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Nexperia USA Inc. BZX384-C51,115
- Part No.:
- BZX384-C51,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-C51,115.pdf
- Description:
- DIODE ZENER 51V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
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Product details
Overview
BZX384-C51,115 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 51 V nominal breakdown voltage at 2 mA test current, 400 Ω maximum differential resistance, and 180 μA reverse current at 38.8 V. It delivers stable reference voltage in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.
For engineers reviewing the BZX384-C51,115 datasheet, BZX384-C51,115 pinout, BZX384-C51,115 application, or BZX384-C51,115 equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (110 K/W to solder point), non-repetitive peak reverse current (0.4 A), and SOD323 footprint compatibility with high-density PCB layouts.
Technical Context
This discrete Zener diode operates in reverse-biased avalanche mode to maintain a stable reference voltage across its terminals. Its 51 V nominal Zener voltage is specified at IZ = 2 mA, with temperature coefficient of +0.05 mV/K and typical reverse leakage <1 μA below 38.8 V.
The device features a low-profile SOD323 surface-mount package with cathode-marked anode-cathode polarity, optimized for reflow and wave soldering per IPC-7095 guidelines. Junction-to-solder-point thermal resistance is 110 K/W, enabling reliable operation up to 150 °C junction temperature under defined PCB mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48.0 V to 54.0 V at IZ = 2 mA - defines usable regulation range under standard test condition |
| Differential Resistance (rdif) | ≤400 Ω - limits output impedance and voltage deviation under load current changes |
| Reverse Current (IR) | ≤180 μA at VR = 38.8 V - ensures low standby power loss in voltage-clamp configurations |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous DC power handling |
| Non-repetitive Peak Reverse Current (IZSM) | 0.4 A for tp = 100 μs - supports transient overvoltage suppression without failure |
| Junction Temperature (Tj) | −65 °C to +150 °C - enables operation in extended industrial ambient environments |
| Thermal Resistance (Rth(j-sp)) | 110 K/W - quantifies heat transfer efficiency from junction to cathode solder point |
Pinout & Package
The BZX384-C51,115 is housed in a SOD323 (SC-76) plastic surface-mount package measuring 1.35 mm × 0.85 mm × 0.55 mm, with cathode identified by a marking bar on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to circuit ground or lower-potential rail; completes bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing where tight regulation is not required |
| 300 mW total power dissipation | Supports continuous operation in space-constrained, low-power analog subsystems |
| SOD323 package footprint | Allows placement in high-density layouts with 0.65 mm pad pitch and minimal board area |
| 150 °C maximum junction temperature | Permits use in thermally demanding industrial enclosures without derating |
| 0.4 A non-repetitive surge current rating | Provides robustness against ESD and line transients in unprotected input stages |
Applications
| Power Supply Feedback | Voltage Reference |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener diode provides precise 51 V reference to drive TL431 or similar shunt regulator. Use Value: Maintains ±5 % output regulation accuracy across temperature and load variations without external trimming. | Use Scenario: Provides stable bias voltage for op-amp comparators in battery monitoring circuits. IC Role / Device Role / Timing Role: Functions as a passive voltage reference source for threshold detection. Use Value: Delivers 51 V reference with <1 μA leakage below knee voltage, minimizing quiescent current draw. |
| Overvoltage Clamp | ESD Protection Stage |
Use Scenario: Placed across sensitive analog inputs to limit transient excursions above 51 V. IC Role / Device Role / Timing Role: Acts as crowbar element that conducts during overvoltage events. Use Value: Clamps spikes within 100 μs with 0.4 A peak current capability, preventing downstream IC damage. | Use Scenario: Integrated into USB or RS-485 interface protection networks. IC Role / Device Role / Timing Role: First-line Zener clamp absorbing fast-rising ESD pulses before TVS activation. Use Value: Handles initial 100 μs surges up to 40 W peak power, reducing stress on secondary protection devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5257BS-7-F | 51 V ±5 %, SOT-323 package, 200 mW Ptot, 600 Ω rdif | Higher dynamic impedance reduces regulation precision under varying load | Select when SOT-323 footprint is preferred and lower power dissipation suffices |
| BZX84-C51,215 | 51 V ±5 %, SOT-23 package, 300 mW Ptot, 400 Ω rdif, Rth(j-a) = 300 K/W | Larger thermal resistance limits sustained power handling on compact PCBs | Choose for legacy SOT-23 designs where board real estate allows higher thermal margin |
Compared with MMBZ5257BS-7-F and BZX84-C51,215, the BZX384-C51,115 offers identical voltage tolerance and differential resistance but superior thermal performance (110 K/W to solder point) and smaller footprint-critical for miniaturized power management modules requiring high reliability under thermal cycling.
Availability
BZX384-C51,115 is available at Aetrix Electronics and suitable for power supply feedback, voltage reference, overvoltage clamp, and ESD protection applications requiring stable component supply, consistent parametric performance, and long-term obsolescence mitigation.
Supply support for BZX384-C51,115 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 logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.
The BZX384 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-power voltage regulation and clamping in consumer, industrial, and communication equipment where small size and parametric consistency are essential.
FAQ
What is the Zener test current for BZX384-C51,115?
The BZX384-C51,115 is characterized at a Zener test current of 2 mA, as specified in Table 9 of the Nexperia datasheet Rev. 4. This current establishes the nominal 51 V breakdown voltage and is used to measure differential resistance (≤400 Ω) and temperature coefficient (+0.05 mV/K). Operation outside this condition alters voltage accuracy and thermal behavior.
Can BZX384-C51,115 be used in automotive applications?
No. The BZX384-C51,115 is explicitly designated as non-automotive qualified per Nexperia's revision history (Rev. 4, January 2023), which states "Products changed to non-automotive qualification." Automotive-grade alternatives require −Q suffix variants and AEC-Q101 qualification, which this part does not possess.
How does the SOD323 package affect thermal performance?
The SOD323 package delivers a junction-to-solder-point thermal resistance of 110 K/W, significantly lower than the 300 K/W junction-to-ambient value. This means heat transfers efficiently from the die to the PCB copper via the cathode pad, enabling higher sustained power dissipation when mounted on thermally enhanced land patterns-critical for reliability in enclosed industrial housings.
What is the maximum reverse voltage before breakdown begins?
The maximum reverse voltage before significant conduction begins is 38.8 V, defined as the voltage at which reverse current reaches 1 μA. Below this threshold, leakage remains <1 μA, ensuring minimal power loss in standby mode. This parameter is confirmed in Table 9 for the BZX384-C51 variant and forms the basis for safe operating voltage margins in clamp designs.
BZX384-C51,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-C51,115 FAQ
1.How can I place an order for BZX384-C51,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-C51,115 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 BZX384-C51,115 reliable?
The price and inventory of BZX384-C51,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-C51,115 is usually 5 days.
3.What payment methods are accepted for BZX384-C51,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-C51,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-C51,115?
BZX384-C51,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-C51,115 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 BZX384-C51,115?
For technical support, including BZX384-C51,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-C51,115 requirements.
6.How does Aetrix verify that BZX384-C51,115 is sourced from the original manufacturer or authorized distributors?
All BZX384-C51,115 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 BZX384-C51,115 meets industry standards.
7.What is the process for return or replacement of BZX384-C51,115?
All BZX384-C51,115 units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-C51,115, 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 BZX384-C51,115 part is unused and in its original packaging.
Return procedure for BZX384-C51,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-C51,115 Tags
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