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Nexperia USA Inc. BZX84W-B51F
- Part No.:
- BZX84W-B51F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B51F.pdf
- Description:
- DIODE ZENER 51V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5
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Product details
Overview
BZX84W-B51F from Nexperia is a ±2 % tolerance Zener voltage regulator diode with nominal 51 V regulation, 400 Ω differential resistance at 2 mA, and 51.0 mV/K temperature coefficient, designed for precision voltage reference and overvoltage protection in compact SMT power supply rails and sensor bias networks.
For engineers reviewing the BZX84W-B51F datasheet, BZX84W-B51F pinout, BZX84W-B51F application, or BZX84W-B51F equivalent, this device supports stable 51 V clamping in low-power analog circuits, offers tight 2 % voltage tolerance for calibration-critical designs, and delivers 275 mW continuous dissipation in the ultra-small SOT323 package.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 51 V reference across its cathode–anode terminals under regulated current conditions (IZ = 2 mA). Its ±2 % tolerance ensures minimal unit-to-unit variation in voltage-sensitive feedback paths.
The device exhibits a positive temperature coefficient of +51.0 mV/K at IZ = 2 mA, enabling predictable drift compensation in temperature-stable references. Thermal resistance from junction to ambient is 455 K/W on standard FR4 PCB, limiting maximum junction temperature to 150 °C at rated power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener voltage (VZ) | 50.0 V to 52.0 V at IZ = 2 mA - defines precise clamping threshold for overvoltage protection |
| Tolerance | ±2 % - enables high-accuracy voltage reference without post-production trimming |
| Differential resistance (rdif) | 400 Ω max at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Temperature coefficient (SZ) | +51.0 mV/K at IZ = 2 mA - quantifies voltage drift per degree Celsius for thermal design margining |
| Total power dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous operating power in standard layout |
| Forward voltage (VF) | ≤0.9 V at IF = 10 mA - ensures low-loss conduction when used in series forward-biased configurations |
| Reverse leakage (IR) | 50 nA max at VR = 0.7 × VZnom - guarantees minimal standby current in high-impedance bias networks |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint optimized for reflow soldering (2.65 mm × 2.35 mm body, 0.65 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener operation (reverse-biased cathode–anode) |
| 2 | Not connected (n.c.) | Electrically isolated internal pad; no PCB trace or solder connection required |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node to enable Zener breakdown and voltage regulation |
Key Features
| Feature | Design Value |
|---|---|
| Wide voltage range coverage | 51 V nominal within 2.4 V–75 V E24 series - supports single-family sourcing across diverse system rail voltages |
| Tight tolerance option | ±2 % (B-series) - reduces binning requirements and improves yield in precision analog signal chains |
| Low capacitance | 0.4 pF typical at f = 1 MHz, VR = 0 V - minimizes high-frequency loading in RF bias and fast transient detection circuits |
| High surge capability | 40 W non-repetitive peak reverse power at tp = 100 µs - withstands short-duration transients without degradation |
| Thermal robustness | 150 °C maximum junction temperature - enables reliable operation in industrial ambient environments up to +125 °C |
Applications
| Power Supply Voltage Reference | Sensor Bias Network Stabilization |
|---|---|
|
Use Scenario: Providing stable 51 V reference for ADC input scaling and DAC output conditioning in industrial data acquisition modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp reference node voltage against supply ripple and load variation. Use Value: ±2 % tolerance ensures ≤1.02 V absolute error in 51 V reference, directly improving end-system measurement accuracy without calibration. |
Use Scenario: Biasing photodiode or MEMS pressure sensor elements requiring stable reverse-bias voltage in portable environmental monitors. IC Role / Device Role / Timing Role: Precision voltage source establishing fixed reverse-bias potential across high-impedance sensor terminals. Use Value: 50 nA max leakage at 35.7 V ensures sensor bias current error remains below 0.1 % of typical 50 µA sensor dark current. |
| Overvoltage Protection Clamp | Microcontroller I/O Line Protection |
|
Use Scenario: Clamping 48 V DC bus surges in PoE-powered edge gateways to protect downstream DC–DC converter inputs. IC Role / Device Role / Timing Role: Fast-acting shunt protector diverting transient energy above 51 V to ground before IC damage occurs. Use Value: 40 W non-repetitive surge rating absorbs 4 kV/1 A 10/1000 µs transients per IEC 61000-4-5 Level 3 without derating. |
Use Scenario: Protecting 3.3 V microcontroller GPIO pins from accidental 12 V miswiring or ESD events in industrial HMI panels. IC Role / Device Role / Timing Role: Low-capacitance (0.4 pF) Zener placed between I/O line and ground to clamp excursions while preserving signal integrity. Use Value: Sub-1 pF capacitance avoids >100 MHz signal attenuation, maintaining rise/fall times for UART/SPI lines up to 10 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C51 | ±5 % tolerance (51 V ±2.55 V), 425 Ω rdif max at IZ = 2 mA | Higher voltage uncertainty; suitable where cost sensitivity outweighs precision needs | Select for cost-driven consumer electronics where ±5 % regulation suffices and BOM simplification is prioritized |
| MMSZ5257B | ±5 % tolerance, 50 V nominal, SOD-123 package (3.7 mm × 1.6 mm), 500 mW Ptot | Larger footprint, higher power, looser tolerance - trades size for thermal headroom | Choose when board space allows larger package and 500 mW dissipation is needed for sustained 50 V clamping |
Compared with BZX84W-B51F, BZX84W-C51 sacrifices 3 % tolerance and higher dynamic impedance for lower unit cost, while MMSZ5257B trades miniaturization for greater thermal margin and relaxed tolerance - making BZX84W-B51F optimal for space-constrained, precision 51 V reference designs.
Availability
BZX84W-B51F is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and embedded overvoltage protection circuits requiring stable component supply with full traceability and lifecycle continuity.
Supply support for BZX84W-B51F 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, with manufacturing in Europe and Asia.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for compact, high-frequency voltage regulation and clamping in space-constrained SMT applications across industrial and consumer electronics.
FAQ
What is the maximum continuous reverse current the BZX84W-B51F can sustain without exceeding its power rating?
At 25 °C ambient on a standard FR4 PCB, the BZX84W-B51F sustains up to 5.4 mA continuous reverse current (IZ = Ptot / VZ ≈ 275 mW / 51 V) before reaching its 275 mW total power dissipation limit. Derating is required above 25 °C per the 455 K/W thermal resistance specification.
Can the BZX84W-B51F be used in series with other Zeners to achieve higher reference voltages?
Yes - its low 50 nA leakage at 35.7 V and matched temperature coefficient allow cascading with identical units. However, cumulative tolerance (±2 % each) and differential resistance additivity must be accounted for; parallel use is not recommended due to mismatch-induced current hogging.
Is the not-connected (n.c.) pin in the SOT323 package electrically isolated or thermally coupled to the die?
Pin 2 is a fully isolated internal pad with no electrical or thermal connection to the silicon die or leads. It serves only mechanical anchoring and does not require PCB routing or thermal relief - leaving it unconnected has zero impact on electrical performance or thermal behavior.
How does the +51.0 mV/K temperature coefficient affect long-term stability in a 51 V reference circuit?
At 50 °C ambient rise, the BZX84W-B51F's output shifts +2.55 V (50 K × 51.0 mV/K), resulting in ~5.0 % deviation from nominal. For stable references, this requires either active temperature compensation or operation within ≤±5 °C ambient variation to hold error under ±0.25 V.
BZX84W-B51F 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:
- ±2%
- 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-B51F FAQ
1.How can I place an order for BZX84W-B51F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B51F 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-B51F reliable?
The price and inventory of BZX84W-B51F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B51F is usually 5 days.
3.What payment methods are accepted for BZX84W-B51F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B51F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B51F?
BZX84W-B51F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B51F 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-B51F?
For technical support, including BZX84W-B51F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B51F requirements.
6.How does Aetrix verify that BZX84W-B51F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B51F 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-B51F meets industry standards.
7.What is the process for return or replacement of BZX84W-B51F?
All BZX84W-B51F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B51F, 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-B51F part is unused and in its original packaging.
Return procedure for BZX84W-B51F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B51F Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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