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Nexperia USA Inc. BZX585-B47,115
- Part No.:
- BZX585-B47,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B47,115.pdf
- Description:
- DIODE ZENER 47V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:567
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Product details
Overview
BZX585-B47,115 from Nexperia is a 47 V ±2 % tolerance Zener diode in SOD523 (SC-79) package, designed for precision voltage regulation and reference functions in space-constrained PCBs. It delivers 300 mW total power dissipation, 40 W non-repetitive peak reverse power handling (tp = 100 µs), and exhibits 85 Ω typical differential resistance at IZ = 2 mA with a temperature coefficient of +42.0 mV/K.
For engineers reviewing the BZX585-B47,115 datasheet, BZX585-B47,115 pinout, BZX585-B47,115 application, or BZX585-B47,115 equivalent, this device serves as a stable, low-capacitance (0.05 pF at 1 MHz, VR = 0 V) voltage reference in low-power analog sensing, overvoltage clamping, and biasing circuits where thermal resistance to solder point is critical (Rth(j–sp) = 65 K/W).
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal working voltage of 47 V, specified at IZ = 2 mA under Tj = 25 °C conditions. Its ±2 % tolerance and low 85 Ω differential resistance ensure tight regulation stability across load and temperature variations.
The device uses silicon planar technology in an ultra-small SOD523 package with cathode-marked lead configuration. Thermal performance is defined by Rth(j–a) = 350 K/W (FR4, 35 mm² Cu) and Rth(j–sp) = 65 K/W, enabling reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 46.1 V to 47.9 V at IZ = 2 mA - defines precise clamping threshold for protection or reference |
| Tolerance | ±2 % - enables tighter system-level voltage margin control vs. ±5 % variants |
| Differential Resistance (rdiff) | 85 Ω typ. at IZ = 2 mA - determines output impedance and regulation sensitivity to current changes |
| Temperature Coefficient (SZ) | +42.0 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 with 35 mm² Cu - sets continuous DC power limit under standard board layout |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 µs square wave - supports transient surge suppression without failure |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 32.9 V - ensures minimal leakage below breakdown, critical for low-power standby circuits |
| Diode Capacitance (Cd) | 0.05 pF at f = 1 MHz, VR = 0 V - enables high-frequency noise filtering and fast transient response |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead surface-mount plastic package: 1.25 mm × 0.85 mm footprint, 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; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased during Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-compact SMD package | SOD523 footprint (1.25 × 0.85 mm) enables high-density routing in wearables and IoT sensors |
| Low differential resistance | 85 Ω typ. at 2 mA ensures <100 mV output shift over ±1 mA load variation |
| Controlled temperature coefficient | +42.0 mV/K allows predictable drift compensation in temperature-stable references |
| Low leakage current | ≤0.05 µA at 32.9 V minimizes quiescent power loss in battery-powered systems |
| High surge robustness | 40 W non-repetitive peak power rating protects against ESD and line transients |
Applications
| Power Supply Rail Clamping | Low-Power Sensor Biasing |
|---|---|
|
Use Scenario: Protecting 3.3 V or 5 V microcontroller I/O pins from accidental overvoltage events in industrial fieldbus interfaces. IC Role / Device Role / Timing Role: Zener acts as shunt clamp, conducting excess current above 47 V to ground before downstream IC damage occurs. Use Value: 40 W surge rating absorbs 100 µs transients without degradation; 0.05 pF capacitance avoids signal integrity distortion on high-speed lines. |
Use Scenario: Providing stable 47 V reference for photodiode transimpedance amplifier gain calibration in portable gas analyzers. IC Role / Device Role / Timing Role: Functions as precision voltage reference source with ±2 % initial accuracy and low tempco for analog front-end trimming. Use Value: 85 Ω rdiff ensures <0.1 % gain error contribution; 300 mW Ptot supports continuous operation in sealed enclosures. |
| DC-DC Converter Feedback | LED String Voltage Reference |
|
Use Scenario: Setting output voltage in isolated flyback converters using optocoupler feedback with secondary-side regulation. IC Role / Device Role / Timing Role: Zener establishes accurate 47 V threshold that triggers TL431 or optocoupler LED drive when output exceeds setpoint. Use Value: Tight ±2 % tolerance reduces output voltage variance across production units; low 0.05 µA IR prevents loading of high-impedance feedback dividers. |
Use Scenario: Establishing constant-current bias for UV-C LED strings requiring 45–49 V forward drop in sterilization modules. IC Role / Device Role / Timing Role: Provides stable voltage reference to current-sense amplifier, enabling precise LED current regulation independent of input ripple. Use Value: +42.0 mV/K tempco matches LED Vf drift trend, minimizing thermal current drift; SOD523 size fits tight LED driver PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C47,115 | ±5 % tolerance (44.65–49.35 V), higher max rdiff (375 Ω), same package and PZSM | Acceptable where system-level voltage margin > ±5 %; less suitable for precision references | Select for cost-sensitive designs where tighter regulation is not required |
| MMSZ47ET1G | 47 V ±5 %, SOD-123 package (2.7 × 1.6 mm), 500 mW Ptot, 100 Ω rdiff | Larger footprint but higher continuous power; better thermal derating on standard FR4 | Choose when board layout allows larger package and higher steady-state power is needed |
Compared with BZX585-C47,115, the BZX585-B47,115 offers tighter voltage control essential for reference accuracy; versus MMSZ47ET1G, it trades 200 mW Ptot for 40 % smaller area and lower parasitic capacitance-critical in high-frequency or space-limited designs.
Availability
BZX585-B47,115 is available at Aetrix Electronics and suitable for power supply clamping, sensor biasing, DC-DC feedback, and LED reference applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for BZX585-B47,115 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 leading semiconductor manufacturer specializing in high-volume, high-reliability discrete and logic devices, headquartered in Nijmegen, Netherlands, with global manufacturing and distribution infrastructure.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, thermally efficient voltage regulation in consumer, industrial, and communications equipment where SOD523 packaging and tight tolerances are prioritized.
FAQ
What is the maximum continuous reverse current this Zener can handle?
The BZX585-B47,115 has a maximum forward current (IF) rating of 200 mA, but its continuous reverse (Zener) current is limited by thermal dissipation. At 25 °C ambient on FR4 with 35 mm² copper, it supports ≤6.4 mA continuous Zener current to stay within 300 mW Ptot-calculated as 47 V × 6.4 mA ≈ 300 mW. Derating is required above 25 °C.
How does the +42.0 mV/K temperature coefficient affect circuit design?
The positive +42.0 mV/K coefficient means VZ increases ~42 mV per °C rise in junction temperature. In precision references, this must be compensated via resistor networks or matched components; in clamping applications, it provides predictable overvoltage headroom expansion at elevated temperatures-enhancing safety margin in hot environments.
Can this diode be used in AC signal clipping applications?
Yes-the BZX585-B47,115 supports bidirectional clipping when paired with a series diode or used back-to-back, leveraging its symmetric forward voltage (~1.1 V at 100 mA) and sharp 47 V reverse breakdown. However, its 0.05 pF capacitance and low 200 mA IF rating restrict use to low-current, high-frequency signals (<10 MHz) where minimal loading is critical.
Is the SOD523 package compatible with standard reflow profiles?
Yes-the SOD523 package is qualified for lead-free reflow per J-STD-020. Recommended profile includes peak temperature ≤260 °C, time above liquidus 60–150 s, and ramp rates ≤3 °C/s. Figure 12 in the datasheet specifies exact solder land dimensions (1.4 × 0.5 mm pads, 0.4 mm gap) to ensure reliable joint formation and avoid tombstoning.
BZX585-B47,115 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):
- 47 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.9 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-B47,115 FAQ
1.How can I place an order for BZX585-B47,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B47,115 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-B47,115 reliable?
The price and inventory of BZX585-B47,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B47,115 is usually 5 days.
3.What payment methods are accepted for BZX585-B47,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B47,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B47,115?
BZX585-B47,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B47,115 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-B47,115?
For technical support, including BZX585-B47,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B47,115 requirements.
6.How does Aetrix verify that BZX585-B47,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-B47,115 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-B47,115 meets industry standards.
7.What is the process for return or replacement of BZX585-B47,115?
All BZX585-B47,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B47,115, 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-B47,115 part is unused and in its original packaging.
Return procedure for BZX585-B47,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585-B47,115 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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