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Nexperia USA Inc. BZX84W-C51-QX
- Part No.:
- BZX84W-C51-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C51-QX.pdf
- Description:
- DIODE ZENER 51V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,795
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Product details
Overview
BZX84W-C51-QX from Nexperia is a ±5% tolerance Zener diode with 51 V nominal regulation voltage, 400 Ω typical differential resistance at IZ = 2 mA, and AEC-Q101 qualification for automotive use. It operates in SOT323 (SC-70) package, delivers 275 mW total power dissipation on FR4 PCB, and supports voltage reference and overvoltage protection in engine control units.
For engineers reviewing the BZX84W-C51-QX datasheet, BZX84W-C51-QX pinout, BZX84W-C51-QX application, or BZX84W-C51-QX equivalent, this page provides verified Zener voltage, thermal resistance, reverse leakage, temperature coefficient, and automotive qualification status - all confirmed from Nexperia's official Rev. 1 product data sheet dated 19 November 2021.
Technical Context
This Zener diode regulates voltage via reverse-biased avalanche breakdown at 51 V (±5%), with a temperature coefficient of +51.0 mV/K at IZ = 2 mA. Its differential resistance remains stable at ≤400 Ω under specified test conditions, enabling precise reference stability in feedback loops.
Designed for high-reliability automotive environments, it meets AEC-Q101 stress testing requirements and sustains non-repetitive peak reverse power up to 40 W (100 µs pulse). Junction-to-ambient thermal resistance is 455 K/W on standard FR4 PCB, limiting steady-state power handling to 275 mW at Tamb = 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener voltage VZ | 48.0 V to 54.0 V (±5% tolerance at IZ = 2 mA); ensures stable reference within automotive supply rail tolerances |
| Differential resistance rdif | ≤400 Ω (max at IZ = 2 mA); maintains low output impedance for tight regulation under load variation |
| Reverse current IR | 50 nA max at VR = 0.7 × VZnom; minimizes standby power loss in always-on circuits |
| Temperature coefficient SZ | +51.0 mV/K (typical at IZ = 2 mA); enables predictable drift compensation in temperature-critical designs |
| Total power dissipation Ptot | 275 mW (on FR4, single-sided copper); defines maximum continuous DC or low-duty-cycle pulsed operation |
| Junction temperature Tj | −55 °C to +150 °C operating range; supports under-hood deployment in engine management systems |
| Package | SOT323 (SC-70); 1.3 mm × 2.2 mm footprint with 0.65 mm pitch - compatible with high-density automotive PCB layouts |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; dimensions: 2.2 mm × 1.35 mm × 0.95 mm (L × W × H), 0.65 mm lead pitch, 0.1 mm max A1 height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward conduction terminal; connects to lower-potential node in reverse-bias regulation configuration |
| 2 | Not connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or solder mask relief required |
| 3 | Cathode (K) | Zener breakdown terminal; connects to regulated voltage node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| ±5% Zener voltage tolerance | Enables cost-effective regulation where tighter tolerance is unnecessary, e.g., overvoltage clamping |
| Low reverse leakage (50 nA) | Reduces quiescent current in battery-backed systems and improves accuracy of high-impedance sensing nodes |
| 455 K/W thermal resistance | Defines derating curve: full 275 mW only at Tamb ≤ 25 °C; requires thermal layout planning above that |
| Non-repetitive surge capability | Withstands 40 W transient pulses (100 µs), supporting ESD and load-dump protection in 12 V/24 V systems |
Applications
| Engine Control Unit (ECU) Reference | Infotainment Power Sequencing |
|---|---|
Use Scenario: Providing stable 51 V reference for analog-to-digital converter biasing in fuel injection timing circuitry. IC Role / Device Role / Timing Role: Voltage reference diode supplying precision bias to op-amp input stage in closed-loop current sensing. Use Value: ±5% tolerance and +51.0 mV/K TC allow predictable offset correction across −40 °C to +125 °C ambient range. |
Use Scenario: Clamping 52 V rail during cold-crank transients in head unit power management. IC Role / Device Role / Timing Role: Overvoltage protection device shunting excess energy to ground when input exceeds 51 V. Use Value: 40 W non-repetitive surge rating absorbs ISO 7637-2 Pulse 1/2b spikes without degradation. |
| ADAS Camera Module Bias | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: Generating clean 51 V bias for CCD image sensor analog front-end in surround-view camera. IC Role / Device Role / Timing Role: Low-noise Zener reference stabilizing high-gain amplifier supply in low-light imaging path. Use Value: 50 nA reverse leakage prevents signal corruption in microamp-level pixel readout currents. |
Use Scenario: Regulating auxiliary 51 V supply for torque sensor bridge excitation in EPS motor control board. IC Role / Device Role / Timing Role: Precision voltage regulator maintaining constant bridge excitation voltage despite battery fluctuations. Use Value: 400 Ω differential resistance ensures <10 mV output shift under 1 mA load variation - critical for <0.1% torque accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B51-Q | ±2% tolerance (49.98–52.02 V), lower rdif (≤350 Ω), same package and AEC-Q101 rating | Required where tighter regulation is needed for ADC reference or precision feedback | Select when system-level calibration budget allows tighter voltage tolerance and lower dynamic impedance |
| MMSZ5257ET1G | ±5% tolerance (48.45–53.55 V), 500 mW Ptot, SOD-123 package, AEC-Q101 qualified | Higher power handling but larger footprint; suitable for non-space-constrained automotive modules | Choose when thermal margin >275 mW is required and PCB area permits 2.9 mm × 1.8 mm SOD-123 |
Compared with BZX84W-C51-QX, the BZX84W-B51-Q offers tighter regulation at identical form factor, while MMSZ5257ET1G trades miniaturization for higher power and different thermal profile - both require revalidation of layout and derating curves.
Availability
BZX84W-C51-QX is available at Aetrix Electronics and suitable for automotive engine control, infotainment power sequencing, and ADAS camera biasing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84W-C51-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage regulation, reference, and overvoltage protection in harsh automotive environments.
FAQ
What is the maximum continuous reverse current for BZX84W-C51-QX at 25 °C?
The maximum continuous reverse current is not directly specified, but derived from Ptot = 275 mW and VZ = 51 V: IZmax ≈ 5.4 mA. This assumes ideal thermal conditions; actual usable current must be derated per ambient temperature using Rth(j-a) = 455 K/W.
Does BZX84W-C51-QX have a cathode stripe marking?
No - the BZX84W-C51-QX uses alphanumeric marking "U5%" on the top surface per Table 4, with no cathode stripe. Pin 3 (cathode) is identified by position in the SOT323 outline (Figure 8), not visual polarity marking.
Can BZX84W-C51-QX replace BZX84-C51 in existing designs?
Yes, with verification: both share 51 V Zener voltage and SOT23/SOT323 compatibility, but BZX84W-C51-QX has AEC-Q101 qualification, tighter thermal specs (Rth(j-a) = 455 K/W vs ~600 K/W), and updated marking. Layout and thermal validation are recommended.
What is the reverse recovery time of BZX84W-C51-QX?
Reverse recovery time is not characterized or specified for this Zener diode. It is designed for DC/low-frequency regulation and clamping, not switching applications; use dedicated TVS or fast-recovery diodes for >1 MHz transient suppression.
BZX84W-C51-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):
- 51 V
- Tolerance:
- ±5.88%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 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-C51-QX FAQ
1.How can I place an order for BZX84W-C51-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C51-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-C51-QX reliable?
The price and inventory of BZX84W-C51-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-C51-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-C51-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C51-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C51-QX?
BZX84W-C51-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C51-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-C51-QX?
For technical support, including BZX84W-C51-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C51-QX requirements.
6.How does Aetrix verify that BZX84W-C51-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-C51-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-C51-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-C51-QX?
All BZX84W-C51-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C51-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-C51-QX part is unused and in its original packaging.
Return procedure for BZX84W-C51-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C51-QX 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
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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