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Nexperia USA Inc. BZX84W-B27-QF
- Part No.:
- BZX84W-B27-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B27-QF.pdf
- Description:
- DIODE ZENER 27V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,371
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Product details
Overview
BZX84W-B27-QF 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 23.4 mV/K temperature coefficient, housed in SOT323 (SC-70) package for automotive-grade power rail stabilization and reference applications.
For engineers reviewing the BZX84W-B27-QF datasheet, BZX84W-B27-QF pinout, BZX84W-B27-QF application, or BZX84W-B27-QF equivalent, this device serves as a precision voltage clamp in low-power analog circuits, ECU sensor biasing, and CAN transceiver protection where AEC-Q101 qualification, tight voltage tolerance, and thermal stability are required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable 27 V regulation across load and line variations. Its 300 Ω differential resistance ensures predictable voltage deviation under ±1 mA current change at 2 mA test condition.
The +23.4 mV/K temperature coefficient indicates positive drift with junction temperature rise, requiring thermal-aware layout in high-ambient environments. It is rated for 275 mW total power dissipation on FR4 PCB with single-sided copper and standard footprint.
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 rail protection |
| Tolerance | ±2 % - enables tighter system-level voltage margin control vs. ±5 % variants |
| Differential Resistance rdif | 300 Ω max at IZ = 2 mA - determines output impedance and regulation error under dynamic load |
| Temperature Coefficient SZ | +23.4 mV/K - quantifies voltage drift per degree Celsius rise in junction temperature |
| Total Power Dissipation Ptot | 275 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous steady-state power handling |
| Reverse Current IR | 50 nA max at VR = 0.7 × VZnom - ensures minimal leakage in off-state bias networks |
| Junction Temperature Tj | −55 °C to +150 °C - supports operation in under-hood automotive environments |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, 0.65 mm pitch, and 0.25 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node during regulation |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder mask removal required |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node (e.g., supply rail) for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| ±2 % voltage tolerance | Reduces system calibration burden and improves reference accuracy in analog signal chains |
| SOT323 ultra-small footprint | Enables high-density PCB layouts in space-constrained modules like ADAS sensors and infotainment ECUs |
| 275 mW power rating on FR4 | Supports sustained regulation in 3.3 V/5 V auxiliary rails without heatsinking |
| Low 50 nA leakage at 0.7×VZ | Minimizes quiescent current draw in always-on battery-backed circuits |
Applications
| Automotive ECU Voltage Reference | CAN Transceiver Bias Network |
|---|---|
Use Scenario: Providing stable 27 V reference for ADC input scaling and microcontroller internal voltage monitoring in engine control units. IC Role / Device Role / Timing Role: Zener regulator establishing fixed reference potential independent of battery voltage fluctuations (9–16 V). Use Value: Enables ±0.5 % measurement accuracy over −40 °C to +125 °C ambient due to AEC-Q101 qualification and controlled temperature coefficient. |
Use Scenario: Clamping common-mode voltage on CAN_H/CAN_L lines to protect transceiver inputs during load-dump events. IC Role / Device Role / Timing Role: Bidirectional transient suppressor acting as voltage limiter between CAN bus and ground. Use Value: Limits peak common-mode swing to ≤27 V, preventing transceiver latch-up while maintaining <1 ns response time via low capacitance (1.0 pF). |
| Industrial Sensor Signal Conditioning | Low-Power IoT Node Power Rail Clamp |
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining constant 27 V bias across sensor bridge elements. Use Value: Delivers <0.1 % full-scale error contribution over 10-year field life due to low parametric drift and 150 °C max junction rating. |
Use Scenario: Protecting 3.3 V LDO outputs in battery-operated smart meters against reverse polarity and surge coupling. IC Role / Device Role / Timing Role: Reverse-biased Zener absorbing transient energy before it reaches downstream logic. Use Value: Absorbs up to 40 W non-repetitive surges (100 µs pulse) without degradation, extending product lifetime in harsh utility environments. |
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), 80 Ω higher rdif, same package and AEC-Q101 rating | Acceptable where system-level calibration compensates for wider voltage spread | Select when cost sensitivity outweighs need for tight regulation in non-critical bias networks |
| MMSZ5254B-TP | ±5 % tolerance, 27 V nominal, SOD-123 package, 500 mW Ptot, not AEC-Q101 qualified | Limited to industrial/commercial use; unsuitable for automotive under-hood deployment | Choose only for non-automotive designs requiring higher power dissipation and larger board area |
Compared with BZX84W-C27-Q, the BZX84W-B27-QF offers tighter voltage control and lower dynamic impedance for precision references; versus MMSZ5254B-TP, it trades higher power rating for automotive reliability and miniaturization-critical for ECU and ADAS modules.
Availability
BZX84W-B27-QF is available at Aetrix Electronics and suitable for automotive ECU design, CAN bus protection, and industrial sensor conditioning requiring stable component supply, long-term lifecycle assurance, and AEC-Q101 compliance.
Supply support for BZX84W-B27-QF 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 specializing in high-performance, reliable discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX84W-Q series belongs to Nexperia's automotive Zener diode product line, engineered specifically for robust voltage regulation in engine control, body electronics, and ADAS subsystems under extreme thermal and electrical stress.
FAQ
What is the maximum non-repetitive peak reverse power the BZX84W-B27-QF can handle?
The BZX84W-B27-QF sustains up to 40 W of non-repetitive peak reverse power dissipation for 100 µs square-wave pulses at Tamb = 25 °C, as defined in IEC 60134 limiting values. This capability enables effective transient suppression in automotive load-dump scenarios without permanent degradation.
How does the 27 V Zener voltage behave across temperature?
At IZ = 2 mA, the BZX84W-B27-QF exhibits a +23.4 mV/K temperature coefficient, meaning its breakdown voltage increases by approximately 23.4 mV per degree Celsius rise in junction temperature. This positive drift is confirmed in Fig. 6–7 of the datasheet for 27 V devices.
Is Pin 2 electrically functional or a mechanical dummy?
Pin 2 is explicitly designated "n.c." (not connected) in Table 2 of the datasheet and has no internal bond wire or semiconductor connection. It is a mechanical land for package strength and thermal relief-must remain unconnected in PCB layout and assembly.
Can BZX84W-B27-QF replace BZX84W-B24-Q in a 24 V system?
No-BZX84W-B27-QF is rated for 27 V nominal regulation and will not clamp reliably at 24 V. Its minimum VZ is 26.5 V, exceeding typical 24 V rail tolerances. Substituting it risks insufficient clamping during overvoltage events, potentially damaging downstream circuitry.
BZX84W-B27-QF 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-QF FAQ
1.How can I place an order for BZX84W-B27-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B27-QF 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-QF reliable?
The price and inventory of BZX84W-B27-QF 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-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B27-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B27-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B27-QF?
BZX84W-B27-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B27-QF 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-QF?
For technical support, including BZX84W-B27-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B27-QF requirements.
6.How does Aetrix verify that BZX84W-B27-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B27-QF 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-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B27-QF?
All BZX84W-B27-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B27-QF, 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-QF part is unused and in its original packaging.
Return procedure for BZX84W-B27-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B27-QF Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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