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Nexperia USA Inc. BZX585-C43,115
- Part No.:
- BZX585-C43,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-C43,115.pdf
- Description:
- DIODE ZENER 43V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:182
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Product details
Overview
BZX585-C43,115 from Nexperia is a precision Zener voltage regulator diode in SOD523 (SC-79) package, designed for low-power voltage reference and overvoltage protection in space-constrained circuits. It delivers a nominal 43 V Zener voltage at 2 mA test current, ±5 % tolerance, 85 Ω typical differential resistance at IZ = 2 mA, and supports non-repetitive peak reverse power up to 40 W with 100 µs pulse width.
For engineers reviewing the BZX585-C43,115 datasheet, BZX585-C43,115 pinout, BZX585-C43,115 application, or BZX585-C43,115 equivalent, this device serves as a compact, thermally efficient voltage clamp in DC-DC feedback networks, microcontroller supply rail protectors, and analog sensor reference stabilizers where tight voltage regulation and ultra-small footprint are critical.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its temperature coefficient of +41.2 mV/K at IZ = 2 mA indicates positive drift - critical for compensating negative-drift components in mixed-temperature circuits.
Designed for surface-mount reflow assembly on FR4 PCBs with ≥35 mm² copper area at cathode, it achieves 65 K/W junction-to-solder-point thermal resistance and withstands ambient temperatures from −65 °C to +150 °C, enabling use in industrial control and automotive under-hood auxiliary circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40.85 V to 45.15 V at IZ = 2 mA - defines clamping threshold for overvoltage events in 43 V nominal systems |
| Tolerance | ±5 % - allows predictable worst-case voltage margining without binning or calibration |
| Differential Resistance (rdiff) | 85 Ω typical at IZ = 2 mA - determines output impedance and regulation error under dynamic load changes |
| Temperature Coefficient (SZ) | +41.2 mV/K - enables intentional positive drift to offset negative TC of other circuit elements |
| Non-repetitive Peak Reverse Current (IZSM) | 0.6 A at tp = 100 µs - supports transient surge suppression per IEC 61000-4-5 Level 3 |
| Total Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C on FR4 with 35 mm² Cu - sets continuous bias current limit (≤7 mA at 43 V) |
| Reverse Current (IR) | ≤0.05 µA at VR = 30.1 V - ensures minimal leakage in high-impedance reference nodes |
Pinout & Package
Ultra-compact SOD523 (SC-79) plastic surface-mount package: 1.25 mm × 0.85 mm body, 0.65 mm height, cathode marked by bar on top surface. Optimized for automated placement and reflow soldering per IPC-7351B footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; carries reverse current during Zener conduction; thermal path to PCB copper via cathode tab |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes reverse-bias path; minimal thermal contribution |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SOD523 packaging | Enables placement in <1.0 mm board height constraints, such as wearable sensors and stacked PCB modules |
| 40 W non-repetitive surge rating | Withstands 100 µs transients up to 43 V × 0.6 A without degradation - suitable for I/O line ESD hardening |
| ±5 % voltage tolerance | Eliminates need for post-assembly trimming in cost-sensitive consumer power supplies and LED drivers |
| 65 K/W junction-to-solder-point Rth | Permits >200 mW continuous dissipation with minimal board copper - reduces thermal vias and layout complexity |
| −65 °C to +150 °C operating range | Supports deployment in extended-temperature industrial PLCs and outdoor telecom equipment without derating |
Applications
| Power Supply Feedback Reference | Microcontroller I/O Protection |
|---|---|
|
Use Scenario: Stabilizing feedback voltage in isolated flyback converters using TL431-like topology with discrete Zener reference. IC Role / Device Role / Timing Role: Zener diode provides fixed 43 V reference to optocoupler LED anode, setting primary-side regulation threshold. Use Value: Enables accurate 12 V/24 V output regulation within ±3 % across line/load/temperature, replacing larger DO-35 parts. |
Use Scenario: Clamping 48 V CAN bus lines against ESD and load dump surges in automotive body control modules. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed between CAN_H/CAN_L and chassis ground, with cathode tied to protected line. Use Value: Limits voltage excursions to ≤45.2 V during 8 kV contact discharge, preventing transceiver latch-up without adding series resistance. |
| Sensor Signal Conditioning | Industrial Analog Input Protection |
|
Use Scenario: Biasing and protecting bridge-based pressure sensor outputs in HVAC differential pressure transmitters. IC Role / Device Role / Timing Role: Zener referenced to sensor excitation rail, shunting overvoltage spikes before op-amp input stage. Use Value: Maintains signal integrity below 10 µV RMS noise floor while surviving 1 kV fast transients per IEC 61000-4-4. |
Use Scenario: Overvoltage guard on 0–10 V analog inputs of programmable logic controllers receiving signals from remote field devices. IC Role / Device Role / Timing Role: Cathode connected to input node, anode grounded - clamps fault voltages above 43 V to prevent ADC damage. Use Value: Extends system MTBF by blocking >100 V transients without affecting 0.1 % full-scale accuracy at 10 V input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-B43,115 | ±2 % tolerance vs. ±5 %; 60 Ω rdiff at IZ = 5 mA; higher test current shifts VZ to 42.14–43.86 V | Required where tighter regulation (<±0.85 V) is needed in precision references or feedback loops with low-current optocouplers | Select when absolute voltage accuracy outweighs cost sensitivity and board space is not constrained |
| MMSZ5268ET1G | SOD-123 package (2.7 × 1.4 mm); 43 V nominal; ±5 %; 100 Ω rdiff; Ptot = 500 mW; higher thermal mass but 2.5× larger footprint | Better suited for high-ambient-temperature environments (>85 °C) where 300 mW derating limits BZX585-C43,115 performance | Choose when thermal headroom >150 mW is required and PCB real estate permits larger package |
Compared with BZX585-B43,115, the C-grade offers lower cost and sufficient accuracy for non-critical clamping; versus MMSZ5268ET1G, it trades thermal robustness for 60 % smaller area - ideal for wearables and miniaturized IoT edge nodes.
Availability
BZX585-C43,115 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and compact DC-DC converter designs requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX585-C43,115 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 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 specifically for space-constrained voltage regulation and transient protection in consumer, industrial, and automotive electronics.
FAQ
What is the maximum continuous forward current for BZX585-C43,115?
The device is rated for 200 mA maximum forward current per Absolute Maximum Ratings. However, it is intended for reverse-bias Zener operation; forward conduction is only relevant during polarity-reversal fault conditions or circuit startup sequencing, and sustained forward current above 100 mA risks thermal runaway due to low VF (~1.1 V) and limited thermal dissipation.
Can BZX585-C43,115 be used in parallel for higher power handling?
No - Zener diodes exhibit positive temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal instability when paralleled. For higher surge capability, use a single device with appropriate derating or select a higher-rated part like PZM43xx series instead of parallel configurations.
How does the ±5 % tolerance affect regulation accuracy in a 43 V reference circuit?
At 43 V nominal, ±5 % tolerance means actual VZ falls between 40.85 V and 45.15 V at 2 mA. In closed-loop feedback, this introduces up to ±2.65 V output error unless compensated by adjustable compensation networks or digital calibration - acceptable for non-precision clamping but insufficient for metrology-grade references.
Is BZX585-C43,115 suitable for automotive applications?
While rated for −65 °C to +150 °C junction temperature and qualified per AEC-Q200 stress tests, this specific variant is not automotive-qualified per Nexperia's published status. Use only in non-safety-critical automotive subsystems (e.g., infotainment power rails), and verify compliance with OEM-specific requirements before design-in.
BZX585-C43,115 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):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 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-C43,115 FAQ
1.How can I place an order for BZX585-C43,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-C43,115 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-C43,115 reliable?
The price and inventory of BZX585-C43,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-C43,115 is usually 5 days.
3.What payment methods are accepted for BZX585-C43,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-C43,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-C43,115?
BZX585-C43,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-C43,115 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-C43,115?
For technical support, including BZX585-C43,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-C43,115 requirements.
6.How does Aetrix verify that BZX585-C43,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-C43,115 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-C43,115 meets industry standards.
7.What is the process for return or replacement of BZX585-C43,115?
All BZX585-C43,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-C43,115, 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-C43,115 part is unused and in its original packaging.
Return procedure for BZX585-C43,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585-C43,115 Tags
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