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Nexperia USA Inc. BZX585-B3V9,135
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- Part No.:
- BZX585-B3V9,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B3V9,135.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:8,540
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Product details
Overview
BZX585-B3V9,135 from Nexperia is a ±2 % tolerance Zener diode in SOD523 (SC-79) package, rated for 3.9 V nominal regulation voltage at 5 mA, with 400 Ω typical differential resistance and 300 mW total power dissipation. It serves as a precision voltage reference or low-power shunt regulator in space-constrained consumer and industrial power management circuits.
For engineers reviewing the BZX585-B3V9,135 datasheet, BZX585-B3V9,135 pinout, BZX585-B3V9,135 application, or BZX585-B3V9,135 equivalent, this device is selected for ultra-small footprint voltage stabilization where thermal resistance to solder point (65 K/W) and low reverse leakage (≤3.0 µA at VR = 1.0 V) are critical design constraints.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 3.82 V to 3.98 V at IZ = 5 mA, exhibiting a negative temperature coefficient of −3.5 mV/K to −1.9 mV/K across its operating current range. Its low 400 Ω differential resistance ensures stable regulation under small load variations.
The device supports non-repetitive surge handling up to 40 W for 100 µs square-wave pulses at Tj = 25 °C, while maintaining junction temperatures within −65 °C to +150 °C limits. Thermal resistance from junction to solder point is 65 K/W, enabling reliable operation on FR4 PCBs with minimal copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V at IZ = 5 mA - defines precise shunt regulation point for low-voltage biasing |
| Zener Voltage Tolerance | ±2 % - enables tighter output voltage control vs. ±5 % variants in precision references |
| Differential Resistance | 400 Ω typ. at IZ = 5 mA - determines regulation stiffness against current fluctuations |
| Total Power Dissipation | 300 mW at Tamb = 25 °C - sets maximum continuous DC power handling on standard FR4 |
| Reverse Leakage Current | ≤3.0 µA at VR = 1.0 V - ensures minimal quiescent current in standby or low-power modes |
| Non-repetitive Peak Power | 40 W for tp = 100 µs - supports transient overvoltage clamping without failure |
| Thermal Resistance j–sp | 65 K/W - allows direct thermal coupling to PCB cathode pad for effective heat transfer |
Pinout & Package
Package: SOD523 (SC-79), ultra-small flat-lead surface-mount plastic package with 2 terminals; dimensions: 1.25 mm × 0.85 mm × 0.65 mm (L × W × H); cathode identified by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; carries reverse breakdown current during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-compact SMD package | SOD523 footprint (1.25 × 0.85 mm) enables placement in high-density portable electronics |
| Low differential resistance | 400 Ω typ. improves voltage stability under varying load currents in feedback networks |
| Controlled temperature coefficient | −3.5 to −1.9 mV/K allows predictable drift compensation in temperature-sensitive references |
| Low reverse leakage | ≤3.0 µA at 1.0 V supports microamp-level standby current budgets in battery-powered systems |
| Robust surge capability | 40 W non-repetitive peak power rating protects downstream circuitry from short-duration transients |
Applications
| USB Port Overvoltage Protection | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamps transient voltages exceeding 5.5 V on USB VBUS lines to prevent damage to connected ICs. IC Role / Device Role / Timing Role: Shunt regulator acting as passive voltage clamp during ESD or hot-swap events. Use Value: 3.9 V Zener voltage ensures clamping occurs well below USB 2.0 max rating (6 V), while 40 W surge rating absorbs IEC 61000-4-2 level 4 pulses. |
Use Scenario: Generates clean, stable reset threshold for 3.3 V microcontrollers during power-up and brownout conditions. IC Role / Device Role / Timing Role: Precision voltage reference feeding comparator input in RC-based reset generator. Use Value: ±2 % tolerance and low 400 Ω rdiff ensure reset assertion remains within 3.2–3.4 V window across temperature and supply variation. |
| IoT Sensor Biasing | LED Current Regulation |
Use Scenario: Provides stable 3.9 V reference for analog front-end amplifiers in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Low-power voltage reference establishing gain-setting node in instrumentation amplifier circuits. Use Value: ≤3.0 µA leakage at 1.0 V minimizes drain on coin-cell batteries; SOD523 size fits compact sensor modules. |
Use Scenario: Sets constant current for indicator LEDs in handheld medical devices via series resistor + Zener bias. IC Role / Device Role / Timing Role: Shunt regulator defining voltage drop across current-setting resistor. Use Value: Tight 3.82–3.98 V range ensures LED current variation <±2 % across unit-to-unit and temperature, improving visual consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C3V9,135 | ±5 % tolerance (vs. ±2 %); otherwise identical package, voltage range, and power ratings | Acceptable where cost sensitivity outweighs tight regulation requirements | Select when budget constraints dominate and ±5 % output variation is acceptable in system margin |
| MMSZ4685T1G | 3.9 V ±5 %, SOD-123 package (2.7 × 1.6 mm), 500 mW Ptot, higher rdiff (~600 Ω) | Larger footprint and higher thermal resistance limit use in ultra-dense layouts | Choose only if existing PCB layout accommodates larger SOD-123 or requires higher continuous power |
Compared with BZX585-C3V9,135, the BZX585-B3V9,135 delivers tighter voltage control essential for precision biasing; versus MMSZ4685T1G, it offers 43 % smaller footprint and 30 % lower differential resistance-critical for miniaturized, low-drift designs.
Availability
BZX585-B3V9,135 is available at Aetrix Electronics and suitable for USB protection circuits, microcontroller reset generation, IoT sensor biasing, and LED current regulation requiring stable component supply with guaranteed long-term sourcing.
Supply support for BZX585-B3V9,135 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 delivering high-performance logic, analog, and discrete components optimized for efficiency, reliability, and miniaturization in high-volume electronics.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for space-constrained voltage regulation and reference applications in consumer, industrial, and computing equipment.
FAQ
What is the maximum continuous forward current rating for BZX585-B3V9,135?
The absolute maximum forward current is 200 mA per limiting values table. However, forward conduction is not its intended operating mode; the device is designed for reverse-bias Zener regulation. Forward voltage is 1.1 V at 100 mA pulse test (tp ≤ 300 µs), confirming suitability only for brief surge conditions-not sustained forward operation.
Can BZX585-B3V9,135 be used in place of a 3.3 V Zener diode?
No-its nominal Zener voltage is 3.9 V (range 3.82–3.98 V at 5 mA), making it unsuitable as a direct replacement for 3.3 V regulation. Using it would result in ~18 % higher regulated voltage, potentially damaging downstream 3.3 V logic. For 3.3 V, BZX585-B3V3,135 (3.3 V ±2 %) is the correct variant.
How does the SOD523 package affect thermal performance compared to SOD-123?
The SOD523 package has a junction-to-solder-point thermal resistance of 65 K/W, significantly lower than typical SOD-123 devices (~120–150 K/W). This enables more efficient heat transfer from the die to the PCB cathode pad, supporting higher transient power handling (40 W) despite its smaller size and lower total power rating (300 mW).
Is BZX585-B3V9,135 automotive qualified?
No-this device is not AEC-Q200 qualified or tested for automotive applications. Nexperia explicitly states in its legal disclaimers that non-automotive qualified products like BZX585-B3V9,135 are unsuitable for safety-critical, life-support, or automotive systems where failure could result in injury or severe damage.
BZX585-B3V9,135 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):
- 3.9 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 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-B3V9,135 FAQ
1.How can I place an order for BZX585-B3V9,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B3V9,135 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-B3V9,135 reliable?
The price and inventory of BZX585-B3V9,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B3V9,135 is usually 5 days.
3.What payment methods are accepted for BZX585-B3V9,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B3V9,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B3V9,135?
BZX585-B3V9,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B3V9,135 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-B3V9,135?
For technical support, including BZX585-B3V9,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B3V9,135 requirements.
6.How does Aetrix verify that BZX585-B3V9,135 is sourced from the original manufacturer or authorized distributors?
All BZX585-B3V9,135 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-B3V9,135 meets industry standards.
7.What is the process for return or replacement of BZX585-B3V9,135?
All BZX585-B3V9,135 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B3V9,135, 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-B3V9,135 part is unused and in its original packaging.
Return procedure for BZX585-B3V9,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585-B3V9,135 Tags
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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