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Nexperia USA Inc. BZX84W-C39-QX
- Part No.:
- BZX84W-C39-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C39-QX.pdf
- Description:
- DIODE ZENER 39V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,267
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Product details
Overview
BZX84W-C39-QX from Nexperia is a ±5 % tolerance Zener diode with 39 V nominal regulation voltage, 350 Ω typical differential resistance at 2 mA, and 36.4 mV/K temperature coefficient, housed in SOT323 (SC-70) package for precision voltage reference in automotive power supply rails.
For engineers reviewing the BZX84W-C39-QX datasheet, BZX84W-C39-QX pinout, BZX84W-C39-QX application, or BZX84W-C39-QX equivalent, this part supports stable 39 V clamping in ECU voltage supervisors, battery management overvoltage protection circuits, and high-frequency noise filtering in ADAS sensor interfaces.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 39 V reference across load variations, with 130 Ω maximum differential resistance at IZ = 2 mA and 0.7 × 39 V = 27.3 V minimum reverse voltage for specified leakage (≤50 nA).
Its thermal resistance of 455 K/W (junction-to-ambient, FR4 PCB) and 150 °C max junction temperature enable reliable operation in under-hood automotive environments, while its 0.7 pF capacitance at 1 MHz supports high-frequency decoupling roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 39 V ±5 % - precise regulation point for 3.3 V/5 V/12 V system rail monitoring |
| Differential Resistance | 350 Ω max at IZ = 2 mA - low impedance ensures minimal voltage shift under load transients |
| Reverse Leakage Current | 50 nA max at VR = 27.3 V - enables ultra-low standby power in always-on vehicle modules |
| Total Power Dissipation | 275 mW at Tamb = 25 °C - sufficient for continuous biasing in low-current reference circuits |
| Forward Voltage | 0.9 V max at IF = 10 mA - defines forward conduction threshold for polarity-sensitive protection layouts |
| Non-repetitive Peak Power | 40 W at tp = 100 µs - handles ESD transients per ISO 10605 without degradation |
| Junction Temperature Range | −55 °C to +150 °C - qualified for engine bay and transmission control unit mounting locations |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, optimized for automated placement and reflow soldering on FR4 PCBs with standard footprint (2.65 mm × 1.35 mm body, 0.65 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node; reverse-biased during Zener operation |
| 2 | Not Connected (n.c.) | Internally unconnected terminal; must remain floating in PCB layout |
| 3 | Cathode (K) | Connected to higher-potential node; carries regulated current during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Low dynamic impedance | 350 Ω max ensures <±10 mV output variation across 0.5–5 mA operating range |
| High-temperature stability | +36.4 mV/K coefficient enables predictable drift compensation in thermal-aware designs |
| Ultra-low leakage | 50 nA at 27.3 V allows use in micropower wake-up circuits without battery drain penalty |
Applications
| Engine Control Unit (ECU) Voltage Supervisor | Automotive Camera Module Power Clamp |
|---|---|
Use Scenario: Monitors 12 V battery rail for undervoltage/overvoltage faults before microcontroller boot. IC Role / Device Role / Timing Role: Zener reference input to comparator circuit detecting >15.5 V overvoltage condition. Use Value: 39 V rating provides 2.5× margin above nominal 12 V rail, ensuring robust detection despite ripple and load dump spikes. |
Use Scenario: Clamps transient surges on 5 V imaging sensor power line during hot-plug events. IC Role / Device Role / Timing Role: Shunt protection device absorbing ISO 7637-2 pulse 5a energy before it reaches CMOS image sensor. Use Value: 40 W non-repetitive peak power rating withstands 100 µs pulses up to 10 A without parametric shift. |
| ADAS Radar Signal Chain Bias Reference | Infotainment System USB Port Overvoltage Protection |
Use Scenario: Provides stable bias voltage for LNA gain control in 77 GHz radar front-end. IC Role / Device Role / Timing Role: Low-noise Zener reference feeding DAC-controlled current source for RF amplifier biasing. Use Value: 0.7 pF capacitance minimizes RF coupling into bias network, preserving signal integrity above 1 GHz. |
Use Scenario: Protects USB 2.0 PHY from 24 V jump-start transients coupled through shared vehicle harness. IC Role / Device Role / Timing Role: Fast-acting shunt clamp placed between VBUS and GND on Type-A connector PCB. Use Value: 150 °C junction rating ensures survival during sustained 125 °C under-dash ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C39-Q | Same electrical specs but unmarked variant; no traceability code 'X' in suffix | Identical function; lacks lot-level traceability required for Tier-1 automotive audits | Select when full production traceability is not mandated by OEM quality plan |
| MMSZ5241B-TP | 39 V ±5 %, 500 mW Ptot, SOD-123 package, 600 Ω rdif at 20 mA | Higher power rating but larger footprint and higher dynamic impedance reduces regulation accuracy | Choose only if board space permits larger package and 20 mA bias current is available |
Compared with BZX84W-C39-QX, the BZX84W-C39-Q omits manufacturing traceability while maintaining identical performance, whereas MMSZ5241B-TP trades SOT323 miniaturization for higher power handling and relaxed regulation precision.
Availability
BZX84W-C39-QX is available at Aetrix Electronics and suitable for automotive ECU design, ADAS sensor interface development, and infotainment system power protection requiring stable component supply with full AEC-Q101 compliance documentation.
Supply support for BZX84W-C39-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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZX84W-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for stable voltage reference and transient suppression in harsh-temperature vehicle subsystems.
FAQ
What is the marking code for BZX84W-C39-QX?
The marking code for BZX84W-C39-QX is U2%, where 'U' denotes the 39 V Zener voltage and '2%' indicates the ±5 % tolerance grade per Nexperia's standardized coding scheme in Table 4 of the datasheet.
Can BZX84W-C39-QX replace BZX84-C39 in existing designs?
No - BZX84W-C39-QX uses SOT323 (SC-70) packaging with three terminals (including n.c.), while legacy BZX84-C39 uses SOT23 with two active pins; PCB footprint, thermal profile, and assembly process are incompatible without redesign.
What is the maximum surge current BZX84W-C39-QX can handle?
At tp = 100 µs, BZX84W-C39-QX sustains up to 1.02 A peak reverse current (calculated from PZSM = 40 W and VZ ≈ 39 V), verified per IEC 61000-4-5 surge test conditions in the datasheet's limiting values table.
Is the n.c. pin on BZX84W-C39-QX electrically isolated or internally tied?
Pin 2 is explicitly designated "not connected" in Table 2 and the simplified outline diagram; it is fully isolated from internal die structures and must remain unconnected in PCB layout to prevent parasitic coupling or mechanical stress-induced failure.
BZX84W-C39-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):
- 39 V
- Tolerance:
- ±5.13%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-C39-QX FAQ
1.How can I place an order for BZX84W-C39-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C39-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-C39-QX reliable?
The price and inventory of BZX84W-C39-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-C39-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-C39-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C39-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C39-QX?
BZX84W-C39-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C39-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-C39-QX?
For technical support, including BZX84W-C39-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C39-QX requirements.
6.How does Aetrix verify that BZX84W-C39-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-C39-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-C39-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-C39-QX?
All BZX84W-C39-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C39-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-C39-QX part is unused and in its original packaging.
Return procedure for BZX84W-C39-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C39-QX Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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