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Nexperia USA Inc. BZX585-B27,115
- Part No.:
- BZX585-B27,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BZX585-B27,115.pdf
- Description:
- DIODE ZENER 27V 300MW SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:595
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Product details
Overview
BZX585-B27,115 from Nexperia is a 27 V ±2 % Zener voltage regulator 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 reference and overvoltage clamping in space-constrained low-power circuits.
For engineers reviewing the BZX585-B27,115 datasheet, BZX585-B27,115 pinout, BZX585-B27,115 application, or BZX585-B27,115 equivalent, this device serves as a compact, low-capacitance (≤50 pF) Zener solution with 25.3 V to 27.5 V working range at IZ = 2 mA, low differential resistance (65–300 Ω), and negative temperature coefficient (−2.0 to −1.2 mV/K).
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 27 V at 2 mA test current, exhibiting a tight ±2 % tolerance and a temperature coefficient between −2.0 mV/K and −1.2 mV/K across its operating junction temperature range (−65 °C to +150 °C). Its low 50 pF capacitance and 0.05 µA reverse leakage at 20.3 V support high-frequency stabilization and low-noise biasing.
The device delivers stable regulation under transient surges up to 40 W for 100 µs (square wave), with thermal resistance from junction to solder point at 65 K/W when mounted on FR4 PCB with 35 mm² copper area at cathode tab - enabling reliable operation in thermally constrained portable and IoT node designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal at IZ = 2 mA; guaranteed 26.46 V to 27.54 V (±2 %) |
| Power Dissipation (Ptot) | 300 mW at Tamb = 25 °C on FR4 PCB with 35 mm² Cu - defines continuous DC regulation capability |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 µs square wave - supports ESD/transient clamping without failure |
| Differential Resistance (rdiff) | 65 Ω typ. / 300 Ω max. at IZ = 2 mA - determines regulation stiffness and output impedance |
| Reverse Leakage (IR) | ≤0.05 µA at VR = 20.3 V - ensures minimal quiescent current in standby bias networks |
| Junction-to-Solder Thermal Resistance | 65 K/W - enables predictable thermal rise during pulsed operation with direct cathode tab conduction |
| Capacitance (Cd) | 50 pF max. at f = 1 MHz, VR = 0 V - preserves signal integrity in RF-coupled or fast-switching references |
Pinout & Package
SOD523 (SC-79) ultra-small flat-lead surface-mount 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; carries reverse breakdown current |
| 2 | Anode (A) | Connected to circuit ground or lower-potential rail; completes reverse-bias path for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-compact SOD523 package | Enables placement in <1.5 mm² board area - ideal for wearables and miniaturized sensor nodes |
| ±2 % Zener voltage tolerance | Reduces need for post-production trimming in precision reference circuits (e.g., ADC bias, DAC feedback) |
| Low 50 pF junction capacitance | Maintains stability in high-frequency feedback loops and minimizes signal coupling in mixed-signal layouts |
| 65 K/W junction-to-solder thermal resistance | Allows >3× higher pulsed power handling vs. standard SOD323 - critical for surge protection in USB/IO lines |
| −2.0 to −1.2 mV/K temperature coefficient | Provides predictable, linear drift for compensated references - usable in ambient-compensated sensor front-ends |
Applications
| Power Supply Rail Clamp | ADC Reference Stabilization |
|---|---|
|
Use Scenario: Clamping 3.3 V logic supply against ESD or inductive kickback in industrial I/O modules. IC Role / Device Role: Zener acts as shunt overvoltage protector, diverting transients above 27 V to ground before downstream ICs are stressed. Use Value: With 40 W peak surge rating and 65 K/W thermal resistance, it safely absorbs 100 µs pulses without degradation - extending system-level EMC robustness. |
Use Scenario: Providing stable 27 V reference for 16-bit SAR ADC bias network in battery-powered data loggers. IC Role / Device Role: Zener establishes precise, low-drift reference voltage for analog front-end gain-setting resistors. Use Value: ±2 % tolerance and −1.6 mV/K tempco enable <0.05 % full-scale error contribution - meeting 16-bit INL requirements without calibration. |
| Low-Power Sensor Bias | USB-C VBUS Monitoring Divider |
|
Use Scenario: Generating 27 V bias for photodiode transimpedance amplifier in optical smoke detector. IC Role / Device Role: Zener supplies regulated reverse bias to photodiode while minimizing dark current via ultra-low 0.05 µA leakage. Use Value: 50 pF capacitance avoids phase shift in high-gain TIA feedback loop - preserving bandwidth >100 kHz. |
Use Scenario: Scaling 20 V USB-C VBUS down to microcontroller ADC input using resistive divider with Zener clamp. IC Role / Device Role: Zener limits divider node voltage to 27 V during hot-plug transients, protecting MCU GPIO. Use Value: SOD523 footprint fits within 0.5 mm of USB-C connector pad - enabling direct placement without routing stubs. |
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-C27,115 | ±5 % tolerance (25.65–28.35 V), higher rdiff (75–325 Ω), same package and PZSM | Acceptable where 5 % regulation window suffices (e.g., non-critical supply monitoring) | Select for cost-sensitive designs where tighter voltage control is unnecessary |
| MMSZ5256B-7-F | 27 V ±5 %, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot, 200 pF Cd | Higher power but larger footprint and capacitance - unsuitable for high-frequency or space-limited use | Choose only if thermal margin >300 mW is required and board area permits larger package |
Compared with BZX585-C27,115, the BZX585-B27,115 offers tighter voltage control and lower dynamic impedance for precision references; versus MMSZ5256B-7-F, it trades absolute power headroom for 60 % smaller footprint and 4× lower capacitance - making it optimal for miniaturized, high-speed regulation.
Availability
BZX585-B27,115 is available at Aetrix Electronics and suitable for power supply clamping, ADC reference stabilization, low-power sensor biasing, and USB-C VBUS monitoring requiring stable component supply and consistent parametric performance across production batches.
Supply support for BZX585-B27,115 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 solutions optimized for efficiency, size, and thermal performance in consumer, industrial, and automotive applications.
The BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for compact, low-leakage voltage regulation and transient suppression in space- and power-constrained portable and IoT electronics.
FAQ
What is the maximum continuous forward current for BZX585-B27,115?
The absolute maximum forward current is 200 mA per limiting values table. However, forward conduction is not its intended operating mode; sustained forward bias exceeds thermal limits and risks permanent degradation. It must be operated in reverse breakdown for regulation.
Can BZX585-B27,115 be used in place of a 24 V Zener diode?
No - its nominal Zener voltage is 27 V with guaranteed range 26.46 V to 27.54 V. Substituting for a 24 V part would cause over-regulation, potentially damaging downstream components expecting lower voltage. Use BZX585-B24,115 for 24 V applications.
How does the SOD523 package affect thermal performance compared to SOD-323?
The SOD523 has identical footprint to SOD-323 but features an exposed cathode tab that lowers Rth(j-sp) to 65 K/W (vs. ~120 K/W typical for SOD-323), enabling 1.9× higher pulsed power handling and better steady-state thermal dissipation on standard FR4 PCBs.
Is BZX585-B27,115 suitable for automotive applications?
No - this device is not AEC-Q200 qualified. The datasheet explicitly states "non-automotive qualified products" and prohibits use in safety-critical or life-support systems. For automotive-grade Zeners, select Nexperia's Automotive Qualified (AQ) series with documented PPAP and qualification reports.
BZX585-B27,115 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):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.9 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-B27,115 FAQ
1.How can I place an order for BZX585-B27,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX585-B27,115 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-B27,115 reliable?
The price and inventory of BZX585-B27,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX585-B27,115 is usually 5 days.
3.What payment methods are accepted for BZX585-B27,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX585-B27,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX585-B27,115?
BZX585-B27,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX585-B27,115 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-B27,115?
For technical support, including BZX585-B27,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX585-B27,115 requirements.
6.How does Aetrix verify that BZX585-B27,115 is sourced from the original manufacturer or authorized distributors?
All BZX585-B27,115 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-B27,115 meets industry standards.
7.What is the process for return or replacement of BZX585-B27,115?
All BZX585-B27,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX585-B27,115, 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-B27,115 part is unused and in its original packaging.
Return procedure for BZX585-B27,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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