-grade references; versus MMSZ5267B-7-F, it trades thermal headroom for 65 % smaller board area-ideal for ultra-dense portable designs.
Availability
BZX585-B39,115 is available at Aetrix Electronics and suitable for USB interface protection, Li-ion battery monitoring, industrial sensor signal conditioning, and low-power microcontroller reset circuits requiring stable component supply with guaranteed long-term availability.
Supply support for BZX585-B39,115 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, with leadership in advanced packaging and automotive-qualified components.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for space-constrained, low-power voltage regulation and transient suppression in consumer, industrial, and computing applications.
FAQ
What is the maximum continuous reverse current for BZX585-B39,115 at 25 °C ambient?
The device has no specified maximum continuous reverse current; instead, its DC power limit is defined by Ptot = 300 mW. At 39 V Zener voltage, this corresponds to a maximum steady-state Zener current of approximately 7.7 mA (300 mW ÷ 39 V), assuming negligible forward drop and ideal thermal conditions on FR4 PCB.
Can BZX585-B39,115 be used in parallel for higher power handling?
No-Zener diodes exhibit negative temperature coefficients and manufacturing spread, causing current imbalance and thermal runaway when paralleled. For higher power, use a single higher-rated device like BZX84-C39 or discrete MOSFET-based active clamps instead.
Is the SOD523 package compatible with standard reflow profiles?
Yes-the SOD523 outline complies with JEDEC J-STD-020 moisture sensitivity level 1 and supports standard lead-free reflow profiles (peak 260 °C, 60 s max above 217 °C). Figure 12 in the datasheet provides exact solder land dimensions for optimal wetting and void control.
How does the temperature coefficient affect regulation accuracy over −40 °C to +85 °C?
At 39 V nominal, the specified temperature coefficient is +33.4 mV/K. Over a 125 K range, this produces a worst-case drift of ±4.18 V (33.4 mV/K × 125 K), meaning regulation shifts from ~34.8 V to ~43.2 V. System-level compensation or tighter tolerance selection (e.g., ±2 %) mitigates this in precision applications.
BZX585-B39,115 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):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-B39,115 FAQ
1.How can I place an order for BZX585-B39,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B39,115 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-B39,115 reliable?
The price and inventory of BZX585-B39,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B39,115 is usually 5 days.
3.What payment methods are accepted for BZX585-B39,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B39,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B39,115?
BZX585-B39,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B39,115 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-B39,115?
For technical support, including BZX585-B39,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B39,115 requirements.
6.How does Aetrix verify that BZX585-B39,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-B39,115 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-B39,115 meets industry standards.
7.What is the process for return or replacement of BZX585-B39,115?
All BZX585-B39,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B39,115, 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-B39,115 part is unused and in its original packaging.
Return procedure for BZX585-B39,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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