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Nexperia USA Inc. BZX84W-C75-QF
- Part No.:
- BZX84W-C75-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C75-QF.pdf
- Description:
- DIODE ZENER 74.5V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,717
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Product details
Overview
BZX84W-C75-QF from Nexperia is a ±5 % tolerance Zener voltage regulator diode with nominal 75 V regulation, 275 mW power dissipation, and SOT323 (SC-70) surface-mount package, designed for precision voltage reference and overvoltage protection in automotive power rails and high-frequency signal conditioning circuits.
For engineers reviewing the BZX84W-C75-QF datasheet, BZX84W-C75-QF pinout, BZX84W-C75-QF application, or BZX84W-C75-QF equivalent, key selection criteria include Zener voltage tolerance (±5 %), differential resistance (500 Ω at IZ = 2 mA), temperature coefficient (+80.2 mV/K), junction-to-ambient thermal resistance (455 K/W), and AEC-Q101 qualification status.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable 75 V across its terminals under regulated current conditions (IZ = 2 mA). Its positive temperature coefficient (+80.2 mV/K) ensures predictable voltage drift with rising junction temperature, critical for thermal stability in automotive under-hood environments.
The device features low reverse leakage (50 nA at VR = 52.5 V), non-repetitive peak reverse power capability of 40 W (tp = 100 µs), and 0.2 pF junction capacitance at 1 MHz and 0 V bias - enabling use in fast transient suppression and RF-biasing applications without signal distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V nominal, ±5 % tolerance (70.0–79.0 V range); defines precise clamping threshold for overvoltage protection. |
| Differential Resistance (rdif) | 500 Ω at IZ = 2 mA; determines regulation stiffness - lower values yield tighter voltage control under load variation. |
| Temperature Coefficient (SZ) | +80.2 mV/K at IZ = 2 mA; quantifies voltage drift per degree rise - enables thermal compensation design in wide-temperature systems. |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; sets maximum continuous DC power handling under standard mounting conditions. |
| Reverse Leakage Current (IR) | 50 nA at VR = 52.5 V (0.7 × VZnom); ensures minimal standby current in high-impedance bias networks. |
| Junction-to-Ambient Thermal Resistance (Rth(j-a)) | 455 K/W in free air on FR4; defines thermal bottleneck for derating - limits usable power at elevated ambient temperatures. |
| Non-Repetitive Peak Reverse Power (PZSM) | 40 W for tp = 100 µs pulses; supports transient surge suppression without permanent degradation. |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint dimensions 2.2 mm × 1.35 mm × 0.95 mm (L × W × H), optimized for automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node during regulation - must be held ≤ (cathode − 75 V) to activate Zener action. |
| 2 | Not Connected (n.c.) | Internally unconnected; no electrical function - must remain floating or grounded per layout best practices to avoid parasitic coupling. |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node - carries full Zener current during regulation and defines reference voltage node. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability - supports operation from −55 °C to +150 °C ambient and withstands mechanical/thermal stress per discrete semiconductor standard. |
| ±5 % Zener voltage tolerance | Guarantees 70.0–79.0 V regulation window at 25 °C - enables robust voltage referencing where tight absolute accuracy is less critical than consistency across production lots. |
| Low junction capacitance | 0.2 pF at 1 MHz and 0 V bias - minimizes signal loading in RF coupling, snubbing, and high-speed feedback paths. |
| High surge capability | 40 W non-repetitive peak reverse power (100 µs pulse) - provides immunity against ESD and load-dump transients in 12 V/24 V vehicle systems. |
Applications
| Automotive Power Rail Protection | High-Frequency Bias Reference |
|---|---|
Use Scenario: Clamping 12 V/24 V battery-supplied ECUs against load dump transients up to 60 V. IC Role / Device Role / Timing Role: Zener shunt regulator providing passive overvoltage protection upstream of LDOs and microcontrollers. Use Value: Limits voltage excursions to ≤79.0 V (max VZ + tolerance) while dissipating <275 mW continuously - avoids need for active crowbar circuits. |
Use Scenario: Establishing stable DC bias point for RF amplifier stages operating at 100 MHz–3 GHz. IC Role / Device Role / Timing Role: Low-capacitance voltage reference anchoring gate/base bias networks in GaN/SiGe front-end modules. Use Value: 0.2 pF capacitance prevents RF signal attenuation; +80.2 mV/K TC allows predictable thermal drift compensation in temperature-stable designs. |
| Industrial Sensor Signal Conditioning | Programmable Logic Supply Clamp |
Use Scenario: Regulating excitation voltage for 4–20 mA loop-powered pressure sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Precision Zener reference stabilizing op-amp feedback networks in analog front-ends. Use Value: ±5 % tolerance ensures repeatable sensor output scaling; 50 nA leakage avoids error contribution in µA-level current loops. |
Use Scenario: Protecting FPGA I/O banks rated for 3.3 V or 2.5 V from accidental 5 V or 12 V misconnection during board bring-up. IC Role / Device Role / Timing Role: Fast-acting clamp limiting voltage to ≤79.0 V before downstream ESD structures activate. Use Value: 40 W surge rating absorbs energy from human-body-model (HBM) ESD events without failure - extends board-level test margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B75-Q | ±2 % tolerance (73.5–76.5 V), lower rdif (450 Ω), identical package and Ptot. | Narrower regulation window improves accuracy in precision references but increases cost and reduces availability. | Select when absolute voltage accuracy dominates over cost and supply chain flexibility. |
| MMSZ5265ET1G | 75 V ±5 %, SOD-123 package, 500 mW Ptot, higher thermal resistance (357 K/W), no AEC-Q101 qualification. | Larger footprint and higher power rating suit industrial power supplies; lacks automotive qualification. | Choose for non-automotive applications requiring higher continuous power or legacy SOD-123 compatibility. |
Compared with BZX84W-C75-QF, the BZX84W-B75-Q offers tighter voltage control at the expense of reduced tolerance margin and higher unit cost, while MMSZ5265ET1G trades automotive qualification and compact size for greater power headroom and broader industrial acceptance.
Availability
BZX84W-C75-QF is available at Aetrix Electronics and suitable for automotive power rail protection, high-frequency bias reference, and industrial sensor signal conditioning requiring stable component supply, AEC-Q101 compliance, and SOT323 footprint compatibility.
Supply support for BZX84W-C75-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 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 robust voltage regulation and transient suppression in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse current this diode can handle at 75 V?
The BZX84W-C75-QF is not rated for continuous operation at its full Zener voltage. At 75 V, the maximum steady-state reverse current is limited by power dissipation: IZ(max) = Ptot / VZ = 275 mW / 75 V ≈ 3.67 mA. Exceeding this risks thermal runaway due to its positive temperature coefficient.
Can this Zener diode be used in parallel for higher power handling?
No - parallel connection is not recommended. Manufacturing variations in Zener voltage and temperature coefficient cause current imbalance, leading to thermal runaway in the lower-VZ device. For higher power, use a single higher-rated Zener or an active regulator topology.
Is the "n.c." pin electrically isolated or internally tied to substrate?
Pin 2 is truly not connected - it has no internal bond wire or silicon connection. It is a mechanical pad only, intended for mechanical stability and thermal conduction. No electrical potential should be applied, and it may be left floating or grounded per PCB layout guidelines without affecting regulation performance.
How does the +80.2 mV/K temperature coefficient impact circuit design?
This positive coefficient means VZ increases ~80 mV per Kelvin rise in junction temperature. In high-power or high-ambient applications, this causes measurable voltage drift - e.g., +25 °C ΔT yields +2.0 V shift. Designers must either limit power dissipation, add external compensation, or select a lower-TC Zener if absolute stability is required.
BZX84W-C75-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):
- 74.5 V
- Tolerance:
- ±6.04%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 255 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52.15 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-C75-QF FAQ
1.How can I place an order for BZX84W-C75-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C75-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-C75-QF reliable?
The price and inventory of BZX84W-C75-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-C75-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-C75-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C75-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C75-QF?
BZX84W-C75-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C75-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-C75-QF?
For technical support, including BZX84W-C75-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C75-QF requirements.
6.How does Aetrix verify that BZX84W-C75-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-C75-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-C75-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-C75-QF?
All BZX84W-C75-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C75-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-C75-QF part is unused and in its original packaging.
Return procedure for BZX84W-C75-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C75-QF Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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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
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SMAJ4744A-TP
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SMAZ12-13-F
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