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Nexperia USA Inc. BZX384-A27-QX
- Part No.:
- BZX384-A27-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A27-QX.pdf
- Description:
- DIODE ZENER 27V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:1,841
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Product details
Overview
BZX384-A27-Q from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 27 V nominal breakdown voltage at IZ = 2 mA, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage reference and overvoltage protection circuits.
For engineers reviewing the BZX384-A27-Q datasheet, BZX384-A27-Q pinout, BZX384-A27-Q application, or BZX384-A27-Q equivalent, this device serves as a precision low-power shunt regulator with verified thermal resistance (Rth(j-a) = 415 K/W), non-repetitive surge capability (40 W, 100 μs), and stable temperature coefficient (±0.05 mV/K).
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 27 V reference across its terminals under regulated current conditions. Its differential resistance is ≤300 Ω at IZ = 2 mA, and it exhibits ≤0.5 μA reverse leakage at VR = 22.7 V (85 % of VZ).
Designed for surface-mount use on FR4 PCBs with standard SOD323 footprint, it supports reflow and wave soldering per JEDEC standards and delivers junction-to-ambient thermal resistance of 415 K/W under defined mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 26.73 V to 27.27 V at IZ = 2 mA - tight ±1 % tolerance enables accurate voltage clamping in feedback loops. |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - defines maximum continuous DC power handling on standard FR4 PCB. |
| Differential Resistance (rdif) | ≤300 Ω at IZ = 2 mA - low dynamic impedance ensures minimal output voltage variation under load transients. |
| Reverse Leakage (IR) | ≤0.5 μA at VR = 22.7 V - guarantees high impedance in off-state, minimizing standby current in regulation circuits. |
| Non-repetitive Peak Power | 40 W for 100 μs pulse - supports transient overvoltage suppression without failure in automotive ESD events. |
| Junction Temperature (Tj) | −65 °C to +150 °C - wide operating range validated for under-hood automotive environments. |
| AEC-Q101 Qualified | Yes - certified for automotive discrete semiconductor stress testing including HTGB, HTRB, and temperature cycling. |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with two leads; cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias anode-to-cathode voltage triggers Zener conduction. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes current path during regulation or surge clamping. |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % VZ tolerance | Enables direct replacement in precision feedback networks without recalibration or resistor trimming. |
| AEC-Q101 qualification | Validates reliability for automotive body control modules, infotainment power supplies, and ADAS sensor interfaces. |
| 300 mW power rating | Supports stable regulation in low-current bias networks (e.g., op-amp references, microcontroller reset circuits). |
| 40 W non-repetitive surge rating | Withstands ISO 7637-2 pulse 1/2a/3a transients without degradation when used with series impedance. |
| SOD323 footprint | Enables high-density PCB layouts with JEDEC-compliant reflow profile compatibility and automated assembly. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 5 V or 3.3 V supply rails for microcontrollers and CAN transceivers in door modules and lighting controllers. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable bias for LDO error amplifiers and supervisor ICs. Use Value: Maintains <±1 % output accuracy over temperature (−40 °C to +125 °C ambient) due to low temperature coefficient (±0.05 mV/K). |
Use Scenario: Providing precise reference voltage for 12-bit ADCs measuring pressure, temperature, or current in factory automation sensors. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference source replacing larger TO-92 Zeners in space-constrained analog front-ends. Use Value: Delivers <0.5 μA leakage at 85 % VZ, minimizing input bias error in high-impedance divider networks. |
| USB-C Power Delivery Protection | Consumer Audio DC Bias Network |
Use Scenario: Clamping transient voltages on VBUS lines during hot-plug events and ESD strikes in portable chargers. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp absorbing 40 W surges within 100 μs to protect USB-PD controller ICs. Use Value: Survives repeated 1 kV contact ESD (IEC 61000-4-2) due to AEC-Q101 qualification and robust junction design. |
Use Scenario: Setting DC bias points for Class AB audio amplifier inputs and headphone driver stages in smart speakers. IC Role / Device Role / Timing Role: Stable voltage reference for dual-supply rail splitting and op-amp offset nulling networks. Use Value: Achieves <300 Ω differential resistance, reducing sensitivity to current variations in bias dividers feeding high-gain stages. |
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 | ±2 % VZ tolerance (26.5 V–27.5 V), otherwise identical electrical and thermal specs. | Acceptable where system-level calibration compensates for wider voltage spread; lower cost tier. | Select when absolute voltage accuracy is secondary to cost and long-term stability remains critical. |
| MMSZ5258ET1G | ±5 % tolerance (25.65 V–28.35 V), same SOD-123 package, 500 mW Ptot, no AEC-Q101 qualification. | Not suitable for automotive; higher power allows higher current regulation but looser voltage control. | Choose only for non-automotive consumer or industrial designs where AEC-Q101 is not required and cost is primary. |
Compared with BZX384-B27-Q, the A27-Q offers tighter regulation for closed-loop feedback, while MMSZ5258ET1G trades automotive qualification and precision for higher power and broader availability-making the A27-Q optimal for safety-critical or calibrated systems.
Availability
BZX384-A27-Q is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor signal chains, USB-C power protection, and consumer audio bias networks requiring stable component supply and AEC-Q101 compliance.
Supply support for BZX384-A27-Q 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 logic, discrete, and MOSFET devices, headquartered in Nijmegen, Netherlands.
The BZX384-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for precision voltage reference and transient suppression in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse current for reliable operation?
The BZX384-A27-Q is rated for continuous Zener current up to 11.1 mA at 27 V to stay within its 300 mW power limit (P = V × I). At 25 °C ambient on standard FR4 PCB, sustained operation above this current risks thermal runaway due to Rth(j-a) = 415 K/W. Derating is required above 25 °C.
How does the ±1 % tolerance impact circuit calibration?
The ±1 % VZ tolerance (26.73 V–27.27 V) reduces initial calibration effort in feedback networks-for example, enabling single-resistor adjustment in TL431-based regulators instead of multi-turn trimmers. It also improves batch-to-batch consistency in production test yield for automotive ECUs.
Can this diode replace older through-hole Zeners like BZX55C27?
Yes, but only in new SMD designs: BZX384-A27-Q matches BZX55C27's 27 V rating and ±5 % tolerance class, yet offers superior thermal performance (415 K/W vs. ~500 K/W), smaller footprint (SOD323 vs. DO-35), and AEC-Q101 qualification-no direct drop-in mechanical replacement exists due to package incompatibility.
Is derating required for operation at 105 °C ambient temperature?
Yes. With Rth(j-a) = 415 K/W, a 105 °C ambient raises junction temperature by 43.6 °C at full 300 mW dissipation (ΔT = P × Rth). To hold Tj ≤ 150 °C, maximum allowable power drops to 108 mW-requiring Zener current reduction to ≤4 mA. Full derating curves are provided in Section 9 of the datasheet.
BZX384-A27-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:
- ±1%
- 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-A27-QX FAQ
1.How can I place an order for BZX384-A27-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A27-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-A27-QX reliable?
The price and inventory of BZX384-A27-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-A27-QX is usually 5 days.
3.What payment methods are accepted for BZX384-A27-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A27-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A27-QX?
BZX384-A27-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A27-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-A27-QX?
For technical support, including BZX384-A27-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A27-QX requirements.
6.How does Aetrix verify that BZX384-A27-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-A27-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-A27-QX meets industry standards.
7.What is the process for return or replacement of BZX384-A27-QX?
All BZX384-A27-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A27-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-A27-QX part is unused and in its original packaging.
Return procedure for BZX384-A27-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A27-QX Tags
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