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Nexperia USA Inc. BZX585-B30,115
- Part No.:
- BZX585-B30,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B30,115.pdf
- Description:
- DIODE ZENER 30V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:11,700
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Product details
Overview
BZX585-B30,115 from Nexperia is a ±2 % tolerance Zener diode in SOD523 (SC-79) package, rated for 30 V nominal Zener voltage, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power. It delivers low differential resistance (70 Ω at IZ = 2 mA) and operates across −65 °C to +150 °C junction temperature, serving as a precision voltage reference in compact power management circuits.
For engineers reviewing the BZX585-B30,115 datasheet, BZX585-B30,115 pinout, BZX585-B30,115 application, or BZX585-B30,115 equivalent, this device supports stable low-current regulation in space-constrained consumer, industrial, and IoT endpoint designs where tight voltage tolerance and thermal robustness are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified nominal Zener voltage of 30 V at IZ = 2 mA, exhibiting a temperature coefficient of +24.4 mV/K and reverse current ≤0.05 µA at VR = 22.5 V. Its low 70 Ω differential resistance ensures minimal voltage variation under load changes.
The device uses an ultra-small SOD523 surface-mount package with cathode-marked lead configuration, optimized for high-density PCB layouts. Thermal resistance from junction to solder point is 65 K/W, enabling reliable operation up to 150 °C junction temperature when mounted on FR4 with 35 mm² copper area at the cathode tab.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V nominal at IZ = 2 mA; ±2 % tolerance ensures precise clamping in feedback loops. |
| Total Power Dissipation | 300 mW at Tamb = 25 °C; defines maximum continuous DC power handling on standard FR4 PCB. |
| Non-repetitive Peak Reverse Power | 40 W for tp = 100 µs square wave; enables transient overvoltage suppression without failure. |
| Differential Resistance | 70 Ω typical at IZ = 2 mA; determines output impedance and regulation sensitivity to current shifts. |
| Reverse Current (IR) | ≤0.05 µA at VR = 22.5 V; guarantees minimal leakage in high-impedance bias networks. |
| Temperature Coefficient | +24.4 mV/K at IZ = 2 mA; quantifies voltage drift per degree Celsius rise in junction temperature. |
| Junction-to-Solder-Point Thermal Resistance | 65 K/W; establishes thermal path efficiency for heat transfer from die to PCB copper. |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead surface-mount plastic package with 2 terminals; cathode identified by marking bar on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; accepts reverse-bias voltage and conducts Zener current during regulation. |
| 2 | Anode (A) | Connected to circuit ground or lower-potential reference; completes reverse-bias path for breakdown operation. |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables accurate voltage setting in feedback networks without post-production trimming. |
| Ultra-small SOD523 footprint | Reduces PCB area by >50 % vs. SOD323; supports miniaturized wearables and sensor nodes. |
| Low differential resistance (70 Ω) | Minimizes output voltage deviation under ±1 mA load current change in reference circuits. |
| High surge capability (40 W, 100 µs) | Withstands ESD and line transients without degradation in power supply protection paths. |
| −65 °C to +150 °C operating range | Supports deployment in automotive under-hood modules and industrial motor control enclosures. |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp for MCU I/O |
|---|---|
|
Use Scenario: Stabilizing output voltage in isolated flyback or buck converter feedback loop using optocoupler-coupled TL431 alternative. IC Role / Device Role / Timing Role: Zener diode provides fixed 30 V reference to error amplifier input, defining regulated output setpoint. Use Value: ±2 % tolerance ensures <±0.6 V output accuracy; low rdiff maintains regulation stability across load steps. |
Use Scenario: Protecting 3.3 V or 5 V microcontroller GPIO pins from accidental 24 V field wiring faults. IC Role / Device Role / Timing Role: Acts as shunt clamp, conducting excess current when reverse voltage exceeds 30 V threshold. Use Value: 40 W surge rating absorbs 100 µs transients without failure; 0.05 µA leakage avoids signal integrity issues. |
| Portable Battery Voltage Monitor | Industrial Sensor Signal Conditioning |
|
Use Scenario: Scaling lithium-ion battery pack voltage (e.g., 0–42 V) into ADC input range of low-power PMIC. IC Role / Device Role / Timing Role: Forms precision voltage divider leg with high-value resistor to attenuate and reference battery voltage. Use Value: Tight 30 V tolerance enables accurate full-scale calibration; 150 °C max Tj supports operation near battery cells. |
Use Scenario: Providing stable bias voltage for analog front-end op-amps in 4–20 mA transmitter modules. IC Role / Device Role / Timing Role: Supplies clean, low-noise 30 V rail for op-amp VCC, rejecting ripple from unregulated 36 V loop supply. Use Value: 70 Ω rdiff limits noise coupling; 300 mW Ptot accommodates worst-case quiescent current in harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C30,115 | ±5 % tolerance (vs. ±2 %); identical package, power ratings, and Zener voltage nominal. | Acceptable where cost sensitivity outweighs precision requirement; higher IR (0.05 µA vs. 0.05 µA same) and rdiff (80 Ω vs. 70 Ω). | Select for non-critical biasing where 30 V ±1.5 V suffices and BOM cost reduction is prioritized. |
| MMSZ5257ET1G | SOD-123 package (larger); ±5 % tolerance; 500 mW Ptot; 30 V nominal; rdiff = 40 Ω at IZ = 20 mA. | Higher power handling but larger footprint; better regulation at higher currents, unsuitable for ultra-dense layouts. | Choose when board space permits and higher continuous current (>2 mA) regulation stability is needed. |
Compared with BZX585-C30,115, the BZX585-B30,115 offers tighter voltage control critical for precision references; versus MMSZ5257ET1G, it trades power margin and lower rdiff for 40 % smaller PCB area and superior thermal performance in confined spaces.
Availability
BZX585-B30,115 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and automotive body-control units requiring stable component supply with guaranteed long-term manufacturability.
Supply support for BZX585-B30,115 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 essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, thermally efficient voltage regulation and transient protection in space- and power-constrained applications.
FAQ
What is the maximum continuous reverse current the BZX585-B30,115 can sustain?
The device has no specified maximum continuous reverse current; its safe operating limit is defined by total power dissipation (300 mW at 25 °C ambient). At 30 V Zener voltage, this corresponds to ~10 mA average reverse current on FR4 PCB with 35 mm² copper at cathode. Derating applies above 25 °C per Rth(j-a) = 350 K/W.
Can BZX585-B30,115 be used in place of a 3.3 V Zener diode?
No - BZX585-B30,115 is a 30 V Zener diode, not 3.3 V. Substituting it for a 3.3 V part would result in catastrophic overvoltage at the regulated node. For 3.3 V regulation, use BZX585-B3V3,115 (3.3 V, ±2 %) or BZX585-C3V3,115 (3.3 V, ±5 %), both in identical SOD523 packaging.
How does the cathode marking appear on the BZX585-B30,115 package?
The cathode is marked by a visible bar on the top surface of the SOD523 package, aligned with Pin 1. Per datasheet Figure 11, this bar is located adjacent to the shorter end of the rectangular body and corresponds to the terminal labeled "K" in the pinning diagram. Visual inspection confirms polarity before placement.
Is BZX585-B30,115 suitable for automotive applications?
No - this part is not automotive-qualified. Nexperia explicitly states in Section 14 that non-automotive qualified products like BZX585-B30,115 are neither tested nor warranted for automotive use. For AEC-Q200 compliance, select Nexperia's automotive-grade Zener series (e.g., BZX84-Axxx variants) with documented qualification reports.
BZX585-B30,115 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):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 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-B30,115 FAQ
1.How can I place an order for BZX585-B30,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B30,115 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-B30,115 reliable?
The price and inventory of BZX585-B30,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B30,115 is usually 5 days.
3.What payment methods are accepted for BZX585-B30,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B30,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B30,115?
BZX585-B30,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B30,115 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-B30,115?
For technical support, including BZX585-B30,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B30,115 requirements.
6.How does Aetrix verify that BZX585-B30,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-B30,115 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-B30,115 meets industry standards.
7.What is the process for return or replacement of BZX585-B30,115?
All BZX585-B30,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B30,115, 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-B30,115 part is unused and in its original packaging.
Return procedure for BZX585-B30,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585-B30,115 Tags
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MM5Z5V1ST1G
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