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Nexperia USA Inc. BZX585-B33,115
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- Part No.:
- BZX585-B33,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B33,115.pdf
- Description:
- DIODE ZENER 33V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:1,874
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Product details
Overview
BZX585-B33,115 from Nexperia is a ±2 % tolerance Zener diode in SOD523 (SC-79) package, rated for 33 V nominal regulation voltage, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power at 100 µs pulse width. It serves as a precision voltage reference or overvoltage clamp in low-power analog sensing and power rail stabilization circuits.
For engineers reviewing the BZX585-B33,115 datasheet, BZX585-B33,115 pinout, BZX585-B33,115 application, or BZX585-B33,115 equivalent, this part supports stable 33 V regulation with low differential resistance (75 Ω @ IZ = 2 mA), tight voltage tolerance, and ultra-small footprint for space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 33 V reference across its cathode–anode terminals under controlled current conditions. Its ±2 % tolerance and temperature coefficient of +29.7 mV/K (typical at IZ = 2 mA) enable predictable regulation in ambient temperatures up to +150 °C.
The device features low thermal resistance (Rth(j-sp) = 65 K/W) due to its SOD523 package's solder-point thermal path, and supports surge handling up to 40 W for transient suppression without degradation when mounted on FR4 with ≥35 mm² copper area at the cathode tab.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 33 V - Stable regulation point at IZ = 2 mA, verified per Table 9 |
| Zener Tolerance | ±2 % - Tight voltage accuracy enabling precise reference design without trimming |
| Differential Resistance | 75 Ω (typ) @ IZ = 2 mA - Low dynamic impedance ensures minimal output voltage variation under load changes |
| Total Power Dissipation | 300 mW @ Tamb = 25 °C - Limits continuous DC power handling; requires thermal layout consideration |
| Non-repetitive Peak Reverse Power | 40 W @ tp = 100 µs - Supports short-duration surge clamping in ESD or inductive kickback protection |
| Reverse Current (IR) | 0.05 µA max @ VR = 25 V - Ensures negligible leakage in high-impedance bias networks |
| Junction Temperature Range | −65 °C to +150 °C - Enables operation in extended industrial environments |
Pinout & Package
The BZX585-B33,115 is housed in an SOD523 (SC-79) ultra-small flat-lead surface-mount plastic package measuring 1.25 mm × 0.85 mm × 0.65 mm, with cathode identified by a marking bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; polarity mark determines correct orientation during placement |
| 2 (A) | Anode | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-compact SMD package | SOD523 footprint (1.25 × 0.85 mm) saves board space in wearables and sensor modules |
| Tight voltage tolerance | ±2 % ensures consistent 33 V reference without post-layout calibration |
| Low differential resistance | 75 Ω typical improves regulation stability under varying load currents |
| High surge capability | 40 W non-repetitive peak power supports transient suppression in 3.3 V/5 V rail protection |
| Wide operating temperature | −65 °C to +150 °C junction range allows use in automotive under-hood or industrial control enclosures |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Monitoring |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 12-bit ADC inputs in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 33 V bias to op-amp gain stages and ADC reference dividers. Use Value: ±2 % tolerance and 75 Ω rdiff minimize measurement drift across −40 °C to +85 °C ambient. |
Use Scenario: Clamping feedback voltage on CC line monitoring ICs in USB-C PD sink designs. IC Role / Device Role / Timing Role: Overvoltage protector limiting CC line voltage to safe 33 V level during fault events. Use Value: 40 W surge rating absorbs 100 µs inductive spikes without failure, preserving PD controller integrity. |
| IoT Node Battery Management | Programmable Logic Supply Rail Clamp |
|
Use Scenario: Regulating auxiliary 3.3 V supply derived from Li-ion battery via linear regulator. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining stable 33 V intermediate rail before LDO conversion. Use Value: 0.05 µA IR at 25 V prevents measurable battery drain in sleep modes lasting months. |
Use Scenario: Protecting FPGA I/O bank voltage supervisors from overshoot during hot-swap insertion. IC Role / Device Role / Timing Role: Fast-acting clamp limiting VCCIO to 33 V during plug-in transients. Use Value: SOD523 package enables placement within 2 mm of FPGA ball grid for minimal loop inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C33,115 | ±5 % tolerance, identical package and 33 V nominal voltage | Lower cost for non-critical references where ±2 % is not required | Select when budget constraints outweigh need for tight regulation accuracy |
| MMSZ5261B-7-F | 33 V ±5 %, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot | Larger footprint but higher continuous power handling for thermally demanding layouts | Choose when board space permits and >300 mW steady-state dissipation is needed |
Compared with BZX585-C33,115, the BZX585-B33,115 delivers tighter voltage control at the expense of higher unit cost; versus MMSZ5261B-7-F, it trades off thermal margin and package size for superior miniaturization in ultra-dense designs.
Availability
BZX585-B33,115 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery monitoring, and IoT node battery management requiring stable component supply with traceable sourcing and lifecycle continuity.
Supply support for BZX585-B33,115 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, with leadership in advanced packaging and automotive-qualified components.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-precision voltage regulation in consumer, industrial, and communications equipment where space and accuracy are critical.
FAQ
What is the maximum continuous reverse current the BZX585-B33,115 can sustain?
The device supports a maximum forward current of 200 mA (IF), but for Zener operation, the recommended test current is 2 mA. At that level, it maintains 33 V regulation with 75 Ω differential resistance. Continuous reverse current beyond datasheet-specified limits risks thermal runaway due to its 300 mW total power dissipation ceiling.
How does the marking code 'EH' identify the BZX585-B33,115?
Per Table 4, 'EH' is the unique marking code laser-etched on the SOD523 package surface to denote BZX585-B33. The bar adjacent to pin 1 indicates the cathode. This two-character code enables rapid visual verification during automated optical inspection and manual rework.
Can the BZX585-B33,115 be used in place of a 3.3 V Zener diode?
No - the BZX585-B33,115 is strictly a 33 V nominal Zener diode. Substituting it for a 3.3 V device would result in catastrophic overvoltage at the regulated node. Zener diodes are not interchangeable across voltage ratings; always match nominal VZ and tolerance to circuit requirements.
What is the thermal resistance from junction to solder point (Rth(j-sp)) and why does it matter?
Rth(j-sp) is 65 K/W, measured from the silicon junction to the cathode solder joint. This value directly impacts how effectively heat transfers from the die into the PCB copper. A low Rth(j-sp) enables reliable operation at higher ambient temperatures or pulsed power levels, especially when the cathode pad connects to ≥35 mm² of 1 oz copper.
BZX585-B33,115 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):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 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-B33,115 FAQ
1.How can I place an order for BZX585-B33,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B33,115 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-B33,115 reliable?
The price and inventory of BZX585-B33,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B33,115 is usually 5 days.
3.What payment methods are accepted for BZX585-B33,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B33,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B33,115?
BZX585-B33,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B33,115 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-B33,115?
For technical support, including BZX585-B33,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B33,115 requirements.
6.How does Aetrix verify that BZX585-B33,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-B33,115 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-B33,115 meets industry standards.
7.What is the process for return or replacement of BZX585-B33,115?
All BZX585-B33,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B33,115, 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-B33,115 part is unused and in its original packaging.
Return procedure for BZX585-B33,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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