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Diodes Incorporated BZX84C30W-7
- Part No.:
- BZX84C30W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84C30W-7.pdf
- Description:
- DIODE ZENER 30V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:4,716
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Product details
Overview
BZX84C30W-7 from Diodes Incorporated is a 30 V, 200 mW surface-mount Zener diode in SOT-323 package, rated for 2 mA test current with 28–32 V zener voltage range, 80 Ω maximum zener impedance at 2 mA, and 0.1 µA maximum reverse leakage at 21 V, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX84C30W-7 datasheet, BZX84C30W-7 pinout, BZX84C30W-7 application, or BZX84C30W-7 equivalent, key selection criteria include zener voltage tolerance (±6.7%), thermal resistance (625 K/W), junction temperature range (−65 to +125 °C), RoHS-compliant matte tin plating, and ultra-small SOT-323 footprint for space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. It uses planar die construction for consistent parametric performance and low leakage, with specified zener voltage measured at IZT = 2 mA and temperature coefficient of +24.4 to +29.4 mV/°C.
The device exhibits 80 Ω dynamic impedance at 2 mA test current and 300 Ω at knee current (IZK = 0.5 mA), enabling predictable regulation behavior in feedback networks and voltage clamp circuits where low noise and tight voltage control are required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30.0 V nominal, 28.0–32.0 V range at IZT = 2 mA - defines regulation setpoint with ±6.7% tolerance |
| Power Dissipation (PD) | 200 mW at TA = 25 °C - limits continuous power handling on FR4 board with recommended pad layout |
| Zener Impedance (ZZT) | 80 Ω max at IZT = 2 mA - determines output voltage stability under small-signal current variation |
| Reverse Leakage (IR) | 0.1 µA max at VR = 21 V - ensures minimal error current in high-impedance reference paths |
| Thermal Resistance (RθJA) | 625 K/W - indicates junction-to-ambient temperature rise per watt dissipated on standard FR4 |
| Operating Temperature | −65 to +125 °C - supports industrial and automotive ambient environments without derating below −40 °C |
| Temperature Coefficient | +24.4 to +29.4 mV/°C at IZT = 5 mA - quantifies voltage drift with temperature in precision references |
Pinout & Package
Package: SOT-323 - ultra-small plastic surface-mount case (2.0–2.2 mm length × 1.15–1.35 mm width × 0.9–1.0 mm height), UL 94V-0 rated, moisture sensitivity level 1, lead-free matte tin plating over Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward conduction terminal / cathode reference point in reverse bias | Connected to lower-potential node in zener regulator; polarity marked by cathode band on package top view |
| Cathode (K) | Zener breakdown terminal / voltage reference output | Connected to regulated output node; carries reverse current during regulation; marked with cathode band |
| Case / Exposed Pad | Non-electrical mechanical termination | No internal connection; serves only as structural support and thermal path via solder joint to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable zener voltage distribution and low parameter drift across production lots |
| 200 mW power rating | Supports regulation in low-current analog stages (e.g., op-amp biasing, ADC reference) without heatsinking |
| SOT-323 ultra-small footprint | Enables placement in dense layouts such as portable sensor modules and wearables with <2.2 mm × 1.4 mm board area |
| Lead-free / RoHS compliant | Meets global environmental compliance requirements without compromising solderability or reliability |
| Green molding compound | Halogen-free encapsulation material meeting IPC-4101D/93 requirements for flame retardancy and emissions |
Applications
| Portable Sensor Reference | USB-C Power Monitor Clamp |
|---|---|
Use Scenario: Providing stable 30 V reference for analog front-end of battery-powered gas sensors operating from 3.3 V rail via boost converter. IC Role / Device Role / Timing Role: Zener diode acts as shunt voltage reference for ADC input scaling and offset calibration. Use Value: Tight 28–32 V tolerance and low 0.1 µA leakage ensure measurement accuracy within ±0.5% full-scale over −20 to +70 °C. | Use Scenario: Clamping overvoltage transients on USB-C CC line during hot-plug events in embedded host controllers. IC Role / Device Role / Timing Role: Zener diode functions as bidirectional transient voltage suppressor with 30 V clamping threshold. Use Value: 200 mW rating and 80 Ω impedance allow fast response to 100 ns spikes while limiting peak voltage to ≤32 V. |
| Industrial PLC Analog Input | Low-Power IoT Node Regulator |
Use Scenario: Stabilizing 30 V auxiliary supply for isolated current-loop transmitter in 24 V DC fieldbus systems. IC Role / Device Role / Timing Role: Zener diode serves as primary shunt regulator in unregulated linear post-regulator stage. Use Value: −65 to +125 °C operating range and 625 K/W thermal resistance enable reliable operation in cabinet-mounted enclosures. | Use Scenario: Generating local 30 V bias for RF power amplifier in sub-GHz LoRaWAN end-node powered by coin cell. IC Role / Device Role / Timing Role: Zener diode provides low-quiescent-voltage reference for charge-pump feedback loop. Use Value: 0.1 µA leakage minimizes standby current draw, extending battery life beyond 5 years in sleep-dominated duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5261B-7-F | 30 V nominal, 225 mW rating, 100 Ω ZZT, SOT-23 package | Larger footprint (2.9 × 1.3 mm vs. 2.2 × 1.4 mm); higher thermal resistance (714 K/W) | Preferred when higher power margin is needed and board space allows SOT-23 |
| 1SMA5938BT3G | 30 V nominal, 1.5 W rating, 10 Ω ZZT, SMA package | Surface-mount but significantly larger (4.5 × 2.7 mm); suited for higher-current regulation | Select only when >200 mW dissipation or <10 Ω impedance is required |
Compared with MMBZ5261B-7-F and 1SMA5938BT3G, BZX84C30W-7 offers optimal balance of ultra-compact size, adequate 200 mW rating, and industry-standard SOT-323 compatibility for space-limited, low-power regulation tasks.
Availability
BZX84C30W-7 is available at Aetrix Electronics and suitable for portable sensor reference, USB-C power monitor clamp, and industrial PLC analog input requiring stable component supply with full traceability and lifecycle management.
Supply support for BZX84C30W-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing facilities in China, Taiwan, and the U.S.
The BZX84 series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-reliability voltage regulation and reference in consumer, industrial, and computing applications.
FAQ
What is the maximum reverse voltage before breakdown for BZX84C30W-7?
The BZX84C30W-7 has a nominal zener voltage of 30.0 V with a guaranteed range of 28.0–32.0 V at IZT = 2 mA. Breakdown begins near the minimum value (28.0 V) and is fully established by 32.0 V. It is not rated for sustained reverse voltage above 32.0 V without exceeding power limits.
Can BZX84C30W-7 be used in place of a 33 V Zener diode?
No - BZX84C30W-7 is specifically characterized for 30 V regulation (28–32 V range). Substituting it for a 33 V part (e.g., BZX84C33W) risks undershooting the required reference voltage by up to 3 V, potentially causing system-level errors in feedback loops or protection thresholds.
Is the SOT-323 package of BZX84C30W-7 compatible with reflow soldering per J-STD-020?
Yes - the SOT-323 package is rated for moisture sensitivity level 1 and supports standard Pb-free reflow profiles. Its matte tin finish ensures reliable wetting, and the 0.006 g mass enables uniform heating. Recommended pad layout is documented in Diodes' AP02001 application note.
Does BZX84C30W-7 have a specified capacitance value for high-frequency decoupling?
No - the datasheet does not specify junction capacitance for BZX84C30W-7. While typical Zeners in this family exhibit ~2–5 pF at 1 V reverse bias, this part is not characterized or optimized for RF bypass; dedicated ceramic capacitors remain appropriate for decoupling above 1 MHz.
BZX84C30W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±7%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 21 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84C30W-7 FAQ
1.How can I place an order for BZX84C30W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C30W-7 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 BZX84C30W-7 reliable?
The price and inventory of BZX84C30W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C30W-7 is usually 5 days.
3.What payment methods are accepted for BZX84C30W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C30W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C30W-7?
BZX84C30W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C30W-7 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 BZX84C30W-7?
For technical support, including BZX84C30W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C30W-7 requirements.
6.How does Aetrix verify that BZX84C30W-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C30W-7 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 BZX84C30W-7 meets industry standards.
7.What is the process for return or replacement of BZX84C30W-7?
All BZX84C30W-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C30W-7, 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 BZX84C30W-7 part is unused and in its original packaging.
Return procedure for BZX84C30W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C30W-7 Tags
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