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Nexperia USA Inc. BZX585-B15,135
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- Part No.:
- BZX585-B15,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B15,135.pdf
- Description:
- DIODE ZENER 15V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,211
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Product details
Overview
BZX585-B15,135 from Nexperia is a ±2 % tolerance Zener diode with nominal 15 V regulation voltage, 25 Ω typical differential resistance at 5 mA, and 300 mW total power dissipation in an SOD523 (SC-79) surface-mount package. It provides stable voltage reference and overvoltage protection in space-constrained power rails and signal conditioning circuits.
For engineers reviewing the BZX585-B15,135 datasheet, BZX585-B15,135 pinout, BZX585-B15,135 application, or BZX585-B15,135 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (65 K/W junction-to-solder-point), non-repetitive surge capability (40 W, 100 µs), low capacitance (0.05 pF at 1 MHz), and cathode-anode polarity marking on ultra-small SMD footprint.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 14.25 V to 15.75 V reference across 5 mA test current, with temperature coefficient of +9.2 to +13.0 mV/K. Its low 25 Ω dynamic impedance ensures minimal output voltage variation under load changes.
The device uses silicon planar technology with metallized cathode termination for reliable surge handling. Junction-to-solder-point thermal resistance of 65 K/W enables effective heat transfer to PCB copper, supporting continuous operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.25 V to 15.75 V at IZ = 5 mA - defines regulation band for precision biasing and clamping |
| Differential Resistance (rdiff) | 25 Ω typical at IZ = 5 mA - determines output impedance and load regulation error |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C on FR4 with 35 mm² cathode copper - sets continuous DC power limit |
| Non-repetitive Peak Power (PZSM) | 40 W for 100 µs square wave - supports transient overvoltage suppression without failure |
| Junction-to-Solder-Point Rth | 65 K/W - enables thermal coupling to PCB for sustained power handling in compact layouts |
| Reverse Capacitance (Cd) | 0.05 pF at f = 1 MHz, VR = 0 V - minimizes signal distortion in high-frequency clamp/reference applications |
| Forward Voltage (VF) | 1.1 V at IF = 100 mA - defines conduction loss when used in forward-biased protection paths |
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.
| 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; forms reverse-bias path during Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation than ±5 % variants, reducing need for post-regulation trimming in precision references |
| Ultra-small SOD523 footprint | 0.85 mm × 1.25 mm area saves board space in wearables, IoT sensors, and dense power modules |
| 40 W non-repetitive surge rating | Withstands ESD and lightning-induced transients without degradation when properly decoupled |
| 65 K/W junction-to-solder-point Rth | Allows >200 mA average current capability with adequate PCB copper, exceeding standard SOD-323 limits |
| 0.05 pF junction capacitance | Maintains signal integrity in RF detector biasing and high-speed logic clamp applications |
Applications
| Power Supply Rail Clamping | Reference Voltage Generation |
|---|---|
Use Scenario: Protecting 15 V analog front-end inputs from supply overvoltage events. IC Role / Device Role / Timing Role: Zener clamps excess voltage to 15.75 V maximum, diverting surge current to ground. Use Value: Prevents damage to downstream op-amps and ADCs while maintaining <100 ns response due to low capacitance. |
Use Scenario: Providing stable bias for current-sense amplifier feedback networks. IC Role / Device Role / Timing Role: Delivers 15 V reference with ±2 % initial accuracy and <15 mV/K tempco drift. Use Value: Enables <0.5 % total measurement error over −40 °C to +85 °C ambient range. |
| ESD Protection for Low-Voltage I/O | Signal-Level Voltage Limiting |
Use Scenario: Safeguarding 3.3 V MCU GPIO pins against contact discharge per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: Acts as bidirectional clamp with forward conduction at 1.1 V and reverse breakdown at 15 V. Use Value: Absorbs 40 W peak pulse energy without parametric shift, verified per AEC-Q200 stress profiles. |
Use Scenario: Constraining audio line driver output swing to prevent amplifier saturation. IC Role / Device Role / Timing Role: Limits positive excursions to 15.75 V while presenting <0.05 pF loading to AC signal path. Use Value: Eliminates harmonic distortion above 10 MHz without affecting small-signal bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C15 | ±5 % tolerance (14.25–15.75 V same range, but wider distribution) | Acceptable where cost sensitivity outweighs tight regulation needs | Select for cost-driven consumer electronics with relaxed voltage stability requirements |
| MMSZ5245B-7-F | Same 15 V nominal, ±5 %, but SOD-123 package (larger, 2.7 × 1.6 mm) | Higher Ptot (500 mW) but 3× larger footprint and 150 K/W Rth(j-a) | Choose only when higher continuous power is required and board space permits |
Compared with BZX585-C15, the BZX585-B15,135 offers tighter voltage control critical for precision analog stages; versus MMSZ5245B-7-F, it delivers superior thermal performance and space efficiency despite identical nominal voltage, making it optimal for miniaturized industrial sensor nodes.
Availability
BZX585-B15,135 is available at Aetrix Electronics and suitable for power supply clamping, reference voltage generation, ESD protection, and signal-level limiting requiring stable component supply and traceable sourcing.
Supply support for BZX585-B15,135 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 belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, thermally efficient voltage regulation and transient suppression in space-constrained SMT designs.
FAQ
What is the maximum continuous reverse current for BZX585-B15,135 at 25 °C ambient?
The absolute maximum forward current is 200 mA, but for Zener operation, the recommended continuous reverse current is limited by power dissipation: at 25 °C ambient on FR4 with 35 mm² cathode copper, IZ ≤ 20 mA ensures Ptot ≤ 300 mW. Derating is required above 25 °C per the 350 K/W junction-to-ambient thermal resistance.
How does the cathode marking appear on the SOD523 package?
A single laser-marked bar is located on the top surface adjacent to pin 1 (cathode), aligned parallel to the long edge of the 1.25 mm × 0.85 mm body. This matches the graphic symbol in Figure 11 of the datasheet and distinguishes polarity during automated optical inspection and placement.
Can BZX585-B15,135 be used in place of a 1N4744A in a 15 V regulator?
No - the 1N4744A uses DO-41 through-hole packaging (2.5 W Ptot, 16.7 V nominal), while BZX585-B15,135 is SMD-only (300 mW, 15 V nominal, ±2 %). Direct substitution requires PCB redesign, thermal analysis for derated power, and verification of surge immunity compatibility due to differing PZSM test conditions.
What is the typical temperature coefficient behavior at 15 V regulation?
At 15 V nominal, the BZX585-B15 exhibits a positive temperature coefficient of +9.2 to +13.0 mV/K over 25–150 °C junction range. This means output voltage increases ~12 mV per °C rise, requiring compensation in high-stability references - unlike lower-voltage Zeners (<5 V) which show negative coefficients.
BZX585-B15,135 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):
- 15 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 10.5 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-B15,135 FAQ
1.How can I place an order for BZX585-B15,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B15,135 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-B15,135 reliable?
The price and inventory of BZX585-B15,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B15,135 is usually 5 days.
3.What payment methods are accepted for BZX585-B15,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B15,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B15,135?
BZX585-B15,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B15,135 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-B15,135?
For technical support, including BZX585-B15,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B15,135 requirements.
6.How does Aetrix verify that BZX585-B15,135 is sourced from the original manufacturer or authorized distributors?
All BZX585-B15,135 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-B15,135 meets industry standards.
7.What is the process for return or replacement of BZX585-B15,135?
All BZX585-B15,135 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B15,135, 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-B15,135 part is unused and in its original packaging.
Return procedure for BZX585-B15,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585-B15,135 Tags
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MM5Z5V1ST1G
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