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Nexperia USA Inc. BZT52-C20X
- Part No.:
- BZT52-C20X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52-C20X.pdf
- Description:
- DIODE ZENER 20V 350MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,485
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Product details
Overview
BZT52-C20X from Nexperia is a ±5 % tolerance Zener diode in SOD123 package, rated for 20 V nominal Zener voltage at 5 mA test current, 220 Ω maximum differential resistance, and 590 mW total power dissipation - used for precision voltage reference and low-power regulation in power supply feedback paths and sensor biasing circuits.
For engineers reviewing the BZT52-C20X datasheet, BZT52-C20X pinout, BZT52-C20X application, or BZT52-C20X equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (210 K/W junction-to-solder-point), reverse leakage (<0.05 μA at 15.2 V), temperature coefficient (+14 mV/K), and SOD123 surface-mount compatibility with standard reflow profiles.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its 20 V nominal Zener voltage is specified at IZ = 5 mA with ±5 % tolerance (C-series), and exhibits a positive temperature coefficient of +14 mV/K, indicating voltage increases with junction temperature.
The device features low differential resistance (220 Ω max) for tight regulation under dynamic current changes, and supports non-repetitive peak reverse power up to 40 W for transient suppression. Thermal design relies on FR4 PCB mounting with 1 cm² cathode pad to achieve 55 K/W junction-to-solder-point resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 18.8 V to 21.2 V at IZ = 5 mA - defines regulated output range for feedback or reference use |
| Differential Resistance rdif | 220 Ω max - limits voltage deviation under ±1 mA load change (ΔV ≈ ±0.22 V) |
| Reverse Current IR | <0.05 μA at VR = 15.2 V - ensures minimal quiescent power loss in high-impedance bias networks |
| Temperature Coefficient SZ | +14 mV/K - enables predictable drift compensation in temperature-stable references |
| Total Power Dissipation Ptot | 590 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Forward Voltage VF | 0.9 V max at IF = 10 mA - defines conduction threshold when used in polarity protection or clamping |
| Junction Temperature Tj | 150 °C max - constrains thermal derating above 25 °C ambient per Rth(j-a) = 210 K/W |
Pinout & Package
SOD123 plastic surface-mounted package: 2-terminal, flat lead, 2.80 mm × 1.70 mm body, 0.70 mm lead pitch, cathode marked by band on end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking band identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased during Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing without trimming in non-critical analog circuits |
| Low 220 Ω differential resistance | Maintains regulation stability under ±1 mA load variation typical in op-amp reference inputs |
| 150 °C maximum junction temperature | Supports operation in industrial environments with localized heating near power components |
| SOD123 footprint compatibility | Matches IPC-7351B standard for automated placement and reflow soldering on dense PCBs |
| +14 mV/K temperature coefficient | Allows predictable thermal drift modeling in temperature-compensated voltage references |
Applications
| Power Supply Feedback | Sensor Bias Reference |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck converter feedback loop via optocoupler input. IC Role / Device Role / Timing Role: Zener diode provides stable 20 V reference to drive optocoupler LED, enabling closed-loop voltage control. Use Value: ±5 % tolerance and 220 Ω rdif ensure <±0.5 % output voltage drift over line/load variations. |
Use Scenario: Providing precise bias voltage to MEMS pressure sensor bridge excitation terminals. IC Role / Device Role / Timing Role: Acts as low-noise, low-drift voltage reference replacing higher-cost IC references in battery-powered IoT nodes. Use Value: <0.05 μA reverse leakage minimizes standby current; +14 mV/K TC allows calibration offset correction. |
| Overvoltage Clamp | Microcontroller I/O Protection |
|
Use Scenario: Clamping transient surges on 24 V industrial bus lines before entering level-shifting circuitry. IC Role / Device Role / Timing Role: Zener conducts above 21.2 V to divert surge energy, protecting downstream logic interfaces. Use Value: 40 W non-repetitive peak power rating handles 100 μs transients without degradation. |
Use Scenario: Protecting 3.3 V microcontroller GPIO pins from accidental 5 V misconnection or ESD events. IC Role / Device Role / Timing Role: Placed between I/O line and ground to clamp voltages >21.2 V while remaining inert below 3.3 V. Use Value: 0.9 V forward voltage ensures no interference during normal 3.3 V signaling; SOD123 size fits tight layout constraints. |
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 MMBZ5243BLT1G | 20 V nominal, ±5 %, 225 Ω rdif, SOD123, but rated for only 350 mW Ptot | Limited to lower-power biasing due to 40 % lower power rating | Select when thermal budget is constrained and 350 mW suffices |
| Vishay BZX84-C20 | 20 V nominal, ±5 %, 220 Ω rdif, SOT-23 package (larger footprint, 3-pin) | Requires different PCB layout and may introduce parasitic inductance in high-frequency clamping | Select when existing SOT-23 footprint reuse is prioritized over board space |
Compared with MMBZ5243BLT1G, BZT52-C20X delivers 68 % higher power handling for sustained regulation; versus BZX84-C20, it reduces board area by 35 % and lowers parasitic inductance with its compact SOD123 two-terminal geometry.
Availability
BZT52-C20X is available at Aetrix Electronics and suitable for power supply feedback loops, sensor bias networks, overvoltage clamping circuits, and microcontroller I/O protection requiring stable component supply and consistent parametric performance across production batches.
Supply support for BZT52-C20X 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 BZT52 series targets general-purpose voltage regulation and reference applications in consumer, industrial, and computing systems where cost, size, and parametric consistency outweigh automotive qualification requirements.
FAQ
What is the maximum continuous reverse current the BZT52-C20X can sustain without exceeding its power limit?
At 25 °C ambient and mounted on an FR4 PCB with 1 cm² cathode pad, BZT52-C20X sustains up to 29.5 mA continuous reverse current before reaching its 590 mW power limit (20 V × 29.5 mA = 590 mW). Derating applies above 25 °C per its 210 K/W junction-to-ambient thermal resistance.
How does the +14 mV/K temperature coefficient affect regulation accuracy over –40 °C to +125 °C?
Over that 165 K range, the Zener voltage shifts +2.31 V (14 mV/K × 165 K), resulting in a 11.6 % deviation from nominal 20 V. This must be accounted for in wide-temperature applications; compensation is possible using complementary TC components or digital calibration.
Can BZT52-C20X replace BZT52-B20 in an existing design?
Yes, but with tolerance trade-off: BZT52-B20 offers ±2 % tolerance (19.6–20.4 V), while BZT52-C20X has ±5 % (18.8–21.2 V). Differential resistance is nearly identical (220 Ω vs. 220 Ω), so regulation stability remains comparable, but initial voltage accuracy degrades by ±3 %.
Is the SOD123 package compatible with standard reflow soldering profiles for lead-free assembly?
Yes - Nexperia specifies reflow soldering as the only recommended method. The SOD123 footprint matches IPC-7351B standards, and the device withstands JEDEC J-STD-020D-compliant peak temperatures up to 260 °C for ≤60 seconds, with no moisture sensitivity level (MSL) restriction.
BZT52-C20X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±6%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52-C20X FAQ
1.How can I place an order for BZT52-C20X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52-C20X 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 BZT52-C20X reliable?
The price and inventory of BZT52-C20X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52-C20X is usually 5 days.
3.What payment methods are accepted for BZT52-C20X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52-C20X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52-C20X?
BZT52-C20X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52-C20X 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 BZT52-C20X?
For technical support, including BZT52-C20X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52-C20X requirements.
6.How does Aetrix verify that BZT52-C20X is sourced from the original manufacturer or authorized distributors?
All BZT52-C20X 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 BZT52-C20X meets industry standards.
7.What is the process for return or replacement of BZT52-C20X?
All BZT52-C20X units undergo pre-shipment inspection (PSI). If there is an issue with BZT52-C20X, 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 BZT52-C20X part is unused and in its original packaging.
Return procedure for BZT52-C20X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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