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Nexperia USA Inc. BZX585-B12,115
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- Part No.:
- BZX585-B12,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B12,115.pdf
- Description:
- DIODE ZENER 12V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:3,214
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Product details
Overview
BZX585-B12,115 from Nexperia is a 12 V ±2 % Zener voltage regulator diode in SOD523 (SC-79) ultra-small surface-mount package, designed for precision voltage reference and low-power regulation in space-constrained circuits. It delivers 12.0 V nominal Zener voltage at 5 mA test current, with 25 Ω typical differential resistance and −2.0 to +7.9 mV/K temperature coefficient, enabling stable biasing in sensor interfaces and power supply feedback paths.
For engineers reviewing the BZX585-B12,115 datasheet, BZX585-B12,115 pinout, BZX585-B12,115 application, or BZX585-B12,115 equivalent, this part supports compact DC-DC converter feedback networks, analog signal conditioning references, and overvoltage clamp protection where tight tolerance and low thermal drift are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal 12.0 V regulation point at IZ = 5 mA, exhibiting a typical differential resistance of 25 Ω that ensures minimal output voltage variation under load changes. Its temperature coefficient ranges from −2.0 to +7.9 mV/K, indicating moderate thermal stability across operating junction temperatures.
The device is rated for 300 mW total power dissipation at Tamb = 25 °C on FR4 PCB with 35 mm² copper area, and withstands non-repetitive 40 W surge pulses (tp = 100 µs, square wave), making it suitable for transient suppression in low-energy circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.76 V to 12.24 V at IZ = 5 mA - defines precise regulation window for feedback or reference use |
| Tolerance | ±2 % - enables tighter system-level voltage accuracy vs. ±5 % variants |
| Differential Resistance (rdiff) | 25 Ω typical at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C - sets maximum continuous DC power handling on standard PCB layout |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 µs - supports short-duration surge clamping without failure |
| Forward Voltage (VF) | 1.1 V at IF = 100 mA - defines forward conduction loss in series protection configurations |
| Junction Temperature Range | −65 °C to +150 °C - ensures operation across industrial and extended commercial environments |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead plastic package: 1.25 mm × 0.85 mm footprint, 0.65 mm height, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased during Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low Differential Resistance | 25 Ω typical at 5 mA - minimizes output voltage shift under varying load currents |
| Ultra-Small SMD Package | SOD523 (SC-79) - enables high-density PCB layouts in wearables and IoT edge nodes |
| Precision Voltage Tolerance | ±2 % - reduces need for external trimming in voltage reference designs |
| Controlled Temperature Coefficient | −2.0 to +7.9 mV/K - allows predictable drift compensation in temperature-sensitive analog stages |
| High Surge Withstand | 40 W non-repetitive peak power - provides robustness against ESD and line transients in unregulated inputs |
Applications
| Power Supply Feedback Network | Sensor Bias Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck converter secondary-side feedback loop. IC Role / Device Role / Timing Role: Provides stable 12 V reference to optocoupler input or TL431 shunt regulator control pin. Use Value: ±2 % tolerance ensures <±1% output regulation error before compensation, reducing need for post-production calibration. |
Use Scenario: Supplying excitation voltage to resistive temperature detectors (RTDs) or bridge-based pressure sensors. IC Role / Device Role / Timing Role: Acts as low-noise, low-drift voltage source replacing higher-cost bandgap references in 12 V sensor chains. Use Value: 25 Ω rdiff limits current-induced error to <0.125 mV per 5 µA sensor bias variation, improving measurement resolution. |
| Overvoltage Clamp Protection | Microcontroller I/O Level Shifting |
Use Scenario: Protecting 12 V logic inputs or ADC front-ends from transient overvoltage events. IC Role / Device Role / Timing Role: Clamps reverse voltage to 12.24 V maximum during surges, diverting excess energy to ground. Use Value: 40 W non-repetitive pulse rating absorbs 4 µJ per event (100 µs × 40 W), sufficient for IEC 61000-4-5 Level 2 surges. |
Use Scenario: Translating 3.3 V microcontroller GPIO signals to 12 V interface levels in industrial control modules. IC Role / Device Role / Timing Role: Used in series-anode configuration with pull-up to 12 V, enabling open-drain level translation. Use Value: 1.1 V forward drop at 100 mA ensures <0.1 V logic-high margin at 12 V rail, maintaining noise immunity in noisy environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX585-C12,115 | ±5 % tolerance (11.4 V–12.6 V), same SOD523 package and 25 Ω rdiff | Acceptable where system-level tolerance budget allows >±2 % reference error | Select when cost sensitivity outweighs precision requirement and board layout cannot accommodate larger packages. |
| MMSZ5242B-7-F | 12 V ±5 %, SOD-123 package (2.7 mm × 1.4 mm), 33 Ω rdiff, 500 mW Ptot | Higher power handling but 2.3× larger footprint; less suitable for ultra-dense layouts | Choose when thermal margin is critical and PCB area permits larger SOD-123 placement. |
Compared with BZX585-C12,115, the BZX585-B12,115 offers tighter regulation for feedback-critical systems; versus MMSZ5242B-7-F, it trades 200 mW extra power headroom for 55 % smaller board area-ideal when space constraints dominate thermal design.
Availability
BZX585-B12,115 is available at Aetrix Electronics and suitable for power supply feedback networks, sensor bias references, overvoltage clamp protection, and microcontroller I/O level shifting requiring stable component supply and consistent parametric performance across production batches.
Supply support for BZX585-B12,115 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 leading semiconductor manufacturer specializing in high-performance, reliable discrete and logic devices, with global R&D and manufacturing infrastructure focused on efficiency and miniaturization.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for compact, high-precision voltage regulation in consumer, industrial, and communications equipment where SOD523 footprint and ±2 % tolerance deliver optimal size-performance balance.
FAQ
What is the maximum continuous reverse current the BZX585-B12,115 can sustain at 25 °C ambient?
The device supports up to 25 mA continuous reverse current at 25 °C ambient, calculated from its 300 mW total power dissipation rating and 12.24 V maximum Zener voltage (Ptot/VZ(max) = 300 mW/12.24 V ≈ 24.5 mA). Derating is required above 25 °C per the 350 K/W junction-to-ambient thermal resistance.
How does the cathode marking appear on the BZX585-B12,115 package?
A single dark bar is printed on the top surface of the SOD523 package, aligned with Pin 1 (cathode). This marking is visible under standard optical inspection and matches the simplified outline in Figure 11 of the datasheet, ensuring correct orientation during automated placement and manual rework.
Can the BZX585-B12,115 be used in parallel for higher power dissipation?
No-Zener diodes exhibit negative temperature coefficients below ~5 V and positive above, causing thermal runaway when paralleled. The BZX585-B12,115 has a +6.0 to +10.0 mV/K coefficient, so mismatched units will share current unevenly, risking premature failure of the lowest-VZ unit without external balancing resistors.
What is the typical reverse leakage current at 10 V reverse bias and 25 °C?
At 10 V reverse bias and 25 °C, the typical reverse leakage current is ≤0.1 µA, as shown in Figure 9 of the datasheet for the BZX585-B12 variant. This low IR ensures minimal quiescent current draw in high-impedance reference circuits, preserving battery life in portable applications.
BZX585-B12,115 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):
- 12 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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-B12,115 FAQ
1.How can I place an order for BZX585-B12,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B12,115 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-B12,115 reliable?
The price and inventory of BZX585-B12,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B12,115 is usually 5 days.
3.What payment methods are accepted for BZX585-B12,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B12,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B12,115?
BZX585-B12,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B12,115 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-B12,115?
For technical support, including BZX585-B12,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B12,115 requirements.
6.How does Aetrix verify that BZX585-B12,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-B12,115 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-B12,115 meets industry standards.
7.What is the process for return or replacement of BZX585-B12,115?
All BZX585-B12,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B12,115, 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-B12,115 part is unused and in its original packaging.
Return procedure for BZX585-B12,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX585-B12,115 Tags
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