My Inquiry
My Account
Diodes Incorporated BZX84C20W-7
- Part No.:
- BZX84C20W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84C20W-7.pdf
- Description:
- DIODE ZENER 20V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,361
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84C20W-7 from Diodes Incorporated is a 20 V, 200 mW surface-mount Zener diode in SOT-323 package, rated for 5 mA test current with 18.8–21.2 V zener voltage range, 55 Ω dynamic impedance at 5 mA, and ±0.1 µA reverse leakage at 14 V, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX84C20W-7 datasheet, BZX84C20W-7 pinout, BZX84C20W-7 application, or BZX84C20W-7 equivalent, key selection criteria include zener voltage tolerance, dynamic impedance at nominal test current, power derating above 25°C, thermal resistance (625 K/W), and RoHS-compliant lead-free plating on SOT-323 terminals.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. It features planar die construction for consistent parametric performance and low temperature coefficient (14.4–18.0 mV/°C) optimized for 20 V nominal regulation.
The device is characterized at 25°C with 5 mA zener test current (IZT), exhibits 225 Ω maximum impedance at IZT, and supports operation from –65°C to +125°C ambient. Its ultra-small SOT-323 footprint enables high-density PCB layouts in space-constrained applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal, 18.8–21.2 V range at 5 mA - defines regulation setpoint tolerance for feedback or reference use |
| Power Dissipation (PD) | 200 mW at 25°C - limits continuous power handling before thermal derating begins |
| Zener Impedance (ZZT) | 55 Ω max at 5 mA - determines output voltage stability under small-signal current variation |
| Reverse Leakage (IR) | 0.1 µA max at 14 V - ensures minimal quiescent current in standby or low-power bias networks |
| Thermal Resistance (RθJA) | 625 K/W - indicates junction-to-ambient heat transfer efficiency on standard FR4 board |
| Temp Coefficient (TCVZ) | +14.4 to +18.0 mV/°C - quantifies voltage drift per degree rise above 25°C at 5 mA |
| Package | SOT-323 - 2.2 mm × 1.35 mm × 0.95 mm footprint with gull-wing leads for reflow assembly |
Pinout & Package
SOT-323 package with three terminals: anode (pin 1), cathode (pin 2), and no internal connection (pin 3). Cathode marked by band; polarity confirmed per Diodes Inc. top-view schematic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated output or reference node; marked with band |
| NC (Pin 3) | No internal connection | Unused terminal; electrically isolated and not bonded to die |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight parameter distribution and repeatable breakdown characteristics across production lots |
| Lead-free / RoHS-compliant plating | Matte tin finish over Alloy 42 leadframe meets global environmental compliance requirements |
| "Green" molding compound | Halogen-free encapsulant rated UL 94V-0, eliminating antimony trioxide flame retardants |
| Moisture sensitivity Level 1 | Allows unlimited floor life without dry-pack or baking prior to reflow soldering |
Applications
| Voltage Reference for ADC/DAC | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Provides stable 20 V reference for 12-bit SAR ADC input scaling circuitry. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown as precision shunt reference. Use Value: Maintains <±1% reference accuracy over temperature due to controlled TCVZ and low ZZT. | Use Scenario: Protects 24 V industrial sensor signal line from transient surges exceeding 25 V. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage at sensor amplifier input. Use Value: Absorbs up to 200 mW surge energy while holding clamped voltage ≤21.2 V. |
| Low-Power Bias Network | Microcontroller Reset Threshold |
Use Scenario: Generates 20 V bias for op-amp rail-splitter in battery-powered instrumentation. IC Role / Device Role / Timing Role: Passive voltage source in high-impedance divider network. Use Value: Draws only 0.1 µA leakage at 14 V, minimizing standby current drain. | Use Scenario: Sets precise 20 V reset threshold for 3.3 V microcontroller supervisory circuit. IC Role / Device Role / Timing Role: Zener-based comparator reference in discrete reset generator. Use Value: Enables accurate brown-out detection with ±0.6 V tolerance at 25°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5247BT1G | 20 V nominal, 500 mW rating, SOD-123 package, 22 Ω ZZT @ 20 mA | Higher power and lower impedance but larger footprint and different thermal profile | Select when higher surge capability or tighter regulation under load is required |
| BZX84-C20 | Same 20 V spec, but SOT-23 package, non-RoHS lead finish, 60 Ω ZZT @ 5 mA | Larger pad layout, legacy plating, slightly higher impedance | Select only for cost-sensitive legacy designs where RoHS is not mandated |
Compared with BZX84C20W-7, MMSZ5247BT1G offers superior power handling and lower impedance but requires SOD-123 layout changes, while BZX84-C20 sacrifices environmental compliance and thermal performance for SOT-23 compatibility.
Availability
BZX84C20W-7 is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, low-power biasing, and microcontroller reset applications requiring stable component supply and full RoHS compliance.
Supply support for BZX84C20W-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 and manufacturing operations across Asia and the Americas.
The BZX84 series belongs to Diodes Inc.'s general-purpose Zener diode product line, designed specifically for compact, low-power voltage regulation and protection in consumer, industrial, and computing applications.
FAQ
What is the maximum reverse voltage this Zener can sustain before breakdown?
The BZX84C20W-7 has a nominal zener voltage of 20 V, with a guaranteed breakdown range of 18.8 V to 21.2 V at 5 mA test current. It does not specify a distinct "maximum reverse voltage" beyond this range; operation above 21.2 V at IZT will increase power dissipation and must remain within the 200 mW limit and thermal derating curve.
Can this part be used in place of a 1N4744A?
No - the 1N4744A is a 14 V, 1 W through-hole Zener in DO-41 package, while BZX84C20W-7 is a 20 V, 200 mW SOT-323 surface-mount device. They differ in voltage rating, power capability, package, and thermal behavior; direct substitution would compromise regulation accuracy and reliability.
Is the SOT-323 package compatible with standard reflow profiles?
Yes - the BZX84C20W-7 is qualified for lead-free reflow per J-STD-020D, with Moisture Sensitivity Level 1, meaning it may be stored indefinitely at ambient conditions and processed using standard Pb-free peak temperatures up to 260°C without preconditioning or dry-baking.
What is the typical capacitance at 1 MHz and 0 V bias?
Per Figure 4 in the datasheet, the typical total capacitance for the BZX84C20W-7 is approximately 35 pF at 1 V reverse bias and 1 MHz. Capacitance decreases with increasing reverse voltage; at 0 V bias, it is not specified, but extrapolation from adjacent voltage points suggests ~40–45 pF.
BZX84C20W-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):
- 20 V
- Tolerance:
- ±6%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 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
BZX84C20W-7 FAQ
1.How can I place an order for BZX84C20W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C20W-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 BZX84C20W-7 reliable?
The price and inventory of BZX84C20W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C20W-7 is usually 5 days.
3.What payment methods are accepted for BZX84C20W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C20W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C20W-7?
BZX84C20W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C20W-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 BZX84C20W-7?
For technical support, including BZX84C20W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C20W-7 requirements.
6.How does Aetrix verify that BZX84C20W-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C20W-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 BZX84C20W-7 meets industry standards.
7.What is the process for return or replacement of BZX84C20W-7?
All BZX84C20W-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C20W-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 BZX84C20W-7 part is unused and in its original packaging.
Return procedure for BZX84C20W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C20W-7 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
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
