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Nexperia USA Inc. BZX585-B4V3,135
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- Part No.:
- BZX585-B4V3,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B4V3,135.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,177
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Product details
Overview
BZX585-B4V3,135 from Nexperia is a ±2 % tolerance Zener diode in SOD523 (SC-79) package, rated for 4.3 V nominal Zener voltage at 5 mA, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power. It delivers low differential resistance (410 Ω typ. at 5 mA) and operates across −65 °C to +150 °C junction temperature for precision voltage reference and regulation in space-constrained consumer and industrial power rails.
For engineers reviewing the BZX585-B4V3,135 datasheet, BZX585-B4V3,135 pinout, BZX585-B4V3,135 application, or BZX585-B4V3,135 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (65 K/W junction-to-solder-point), cathode-marked SOD523 footprint compatibility, and pulse surge capability (100 µs, 40 W).
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled VZ = 4.21–4.39 V at IZ = 5 mA and exhibits a negative temperature coefficient of −3.5 to −1.7 mV/K over 25–150 °C. Its low rdiff (410 Ω typ.) ensures stable regulation under varying load currents.
Designed for surface-mount applications requiring minimal board area, it uses an ultra-small SOD523 package with 0.34 mm lead pitch and cathode band marking. Thermal performance relies on solder-point conduction (Rth(j-sp) = 65 K/W) rather than ambient convection (Rth(j-a) = 350 K/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.21–4.39 V at IZ = 5 mA - defines precise regulation threshold for 3.3 V/5 V rail clamping |
| Tolerance | ±2 % - enables tighter output voltage control vs. ±5 % variants in feedback loops |
| Differential Resistance | 410 Ω typical at 5 mA - minimizes output voltage shift under load current variation |
| Total Power Dissipation | 300 mW at Tamb = 25 °C on FR4 PCB with 35 mm² copper - sets continuous DC bias limit |
| Non-repetitive Peak Power | 40 W for 100 µs square wave - supports transient overvoltage suppression without failure |
| Junction Temperature Range | −65 °C to +150 °C - qualifies for extended industrial and automotive-adjacent environments |
| Forward Voltage | 1.1 V max at IF = 100 mA - defines forward conduction loss during polarity-reversal protection |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead plastic package: 1.25 mm × 0.85 mm body, 0.34 mm lead pitch, cathode marked by bar on terminal 1.
| 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; completes reverse-bias path for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-compact SMD footprint | SOD523 (1.25 × 0.85 mm) enables placement in dense portable electronics layouts |
| Low differential resistance | 410 Ω typical at 5 mA improves regulation accuracy under dynamic load changes |
| High surge robustness | 40 W non-repetitive peak power withstands ESD and inductive switching transients |
| Precision voltage tolerance | ±2 % ensures consistent reference stability across production batches |
| Wide operating temperature | −65 °C to +150 °C junction range supports reliability in unheated enclosures and hot-running systems |
Applications
| USB Port Overvoltage Protection | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamps 5 V USB supply rail during hot-plug transients or adapter overvoltage events. IC Role / Device Role / Timing Role: Zener diode acts as shunt regulator, diverting excess current when VIN exceeds 4.39 V. Use Value: Prevents damage to downstream 3.3 V logic by limiting rail excursion to ≤4.4 V with <100 ns response. |
Use Scenario: Generates clean reset signal for ARM Cortex-M microcontrollers during power-up sequencing. IC Role / Device Role / Timing Role: Provides stable 4.3 V reference to RC-based reset generator IC input. Use Value: Ensures reset assertion remains active until VDD stabilizes above 4.21 V, eliminating brown-out glitches. |
| IoT Sensor Bias Reference | Industrial Analog Front-End Clamp |
Use Scenario: Supplies stable bias voltage to MEMS pressure sensor analog conditioning circuitry. IC Role / Device Role / Timing Role: Functions as low-noise voltage reference in 2.8–3.6 V battery-powered sensor nodes. Use Value: Delivers <±2 % drift over −40–+85 °C ambient, enabling sub-0.5 % full-scale measurement accuracy. |
Use Scenario: Limits input voltage to 12-bit SAR ADC driver stage in PLC analog input modules. IC Role / Device Role / Timing Role: Shunt clamp protecting op-amp inputs against field-wiring faults up to ±40 V. Use Value: Absorbs 40 W surges without degradation, maintaining signal integrity during 2 kV EFT bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C4V3,115 | ±5 % tolerance (4.09–4.52 V), higher rdiff (600 Ω max), same SOD523 package | Acceptable where cost sensitivity outweighs tight regulation needs | Select for non-critical biasing where ±5 % VZ drift is tolerable |
| MMSZ4V3T1G | ±5 % tolerance, 500 mW Ptot, SOD-123 package (2.7 × 1.4 mm) | Requires larger PCB area but handles higher continuous power | Choose when thermal margin >300 mW is required and board space permits larger footprint |
Compared with BZX585-C4V3,115, the BZX585-B4V3,135 offers tighter voltage control critical for precision references; versus MMSZ4V3T1G, it trades 200 mW lower power rating for 55 % smaller board area-ideal for wearables and miniaturized edge sensors.
Availability
BZX585-B4V3,135 is available at Aetrix Electronics and suitable for USB power protection, microcontroller reset circuits, IoT sensor biasing, and industrial analog front-end clamping requiring stable component supply across high-mix, low-volume production runs.
Supply support for BZX585-B4V3,135 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-performance, reliable standard products including logic, discretes, MOSFETs, and diodes for automotive, industrial, and consumer markets.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for compact, high-reliability voltage regulation in space-constrained SMD designs.
FAQ
What is the maximum continuous reverse current for BZX585-B4V3,135?
The device supports up to 200 mA forward current (IF), but its continuous reverse (Zener) current is limited by thermal design. At 25 °C ambient on FR4 with 35 mm² copper, maximum IZ ≈ 70 mA ensures Ptot ≤ 300 mW. Derating is required above 25 °C per Rth(j-a) = 350 K/W.
How does the cathode marking align with PCB layout for SOD523?
The cathode (terminal 1) is identified by a visible bar on the device body, aligned with the silkscreen "K" or shaded pad on the PCB footprint. In the SOD523 outline, the cathode pad is the leftmost pad when the marking bar faces upward-matching Nexperia's recommended reflow land pattern (Fig. 12).
Can BZX585-B4V3,135 replace BZX585-B4V7,135 in existing designs?
No direct substitution is recommended: BZX585-B4V7,135 has VZ = 4.61–4.79 V and different temperature coefficient (−3.5 to −1.2 mV/K). Swapping alters regulation threshold by ~0.35 V and changes thermal drift behavior, potentially causing reset timing errors or overvoltage exposure.
Is this Zener diode suitable for automotive applications?
BZX585-B4V3,135 is not AEC-Q200 qualified. While its −65 °C to +150 °C junction rating meets some under-hood temperature requirements, Nexperia explicitly states non-automotive qualification unless otherwise specified-making it appropriate only for consumer, industrial, and commercial systems.
BZX585-B4V3,135 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):
- 4.3 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-B4V3,135 FAQ
1.How can I place an order for BZX585-B4V3,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B4V3,135 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-B4V3,135 reliable?
The price and inventory of BZX585-B4V3,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B4V3,135 is usually 5 days.
3.What payment methods are accepted for BZX585-B4V3,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B4V3,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B4V3,135?
BZX585-B4V3,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B4V3,135 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-B4V3,135?
For technical support, including BZX585-B4V3,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B4V3,135 requirements.
6.How does Aetrix verify that BZX585-B4V3,135 is sourced from the original manufacturer or authorized distributors?
All BZX585-B4V3,135 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-B4V3,135 meets industry standards.
7.What is the process for return or replacement of BZX585-B4V3,135?
All BZX585-B4V3,135 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B4V3,135, 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-B4V3,135 part is unused and in its original packaging.
Return procedure for BZX585-B4V3,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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