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Nexperia USA Inc. BZX84W-B30X
- Part No.:
- BZX84W-B30X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B30X.pdf
- Description:
- DIODE ZENER 30V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,055
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Product details
Overview
BZX84W-B30X from Nexperia is a ±2 % tolerance Zener voltage regulator diode with nominal 30 V breakdown voltage, 300 Ω typical differential resistance at 2 mA, and 26.6 mV/K temperature coefficient, housed in an SOT323 (SC-70) package for precision low-power voltage reference and clamping in space-constrained analog circuits.
For engineers reviewing the BZX84W-B30X datasheet, BZX84W-B30X pinout, BZX84W-B30X application, or BZX84W-B30X equivalent, this page delivers verified Zener parameters, terminal mapping, thermal limits, and direct-fit alternatives for stable 30 V regulation in industrial sensor interfaces, power supply feedback paths, and overvoltage protection circuits.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 30 V reference across load variations, with a 26.6 mV/K temperature coefficient enabling predictable drift compensation in ambient ranges from −55 °C to +150 °C.
Its 300 Ω differential resistance at IZ = 2 mA ensures tight regulation under small-signal current changes, while the 275 mW total power dissipation rating-measured on FR4 PCB with single-sided copper-defines safe DC and pulsed operating boundaries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.4 V to 30.6 V at IZ = 2 mA - defines precise regulation window for 30 V reference design |
| Differential Resistance (rdif) | 300 Ω max at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient (SZ) | 26.6 mV/K - quantifies voltage drift per degree Celsius for thermal stability analysis |
| Reverse Current (IR) | 50 nA max at VR = 21 V - specifies leakage level below breakdown, critical for low-power standby |
| Total Power Dissipation (Ptot) | 275 mW - maximum continuous DC power on standard FR4 PCB, defining thermal derating envelope |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - sets forward conduction threshold for bidirectional clamp use cases |
| Junction Temperature (Tj) | 150 °C max - absolute limit for silicon reliability; requires thermal resistance management |
Pinout & Package
SOT323 (SC-70) surface-mount plastic package with 3 terminals, leadless construction, and standard reflow footprint (2.65 mm × 2.35 mm body, 0.65 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node in reverse-bias configuration; carries forward current when used as rectifier |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical connection; must remain unconnected in PCB layout |
| 3 | Cathode (K) | Connects to higher-potential node in reverse-bias; source of regulated Zener current in shunt regulator topology |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables high-accuracy voltage references without post-production trimming in 30 V systems |
| 275 mW power rating on FR4 | Supports reliable operation in compact consumer and industrial PCBs without heatsinking |
| 300 Ω differential resistance | Minimizes output voltage variation under ±0.1 mA load current shifts in feedback networks |
| 150 °C maximum junction temperature | Allows deployment in under-hood or enclosed industrial enclosures with limited airflow |
| SOT323 ultra-small footprint | Reduces board area by >50 % vs. SOT23, enabling dense mixed-signal layout in wearables and IoT nodes |
Applications
| Industrial Sensor Signal Conditioning | Switching Power Supply Feedback |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 24 V industrial pressure transducers operating in −40 °C to +85 °C environments. IC Role / Device Role / Timing Role: Shunt Zener regulator providing fixed 30 V bias to op-amp input stage and ADC reference divider. Use Value: 26.6 mV/K temperature coefficient enables predictable offset correction; ±2 % tolerance eliminates calibration steps during production test. |
Use Scenario: Setting output voltage in isolated flyback converter with optocoupler feedback loop. IC Role / Device Role / Timing Role: Precision Zener element in secondary-side TL431 replacement circuit, defining 30 V regulation threshold. Use Value: 300 Ω rdif ensures minimal loop gain variation across line/load transients; 275 mW rating supports continuous duty-cycle operation. |
| Overvoltage Protection Clamp | Low-Power Microcontroller Reset Circuit |
|
Use Scenario: Protecting 3.3 V I/O pins against ESD and surge events up to ±15 kV in handheld medical devices. IC Role / Device Role / Timing Role: Bidirectional clamp using forward conduction (VF ≤ 0.9 V) and reverse Zener action (30 V) to limit transient excursions. Use Value: Low 50 nA leakage at 21 V prevents battery drain in always-on modes; SOT323 size fits within 1.2 mm board edge keep-out zones. |
Use Scenario: Generating clean reset signal for ARM Cortex-M0+ MCU during brown-out conditions in battery-powered asset trackers. IC Role / Device Role / Timing Role: Zener-based voltage monitor triggering external reset IC when supply drops below 2.7 V threshold. Use Value: Tight 29.4–30.6 V range allows accurate resistor-divider scaling to 2.7 V; 150 °C Tj rating ensures reliability during solder reflow and field thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C30 | ±5 % tolerance (28.5–32.0 V), 300 Ω rdif, same SOT323 package | Acceptable where 30 V accuracy < ±5 % suffices; lower cost for non-critical biasing | Select for cost-sensitive designs where 1.2 V regulation window is acceptable |
| MMSZ4686T1G | ±5 % tolerance (28.5–31.5 V), 200 Ω rdif, SOD-123 package (larger footprint) | Higher power handling (500 mW), but 3.7 mm × 1.6 mm body increases board area | Choose when thermal margin >275 mW is required and PCB real estate permits larger package |
Compared with BZX84W-B30X, BZX84W-C30 trades tighter voltage control for lower unit cost, while MMSZ4686T1G offers improved thermal performance at the expense of footprint size-making BZX84W-B30X optimal for space-constrained, high-accuracy 30 V reference designs.
Availability
BZX84W-B30X is available at Aetrix Electronics and suitable for industrial sensor interfaces, switching power supply feedback loops, overvoltage protection clamps, and low-power microcontroller reset circuits requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX84W-B30X 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 BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for precision voltage regulation and clamping in compact, thermally constrained applications across consumer, industrial, and computing markets.
FAQ
What is the maximum reverse current specification for BZX84W-B30X at 21 V?
The maximum reverse current (IR) is 50 nA at VR = 21 V, measured at Tj = 25 °C. This ultra-low leakage ensures minimal power loss in battery-powered systems and preserves accuracy in high-impedance reference dividers where current draw must stay below 100 nA.
Can BZX84W-B30X be used in place of a 30 V Zener with ±5 % tolerance?
Yes, but only where tighter regulation is beneficial. BZX84W-B30X provides ±2 % tolerance (29.4–30.6 V) versus ±5 % (28.5–31.5 V) for C-series variants. Its lower differential resistance (300 Ω vs. same value) and matched temperature coefficient improve stability, making it suitable for upgraded reference designs without layout change.
What is the thermal resistance from junction to ambient for BZX84W-B30X on FR4 PCB?
Rth(j-a) is 455 K/W when mounted on a standard FR4 PCB with single-sided copper, tin-plated, and the recommended footprint. At 275 mW dissipation, this yields a 125 K temperature rise above ambient-requiring derating to 150 mW at 70 °C ambient to maintain Tj ≤ 150 °C.
Is Pin 2 electrically functional in the SOT323 package?
No. Pin 2 is explicitly marked "n.c." (not connected) in Nexperia's pinning diagram and internal die construction. It is an isolated thermal pad with no bond wire attachment. PCB layout must leave this terminal unconnected to avoid unintended shorts or parasitic coupling in high-frequency applications.
BZX84W-B30X 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):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 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-B30X FAQ
1.How can I place an order for BZX84W-B30X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B30X 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-B30X reliable?
The price and inventory of BZX84W-B30X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B30X is usually 5 days.
3.What payment methods are accepted for BZX84W-B30X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B30X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B30X?
BZX84W-B30X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B30X 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-B30X?
For technical support, including BZX84W-B30X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B30X requirements.
6.How does Aetrix verify that BZX84W-B30X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B30X 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-B30X meets industry standards.
7.What is the process for return or replacement of BZX84W-B30X?
All BZX84W-B30X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B30X, 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-B30X part is unused and in its original packaging.
Return procedure for BZX84W-B30X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B30X 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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