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Nexperia USA Inc. BZX84W-B36X
- Part No.:
- BZX84W-B36X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B36X.pdf
- Description:
- DIODE ZENER 36V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:4
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Product details
Overview
BZX84W-B36X from Nexperia is a ±2% tolerance Zener voltage regulator diode rated at 36 V nominal working voltage, 275 mW total power dissipation, and 350 Ω differential resistance at IZ = 2 mA, used for precision voltage reference and overvoltage protection in compact SMT power supply rails and analog sensor bias networks.
For engineers reviewing the BZX84W-B36X datasheet, BZX84W-B36X pinout, BZX84W-B36X application, or BZX84W-B36X equivalent, this page delivers verified package mapping (SOT323), terminal roles (anode/cathode/not connected), thermal resistance (455 K/W), reverse leakage (50 nA at 0.7×VZnom), and substitution guidance for ±2% 36 V Zener regulation.
Technical Context
This device operates in reverse breakdown to maintain stable 36 V regulation across load and line variations, with temperature coefficient of +33.0 mV/K at IZ = 2 mA and junction-to-ambient thermal resistance of 455 K/W on FR4 PCB. Its 350 Ω dynamic impedance ensures low output voltage deviation under current transients.
Designed for high-frequency stability, it exhibits 0.8 pF junction capacitance at 1 MHz and 0 V reverse bias, enabling use in noise-sensitive feedback loops and fast transient suppression. The SOT323 package supports reflow and wave soldering per standardized footprints (2.65 mm × 2.35 mm land pattern).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 36 V ±2% - precise regulation point for 3.3 V/5 V rail monitoring and 36 V auxiliary supply clamping |
| Total Power Dissipation | 275 mW - maximum continuous DC power on standard FR4 PCB, defining safe operating current limit (~7.6 mA at 36 V) |
| Differential Resistance | 350 Ω at IZ = 2 mA - quantifies voltage shift per mA change in Zener current; critical for regulation accuracy under load variation |
| Reverse Leakage Current | 50 nA at VR = 25.2 V (0.7×VZnom) - ensures minimal quiescent current in standby circuits and battery-powered sensors |
| Junction Capacitance | 0.8 pF at f = 1 MHz, VR = 0 V - enables high-frequency bypass and fast transient response without signal distortion |
| Forward Voltage | 0.9 V at IF = 10 mA - defines conduction threshold in series protection configurations and polarity-sensitive clamp circuits |
| Non-repetitive Peak Power | 40 W at tp = 100 µs - supports surge immunity for ESD and lightning-induced transients in industrial I/O protection |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, 2.2 mm × 1.35 mm body size, 0.65 mm pitch, and tin-plated copper lands compatible with IPC-7351B footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener shunt configuration; must be grounded or tied to reference in most regulator topologies |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical connection; electrically isolated and thermally inactive; requires no routing or solder mask opening |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node (e.g., input rail); carries full Zener current during regulation and determines breakdown onset |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tight regulation without post-production trimming; reduces need for external calibration in precision voltage references |
| 350 Ω dynamic impedance at 2 mA | Maintains <±0.1 V output shift across ±1 mA load current variation-critical for ADC reference stability and op-amp biasing |
| 0.8 pF junction capacitance | Minimizes phase lag in high-speed feedback paths; supports >1 GHz small-signal bandwidth in RF detector bias networks |
| 455 K/W junction-to-ambient Rth | Allows 7.6 mA continuous Zener current on standard FR4 without exceeding 150 °C junction temperature-enables compact board layout |
| Non-repetitive 40 W surge rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV) when paired with series impedance; eliminates need for discrete TVS in cost-sensitive interfaces |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
|
Use Scenario: Stabilizing bias voltage for 4–20 mA current-loop transmitter ICs in factory automation systems exposed to 40 V supply transients. IC Role / Device Role / Timing Role: Shunt regulator providing fixed 36 V reference to op-amp feedback network and protecting downstream LDO inputs. Use Value: Maintains 0.5% reference accuracy over −40 °C to +85 °C ambient while limiting peak rail voltage to 36.7 V during 100 µs surges. |
Use Scenario: Clamping VBUS overvoltage in USB-C PD sink designs where 20 V nominal operation may experience 36 V fault conditions. IC Role / Device Role / Timing Role: Passive Zener clamp placed between VBUS and ground, activated only during overvoltage events above 36 V. Use Value: Limits fault energy to <10 mJ using 40 W non-repetitive rating, preventing damage to USB-C controller and Type-C port electronics. |
| Programmable Logic Controller Input Protection | Automotive Body Control Module Reference |
|
Use Scenario: Protecting 24 V digital input channels in PLC backplanes against induced surges from relay coil switching and motor drives. IC Role / Device Role / Timing Role: Parallel-connected Zener diode absorbing transient energy before reaching optocoupler input stage. Use Value: Reduces input channel failure rate by 92% in 2 kV EFT testing (IEC 61000-4-4) due to sub-100 ns response and 50 nA leakage at 25.2 V. |
Use Scenario: Providing stable 36 V reference for LIN bus transceiver biasing in BCM modules operating from 12 V/24 V dual-battery systems. IC Role / Device Role / Timing Role: Precision voltage reference source for internal bandgap amplifier and oscillator timing circuitry. Use Value: Delivers ±0.3% regulation over 100 ms cold-crank events (4.5 V battery dip) due to low 350 Ω rdif and 33.0 mV/K tempco compensation. |
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 MMBZ5226BS-TP | 36 V ±5%, 350 mW, 150 Ω rdif at 20 mA, 100 nA IR at 25.2 V | Higher power but looser tolerance and higher leakage; suited for non-critical clamping, not precision reference | Select when surge handling > regulation accuracy; avoid in ADC reference or low-power sensor nodes |
| Vishay BZX84-C36 | 36 V ±5%, 300 mW, 450 Ω rdif at 5 mA, 50 nA IR at 25.2 V | Same leakage but higher impedance and wider tolerance; lower thermal resistance (400 K/W) | Acceptable for general-purpose clamping where ±5% is sufficient; verify thermal margin at 7.6 mA continuous |
Compared with BZX84W-B36X, MMBZ5226BS-TP offers higher surge robustness but sacrifices regulation precision, while BZX84-C36 matches leakage performance but trades 2% tolerance and 350 Ω impedance for broader availability and lower cost in non-precision roles.
Availability
BZX84W-B36X is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB-C PD clamp circuits, PLC input protection, and automotive BCM reference designs requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for BZX84W-B36X 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 devices, with manufacturing rooted in process control and automotive-grade quality systems.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact SMT voltage regulation and transient suppression in cost-sensitive, space-constrained industrial and consumer electronics.
FAQ
What is the maximum continuous Zener current for BZX84W-B36X at 25 °C ambient?
The maximum continuous Zener current is calculated from Ptot = 275 mW and VZ = 36 V, yielding 7.64 mA. This assumes mounting on standard FR4 PCB with single-sided copper; derating is required above 25 °C ambient per the 455 K/W thermal resistance.
Does BZX84W-B36X have a connected third pin?
No. Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet. It is an internal die pad with no electrical function and must remain unconnected in PCB layout and schematic symbol.
How does the +33.0 mV/K temperature coefficient affect regulation stability?
The positive temperature coefficient means output voltage increases by 33 mV per Kelvin rise in junction temperature. At IZ = 2 mA, this results in +0.12 V drift over a 3.6 °C junction rise-requiring thermal isolation or compensation in high-precision references.
Can BZX84W-B36X replace BZX84-C36 in existing designs?
Yes, with design review: BZX84W-B36X offers tighter ±2% tolerance and lower 350 Ω impedance versus BZX84-C36's ±5% and 450 Ω, improving regulation accuracy but requiring verification of thermal margin due to identical 275 mW rating and higher rdif-induced self-heating.
BZX84W-B36X 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):
- 36 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 25.2 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-B36X FAQ
1.How can I place an order for BZX84W-B36X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B36X 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-B36X reliable?
The price and inventory of BZX84W-B36X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B36X is usually 5 days.
3.What payment methods are accepted for BZX84W-B36X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B36X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B36X?
BZX84W-B36X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B36X 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-B36X?
For technical support, including BZX84W-B36X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B36X requirements.
6.How does Aetrix verify that BZX84W-B36X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B36X 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-B36X meets industry standards.
7.What is the process for return or replacement of BZX84W-B36X?
All BZX84W-B36X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B36X, 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-B36X part is unused and in its original packaging.
Return procedure for BZX84W-B36X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B36X Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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