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Nexperia USA Inc. BZX84W-C33X
- Part No.:
- BZX84W-C33X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C33X.pdf
- Description:
- DIODE ZENER 33V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,717
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Product details
Overview
BZX84W-C33X from Nexperia is a ±5 % tolerance Zener diode optimized for voltage regulation and reference functions in space-constrained SMD designs, with a nominal Zener voltage of 33 V, 325 Ω differential resistance at 2 mA, 29.7 mV/K temperature coefficient, and 45 pF junction capacitance at 1 MHz - deployed in power supply feedback loops and analog sensor biasing circuits.
For engineers reviewing the BZX84W-C33X datasheet, BZX84W-C33X pinout, BZX84W-C33X application, or BZX84W-C33X equivalent, this page delivers verified electrical parameters, SOT323 terminal mapping, thermal derating guidance, and direct substitution options for precision low-power voltage stabilization.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its cathode-anode terminals under varying load current (IZ = 2 mA typical), with a non-repetitive peak reverse power dissipation of 40 W for 100 µs pulses and a maximum junction temperature of 150 °C.
Its SOT323 package features a thermally optimized FR4 PCB footprint (single-sided copper, tin-plated) yielding 455 K/W junction-to-ambient thermal resistance, and exhibits low leakage (<50 nA at VR = 0.7 × VZnom) and predictable temperature drift behavior across −55 °C to +150 °C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, ±5 % tolerance (31.0 V to 35.0 V) - defines regulated output voltage under 2 mA test current |
| Differential Resistance (rdif) | 325 Ω max at IZ = 2 mA - determines output impedance and load regulation error sensitivity |
| Temperature Coefficient (SZ) | +29.7 mV/K at IZ = 2 mA - quantifies voltage drift per degree Celsius rise in junction temperature |
| Junction Capacitance (Cd) | 45 pF at f = 1 MHz, VR = 0 V - impacts high-frequency noise filtering and transient response in feedback paths |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - enables use as polarity-sensitive clamp or low-drop rectifier in dual-function circuits |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on standard FR4 - sets maximum continuous DC power handling before thermal shutdown |
| Non-repetitive Peak Reverse Current (IZSM) | 1.0 A at tp = 100 µs - supports surge suppression in transient-limited protection stages |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm body size, 0.65 mm pitch, and 0.25 mm maximum height - designed for reflow soldering with standardized footprint per Figure 9.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in regulation path |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | Reverse-biased terminal; ties to regulated output node and provides Zener breakdown reference |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective selection for non-critical reference applications without trimming circuitry |
| 3-terminal SOT323 package with n.c. pin | Provides mechanical stability and thermal isolation while accommodating automated optical inspection |
| Low 45 pF junction capacitance | Minimizes phase shift in high-frequency feedback networks up to ~100 MHz |
| 40 W non-repetitive peak power rating | Supports transient overvoltage clamping in ESD-protected signal lines and power rails |
| −55 °C to +150 °C operating range | Validates operation in industrial control enclosures and automotive under-hood environments |
Applications
| Power Supply Feedback Regulation | Analog Sensor Biasing |
|---|---|
|
Use Scenario: Stabilizing output voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Zener reference element in optocoupler feedback loop, setting precise secondary-side regulation threshold. Use Value: 33 V breakdown enables direct interface with common TL431-based comparators and maintains <1 % output deviation over line/load variation. |
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) and bridge sensors. IC Role / Device Role / Timing Role: Low-noise voltage reference source for ratiometric measurement circuits requiring minimal self-heating. Use Value: 29.7 mV/K temperature coefficient allows predictable calibration offset compensation in 0–100 °C industrial sensing ranges. |
| Overvoltage Clamp Protection | Low-Power Reference Generator |
|
Use Scenario: Limiting transient spikes on microcontroller I/O lines exposed to inductive switching noise. IC Role / Device Role / Timing Role: Fast-acting shunt protector absorbing energy during 100 µs surges up to 40 W peak. Use Value: 1.0 A IZSM rating combined with 325 Ω rdif ensures clamping voltage stays within ±5 % of 33 V during ESD events. |
Use Scenario: Generating fixed 33 V reference for ADC reference buffers and DAC output scaling networks. IC Role / Device Role / Timing Role: Passive voltage reference replacing active ICs where quiescent current <10 µA is mandatory. Use Value: 50 nA reverse leakage at VR = 0.7 × VZnom minimizes loading error in high-impedance reference divider topologies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B33 | ±2 % tolerance (32.3 V–33.7 V), 200 Ω rdif at 5 mA, +29.7 mV/K SZ | Higher precision required in closed-loop feedback where <1 % output error is mandated | Select when tighter voltage accuracy justifies higher unit cost and increased test time |
| MMBZ5262BS-7-F | 33 V nominal, ±5 %, SOT-323, 300 Ω rdif at 20 mA, 30 pF Cd | Higher test current shifts operating point; lower capacitance benefits RF bypassing | Prefer for high-frequency decoupling where 30 pF improves >100 MHz attenuation vs. 45 pF |
Compared with BZX84W-C33X, BZX84W-B33 offers tighter voltage control at higher test current but reduced thermal margin, while MMBZ5262BS-7-F trades lower capacitance for higher dynamic impedance - making each suitable for distinct trade-offs between precision, speed, and power handling.
Availability
BZX84W-C33X is available at Aetrix Electronics and suitable for power supply feedback regulation, analog sensor biasing, overvoltage clamp protection, and low-power reference generator applications requiring stable component supply across industrial, instrumentation, and embedded control programs.
Supply support for BZX84W-C33X 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 automotive-qualified and industrial-grade components.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, thermally robust voltage regulation in consumer, industrial, and computing power systems.
FAQ
What is the maximum continuous power dissipation for BZX84W-C33X at 70 °C ambient?
At Tamb = 70 °C, derated power is calculated using Rth(j-a) = 455 K/W: Ptot = (Tj_max − Tamb) / Rth(j-a) = (150 − 70) / 455 ≈ 176 mW. This reflects linear thermal derating from 275 mW at 25 °C, validated per IEC 60134 limiting values table.
Can BZX84W-C33X replace BZX84W-C30 in a 30 V reference design?
No - BZX84W-C33X has a nominal 33 V Zener voltage (31.0–35.0 V range), exceeding the 30 V (28.5–32.0 V) range of BZX84W-C30 by up to 3.0 V. Substitution would cause over-regulation and potential downstream overvoltage unless circuit gain or feedback ratio is adjusted.
Is Pin 2 electrically functional or purely mechanical?
Pin 2 is explicitly marked "n.c." (not connected) in Nexperia's pinning diagram and device outline - it has no internal bond wire or silicon connection and serves only as a mechanical anchor for SMT placement stability and coplanarity control.
How does the 45 pF junction capacitance affect high-frequency performance?
At 1 MHz, 45 pF yields an impedance of ~3.5 kΩ, allowing effective AC shunting above ~100 kHz; however, above 10 MHz, capacitive reactance drops below 100 Ω, potentially introducing phase lag in fast-switching feedback loops or degrading EMI filter roll-off slope.
BZX84W-C33X 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):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 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-C33X FAQ
1.How can I place an order for BZX84W-C33X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C33X 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-C33X reliable?
The price and inventory of BZX84W-C33X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C33X is usually 5 days.
3.What payment methods are accepted for BZX84W-C33X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C33X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C33X?
BZX84W-C33X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C33X 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-C33X?
For technical support, including BZX84W-C33X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C33X requirements.
6.How does Aetrix verify that BZX84W-C33X is sourced from the original manufacturer or authorized distributors?
All BZX84W-C33X 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-C33X meets industry standards.
7.What is the process for return or replacement of BZX84W-C33X?
All BZX84W-C33X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C33X, 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-C33X part is unused and in its original packaging.
Return procedure for BZX84W-C33X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C33X 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
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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