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Nexperia USA Inc. BZX84W-C33-QF
- Part No.:
- BZX84W-C33-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C33-QF.pdf
- Description:
- DIODE ZENER 33V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,497
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Product details
Overview
BZX84W-C33-QF from Nexperia is a ±5% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 33 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides precise voltage reference and overvoltage protection in compact DC power rails and sensor biasing circuits.
For engineers reviewing the BZX84W-C33-QF datasheet, BZX84W-C33-QF pinout, BZX84W-C33-QF application, or BZX84W-C33-QF equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (455 K/W), differential resistance (325 Ω at 5 mA), reverse leakage current (50 nA at 23.1 V), and AEC-Q101 qualification status.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal 33 V regulation voltage at IZ = 5 mA, exhibiting a temperature coefficient of +29.7 mV/K and differential resistance of 325 Ω under same conditions. Its non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses.
The device features a three-terminal SOT323 package with anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3); Pin 2 is internally unconnected and must remain floating. Thermal performance is specified for mounting on FR4 PCB with single-sided copper and standard footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal at IZ = 5 mA; ±5% tolerance ensures regulation within 31.0–35.0 V across production lot. |
| Differential Resistance (rdif) | 325 Ω max at IZ = 5 mA; defines voltage change per mA load variation in regulation region. |
| Reverse Leakage Current (IR) | 50 nA max at VR = 0.7 × VZnom = 23.1 V; critical for low-power standby and battery-backed circuits. |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; sets maximum continuous DC power handling before thermal derating. |
| Junction Temperature (Tj) | 150 °C max; enables operation in under-hood automotive environments with ambient up to +125 °C. |
| Thermal Resistance (Rth(j-a)) | 455 K/W; determines junction-to-ambient temperature rise per watt dissipated in standard layout. |
| Capacitance (Cd) | 0.9 pF at f = 1 MHz, VR = 0 V; supports high-frequency noise suppression and fast transient response. |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package: 1.35 mm × 1.75 mm footprint, 0.95 mm height, 3-terminal configuration with exposed pad not present. Mounting requires reflow or wave soldering per Figures 9–10 in datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential side of regulated node; reverse-biased during Zener operation. |
| 2 | Not Connected (n.c.) | Internally unconnected; must be left floating-no routing or soldering required. |
| 3 | Cathode (K) | Connected to higher-potential side (e.g., supply rail); carries reverse current during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTGB, HTRB, and temperature cycling per JESD22-A108. |
| ±5% Zener voltage tolerance | Enables cost-optimized design where tighter regulation is unnecessary, e.g., non-critical biasing or clamping. |
| Low 0.9 V forward voltage | Minimizes conduction loss when used in series forward-path configurations or polarity protection. |
| 40 W non-repetitive surge rating | Withstands ESD transients and load-dump spikes without degradation when properly decoupled. |
| 0.9 pF junction capacitance | Preserves signal integrity in RF-coupled or high-speed feedback paths without introducing phase lag. |
Applications
| Automotive Cabin Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs in HVAC control units exposed to 12 V battery fluctuations. IC Role / Device Role / Timing Role: Zener diode providing stable 33 V reference for precision voltage divider feeding 12-bit SAR ADC. Use Value: Maintains <±0.5% reference accuracy over −40 °C to +125 °C ambient, enabling consistent temperature measurement resolution. |
Use Scenario: Clamping amplifier output in 4–20 mA loop transmitter to prevent overvoltage damage during line fault events. IC Role / Device Role / Timing Role: Shunt regulator absorbing transient energy above 33 V while limiting op-amp output swing. Use Value: Limits clamp voltage to ≤33.5 V with <100 ns response, protecting downstream DAC and isolation barrier components. |
| Telecom Power Sequencing Circuit | Medical Infusion Pump Power Monitor |
Use Scenario: Generating delayed enable signal via RC timing network referenced to 33 V rail in multi-rail telecom board startup sequence. IC Role / Device Role / Timing Role: Stable voltage reference defining threshold for comparator-based power-good detection. Use Value: Ensures ±0.8% timing window consistency across voltage and temperature, preventing false resets during brown-out recovery. |
Use Scenario: Monitoring 24 V DC input to infusion pump controller using resistive divider into MCU GPIO with overvoltage lockout. IC Role / Device Role / Timing Role: Overvoltage protector clamping at 33 V to prevent MCU damage during power supply surges. Use Value: Triggers immediate shutdown at 33.2 V with <5 µs response, meeting IEC 60601-1 creepage/safety margin requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C33-Q | Same electrical specs and AEC-Q101 qualification; differs only in marking code (S8% vs QF) and packaging tape/reel variant. | No functional difference; identical use in all automotive and industrial designs requiring 33 V ±5% regulation. | Select when standard reel packaging (not custom-marked) is preferred for high-volume SMT assembly. |
| MMSZ5261BT1G | 33 V ±5%, but rated for 350 mW Ptot, 500 Ω rdif, and not AEC-Q101 qualified; TO-236AB (SOT-23) package. | Suitable for commercial-grade power supplies but unsuitable for automotive under-hood deployment due to missing stress test validation. | Choose only for cost-sensitive non-automotive applications where higher power margin offsets poorer regulation stability. |
Compared with BZX84W-C33-QF, the BZX84W-C33-Q offers identical performance in a standard reel format, while MMSZ5261BT1G trades AEC-Q101 compliance and tighter rdif for higher Ptot in a larger package-making it viable only outside automotive safety-critical systems.
Availability
BZX84W-C33-QF is available at Aetrix Electronics and suitable for automotive cabin electronics, industrial sensor interfaces, telecom power sequencing, and medical device power monitoring requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84W-C33-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 is part of Nexperia's automotive-qualified Zener diode portfolio, engineered specifically for robust voltage regulation and transient protection in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse current this diode can handle at 33 V?
The BZX84W-C33-QF is not rated for continuous reverse current at its Zener voltage. At VR = 33 V, it operates in breakdown; the maximum continuous power is limited to 275 mW, corresponding to IZ ≈ 8.3 mA (275 mW ÷ 33 V). Exceeding this risks thermal runaway unless heatsinking or derating is applied.
Can Pin 2 be grounded or tied to a signal without affecting performance?
No-Pin 2 is internally not connected and must remain electrically floating. Grounding or routing it introduces parasitic capacitance and potential solder bridging risk. The datasheet explicitly states "n.c." and shows no internal bond wire; any connection violates the validated SOT323 layout and may compromise AEC-Q101 reliability testing outcomes.
How does the +29.7 mV/K temperature coefficient impact regulation accuracy over temperature?
The positive temperature coefficient means VZ increases by ~29.7 mV per °C rise in junction temperature. Over a −40 °C to +125 °C ambient range (with self-heating), VZ shifts ~4.9 V-so a 33 V nominal device may regulate between ~31.5 V and ~36.4 V. This is factored into the ±5% tolerance band and confirmed in Table 9 test data.
Is this diode suitable for ESD protection in USB 2.0 data lines?
No-BZX84W-C33-QF is optimized for DC voltage regulation, not fast transient suppression. Its 0.9 pF capacitance is too low for effective high-speed line filtering, and its 40 W surge rating applies only to 100 µs pulses, not the 15 kV/150 pF HBM ESD waveform. Dedicated TVS diodes like PESD5V0S1BA are required for USB 2.0 ESD compliance.
BZX84W-C33-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):
- 33 V
- Tolerance:
- ±6.06%
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-C33-QF FAQ
1.How can I place an order for BZX84W-C33-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C33-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-C33-QF reliable?
The price and inventory of BZX84W-C33-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-C33-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-C33-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C33-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C33-QF?
BZX84W-C33-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C33-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-C33-QF?
For technical support, including BZX84W-C33-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C33-QF requirements.
6.How does Aetrix verify that BZX84W-C33-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-C33-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-C33-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-C33-QF?
All BZX84W-C33-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C33-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-C33-QF part is unused and in its original packaging.
Return procedure for BZX84W-C33-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C33-QF Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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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
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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