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Nexperia USA Inc. BZX84W-B27-QX
- Part No.:
- BZX84W-B27-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B27-QX.pdf
- Description:
- DIODE ZENER 27V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:8,567
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Product details
Overview
BZX84W-B27-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode with 27 V nominal breakdown voltage, 300 Ω typical differential resistance at IZ = 2 mA, and AEC-Q101 qualification for automotive use in SOT323 (SC-70) package. It delivers stable reference voltage in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the BZX84W-B27-QX datasheet, BZX84W-B27-QX pinout, BZX84W-B27-QX application, or BZX84W-B27-QX equivalent, this page provides verified Zener parameters, automotive-grade thermal limits, SOT323 terminal mapping, and direct-fit alternatives for precision voltage regulation designs.
Technical Context
This device operates as a reverse-biased silicon Zener diode with sharp breakdown at 27 V (VZ = 26.5–27.5 V), exhibiting 23.4 mV/K temperature coefficient and 1.0 pF junction capacitance at 1 MHz and 0 V bias. Its non-repetitive peak reverse current capability reaches 50 A under 100 µs pulses.
Designed for high-frequency regulation, it maintains low dynamic impedance (300 Ω max at 2 mA) and supports forward conduction up to 200 mA. Thermal resistance from junction to ambient is 455 K/W on FR4 PCB, limiting continuous dissipation to 275 mW at 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 26.5 V to 27.5 V at IZ = 2 mA - defines precise regulation point for feedback networks |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Differential Resistance (rdif) | 300 Ω max at IZ = 2 mA - determines load regulation error under varying current |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C - sets maximum steady-state thermal budget on standard FR4 |
| Junction Temperature (Tj) | −55 °C to +150 °C - enables operation in under-hood automotive environments |
| Reverse Current (IR) | 50 nA at VR = 0.7 × VZnom - guarantees low leakage in high-impedance bias networks |
| Capacitance (Cd) | 1.0 pF at f = 1 MHz, VR = 0 V - minimizes signal coupling in RF-sensitive regulation paths |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint and 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential side in Zener regulation |
| 2 | Not Connected (n.c.) | Electrically isolated internal pad; no circuit function or routing required |
| 3 | Cathode (K) | Reverse-bias connection point; tied to regulated output node in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| ±2 % voltage tolerance | Reduces need for external trimming in precision reference circuits |
| Low 1.0 pF junction capacitance | Preserves signal integrity in high-frequency switching regulator feedback paths |
| 455 K/W thermal resistance | Enables predictable derating curves for thermal design on standard PCB layouts |
| Non-repetitive 50 A surge rating | Provides transient overvoltage clamping without external TVS devices |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Stabilizing 5 V reference for microcontroller ADC and sensor interfaces in engine bay environments. IC Role / Device Role / Timing Role: Shunt Zener regulator providing low-noise, temperature-stable voltage reference. Use Value: Maintains <±10 mV drift over −40 °C to +125 °C due to 23.4 mV/K coefficient and AEC-Q101 thermal robustness. |
Use Scenario: Setting output voltage in isolated flyback converter feedback loop with optocoupler. IC Role / Device Role / Timing Role: Precision voltage reference for TL431-like secondary-side regulation. Use Value: Delivers 27 V reference with 300 Ω dynamic impedance, minimizing output voltage ripple under load transients. |
| Consumer USB-C PD Protection | Medical Sensor Bias Network |
Use Scenario: Clamping overvoltage on USB-C CC lines during hot-plug events. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing 100 µs surges up to 40 W. Use Value: Limits line voltage to ≤29 V using 50 A non-repetitive surge rating and 275 mW steady-state dissipation. |
Use Scenario: Generating stable bias for low-power analog front-end amplifiers in portable ECG monitors. IC Role / Device Role / Timing Role: Low-leakage (50 nA) voltage reference enabling high-impedance sensor interfacing. Use Value: Ensures <1 µA total bias current draw while maintaining 27 V reference accuracy within ±0.54 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C27-Q | ±5 % tolerance (25.1–28.9 V range) vs. ±2 % (26.5–27.5 V) | Acceptable where tighter regulation not required; higher production yield | Select for cost-sensitive industrial supplies where 1.8 V regulation window is sufficient |
| MMSZ5258B-TP | Same 27 V nominal, but ±5 % tolerance and 500 mW Ptot in SOD-123 | Higher power handling but larger footprint and no AEC-Q101 qualification | Choose when board space allows larger package and automotive qualification is unnecessary |
Compared with BZX84W-B27-QX, BZX84W-C27-Q trades voltage accuracy for cost, while MMSZ5258B-TP offers higher power in a non-automotive package-neither matches the combination of ±2 % tolerance, AEC-Q101, and SOT323 size.
Availability
BZX84W-B27-QX is available at Aetrix Electronics and suitable for automotive ECU designs, industrial power supply feedback loops, and medical sensor bias networks requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84W-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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency and miniaturization.
The BZX84W-Q series targets automotive and industrial voltage regulation, engineered for AEC-Q101 compliance, low-capacitance performance, and SOT323 space-constrained designs.
FAQ
What is the maximum reverse current before breakdown for BZX84W-B27-QX?
At VR = 0.7 × VZnom = 18.9 V, the maximum reverse current is 50 nA. This ultra-low leakage ensures minimal error in high-impedance reference divider networks and preserves battery life in always-on sensor circuits.
Can BZX84W-B27-QX be used in place of a 24 V Zener diode?
No-it is specifically rated for 27 V nominal breakdown (26.5–27.5 V). Substituting for a 24 V Zener would cause over-regulation, potentially damaging downstream circuitry. Use BZX84W-B24-Q (23.5–24.5 V) instead for 24 V applications.
Is the n.c. pin on BZX84W-B27-QX electrically isolated or internally bonded?
Pin 2 is explicitly designated "not connected" in the official pinning table and has no internal bond wire or die connection. It must remain unconnected in PCB layout and carries zero electrical function-no tie-to-ground or floating assumptions apply.
How does thermal resistance affect BZX84W-B27-QX's power handling at 85 °C ambient?
With Rth(j-a) = 455 K/W, junction temperature rise at 275 mW is 125 °C. At 85 °C ambient, Tj reaches 210 °C-exceeding the 150 °C absolute maximum. Derating to ≤150 mW is required for reliable operation at 85 °C ambient.
BZX84W-B27-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W-Q
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±1.85%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.9 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B27-QX FAQ
1.How can I place an order for BZX84W-B27-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-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 BZX84W-B27-QX reliable?
The price and inventory of BZX84W-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 BZX84W-B27-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B27-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B27-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B27-QX?
BZX84W-B27-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-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 BZX84W-B27-QX?
For technical support, including BZX84W-B27-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B27-QX requirements.
6.How does Aetrix verify that BZX84W-B27-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-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 BZX84W-B27-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B27-QX?
All BZX84W-B27-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-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 BZX84W-B27-QX part is unused and in its original packaging.
Return procedure for BZX84W-B27-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B27-QX Tags
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MM5Z5V1ST1G
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