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Nexperia USA Inc. BZX585-B3V3,135
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- Part No.:
- BZX585-B3V3,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B3V3,135.pdf
- Description:
- DIODE ZENER 3.3V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:101,185
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Product details
Overview
BZX585-B3V3,135 from Nexperia is a 3.3 V ±2 % tolerance Zener diode in SOD523 (SC-79) package, rated for 300 mW total power dissipation and 40 W non-repetitive peak reverse power, used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the BZX585-B3V3,135 datasheet, BZX585-B3V3,135 pinout, BZX585-B3V3,135 application, or BZX585-B3V3,135 equivalent, key selection criteria include Zener voltage tolerance (±2 %), differential resistance (350 Ω at IZ = 5 mA), thermal resistance (65 K/W junction-to-solder point), and ultra-small SOD523 footprint for space-constrained PCBs.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 3.3 V reference under regulated current conditions (IZ = 5 mA typical), with low temperature coefficient (−1.8 mV/K) ensuring minimal drift across −65 °C to +150 °C junction temperature range. Its 350 Ω differential resistance at 5 mA supports tight regulation in low-current bias networks.
The device features two-terminal construction with cathode-marked anode-cathode polarity, optimized for surface-mount reflow soldering on FR4 PCBs with ≥35 mm² copper area at cathode tab. It delivers 5.0 µA maximum reverse leakage at VR = 1.0 V and 1.1 V forward voltage at IF = 100 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V nominal, ±2 % tolerance (3.23 V to 3.37 V) - ensures precise clamping in 3.3 V system rails |
| Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C - defines continuous DC power handling on standard FR4 PCB |
| Differential Resistance (rdiff) | 350 Ω at IZ = 5 mA - determines regulation stiffness and output impedance in shunt regulator designs |
| Temperature Coefficient (SZ) | −1.8 mV/K at IZ = 5 mA - quantifies voltage drift per degree, critical for temperature-stable references |
| Reverse Leakage (IR) | 5.0 µA max at VR = 1.0 V - limits standby current in always-on protection circuits |
| Non-repetitive Peak Power (PZSM) | 40 W at tp = 100 µs - enables transient surge suppression without failure |
| Junction-to-Solder Point Rth | 65 K/W - governs thermal rise during pulsed operation when mounted per recommended footprint |
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. Designed for high-density routing and automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; carries reverse breakdown current; marked by bar on package |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-biased path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-compact SOD523 footprint | Enables placement in <1.1 mm² board area - ideal for wearables and miniaturized IoT sensors |
| ±2 % Zener voltage tolerance | Reduces need for post-production trimming in 3.3 V reference chains and LDO feedback networks |
| Low differential resistance (350 Ω) | Minimizes output voltage variation under load shifts up to ±1 mA in shunt regulation applications |
| 65 K/W junction-to-solder-point thermal resistance | Supports reliable 40 W pulse handling without heatsinking when soldered per Nexperia's footprint guidelines |
| −1.8 mV/K temperature coefficient | Delivers <±15 mV drift over 0–70 °C ambient - suitable for industrial-grade voltage references |
Applications
| USB Peripheral Power Clamp | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamps 5 V USB VBUS line to safe level before entering 3.3 V logic interface IC. IC Role / Device Role / Timing Role: Shunt overvoltage protector limiting input to 3.3 V rail during hot-plug transients. Use Value: Prevents damage to downstream logic with 40 W surge rating and 5 µA leakage at 1 V reverse bias. |
Use Scenario: Provides clean 3.3 V reset threshold for ARM Cortex-M0+ microcontrollers. IC Role / Device Role / Timing Role: Precision voltage reference for RC-based reset generator timing network. Use Value: ±2 % tolerance and −1.8 mV/K TC ensure reset assertion remains within 3.2–3.4 V across temperature. |
| IoT Sensor Bias Network | Low-Power ADC Reference |
Use Scenario: Supplies stable 3.3 V bias to MEMS accelerometer and humidity sensor analog front-end. IC Role / Device Role / Timing Role: Low-noise, low-drift shunt regulator replacing active LDO in battery-powered nodes. Use Value: 300 mW rating and 350 Ω rdiff enable regulation at 200 µA quiescent current with <10 mV droop. |
Use Scenario: Sets reference voltage for 12-bit SAR ADC in portable medical monitor. IC Role / Device Role / Timing Role: Passive voltage reference source for ratiometric measurement accuracy. Use Value: 5 µA IR at 1 V and ±2 % VZ support <0.5 LSB error contribution in 3.3 V full-scale conversion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C3V3,135 | ±5 % tolerance (3.14–3.47 V), higher rdiff (500 Ω), same package and Ptot | Acceptable where tighter voltage control is not required, e.g., non-critical supply monitoring | Select for cost-sensitive designs where ±5 % VZ meets system margin requirements |
| MMSZ5226B-7-F | 3.3 V ±5 %, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot, 600 Ω rdiff | Higher power handling but 2.3× larger footprint; less suitable for ultra-dense layouts | Choose when higher continuous power (500 mW) outweighs board space constraints |
Compared with BZX585-C3V3,135, the BZX585-B3V3,135 offers tighter regulation and lower impedance for precision biasing; versus MMSZ5226B-7-F, it trades 200 mW lower Ptot for 55 % smaller footprint and superior thermal performance in thin PCBs.
Availability
BZX585-B3V3,135 is available at Aetrix Electronics and suitable for USB power management, microcontroller reset generation, IoT sensor biasing, and low-power ADC reference applications requiring stable component supply and long-term obsolescence mitigation.
Supply support for BZX585-B3V3,135 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, reliable discrete, logic, and MOSFET devices with focus on efficiency, reliability, and miniaturization.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-precision voltage regulation in space- and power-constrained consumer, industrial, and computing systems.
FAQ
What is the maximum continuous forward current for BZX585-B3V3,135?
The absolute maximum forward current is 200 mA per IEC 60134 limiting values. However, forward conduction is not its intended operating mode; the device is designed for reverse-bias Zener regulation. Forward voltage is specified at 100 mA (1.1 V max), but sustained forward operation above 10 mA risks thermal overstress due to low thermal mass.
Can BZX585-B3V3,135 be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and manufacturing spread, causing current hogging when paralleled. Even matched units will thermally diverge, risking thermal runaway. For higher power, use a single higher-rated Zener or switch to an active shunt regulator topology.
What is the recommended PCB layout for optimal thermal performance?
Mount the device on FR4 with ≥35 mm² copper area connected to the cathode pad, using the reflow footprint in Figure 12 (1.4 mm × 0.4 mm solder lands, 2.15 mm overall length). Avoid thermal relief on cathode pad and ensure solder mask clearance around both terminals to maximize heat transfer to the plane.
How does the −1.8 mV/K temperature coefficient affect regulation accuracy over temperature?
At IZ = 5 mA, the coefficient causes a −1.8 mV shift per °C change in junction temperature. Over a 100 °C range (−50 °C to +50 °C), this yields ±180 mV drift - but actual system-level drift is reduced by self-heating moderation and ambient stabilization. In practice, measured drift in typical PCB mounting is <±30 mV from −40 °C to +85 °C ambient.
BZX585-B3V3,135 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:
- ±2%
- 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-B3V3,135 FAQ
1.How can I place an order for BZX585-B3V3,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B3V3,135 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-B3V3,135 reliable?
The price and inventory of BZX585-B3V3,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B3V3,135 is usually 5 days.
3.What payment methods are accepted for BZX585-B3V3,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B3V3,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B3V3,135?
BZX585-B3V3,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B3V3,135 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-B3V3,135?
For technical support, including BZX585-B3V3,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B3V3,135 requirements.
6.How does Aetrix verify that BZX585-B3V3,135 is sourced from the original manufacturer or authorized distributors?
All BZX585-B3V3,135 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-B3V3,135 meets industry standards.
7.What is the process for return or replacement of BZX585-B3V3,135?
All BZX585-B3V3,135 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B3V3,135, 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-B3V3,135 part is unused and in its original packaging.
Return procedure for BZX585-B3V3,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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