My Inquiry
My Account
Nexperia USA Inc. BZX585-C39,115
- Part No.:
- BZX585-C39,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-C39,115.pdf
- Description:
- DIODE ZENER 39V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:6,200
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX585-C39,115 from Nexperia is a 39 V ±5 % Zener voltage regulator diode in SOD523 (SC-79) surface-mount package, rated for 300 mW total power dissipation and 40 W non-repetitive peak reverse power, used for precision voltage reference and overvoltage clamping in low-power analog circuits and microcontroller I/O protection.
For engineers reviewing the BZX585-C39,115 datasheet, BZX585-C39,115 pinout, BZX585-C39,115 application, or BZX585-C39,115 equivalent, this page delivers verified Zener voltage, differential resistance, thermal resistance, cathode/anode terminal mapping, and direct-fit alternatives for compact voltage regulation design.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 39 V at 2 mA test current, exhibiting a typical differential resistance of 80 Ω and temperature coefficient of +33.4 mV/K at that bias point. Its low 350 K/W junction-to-ambient thermal resistance enables stable regulation under transient surge conditions when mounted on FR4 PCB with 35 mm² copper area.
The device features ultra-small SOD523 packaging with cathode marked by a bar, optimized for space-constrained applications requiring fast response to voltage transients. It supports non-repetitive peak reverse currents up to 0.7 A (100 µs square wave, Tj = 25 °C), making it suitable for ESD and surge suppression where precise clamping voltage matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener voltage (VZ) | 37.05 V to 40.95 V at IZ = 2 mA - defines tight clamping window for 3.3 V/5 V rail protection |
| Differential resistance (rdiff) | 80 Ω typ. at IZ = 2 mA - ensures minimal voltage shift under load variation in reference circuits |
| Reverse current (IR) | ≤ 0.05 µA at VR = 29.4 V - guarantees low leakage in high-impedance bias networks |
| Total power dissipation (Ptot) | 300 mW at Tamb = 25 °C - sets maximum continuous DC power handling on standard FR4 layout |
| Non-repetitive peak reverse power (PZSM) | 40 W at tp = 100 µs - enables robust transient suppression without thermal runaway |
| Junction-to-ambient thermal resistance (Rth(j-a)) | 350 K/W - determines steady-state temperature rise above ambient under full DC load |
| Forward voltage (VF) | 1.1 V max at IF = 100 mA - defines conduction loss during forward-biased fault conditions |
Pinout & Package
Package: SOD523 (SC-79), ultra-small flat-lead surface-mount plastic package with cathode identified by a marking bar on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMD package | SOD523 footprint (1.25 × 0.85 mm) enables placement in dense PCB layouts near IC power pins |
| ±5 % Zener voltage tolerance | Supports cost-sensitive designs where tighter tolerance is unnecessary, e.g., non-critical biasing |
| Low differential resistance | 80 Ω typ. minimizes output voltage drift across operating current range in feedback networks |
| High surge capability | 40 W non-repetitive peak power allows single-event transient absorption without degradation |
| Low leakage current | < 0.05 µA at 75 % of VZ preserves signal integrity in high-impedance sensor interfaces |
Applications
| Microcontroller I/O Protection | ADC Reference Stabilization |
|---|---|
|
Use Scenario: Clamping 3.3 V or 5 V GPIO lines against ESD and coupling transients in industrial controllers. IC Role / Device Role / Timing Role: Zener acts as shunt voltage clamp, diverting surge current to ground before IC input exceeds absolute maximum rating. Use Value: 39 V breakdown prevents false triggering while allowing safe margin above 5 V rail; 0.7 A peak current rating handles IEC 61000-4-2 Level 4 events. |
Use Scenario: Providing stable reference voltage for 12-bit SAR ADCs in battery-powered data loggers. IC Role / Device Role / Timing Role: Functions as low-noise, low-drift voltage source in ratiometric reference divider networks. Use Value: 80 Ω differential resistance limits reference error to < 0.2 LSB under 10 µA load variation; ±5 % tolerance aligns with ADC INL spec. |
| Power Supply Overvoltage Detection | Low-Power Sensor Biasing |
|
Use Scenario: Monitoring 24 V DC supply rails in building automation nodes for brownout and overvoltage alarms. IC Role / Device Role / Timing Role: Zener voltage threshold triggers comparator input when rail exceeds safe operating limit. Use Value: 39 V nominal VZ provides 62.5 % headroom above 24 V nominal, accommodating ripple and tolerance stack-up without false trips. |
Use Scenario: Generating bias voltage for photodiode amplifiers in optical smoke detectors. IC Role / Device Role / Timing Role: Supplies fixed reverse bias to photodiode junction, setting depletion region width and responsivity. Use Value: 0.05 µA leakage at 29.4 V ensures sub-nA bias current error; 350 K/W Rth(j-a) maintains <1 °C drift over ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-B39,115 | ±2 % VZ tolerance vs. ±5 %; otherwise identical electrical specs and package | Required where tighter regulation stability is needed, e.g., precision reference dividers | Select BZX585-B39,115 only if system-level calibration or low-tolerance feedback is mandated. |
| MMSZ5255B-7-F | 39 V ±5 %, SOD-123 package (2.7 × 1.6 mm), 500 mW Ptot, higher rdiff (100 Ω) | Used where board space permits larger footprint and higher power margin is required | Choose MMSZ5255B-7-F only when thermal derating or mechanical robustness outweighs size constraints. |
Compared with BZX585-C39,115, the BZX585-B39,115 offers tighter voltage control at no size or thermal penalty, while MMSZ5255B-7-F trades miniaturization for higher power handling and relaxed thermal management-making each optimal for distinct layout and accuracy priorities.
Availability
BZX585-C39,115 is available at Aetrix Electronics and suitable for microcontroller I/O protection, ADC reference stabilization, power supply overvoltage detection, and low-power sensor biasing requiring stable component supply across production volumes.
Supply support for BZX585-C39,115 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, delivering energy-efficient solutions for automotive, industrial, and consumer markets.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, cost-effective voltage regulation and transient suppression in space-constrained, low-power electronic systems.
FAQ
What is the Zener voltage tolerance and test condition for BZX585-C39,115?
The BZX585-C39,115 has a ±5 % Zener voltage tolerance, specified at a test current of 2 mA. Its minimum and maximum Zener voltages are 37.05 V and 40.95 V respectively under those conditions, as confirmed in Table 9 of the official Nexperia datasheet Rev. 8.
Can BZX585-C39,115 be used for continuous DC regulation at 39 V?
No-it is not intended for sustained DC regulation at full Zener voltage. At 39 V, even 7.7 mA would reach its 300 mW power limit. It is designed for low-duty-cycle clamping or reference use with current-limiting resistors; continuous operation requires strict thermal design and derating per Figure 1.
How is the cathode identified on the SOD523 package?
The cathode is marked by a visible bar on the top surface of the SOD523 package, aligned with Pin 1 as shown in Figure 11 of the datasheet. This marking corresponds to the cathode terminal (K) listed in Table 2, and must be oriented toward the higher-potential node in reverse-bias configuration.
What is the maximum non-repetitive peak reverse current rating?
The maximum non-repetitive peak reverse current is 0.7 A, measured under 100 µs square-wave pulse conditions at Tj = 25 °C prior to surge, derived from the 40 W PZSM rating and nominal 39 V VZ (40 W ÷ 39 V ≈ 1.03 A, conservatively limited to 0.7 A per Table 9).
BZX585-C39,115 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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-C39,115 FAQ
1.How can I place an order for BZX585-C39,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-C39,115 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-C39,115 reliable?
The price and inventory of BZX585-C39,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-C39,115 is usually 5 days.
3.What payment methods are accepted for BZX585-C39,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-C39,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-C39,115?
BZX585-C39,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-C39,115 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-C39,115?
For technical support, including BZX585-C39,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-C39,115 requirements.
6.How does Aetrix verify that BZX585-C39,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-C39,115 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-C39,115 meets industry standards.
7.What is the process for return or replacement of BZX585-C39,115?
All BZX585-C39,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-C39,115, 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-C39,115 part is unused and in its original packaging.
Return procedure for BZX585-C39,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585-C39,115 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
