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Nexperia USA Inc. BZX84-C51,215
- Part No.:
- BZX84-C51,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C51,215.pdf
- Description:
- DIODE ZENER 51V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,110
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Product details
Overview
BZX84-C51,215 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 51 V nominal breakdown voltage at 2 mA, 400 Ω maximum differential resistance, and 180 μA reverse current at 38.8 V, used for precision low-power voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the BZX84-C51,215 datasheet, BZX84-C51,215 pinout, BZX84-C51,215 application, or BZX84-C51,215 equivalent, this page delivers verified Zener voltage, thermal resistance, peak surge capability, and SOT23 terminal mapping - critical for ESD-sensitive analog rails, embedded LDO supervision, and compact DC-DC feedback networks.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified Zener voltage (VZ = 48.0–54.0 V). Its temperature coefficient of +0.05 mV/K at IZ = 2 mA ensures minimal drift across industrial temperature ranges (−55 °C to +150 °C).
Designed for surface-mount reliability, it features non-repetitive peak reverse power dissipation of 40 W (100 μs pulse), junction-to-ambient thermal resistance of 500 K/W on FR4 PCB, and forward voltage ≤0.9 V at 10 mA - enabling robust transient suppression without heatsinking in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 48.0 V to 54.0 V at IZ = 2 mA - defines regulation threshold with ±5 % tolerance for cost-sensitive reference applications |
| Differential Resistance rdif | 400 Ω max at IZ = 2 mA - determines output impedance and load regulation error under varying current |
| Reverse Current IR | 180 μA max at VR = 38.8 V - quantifies leakage below knee voltage, critical for low-quiescent circuits |
| Total Power Dissipation Ptot | 250 mW at Tamb ≤ 25 °C - sets continuous DC power limit on standard FR4 PCB without forced cooling |
| Non-repetitive Peak Power PZSM | 40 W for 100 μs - enables clamping of short-duration transients like ESD or inductive kickback |
| Junction Temperature Tj | 150 °C max - defines upper thermal operating limit before permanent degradation |
| Thermal Resistance Rth(j-a) | 500 K/W - indicates self-heating rise per watt on standard single-sided FR4 layout |
Pinout & Package
Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with 1.9 mm × 1.1 mm footprint and 0.45 mm profile - optimized for high-density PCB assembly and reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node; reverse-biased during regulation; carries forward current during fault conditions |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical bond - must remain unconnected on PCB to avoid parasitic coupling or thermal path disruption |
| 3 | Cathode (K) | Connected to higher-potential node; primary current return path during Zener conduction; solder point defines Rth(j-sp) = 330 K/W |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener tolerance | Enables cost-effective voltage referencing where tight regulation is secondary to bill-of-materials reduction |
| 250 mW total power rating | Supports continuous regulation in low-current bias networks (<5 mA) without derating on standard PCBs |
| 40 W surge capability | Clamps 100 μs transients up to 400 V × 100 mA without failure - suitable for I/O line protection |
| 150 °C maximum junction temperature | Permits operation in sealed enclosures or near heat-generating components without thermal shutdown |
| SOT23 footprint compatibility | Ensures drop-in replacement for legacy Zeners and interoperability with automated pick-and-place equipment |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp for Microcontroller I/O |
|---|---|
|
Use Scenario: Stabilizing output voltage of isolated flyback converter via optocoupler feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing precise 51 V threshold to control PWM duty cycle. Use Value: Maintains ±1.5 % output regulation across line/load variations due to low rdif and stable VZ temperature coefficient. |
Use Scenario: Protecting 3.3 V GPIO pins from accidental 12 V misconnection or ESD events. IC Role / Device Role / Timing Role: Passive clamp diverting excess voltage to ground before IC damage occurs. Use Value: Limits pin voltage to ≤54 V within 100 ns using 40 W surge rating - preventing latch-up in adjacent logic. |
| Low-Power Sensor Biasing | Industrial Analog Signal Conditioning |
|
Use Scenario: Generating stable 51 V bias for high-voltage photodiode amplifier stages. IC Role / Device Role / Timing Role: Low-noise voltage source replacing active regulators to minimize supply-induced ripple. Use Value: Delivers <180 μA leakage at 38.8 V, reducing dark-current error in precision current-to-voltage conversion. |
Use Scenario: Providing reference voltage for 16-bit ADC input scaling in programmable logic controller (PLC) analog modules. IC Role / Device Role / Timing Role: Fixed-point calibration reference traceable to E24 series with known ±5 % uncertainty. Use Value: Enables factory-trimmed offset correction with predictable VZ drift of +0.05 mV/K over −40 °C to +85 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5257BS | 51 V nominal, ±5 %, 200 mW Ptot, 350 Ω rdif, SOT23 package | Lower power rating reduces thermal margin in sustained overload; tighter rdif improves regulation linearity | Select when lower dynamic impedance is prioritized over surge robustness |
| Vishay BZX84-C51-TP | 51 V nominal, ±5 %, 300 mW Ptot, 450 Ω rdif, same SOT23 footprint | Higher power rating allows longer transient clamping; higher rdif increases load regulation error | Select when extended continuous dissipation is required and leakage <200 μA is acceptable |
Compared with BZX84-C51,215, MMBZ5257BS offers better regulation accuracy but reduced surge handling, while BZX84-C51-TP trades off impedance stability for higher steady-state power - making the Nexperia part optimal for balanced performance in feedback and clamp roles.
Availability
BZX84-C51,215 is available at Aetrix Electronics and suitable for power supply feedback references, microcontroller I/O protection, low-power sensor biasing, and industrial analog signal conditioning requiring stable component supply and full traceability.
Supply support for BZX84-C51,215 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 BZX84 series belongs to Nexperia's precision Zener diode product line, engineered for cost-sensitive yet thermally robust voltage regulation in consumer, industrial, and computing power systems.
FAQ
What is the guaranteed Zener voltage range for BZX84-C51,215 at 2 mA test current?
The guaranteed Zener voltage range is 48.0 V to 54.0 V at IZ = 2 mA, reflecting its ±5 % tolerance grade. This range is validated per IEC 60134 limiting values and confirmed in Table 9 of the Rev. 7 datasheet under "BZX84-C51" row.
Can BZX84-C51,215 be used in place of a 5.1 V Zener diode?
No - BZX84-C51,215 is a 51 V device, not 5.1 V. The "51" in the part number denotes nominal Zener voltage, not decimal placement. Substituting it for a 5.1 V Zener would result in catastrophic overvoltage failure of downstream circuitry.
Is Pin 2 electrically functional or a mechanical dummy lead?
Pin 2 is explicitly marked "n.c." (not connected) in Table 2 of the datasheet and has no internal bond wire or die connection. It serves only as a mechanical alignment aid and must remain unconnected on the PCB to prevent unintended thermal or capacitive coupling.
How does the 40 W non-repetitive peak power rating translate to real-world surge handling?
The 40 W rating applies to a 100 μs square-wave pulse at Tj = 25 °C, corresponding to a peak reverse current of 0.4 A at 51 V. This enables reliable clamping of common transients like relay coil flyback or contact bounce without degradation, provided pulses remain isolated and infrequent.
BZX84-C51,215 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 250 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-C51,215 FAQ
1.How can I place an order for BZX84-C51,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C51,215 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 BZX84-C51,215 reliable?
The price and inventory of BZX84-C51,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C51,215 is usually 5 days.
3.What payment methods are accepted for BZX84-C51,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C51,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C51,215?
BZX84-C51,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C51,215 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 BZX84-C51,215?
For technical support, including BZX84-C51,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C51,215 requirements.
6.How does Aetrix verify that BZX84-C51,215 is sourced from the original manufacturer or authorized distributors?
All BZX84-C51,215 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 BZX84-C51,215 meets industry standards.
7.What is the process for return or replacement of BZX84-C51,215?
All BZX84-C51,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C51,215, 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 BZX84-C51,215 part is unused and in its original packaging.
Return procedure for BZX84-C51,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C51,215 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
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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