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Nexperia USA Inc. BZX84W-C68-QX
- Part No.:
- BZX84W-C68-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C68-QX.pdf
- Description:
- DIODE ZENER 68V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,780
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Product details
Overview
BZX84W-C68-QX from Nexperia is a ±5% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 68 V nominal Zener voltage at IZ = 2 mA, with 475 Ω typical differential resistance, 71.7 mV/K temperature coefficient, and 240 A non-repetitive peak reverse current - used for precision voltage reference and overvoltage clamping in automotive power supply rails.
For engineers reviewing the BZX84W-C68-QX datasheet, BZX84W-C68-QX pinout, BZX84W-C68-QX application, or BZX84W-C68-QX equivalent, key selection criteria include Zener voltage tolerance, thermal coefficient stability across temperature, junction-to-ambient thermal resistance, surge current capability, and AEC-Q101 qualification status for under-hood electronics.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse-biased breakdown at 68 V with low dynamic impedance (475 Ω at IZ = 2 mA) to minimize output voltage variation under load transients. Its positive temperature coefficient of +71.7 mV/K ensures predictable drift behavior above 50 °C ambient.
Designed for surface-mount reflow assembly on FR4 PCBs, it delivers 275 mW total power dissipation and withstands 40 W non-repetitive surge pulses (tp = 100 µs), supporting transient suppression in 12 V/24 V automotive systems where thermal derating and pulse robustness are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V nominal at IZ = 2 mA; ±5% tolerance band (64.0–72.0 V) defines regulation window for feedback loop design. |
| Differential Resistance (rdif) | 475 Ω typical at IZ = 2 mA; determines output impedance and load regulation error in shunt reference circuits. |
| Temperature Coefficient (SZ) | +71.7 mV/K at IZ = 2 mA; enables predictable high-temperature drift compensation in engine control modules. |
| Non-repetitive Peak Reverse Current (IZSM) | 240 A at tp = 100 µs; supports ESD and load-dump transient suppression without failure in automotive ECUs. |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on standard FR4; sets maximum continuous bias current (≈4 mA) for thermal-safe operation. |
| Junction-to-Ambient Thermal Resistance (Rth(j-a)) | 455 K/W; defines temperature rise per watt - critical for derating above 75 °C ambient in enclosed modules. |
| Reverse Leakage Current (IR) | 50 nA at VR = 47.6 V (0.7 × VZnom); ensures minimal quiescent current in always-on battery monitoring circuits. |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; 1.35 mm × 1.75 mm footprint, 0.95 mm height, and tin-plated terminations compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in shunt regulation configuration. |
| 2 | Not Connected (n.c.) | Internally isolated; no electrical function - must remain unconnected on PCB layout. |
| 3 | Cathode (K) | Reverse-biased terminal; connects to regulated voltage rail and current-limiting resistor in Zener reference circuits. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Qualified for automotive applications including engine control, body electronics, and ADAS sensors per stress test requirements. |
| ±5% Zener voltage tolerance | Enables cost-effective voltage reference design where tighter tolerance is not required, reducing BOM cost vs. ±2% variants. |
| Low capacitance (0.25 pF) | Minimizes signal distortion in high-frequency clamping applications such as CAN bus protection and RF front-end biasing. |
| High surge current rating | Withstands 240 A transient pulses (100 µs), meeting ISO 7637-2 Pulse 5a load-dump immunity requirements for 24 V systems. |
| Thermal stability up to 150 °C | Rated junction temperature of 150 °C supports operation in under-hood environments without derating below 125 °C ambient. |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial PLC Analog Input Protection |
|---|---|
|
Use Scenario: Providing stable 68 V reference for microcontroller ADC calibration and sensor excitation in diesel ECU power management. IC Role / Device Role / Timing Role: Shunt voltage reference connected between 72 V auxiliary rail and ground, with series 10 kΩ current-limiting resistor. Use Value: Maintains <±1.5% reference accuracy across −40 °C to +125 °C due to predictable +71.7 mV/K drift and AEC-Q101 reliability. |
Use Scenario: Clamping transient overvoltage on 4–20 mA current-loop analog inputs exposed to field wiring surges in factory automation. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed across input terminals, operating in reverse breakdown during >70 V spikes. Use Value: Limits voltage to ≤72 V with 240 A surge handling, preventing damage to precision op-amps and isolators without adding response delay. |
| Telecom DC-DC Converter Feedback | Medical Infusion Pump Power Monitoring |
|
Use Scenario: Regulating secondary-side feedback voltage in isolated 48 V telecom DC-DC converters requiring precise 68 V threshold detection. IC Role / Device Role / Timing Role: Zener element in optocoupler feedback network, setting upper limit for error amplifier reference. Use Value: 475 Ω rdif ensures <0.5% output voltage deviation under 10 mA load variation, improving converter line/load regulation. |
Use Scenario: Monitoring 60 V backup battery voltage in portable infusion pumps to trigger low-power mode before shutdown. IC Role / Device Role / Timing Role: Precision voltage sense node referenced to ground, interfaced with 12-bit SAR ADC via resistive divider. Use Value: 50 nA leakage at 47.6 V guarantees <1 µA current draw from battery, extending operational life by >8 hours in standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B68-Q | ±2% tolerance (66.6–69.4 V), lower rdif (450 Ω), same package and surge rating | Required where tighter regulation (<±0.5%) is needed for closed-loop feedback stability | Select when reference accuracy outweighs cost sensitivity; requires identical layout and thermal design |
| MMSZ5263ET1G | 68 V nominal, ±5%, SOD-123 package, 500 mW Ptot, higher Rth(j-a) (625 K/W) | Preferred for industrial designs needing higher continuous power but less stringent automotive qualification | Choose if board space allows larger footprint and AEC-Q101 is not mandated; verify thermal margin at 70 °C ambient |
Compared with BZX84W-C68-QX, the BZX84W-B68-Q offers tighter voltage control at the expense of higher unit cost, while MMSZ5263ET1G trades automotive qualification and compact size for greater steady-state power handling in non-automotive settings.
Availability
BZX84W-C68-QX is available at Aetrix Electronics and suitable for automotive ECU design, industrial analog input protection, telecom DC-DC feedback networks, and medical battery monitoring requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84W-C68-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.
BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for robust voltage regulation and transient suppression in harsh automotive environments.
FAQ
What is the maximum continuous forward current for BZX84W-C68-QX?
The device is not rated for continuous forward conduction; its absolute maximum forward current is 200 mA per limiting values table, but forward operation is not intended in normal use. It functions exclusively in reverse-biased Zener breakdown mode for regulation and clamping.
Can BZX84W-C68-QX be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficients below ~5 V and positive above, but even within the same batch, slight VZ mismatches cause current hogging. Parallel connection is not recommended; use a single higher-rated device or external current-sharing resistors if required.
Is the n.c. pin (pin 2) electrically isolated or internally tied to substrate?
Pin 2 is fully unconnected - no internal bond wire or metallization links it to die or package substrate. It must remain floating on PCB; soldering or routing to any net may compromise mechanical integrity or cause unintended coupling.
How does the 71.7 mV/K temperature coefficient affect regulation accuracy at 105 °C?
At 105 °C ambient (ΔT = +80 K from 25 °C), the Zener voltage increases by ≈5.7 V (71.7 mV/K × 80 K), shifting nominal 68 V to ~73.7 V. This is within the ±5% tolerance band and aligns with specified drift behavior for automotive under-hood use.
BZX84W-C68-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):
- 68 V
- Tolerance:
- ±5.88%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 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-C68-QX FAQ
1.How can I place an order for BZX84W-C68-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C68-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-C68-QX reliable?
The price and inventory of BZX84W-C68-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-C68-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-C68-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C68-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C68-QX?
BZX84W-C68-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C68-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-C68-QX?
For technical support, including BZX84W-C68-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C68-QX requirements.
6.How does Aetrix verify that BZX84W-C68-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-C68-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-C68-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-C68-QX?
All BZX84W-C68-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C68-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-C68-QX part is unused and in its original packaging.
Return procedure for BZX84W-C68-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C68-QX 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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SMAZ12-13-F
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