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Nexperia USA Inc. BZX84W-C75X
- Part No.:
- BZX84W-C75X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C75X.pdf
- Description:
- DIODE ZENER 75V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,800
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Product details
Overview
BZX84W-C75X from Nexperia is a ±5 % tolerance Zener voltage regulator diode with a nominal 75 V breakdown voltage, 500 Ω differential resistance at 2 mA, and 0.2 pF capacitance at 1 MHz; designed for precision voltage reference and overvoltage protection in compact SOT323 surface-mount power management circuits.
For engineers reviewing the BZX84W-C75X datasheet, BZX84W-C75X pinout, BZX84W-C75X application, or BZX84W-C75X equivalent, this part supports stable regulation in low-power analog rails, ESD-protected I/O clamping, and high-frequency biasing where tight voltage tolerance and minimal parasitic capacitance are critical.
Technical Context
This Zener diode operates in reverse-bias breakdown mode with a specified 75 V nominal Zener voltage (VZ) at IZ = 2 mA, exhibiting a positive temperature coefficient of +80.2 mV/K. Its differential resistance (rdif) is 500 Ω under the same test condition, confirming stable regulation behavior across load variations.
The device features ultra-low junction-to-ambient thermal resistance (Rth(j-a) = 455 K/W) when mounted on standard FR4 PCBs and delivers non-repetitive peak reverse power dissipation up to 40 W for 100 µs pulses-enabling transient surge suppression without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V nominal at IZ = 2 mA; defines precise clamping threshold for overvoltage protection |
| Tolerance | ±5 % (C-series); ensures predictable regulation window across production batches |
| Differential Resistance (rdif) | 500 Ω at IZ = 2 mA; determines output impedance and regulation sensitivity to current changes |
| Junction Capacitance (Cd) | 0.2 pF at f = 1 MHz, VR = 0 V; enables use in RF bias networks and high-speed signal path clamping |
| Max Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C; sets continuous DC power handling limit on standard FR4 PCB |
| Reverse Current (IR) | 50 nA at VR = 52.5 V (0.7 × VZnom); confirms low leakage below breakdown threshold |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA; defines forward conduction drop for bidirectional clamp configurations |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals; footprint optimized for reflow soldering per Figure 9 in datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node in reverse-bias configuration; forms cathode-anode voltage reference path |
| 2 | Not Connected (n.c.) | Internally unconnected terminal; must remain floating-no PCB trace or solder mask required |
| 3 | Cathode (K) | Connects to higher-potential node; carries reverse current during Zener conduction; primary reference terminal |
Key Features
| Feature | Design Value |
|---|---|
| Wide Zener voltage range | 2.4 V to 75 V in E24 steps-supports single-family selection across diverse supply rail requirements |
| Low parasitic capacitance | 0.2 pF at 1 MHz-minimizes signal distortion in RF bias and high-frequency clamping applications |
| Thermally robust packaging | Rth(j-a) = 455 K/W on FR4-enables reliable operation without heatsinking in space-constrained designs |
| Precision tolerance options | ±2 % (B-series) and ±5 % (C-series)-allows cost/performance trade-off in voltage reference design |
Applications
| Power Supply Reference | ESD-Protected I/O Clamping |
|---|---|
Use Scenario: Providing stable 75 V reference for feedback divider in isolated DC-DC converters. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix upper rail voltage with minimal drift. Use Value: Tight ±5 % tolerance and low rdif ensure <1 % output voltage error across line/load variations. |
Use Scenario: Bidirectional clamping of industrial sensor interface lines exposed to ±1 kV ESD events. IC Role / Device Role / Timing Role: Paired anode-to-rail and cathode-to-rail to shunt transients above 75 V while blocking normal 24 V operation. Use Value: 0.2 pF capacitance prevents signal integrity degradation on 10 MHz analog sensor outputs. |
| High-Frequency Bias Network | Overvoltage Protection for MCU Peripherals |
Use Scenario: Biasing gate of RF MOSFET in 2.4 GHz PA stage using 75 V Zener-stabilized drain supply. IC Role / Device Role / Timing Role: Zener diode regulating DC bias point while presenting negligible capacitive loading to RF path. Use Value: Sub-0.3 pF Cd avoids resonance shift or gain loss in narrowband matching networks. |
Use Scenario: Protecting 3.3 V ADC input pins against accidental 75 V fault injection in factory automation PLC modules. IC Role / Device Role / Timing Role: Cathode tied to 3.3 V rail, anode to input-clamps reverse surges to −0.9 V and forward surges to 75 V. Use Value: 275 mW Ptot rating sustains 100 ms overvoltage without thermal failure per IEC 61000-4-5. |
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 | ±2 % tolerance (vs. ±5 %); 475 Ω rdif at 2 mA; identical VZ, package, and thermal specs | Higher precision reference needed for metrology-grade feedback loops | Select when tighter voltage accuracy justifies ~15 % cost premium and lower production yield sensitivity |
| MMBZ5270B | 75 V nominal, ±5 %, but SOT23 package; 700 Ω rdif; 225 mW Ptot; 2.5 pF Cd | Legacy board redesign where SOT23 footprint is fixed and RF performance is non-critical | Choose only if SOT323 re-layout is prohibited; accept 12× higher capacitance and 18 % lower power rating |
Compared with BZX84W-C75X, BZX84W-B75 offers superior voltage accuracy at identical thermal and RF performance, while MMBZ5270B trades significant capacitance and power derating for SOT23 compatibility-making the C75X optimal for new designs prioritizing high-frequency stability and thermal margin.
Availability
BZX84W-C75X is available at Aetrix Electronics and suitable for industrial sensor interfaces, programmable logic controller (PLC) I/O protection, and RF power amplifier bias networks requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX84W-C75X 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.
BZX84W-C75X belongs to the BZX84W series of general-purpose Zener diodes engineered for compact, high-reliability voltage regulation and transient suppression in space-constrained SMT applications.
FAQ
What is the maximum continuous reverse current the BZX84W-C75X can sustain at 75 V?
The BZX84W-C75X is not rated for continuous conduction at its Zener voltage. At VR = 75 V, it operates in breakdown with IZ = 2 mA per datasheet test condition. Sustained current must be limited by external series resistance to keep Ptot ≤ 275 mW-yielding a practical max IZ of ~3.6 mA at full 75 V.
Can BZX84W-C75X be used in bidirectional TVS configurations?
No-it is a unidirectional Zener diode. For bidirectional clamping, two BZX84W-C75X units must be connected anode-to-cathode (back-to-back). This achieves ±75 V clamping but doubles capacitance and requires careful layout to avoid parasitic coupling; dedicated bidirectional TVS diodes are preferred for ESD compliance.
How does the 0.2 pF junction capacitance impact 100 MHz signal paths?
At 100 MHz, the 0.2 pF capacitance presents a reactance of ~7.9 kΩ, making it electrically invisible in series with typical 50 Ω RF traces. It introduces negligible phase shift or attenuation-verified in Nexperia's application note AN11520 for HF bias network use cases up to 2.4 GHz.
Is the n.c. pin (pin 2) safe to ground or leave unmasked on PCB?
Pin 2 is internally unconnected and must remain electrically floating. Grounding it risks unintended current paths or solder bridging; leaving it unmasked is acceptable, but best practice is to omit copper and solder mask entirely per Nexperia's recommended footprint in Figure 9 to prevent assembly defects.
BZX84W-C75X 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):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 255 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52.2 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-C75X FAQ
1.How can I place an order for BZX84W-C75X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C75X 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-C75X reliable?
The price and inventory of BZX84W-C75X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C75X is usually 5 days.
3.What payment methods are accepted for BZX84W-C75X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C75X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C75X?
BZX84W-C75X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C75X 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-C75X?
For technical support, including BZX84W-C75X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C75X requirements.
6.How does Aetrix verify that BZX84W-C75X is sourced from the original manufacturer or authorized distributors?
All BZX84W-C75X 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-C75X meets industry standards.
7.What is the process for return or replacement of BZX84W-C75X?
All BZX84W-C75X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C75X, 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-C75X part is unused and in its original packaging.
Return procedure for BZX84W-C75X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C75X Tags
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