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Diodes Incorporated BZX84C20T-7-F
- Part No.:
- BZX84C20T-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOT-523
- Datasheet:
-
BZX84C20T-7-F.pdf
- Description:
- DIODE ZENER 20V 150MW SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:9,452
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Product details
Overview
BZX84C20T-7-F from Diodes Incorporated is a 20 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 5 mA test current with ±1.2 V tolerance (18.8–21.2 V), 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 BZX84C20T-7-F datasheet, BZX84C20T-7-F pinout, BZX84C20T-7-F application, or BZX84C20T-7-F equivalent, key selection criteria include nominal Zener voltage accuracy, thermal resistance (833 °C/W), low leakage at rated VR, SOT-523 footprint compatibility, and RoHS-compliant matte tin plating.
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 breakdown characteristics and is optimized for low-current regulation (IZT = 5 mA) with specified Zener impedance (ZZT = 55 Ω) and knee impedance (ZZK = 225 Ω).
Its temperature coefficient of +14.4 to +18.0 mV/°C at 5 mA enables predictable drift compensation in reference designs. The device is rated for operation from –65 °C to +150 °C and exhibits 0.1 µA reverse current at VR = 14 V, supporting low-power standby and sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal, 18.8–21.2 V range at IZT = 5 mA - defines regulation setpoint with ±6% tolerance |
| Power Dissipation (PD) | 150 mW at TA = 25 °C - limits continuous power handling on standard FR-4 PCB |
| Zener Impedance (ZZT) | 55 Ω at IZT = 5 mA - determines output voltage stability under small-signal load variation |
| Reverse Leakage (IR) | 0.1 µA at VR = 14 V - ensures minimal quiescent current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 833 °C/W - indicates significant self-heating at full power; derating required above 25 °C ambient |
| Tempco (TCVZ) | +14.4 to +18.0 mV/°C at IZT = 5 mA - quantifies voltage drift per degree, critical for temperature-sensitive references |
Pinout & Package
Package: SOT-523 - ultra-small 3-pin surface-mount plastic case (1.6 mm × 0.8 mm × 0.5 mm), UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to lower-potential node; reverse-biased during regulation |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to higher-potential rail; maintains stable voltage relative to anode |
| Case / Heat Slug (Pin 3) | Non-electrical thermal path | Not internally connected; provides mechanical anchoring and minor thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT-523 footprint | Enables high-density PCB layouts in space-constrained portable and wearable electronics |
| Planar die construction | Delivers tight VZ distribution and repeatable ZZT performance across production lots |
| Lead-free, RoHS-compliant plating | Matte tin finish over Alloy 42 leadframe meets global environmental compliance requirements |
| Low reverse leakage (0.1 µA @ 14 V) | Minimizes error in high-impedance voltage divider and sensor biasing networks |
Applications
| Portable Battery Monitoring | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage in compact wearables using resistive divider into ADC input. IC Role / Device Role / Timing Role: Precision voltage reference for ratio-metric scaling of ADC measurements. Use Value: Stable 20 V Zener point enables accurate 0–4.2 V cell reading with <±0.5% full-scale error over temperature. | Use Scenario: Providing bias voltage to bridge-based pressure transducers in factory automation nodes. IC Role / Device Role / Timing Role: Low-drift excitation reference for Wheatstone bridge arms. Use Value: +14.4 to +18.0 mV/°C tempco allows predictable offset correction in firmware calibration routines. |
| USB-C Power Negotiation Circuitry | Medical Diagnostic Instrument Reference |
Use Scenario: Setting threshold for CC line voltage detection in USB PD sink controllers. IC Role / Device Role / Timing Role: Clamping and level-setting element in analog comparator input stage. Use Value: 55 Ω ZZT ensures minimal hysteresis shift when CC line transitions between 0.2 V and 2.0 V states. | Use Scenario: Generating stable reference for analog front-end amplifiers in portable ECG units. IC Role / Device Role / Timing Role: Low-noise DC reference source for instrumentation amplifier gain-setting network. Use Value: 0.1 µA IR prevents loading errors in picoampere-level biopotential signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242BS-7-F | 20 V nominal, SOT-323 package, 200 mW PD, 30 Ω ZZT @ 20 mA | Higher power rating and lower impedance but larger footprint and different test current | Select when higher current capability (>5 mA) or lower dynamic impedance is required |
| BZX84C20LT1G | 20 V nominal, SOT-23 package, 350 mW PD, 55 Ω ZZT @ 5 mA | Larger SOT-23 footprint, higher power, same Zener impedance and test condition | Select when board layout allows SOT-23 and thermal margin requires >150 mW dissipation |
Compared with MMBZ5242BS-7-F and BZX84C20LT1G, BZX84C20T-7-F offers the smallest PCB area (SOT-523), lowest profile, and strictest leakage control (0.1 µA), making it optimal for ultra-compact, battery-sensitive designs where 150 mW and 5 mA operation suffice.
Availability
BZX84C20T-7-F is available at Aetrix Electronics and suitable for portable battery monitoring, industrial sensor signal conditioning, USB-C power negotiation circuitry, and medical diagnostic instrument reference requiring stable component supply and long-term sourcing continuity.
Supply support for BZX84C20T-7-F 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' general-purpose Zener diode product line, designed specifically for low-power voltage regulation, reference, and overvoltage protection in consumer, industrial, and computing applications.
FAQ
What is the maximum reverse voltage (VR) at which leakage current is guaranteed?
The datasheet specifies IR ≤ 0.1 µA at VR = 14 V. This is the highest reverse voltage at which leakage is tested and guaranteed. Operation above 14 V enters the Zener breakdown region, where current increases sharply per the V–I curve.
Can BZX84C20T-7-F be used in forward-bias applications?
Yes - as a standard silicon diode, it exhibits VF ≈ 0.9 V at IF = 10 mA. However, it is not optimized for forward conduction; its primary function and characterization are for reverse-bias Zener regulation.
Is the SOT-523 package compatible with standard reflow profiles?
Yes - the device is qualified for Pb-free reflow per J-STD-020D Level 1 moisture sensitivity, with recommended peak temperature ≤ 260 °C and time above 217 °C ≤ 60 seconds, matching standard lead-free assembly processes.
How does temperature affect regulation accuracy?
At IZT = 5 mA, the Zener voltage changes by +14.4 to +18.0 mV per °C rise. For example, a 50 °C ambient increase causes ~0.7–0.9 V upward shift - requiring compensation in precision references or limiting operating temperature range.
BZX84C20T-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±6%
- Power - Max:
- 150 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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-523
BZX84C20T-7-F FAQ
1.How can I place an order for BZX84C20T-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C20T-7-F 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 BZX84C20T-7-F reliable?
The price and inventory of BZX84C20T-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C20T-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C20T-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C20T-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C20T-7-F?
BZX84C20T-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C20T-7-F 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 BZX84C20T-7-F?
For technical support, including BZX84C20T-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C20T-7-F requirements.
6.How does Aetrix verify that BZX84C20T-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C20T-7-F 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 BZX84C20T-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C20T-7-F?
All BZX84C20T-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C20T-7-F, 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 BZX84C20T-7-F part is unused and in its original packaging.
Return procedure for BZX84C20T-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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