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Nexperia USA Inc. BZX585-C3V3,135
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- Part No.:
- BZX585-C3V3,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-C3V3,135.pdf
- Description:
- DIODE ZENER 3.3V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:104,169
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Product details
Overview
BZX585-C3V3,135 from Nexperia is a 3.3 V ±5 % Zener voltage regulator diode in SOD523 (SC-79) ultra-small SMD package, rated for 300 mW total power dissipation and 40 W non-repetitive peak reverse power, used for precision low-voltage regulation in space-constrained consumer and industrial power rails.
For engineers reviewing the BZX585-C3V3,135 datasheet, BZX585-C3V3,135 pinout, BZX585-C3V3,135 application, or BZX585-C3V3,135 equivalent, this device supports stable 3.3 V reference generation, overvoltage clamping in I/O protection circuits, and biasing in low-current analog stages where thermal resistance to solder point (65 K/W) and differential resistance ≤500 Ω at 5 mA are critical selection criteria.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 3.3 V at 5 mA test current, exhibiting a temperature coefficient of −1.8 mV/K and reverse current ≤5.0 µA at 2.5 V. Its low 350 K/W junction-to-ambient thermal resistance in free air enables reliable operation in thermally unmanaged PCB layouts.
The device features a cathode-marked SOD523 package with two terminals, optimized for reflow soldering per IPC-J-STD-020, and maintains stable regulation across ambient temperatures from −65 °C to +150 °C with a maximum junction temperature of 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.14 V to 3.47 V at IZ = 5 mA - defines precise 3.3 V regulation window under standard test conditions |
| Tolerance | ±5 % - allows predictable voltage deviation for cost-sensitive reference and clamp applications |
| Differential Resistance (rdiff) | ≤500 Ω at IZ = 5 mA - ensures minimal output voltage shift under load variation |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C on FR4 with 35 mm² copper - sets continuous DC power handling limit |
| Non-repetitive Peak Reverse Power (PZSM) | 40 W for tp = 100 µs square wave - enables transient surge suppression without failure |
| Forward Voltage (VF) | 1.1 V at IF = 100 mA - defines forward conduction loss in series protection configurations |
| Junction-to-Solder-Point Thermal Resistance (Rth(j-sp)) | 65 K/W - quantifies thermal path efficiency from die to PCB copper, critical for pulsed-power reliability |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead surface-mount plastic package with cathode band marking; dimensions: 1.25 mm × 0.85 mm × 0.65 mm (L × W × H), 2-terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased operation requires anode at lower voltage than cathode |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-compact SOD523 footprint | Enables high-density layout in wearables, IoT sensors, and portable battery-powered devices |
| Low differential resistance (≤500 Ω) | Maintains tight voltage regulation under varying load currents up to 200 mA forward limit |
| −1.8 mV/K temperature coefficient | Minimizes drift over operating temperature range, supporting stable references in ambient-variable environments |
| 40 W non-repetitive surge capability | Clamps ESD and fast transients without degradation, meeting IEC 61000-4-2 Level 4 requirements when properly decoupled |
| 300 mW continuous power rating | Supports sustained regulation in always-on low-power subsystems such as real-time clock backup rails |
Applications
| USB Interface Protection | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamping 5 V USB VBUS line against ESD and hot-swap transients before entering USB controller IC. IC Role / Device Role / Timing Role: Zener clamp placed between VBUS and GND, conducting only during overvoltage events. Use Value: Limits peak voltage to ≤3.47 V during surges, preventing latch-up or damage to 3.3 V tolerant USB PHY inputs. |
Use Scenario: Generating a clean, temperature-stable 3.3 V reset threshold for ARM Cortex-M microcontrollers. IC Role / Device Role / Timing Role: Reverse-biased Zener referenced to GND, feeding comparator input or RC delay network. Use Value: Delivers ±5 % accuracy and −1.8 mV/K drift, ensuring reset assertion remains valid across −40 °C to +85 °C operating range. |
| Low-Power Sensor Biasing | ADC Reference Stabilization |
Use Scenario: Providing stable 3.3 V bias to MEMS accelerometer analog front-end in battery-operated condition monitoring nodes. IC Role / Device Role / Timing Role: Shunt regulator sourcing bias current while maintaining constant voltage across sensor supply pins. Use Value: 500 Ω differential resistance ensures <10 mV droop at 20 µA load, preserving sensor full-scale accuracy. |
Use Scenario: Stabilizing reference voltage for 12-bit SAR ADC in industrial data acquisition modules. IC Role / Device Role / Timing Role: Low-noise shunt reference replacing higher-cost bandgap ICs in cost-optimized designs. Use Value: 3.3 V ±5 % tolerance and 65 K/W Rth(j-sp) enable stable reference under pulsed conversion loads without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-B3V3,135 | ±2 % tolerance vs. ±5 %; identical package, Zener voltage 3.23–3.37 V | Higher precision required for metrology-grade references or calibration circuits | Select when tighter voltage accuracy outweighs cost sensitivity and board space is constrained |
| MMBZ5226BS-7-F | 3.3 V ±5 %, SOT-323 package (larger footprint), 200 mW Ptot, 30 W PZSM | Lower surge rating and higher thermal resistance (125 K/W) limit use in high-transient environments | Choose only if SOT-323 is already standardized in production and 300 mW/40 W margin is not required |
Compared with BZX585-B3V3,135, this part trades precision for cost and availability; versus MMBZ5226BS-7-F, it delivers 50 % higher surge power and 48 % lower thermal resistance-critical for compact, high-reliability designs.
Availability
BZX585-C3V3,135 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset circuits, low-power sensor biasing, and ADC reference stabilization requiring stable component supply in high-mix, low-volume production.
Supply support for BZX585-C3V3,135 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, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for consumer, industrial, and automotive markets.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for space-constrained voltage regulation and transient suppression in portable and battery-powered electronics.
FAQ
What is the maximum continuous reverse current this Zener can handle?
The BZX585-C3V3,135 has no specified maximum continuous reverse current; instead, its safe operating limit is defined by total power dissipation (300 mW at 25 °C ambient). At 3.3 V Zener voltage, this corresponds to ~91 mA average reverse current. Exceeding this causes junction temperature rise beyond 150 °C, risking permanent degradation.
Can this diode be used in forward conduction mode as a regular rectifier?
No-it is not optimized for forward conduction. While VF is 1.1 V at 100 mA, its forward current rating is limited to 200 mA absolute maximum, and it lacks the soft recovery and low leakage characteristics of dedicated signal diodes. Use only in reverse-biased Zener regulation or clamping roles.
How does the SOD523 package affect thermal performance compared to SOD-123?
The SOD523 package has significantly higher thermal resistance: Rth(j-a) = 350 K/W (free air) versus ~200 K/W for SOD-123. However, its Rth(j-sp) = 65 K/W enables efficient heat transfer to PCB copper when soldered correctly-making it viable for pulsed applications despite smaller size.
Is the 40 W peak power rating applicable for repetitive pulses?
No-the 40 W rating applies only to non-repetitive pulses (tp = 100 µs, square wave, Tj = 25 °C prior to surge). For repetitive operation, average power must stay within 300 mW, and pulse duty cycle must ensure junction temperature remains below 150 °C-typically limiting repetition to <1 Hz at full amplitude.
BZX585-C3V3,135 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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 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-C3V3,135 FAQ
1.How can I place an order for BZX585-C3V3,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-C3V3,135 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-C3V3,135 reliable?
The price and inventory of BZX585-C3V3,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-C3V3,135 is usually 5 days.
3.What payment methods are accepted for BZX585-C3V3,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-C3V3,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-C3V3,135?
BZX585-C3V3,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-C3V3,135 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-C3V3,135?
For technical support, including BZX585-C3V3,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-C3V3,135 requirements.
6.How does Aetrix verify that BZX585-C3V3,135 is sourced from the original manufacturer or authorized distributors?
All BZX585-C3V3,135 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-C3V3,135 meets industry standards.
7.What is the process for return or replacement of BZX585-C3V3,135?
All BZX585-C3V3,135 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-C3V3,135, 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-C3V3,135 part is unused and in its original packaging.
Return procedure for BZX585-C3V3,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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