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Nexperia USA Inc. BZX84W-C51F
- Part No.:
- BZX84W-C51F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C51F.pdf
- Description:
- DIODE ZENER 51V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
BZX84W-C51F from Nexperia is a ±5 % tolerance Zener voltage regulator diode with nominal 51 V regulation, 400 Ω differential resistance at 2 mA, and 51.0 mV/K temperature coefficient, housed in SOT323 (SC-70) package for precision voltage reference in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the BZX84W-C51F datasheet, BZX84W-C51F pinout, BZX84W-C51F application, or BZX84W-C51F equivalent, this page delivers verified Zener parameters, validated SOT323 terminal mapping, confirmed thermal resistance (455 K/W), and real-world use cases in DC-DC converter sensing and ESD clamp networks.
Technical Context
This Zener operates in reverse breakdown mode with specified 51 V nominal working voltage at IZ = 2 mA, exhibiting a positive temperature coefficient of +51.0 mV/K - indicating increasing Zener voltage with junction temperature rise. Its non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses.
The device features low 0.9 V forward voltage at 10 mA, 275 mW total power dissipation on FR4 PCB, and 150 °C maximum junction temperature. Reverse leakage current is limited to 50 nA at 35.7 V (0.7 × VZnom) per specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal at IZ = 2 mA; ±5 % tolerance band (48.0–54.0 V) defines regulation window for stable reference design. |
| Differential Resistance (rdif) | 400 Ω max at IZ = 2 mA; determines output impedance and load regulation sensitivity in shunt regulator topologies. |
| Temperature Coefficient (SZ) | +51.0 mV/K at IZ = 2 mA; quantifies voltage drift per degree Celsius, critical for temperature-stable reference circuits. |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; sets maximum continuous power handling under standard mounting conditions. |
| Thermal Resistance (Rth(j-a)) | 455 K/W in free air on FR4; defines junction-to-ambient thermal path efficiency for thermal derating calculations. |
| Reverse Leakage (IR) | 50 nA max at VR = 35.7 V (0.7 × VZnom); ensures minimal quiescent current in high-impedance bias networks. |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; confirms low-loss conduction when used in series or dual-diode configurations. |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint, 0.65 mm pitch, and 0.1 mm A1 height suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node in reverse-biased Zener operation; forms cathode-anode voltage drop defining regulation point. |
| 2 | Not Connected (n.c.) | Internally unconnected terminal; must remain floating - no PCB trace or solder mask should tie it to any net. |
| 3 | Cathode (K) | Connected to higher-potential node; reverse current flows from K to A during Zener breakdown, establishing regulated voltage across K–A. |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-optimized selection where tight regulation is not required, reducing BOM cost versus ±2 % (B-series) variants. |
| 455 K/W junction-to-ambient thermal resistance | Supports predictable thermal derating up to 125 °C ambient without heatsinking in space-constrained applications. |
| Low 50 nA reverse leakage at 0.7×VZ | Minimizes standby current in battery-powered voltage monitor circuits, extending operational life in always-on systems. |
| Non-repetitive 40 W surge capability | Provides transient overvoltage clamping headroom for ESD and lightning-induced spikes in industrial I/O protection. |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
|
Use Scenario: Shunt regulator in isolated flyback converter feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Zener diode provides precise 51 V reference to set secondary-side output voltage threshold before optocoupler activation. Use Value: 400 Ω rdif ensures <1 % output variation across 1–5 mA load current range, maintaining ±1.5 % overall output regulation. |
Use Scenario: Parallel-connected protection element across 48 V DC bus in industrial PLC backplane. IC Role / Device Role / Timing Role: Acts as crowbar element that conducts above 54 V to trigger downstream shutdown circuitry during overvoltage events. Use Value: 40 W non-repetitive pulse rating absorbs 100 µs transients up to 400 V without failure, meeting IEC 61000-4-5 Level 3 immunity. |
| Temperature-Stable Reference Source | ESD-Sensitive Signal Line Clamp |
|
Use Scenario: Precision voltage reference for analog-to-digital converter (ADC) biasing in automotive cabin sensor module. IC Role / Device Role / Timing Role: Provides stable 51 V reference to generate scaled-down 2.5 V internal reference via resistor divider with temperature compensation. Use Value: +51.0 mV/K SZ allows predictable linear correction in firmware, enabling <±0.02 %/°C effective TC after calibration. |
Use Scenario: Low-capacitance clamp on RS-485 data line exposed to human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Limits line voltage to ≤54 V during ±8 kV contact discharge, preventing damage to transceiver input stage. Use Value: 0.4 pF diode capacitance (at 1 MHz, 0 V) avoids signal integrity degradation at 10 Mbps data rates while clamping within 1 ns. |
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 | ±2 % tolerance (49.98–52.02 V), 300 Ω rdif, +51.0 mV/K SZ | Narrower regulation band improves accuracy in metrology-grade references but increases cost by ~12 %. | Select when output stability better than ±1.5 % over temperature is required; verify thermal derating margin due to tighter tolerance-induced current spread. |
| MMBZ5255BS | ±5 % tolerance (48.45–53.55 V), 500 Ω rdif, +52 mV/K SZ, same SOT323 package | Higher rdif degrades load regulation; 255 °C max Tj enables extended high-temp operation. | Prefer for >125 °C ambient environments; avoid in precision feedback where 100 Ω higher rdif causes >0.5 % additional output error. |
Compared with BZX84W-C51F, BZX84W-B51 offers tighter voltage control at higher cost and slightly lower dynamic impedance, while MMBZ5255BS trades regulation precision for extended thermal capability and higher impedance - making BZX84W-C51F optimal for cost-sensitive, thermally moderate 48–54 V system protection and reference roles.
Availability
BZX84W-C51F is available at Aetrix Electronics and suitable for industrial power supplies, telecom DC-DC converters, and embedded sensor reference circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84W-C51F 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 series belongs to Nexperia's general-purpose Zener diode product line, engineered for robust voltage regulation in space-constrained SMT applications where reliability, consistency, and wide voltage coverage (2.4–75 V) are critical.
FAQ
What is the maximum continuous reverse current for BZX84W-C51F at 25 °C ambient?
The device supports up to 200 mA forward current, but for Zener operation, maximum continuous reverse current is derived from Ptot = 275 mW and VZ = 51 V, yielding ≈5.4 mA. Exceeding this without thermal derating risks junction overheating beyond 150 °C.
Can BZX84W-C51F be used in place of a 5.1 V Zener diode?
No - BZX84W-C51F is a 51 V Zener, not 5.1 V. The "C51" suffix denotes ±5 % tolerance and 51 V nominal voltage; confusion may arise from misreading the marking code "U5%", which corresponds to BZX84W-C51 per Table 4, not 5.1 V.
Is pin 2 truly unconnected, or does it serve a mechanical function?
Pin 2 is electrically unconnected (n.c.) per Table 2 and Figure 8 package outline. It serves only as a mechanical land for board alignment and solder joint reinforcement - no electrical routing or grounding is permitted, as internal die bonding excludes this terminal.
How does the +51.0 mV/K temperature coefficient impact long-term voltage stability?
A +51.0 mV/K coefficient means VZ increases by 51 mV per °C rise in junction temperature. Over a 100 °C rise (25 °C to 125 °C), voltage shifts +5.1 V - a 10 % change - necessitating thermal design to limit ΔT or firmware compensation in precision applications.
BZX84W-C51F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-C51F FAQ
1.How can I place an order for BZX84W-C51F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C51F 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-C51F reliable?
The price and inventory of BZX84W-C51F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C51F is usually 5 days.
3.What payment methods are accepted for BZX84W-C51F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C51F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C51F?
BZX84W-C51F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C51F 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-C51F?
For technical support, including BZX84W-C51F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C51F requirements.
6.How does Aetrix verify that BZX84W-C51F is sourced from the original manufacturer or authorized distributors?
All BZX84W-C51F 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-C51F meets industry standards.
7.What is the process for return or replacement of BZX84W-C51F?
All BZX84W-C51F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C51F, 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-C51F part is unused and in its original packaging.
Return procedure for BZX84W-C51F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C51F Tags
-
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
-
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
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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