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Nexperia USA Inc. BZX84W-B27F
- Part No.:
- BZX84W-B27F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B27F.pdf
- Description:
- DIODE ZENER 27V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:7,211
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Product details
Overview
BZX84W-B27F from Nexperia is a ±2 % tolerance Zener voltage regulator diode with nominal 27 V breakdown voltage, 300 Ω differential resistance at 2 mA, and 23.4 mV/K temperature coefficient, housed in a SOT323 (SC-70) package for precision voltage reference in low-power analog circuits and power supply feedback paths.
For engineers reviewing the BZX84W-B27F datasheet, BZX84W-B27F pinout, BZX84W-B27F application, or BZX84W-B27F equivalent, this page delivers verified Zener parameters, terminal mapping, thermal behavior, and substitution guidance specific to 27 V ±2 % regulation under 2 mA test current.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable 27 V across its cathode-anode terminals when reverse current exceeds knee threshold. Its ±2 % tolerance ensures tight regulation accuracy for feedback loops requiring minimal drift.
With 300 Ω differential resistance at IZ = 2 mA and 23.4 mV/K temperature coefficient, it delivers predictable voltage stability over temperature and load variations in compact SMT designs where thermal resistance to ambient is 455 K/W on FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 27 V nominal, ±2 % tolerance (26.5–27.5 V range), defines precise regulation point for feedback networks |
| Differential Resistance rdif | 300 Ω at IZ = 2 mA, determines output impedance and load regulation sensitivity |
| Temperature Coefficient SZ | 23.4 mV/K at IZ = 2 mA, quantifies voltage drift per degree Celsius in thermal environments |
| Forward Voltage VF | ≤0.9 V at IF = 10 mA, sets forward conduction loss during polarity-reversal transients |
| Total Power Dissipation Ptot | 275 mW at Tamb = 25 °C on FR4 PCB, limits continuous DC power handling in SOT323 footprint |
| Junction Temperature Tj | 150 °C maximum, defines upper thermal operating limit before permanent degradation |
| Reverse Current IR | 50 nA at VR = 0.7 × VZnom, specifies leakage level below breakdown threshold |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, optimized for high-density PCB layouts and reflow/wave soldering per JEDEC MO-203-AB standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node in Zener bias configuration |
| 2 | Not Connected (n.c.) | Electrically isolated internal pad; no circuit function or routing required |
| 3 | Cathode (K) | Reverse-bias terminal; connects to regulated output node in shunt regulator topology |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation than ±5 % variants, reducing need for post-regulation trimming in precision references |
| 27 V nominal working voltage | Targets mid-range industrial supply monitoring and 24 V system overvoltage clamping applications |
| 300 Ω differential resistance at 2 mA | Minimizes output voltage variation under dynamic load changes in feedback-sensing paths |
| 23.4 mV/K temperature coefficient | Provides predictable, linear drift behavior for compensation in temperature-critical analog stages |
| SOT323 package with n.c. pin | Reduces board area vs. SOT23 while enabling mechanical stability via third non-functional pad |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
|
Use Scenario: Regulating output voltage of isolated DC-DC converters using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener diode provides stable 27 V reference at secondary-side error amplifier input. Use Value: ±2 % tolerance ensures <±0.54 V output deviation, meeting tight regulation specs for industrial 24 V systems. |
Use Scenario: Clamping transient surges on 24 V rail in automotive body control modules. IC Role / Device Role / Timing Role: Shunt device diverts excess energy above 27 V to ground during load-dump events. Use Value: 275 mW power rating supports short-duration clamping without thermal runaway on FR4 PCB. |
| Voltage Reference Generator | Signal Level Translation |
|
Use Scenario: Generating stable bias voltage for op-amp input stages in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Provides low-drift 27 V reference for rail-to-rail comparator thresholds. Use Value: 23.4 mV/K coefficient allows accurate thermal modeling and compensation in 0–70 °C operating range. |
Use Scenario: Shifting logic-level signals between 3.3 V microcontroller and 24 V fieldbus interface. IC Role / Device Role / Timing Role: Zener clamp limits high-side voltage swing to safe 27 V ceiling for level-shifter FET gate drive. Use Value: 0.9 V forward drop enables bidirectional protection without adding series resistance or delay. |
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 | ±5 % tolerance (25.1–28.9 V), higher 500 Ω rdif at 2 mA, same 23.4 mV/K SZ | Acceptable for non-critical regulation where cost priority outweighs accuracy | Select when ±5 % voltage margin suffices and lower unit cost is required |
| MMSZ4683T1G | 27 V ±5 %, 200 Ω rdif at 20 mA, 350 mW Ptot, SOD-123 package | Higher power handling but larger footprint; different thermal resistance (350 K/W) | Choose for higher-current shunt duties where SOT323 thermal limits are exceeded |
Compared with BZX84W-B27F, the BZX84W-C27 trades regulation accuracy for cost, while MMSZ4683T1G offers greater power capacity in a larger package-making the BZX84W-B27F optimal for space-constrained, precision 27 V reference designs.
Availability
BZX84W-B27F is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and voltage reference generator applications requiring stable component supply and consistent ±2 % Zener tolerance.
Supply support for BZX84W-B27F 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 advanced packaging and automotive-grade solutions.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for precision voltage regulation in compact SMT applications across industrial, consumer, and computing systems.
FAQ
What is the maximum reverse current specification for BZX84W-B27F at its rated Zener voltage?
The BZX84W-B27F exhibits ≤50 nA reverse leakage current at VR = 0.7 × VZnom = 18.9 V, measured at Tj = 25 °C. This ultra-low leakage ensures minimal parasitic loading in high-impedance reference nodes and preserves accuracy in battery-powered sensing circuits.
How does the SOT323 package affect thermal performance compared to SOT23?
The SOT323 package delivers 455 K/W junction-to-ambient thermal resistance on FR4 PCB-approximately 15 % higher than typical SOT23 variants-due to reduced copper pad area and thinner leadframe. This requires derating above 70 °C ambient or use of thermal vias in high-power operation.
Can BZX84W-B27F be used in AC signal clipping applications?
Yes-its symmetric forward voltage (≤0.9 V) and sharp reverse breakdown (27 V) enable bidirectional clipping of analog signals up to ±27 V peak amplitude. The 300 Ω rdif ensures minimal waveform distortion when driven from source impedances >1 kΩ.
What marking code identifies BZX84W-B27F on the device body?
BZX84W-B27F is marked with "K6%" on its top surface, where "K6" denotes the 27 V ±2 % variant and "%" is a placeholder for manufacturing site code. This matches Table 4 in the Nexperia datasheet Rev. 2 (January 2023).
BZX84W-B27F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±2%
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B27F FAQ
1.How can I place an order for BZX84W-B27F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B27F 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-B27F reliable?
The price and inventory of BZX84W-B27F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B27F is usually 5 days.
3.What payment methods are accepted for BZX84W-B27F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B27F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B27F?
BZX84W-B27F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B27F 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-B27F?
For technical support, including BZX84W-B27F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B27F requirements.
6.How does Aetrix verify that BZX84W-B27F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B27F 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-B27F meets industry standards.
7.What is the process for return or replacement of BZX84W-B27F?
All BZX84W-B27F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B27F, 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-B27F part is unused and in its original packaging.
Return procedure for BZX84W-B27F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B27F Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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