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Nexperia USA Inc. BZX585-B56,115
- Part No.:
- BZX585-B56,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B56,115.pdf
- Description:
- DIODE ZENER 56V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:2,063
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Product details
Overview
BZX585-B56,115 from Nexperia is a 56 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 in space-constrained low-power circuits such as sensor biasing and reference stabilization.
For engineers reviewing the BZX585-B56,115 datasheet, BZX585-B56,115 pinout, BZX585-B56,115 application, or BZX585-B56,115 equivalent, this page delivers verified Zener voltage, differential resistance, thermal resistance, surge capability, and cathode/anode terminal mapping - 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 56 V at IZ = 2 mA, exhibiting a typical differential resistance of 100 Ω and a positive temperature coefficient of +57 mV/K at that current. Its low 350 K/W junction-to-ambient thermal resistance enables stable regulation under pulsed load conditions when mounted on FR4 PCB with 35 mm² copper area at the cathode tab.
The device supports non-repetitive surge handling up to 40 W for 100 µs square-wave pulses at Tj = 25 °C, with a maximum non-repetitive peak reverse current of 0.3 A under those conditions. Reverse leakage remains below 0.05 µA at VR = 44.8 V (80 % of VZ), ensuring minimal quiescent current draw in standby mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V nominal at IZ = 2 mA; ±2 % tolerance ensures tight regulation in feedback references. |
| Differential Resistance (rdiff) | 100 Ω typical at IZ = 2 mA; low impedance maintains stable output under varying load currents. |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C on FR4 with 35 mm² Cu; defines continuous DC regulation capability. |
| Non-repetitive Peak Power (PZSM) | 40 W for 100 µs pulse; enables transient overvoltage clamping without device failure. |
| Junction-to-Ambient Rth | 350 K/W in free air; high thermal resistance necessitates careful PCB copper layout for sustained operation. |
| Reverse Leakage (IR) | < 0.05 µA at VR = 44.8 V; negligible standby current preserves battery life in portable systems. |
| Package | SOD523 (SC-79); 1.25 mm × 0.85 mm footprint ideal for ultra-dense consumer and IoT PCB layouts. |
Pinout & Package
SOD523 (SC-79) plastic surface-mounted package with 2 leads; cathode identified by marking bar on top surface; body dimensions: 1.25 mm (L) × 0.85 mm (W) × 0.65 mm (H); lead pitch: 0.65 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal; carries reverse breakdown current. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-biased path during Zener conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SMD package | SOD523 footprint (1.25 × 0.85 mm) reduces board area by >50 % vs. SOD323 in compact wearables and hearing aids. |
| Tight voltage tolerance | ±2 % VZ tolerance enables use in precision 56 V reference chains without post-calibration trimming. |
| Low differential resistance | 100 Ω rdiff minimizes output voltage shift across 1–5 mA load variations in analog front-end biasing. |
| Controlled thermal resistance | Rth(j-sp) = 65 K/W to solder point allows predictable junction temperature rise during short surges. |
| High surge robustness | 40 W non-repetitive peak power rating supports ESD protection integration in USB-C and sensor interface lines. |
Applications
| Power Supply Reference | Sensor Biasing |
|---|---|
Use Scenario: Providing stable 56 V reference for high-voltage op-amp feedback networks in industrial signal conditioners. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference, maintaining fixed potential across resistor divider network. Use Value: ±2 % VZ tolerance and 100 Ω rdiff ensure reference drift < 0.5 % over 1–3 mA load range. |
Use Scenario: Biasing avalanche photodiodes requiring precise 56 V reverse bias in optical smoke detectors. IC Role / Device Role / Timing Role: Functions as low-noise, low-leakage voltage clamp to set PD operating point. Use Value: < 0.05 µA IR at 44.8 V prevents dark current interference and extends battery runtime. |
| Overvoltage Clamping | Microcontroller Reset Circuit |
Use Scenario: Protecting 50 V-rated ADC inputs from transient spikes in automotive body control modules. IC Role / Device Role / Timing Role: Shunt clamping device diverting surge energy during load dump events. Use Value: 40 W PZSM rating handles 100 µs transients without degradation, validated per IEC 61000-4-5. |
Use Scenario: Generating clean 56 V reset threshold for high-voltage microcontrollers in smart meter power supplies. IC Role / Device Role / Timing Role: Zener-based voltage monitor triggering POR circuitry when input exceeds 56 V. Use Value: Sharp knee at 56 V with 100 Ω rdiff ensures <100 mV hysteresis and reliable reset assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C56,115 | Same 56 V nominal voltage but ±5 % tolerance; higher max rdiff (120 Ω); identical package and surge rating. | Acceptable where cost sensitivity outweighs precision; less suitable for closed-loop references. | Select when budget constraints dominate and 5 % VZ variation is acceptable in system margin analysis. |
| MMSZ5256B-7-F | 56 V ±5 %; SOD-123 package (larger: 2.7 × 1.4 mm); 500 mW Ptot; rdiff = 110 Ω; no specified PZSM. | Better thermal performance (200 K/W Rth(j-a)) but incompatible with ultra-dense layouts. | Choose when higher continuous power or legacy footprint compatibility is required over size reduction. |
Compared with BZX585-C56,115, the BZX585-B56,115 offers tighter regulation for precision references; versus MMSZ5256B-7-F, it sacrifices thermal headroom and surge documentation for 55 % smaller board area - critical in miniaturized medical sensors.
Availability
BZX585-B56,115 is available at Aetrix Electronics and suitable for sensor biasing, power supply referencing, overvoltage clamping, and microcontroller reset circuits requiring stable component supply and guaranteed traceability.
Supply support for BZX585-B56,115 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, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.
The BZX585 series targets space-constrained, low-power voltage regulation applications - designed specifically for ultra-miniature SMD deployment in wearables, IoT endpoints, and portable instrumentation where SC-79 footprint and ±2 % tolerance deliver measurable system-level miniaturization and accuracy benefits.
FAQ
What is the maximum continuous reverse current for BZX585-B56,115 at 25 °C ambient?
The maximum continuous reverse current is derived from its 300 mW total power dissipation and 56 V Zener voltage: IZ(max) = 300 mW / 56 V ≈ 5.36 mA. This assumes no additional thermal derating and full copper pad cooling per datasheet condition (35 mm² Cu at cathode).
Does BZX585-B56,115 support reflow soldering, and what profile is recommended?
Yes, it is qualified for lead-free reflow per JEDEC J-STD-020. The recommended peak temperature is 260 °C for ≤ 30 seconds, with ramp-up rate ≤ 3 °C/s and ramp-down rate ≤ 6 °C/s. Figure 12 in the datasheet provides the exact SOD523 solder land pattern (1.4 mm × 0.5 mm pads, 0.4 mm gap).
How does the temperature coefficient affect regulation accuracy over –40 °C to +125 °C?
At IZ = 2 mA, the temperature coefficient is +57 mV/K. Over a 165 K range, this yields ~9.4 V drift - but actual variation is nonlinear and mitigated by operating at higher IZ. Datasheet Fig. 7 shows SZ drops to +30 mV/K above 5 mA, reducing drift significantly in active regulation.
Can BZX585-B56,115 replace older BZX79 or BZX85 series Zeners in existing designs?
No direct drop-in replacement: BZX585-B56,115 uses SOD523 (0.85 mm width), while BZX79/BZX85 are through-hole DO-35 or axial packages. Electrical equivalence requires verifying rdiff, PZSM, and thermal layout - the SOD523's higher Rth(j-a) (350 K/W vs. ~200 K/W for DO-35) demands revised copper area to avoid thermal runaway.
BZX585-B56,115 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):
- 56 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 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-B56,115 FAQ
1.How can I place an order for BZX585-B56,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B56,115 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-B56,115 reliable?
The price and inventory of BZX585-B56,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B56,115 is usually 5 days.
3.What payment methods are accepted for BZX585-B56,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B56,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B56,115?
BZX585-B56,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B56,115 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-B56,115?
For technical support, including BZX585-B56,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B56,115 requirements.
6.How does Aetrix verify that BZX585-B56,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-B56,115 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-B56,115 meets industry standards.
7.What is the process for return or replacement of BZX585-B56,115?
All BZX585-B56,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B56,115, 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-B56,115 part is unused and in its original packaging.
Return procedure for BZX585-B56,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585-B56,115 Tags
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