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Nexperia USA Inc. BZX384-B27-QX
- Part No.:
- BZX384-B27-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B27-QX.pdf
- Description:
- DIODE ZENER 27V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,551
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Product details
Overview
BZX384-B27-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 27 V nominal breakdown voltage at 2 mA test current, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable reference voltage in low-power biasing, overvoltage protection, and voltage-clamping circuits.
For engineers reviewing the BZX384-B27-QX datasheet, BZX384-B27-QX pinout, BZX384-B27-QX application, or BZX384-B27-QX equivalent, this page delivers verified electrical parameters, thermal resistance values, reverse current limits at 25 V, differential resistance under regulation, and automotive-grade reliability context - all confirmed from Nexperia's official Rev. 1 product data sheet dated 6 September 2021.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse-breakdown characteristics. Its 27 V nominal Zener voltage is specified at IZ = 2 mA, with maximum differential resistance of 300 Ω and temperature coefficient of +0.05 mV/K - indicating minimal voltage drift across operating temperature range.
Designed for surface-mount applications on FR4 PCBs, it supports non-repetitive peak reverse power dissipation up to 40 W (100 μs pulse), junction temperature up to 150 °C, and ambient operation from –65 °C to +150 °C. Thermal resistance from junction to ambient is 415 K/W under standard mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.5 V to 27.5 V at IZ = 2 mA - defines precise clamping threshold for 27 V nominal regulation |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets continuous DC power limit on standard FR4 board |
| Differential Resistance (rdif) | ≤300 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | ≤80 μA at VR = 25 V - quantifies leakage before breakdown, critical for low-power standby circuits |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - enables transient surge suppression without damage |
| Junction Temperature (Tj) | 150 °C maximum - defines upper thermal boundary for reliable long-term operation |
| Thermal Resistance (Rth(j-a)) | 415 K/W - links power dissipation to expected temperature rise above ambient |
Pinout & Package
The BZX384-B27-QX is housed in a SOD323 (SC-76) plastic surface-mount package measuring 1.8 mm × 1.35 mm × 0.95 mm, with cathode marked by a bar on the top surface.
| 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 bias path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| ±2 % voltage tolerance | Ensures tight regulation accuracy for precision reference and feedback loop applications |
| Low-profile SOD323 package | Enables high-density PCB layouts while maintaining thermal performance via solder-point conduction |
| 40 W non-repetitive surge rating | Protects downstream circuitry against short-duration transients such as load dump or ESD events |
| 150 °C max junction temperature | Supports operation in under-hood automotive environments and industrial enclosures without derating |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for microcontroller ADC input scaling in door module power management. IC Role / Device Role / Timing Role: Zener clamp providing stable 27 V reference to buffer analog sensor signals before digitization. Use Value: Maintains <1 % reference error across –40 °C to +125 °C ambient, meeting ASIL-B functional safety margin requirements. |
Use Scenario: Overvoltage protection for 24 V supply rail feeding analog front-end ICs in factory automation sensors. IC Role / Device Role / Timing Role: Shunt regulator absorbing transient surges exceeding 30 V to prevent latch-up in op-amps and ADCs. Use Value: Limits rail excursion to ≤27.5 V during 100 μs load-dump events, preserving signal integrity and component lifetime. |
| Consumer Power Adapter Feedback Loop | Telecom Line Interface Protection |
Use Scenario: Secondary-side voltage sensing in isolated flyback converter for USB-C PD compliance. IC Role / Device Role / Timing Role: Precision Zener element setting optocoupler LED current threshold to regulate output voltage. Use Value: Enables ±2 % output regulation accuracy over line/load/temperature, satisfying IEC 62368-1 ripple and stability criteria. |
Use Scenario: DC bias stabilization and surge clamping on RS-485 transceiver VCC pins in outdoor base station equipment. IC Role / Device Role / Timing Role: Low-capacitance (≤50 pF) shunt regulator maintaining clean 27 V bias despite induced lightning-induced transients. Use Value: Prevents transceiver latch-up during 1 kV/μs common-mode surges while adding <0.5 pF parasitic capacitance to signal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B27-Q | Same electrical specs and AEC-Q101 qualification; differs only in marking code (M8 vs QX) and tape/reel packaging variant | Identical functional behavior; suitable for same PCB footprint and thermal design | Select when standard reel packaging (not custom-marked) is acceptable and cost optimization is prioritized |
| MMSZ5254B-7-F | 27 V ±5 % tolerance, 500 mW Ptot, SOD-123 package, no AEC-Q101 certification | Higher power handling but looser tolerance and unqualified for automotive use | Prefer for cost-sensitive industrial power supplies where ±5 % regulation and non-automotive qualification are acceptable |
Compared with BZX384-B27-QX, the BZX384-B27-Q offers identical regulation performance with simplified logistics, while MMSZ5254B-7-F trades automotive reliability and tight tolerance for higher power and lower unit cost - making selection dependent on end-equipment qualification requirements and thermal constraints.
Availability
BZX384-B27-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer power adapter feedback loops, and telecom line protection requiring stable component supply with full traceability and AEC-Q101 compliance.
Supply support for BZX384-B27-QX 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 automotive-qualified components and energy-efficient solutions.
The BZX384-Q series belongs to Nexperia's automotive-grade Zener diode portfolio, engineered specifically for robust voltage reference and clamping in harsh-environment applications including engine control units, ADAS modules, and battery management systems.
FAQ
What is the maximum reverse voltage the BZX384-B27-QX can withstand before breakdown?
The BZX384-B27-QX has a nominal Zener voltage of 27 V, with guaranteed breakdown between 26.5 V and 27.5 V at 2 mA test current. Its reverse current remains ≤80 μA at 25 V, confirming stable non-conduction below the specified knee. The absolute maximum non-repetitive reverse voltage is limited by the 40 W surge rating at 100 μs duration, not a fixed VR(max) value.
Is the BZX384-B27-QX suitable for use in a 125 °C ambient environment?
Yes - the device is rated for ambient temperatures from –65 °C to +150 °C and qualified per AEC-Q101. At 125 °C ambient, derating applies: its 300 mW total power dissipation must be reduced based on thermal resistance (415 K/W) and actual board layout. With proper copper pour and airflow, it sustains full regulation performance up to Tj = 150 °C.
How does the ±2 % tolerance affect circuit accuracy in a feedback divider?
The ±2 % tolerance directly contributes to output voltage error in resistor-divider-based feedback networks. For a 27 V Zener used with 1 % resistors in a 5 V output flyback, worst-case error is ±2.2 % - dominated by the Zener's initial tolerance rather than resistor drift. This makes it appropriate for applications requiring <±3 % overall regulation, such as non-critical power rails or buffered references.
Can the BZX384-B27-QX replace a through-hole 1N5254B in an existing design?
Electrically yes - both regulate near 27 V - but mechanically no without PCB redesign. The BZX384-B27-QX uses SOD323 (1.8 mm × 1.35 mm), while the 1N5254B uses DO-35 (4.5 mm × 2.2 mm). Thermal performance also differs: the SOD323 has higher Rth(j-a) (415 K/W vs ~300 K/W), requiring careful layout review for equivalent power handling and temperature rise.
BZX384-B27-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384-Q
- Package/Case:
- SC-76, SOD-323
- 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:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-B27-QX FAQ
1.How can I place an order for BZX384-B27-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B27-QX 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 BZX384-B27-QX reliable?
The price and inventory of BZX384-B27-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-B27-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B27-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B27-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B27-QX?
BZX384-B27-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B27-QX 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 BZX384-B27-QX?
For technical support, including BZX384-B27-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B27-QX requirements.
6.How does Aetrix verify that BZX384-B27-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B27-QX 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 BZX384-B27-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B27-QX?
All BZX384-B27-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B27-QX, 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 BZX384-B27-QX part is unused and in its original packaging.
Return procedure for BZX384-B27-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B27-QX Tags
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