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Taiwan Semiconductor Corporation BZT52B20 RHG
- Part No.:
- BZT52B20 RHG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52B20 RHG.pdf
- Description:
- DIODE ZENER 20V 500MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:5,950
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Product details
Overview
BZT52B20 RHG from Taiwan Semiconductor is a surface-mount 20 V ±2% tolerance Zener diode in SOD-123F package, rated for 500 mW power dissipation, with 55 Ω dynamic impedance at 5 mA test current and 14.0 V maximum zener voltage at IZM, used for precision voltage regulation and overvoltage protection in low-power analog and digital supply rails.
For engineers reviewing the BZT52B20 RHG datasheet, BZT52B20 RHG pinout, BZT52B20 RHG application, or BZT52B20 RHG equivalent, key selection criteria include its 20.0 V nominal zener voltage, ±2% tolerance, 500 mW power rating, SOD-123F footprint compatibility, and guaranteed 260°C/10s soldering robustness - critical for high-reliability consumer, industrial, and automotive auxiliary circuits.
Technical Context
The BZT52B20 RHG operates as a silicon planar junction Zener diode optimized for stable reverse-biased voltage reference and clamping. Its 20.0 V nominal breakdown voltage is specified at IZT = 5 mA with VZ min/max of 19.60 V / 20.40 V, and exhibits 55 Ω dynamic impedance (ZZT) under that condition.
Thermal performance is defined by RθJA = 350 °C/W and maximum junction temperature TJ = +150 °C. Reverse leakage current IR is ≤0.045 μA at VR = 14.0 V, and forward voltage VF is ≤1.0 V at IF = 10 mA - confirming suitability for bidirectional signal conditioning and low-current bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.0 V nominal, 19.60–20.40 V range at IZT = 5 mA - enables precise 20 V rail stabilization with tight tolerance |
| Power Dissipation (PD) | 500 mW at TA = 25°C - supports continuous regulation in space-constrained SMD designs |
| Dynamic Impedance (ZZT) | 55 Ω at IZT = 5 mA - ensures low output impedance for stable reference under load variation |
| Reverse Leakage (IR) | ≤0.045 μA at VR = 14.0 V - minimizes standby current in battery-powered sensing nodes |
| Forward Voltage (VF) | ≤1.0 V at IF = 10 mA - allows use as low-drop rectifier or ESD clamp in signal paths |
| Package | SOD-123F - industry-standard 3.3–3.9 mm × 1.5–1.7 mm footprint with cathode band polarity marking |
| RoHS & Halogen-Free | Pb-free, RoHS compliant per 2011/65/EU; halogen-free per IEC 61249-2-21 - meets environmental compliance for global shipments |
Pinout & Package
SOD-123F package: flat lead, small outline plastic case with cathode band indicating terminal polarity; terminals are matte tin-plated, Ni-underplated, solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in reverse-bias regulation | Connected to ground or lower-potential node when used as shunt regulator |
| Cathode | Zener breakdown terminal / high-side connection in reverse-bias regulation | Connected to regulated voltage rail; cathode band provides visual polarity identification |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables accurate 20 V reference without post-production trimming in voltage monitor circuits |
| 500 mW power rating | Supports sustained clamping of transient surges up to 14 V in 3.3 V/5 V system rails |
| 260°C/10s soldering guarantee | Ensures reliability through standard reflow profiles without delamination or parametric shift |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to assembly - reduces manufacturing overhead and risk |
| Halogen-free compound | Meets stringent environmental standards for automotive and industrial end-equipment certifications |
Applications
| Power Supply Monitoring | Overvoltage Protection |
|---|---|
Use Scenario: Monitoring 24 V DC input to microcontroller-based industrial sensor node. IC Role / Device Role / Timing Role: Shunt Zener reference connected between supply and ADC input, scaling voltage for safe measurement. Use Value: 20.0 V ±2% breakdown ensures detection of >20.4 V faults before downstream IC damage occurs. | Use Scenario: Clamping surge on 12 V CAN transceiver power line during load dump events. IC Role / Device Role / Timing Role: Reverse-biased Zener placed between VCC and GND to clamp transients above 20 V. Use Value: 500 mW rating and 55 Ω ZZT allow absorption of short-duration spikes without thermal runaway. |
| Reference Voltage Source | Signal Level Translation |
Use Scenario: Providing stable 20 V reference for op-amp comparator threshold in battery charger control loop. IC Role / Device Role / Timing Role: Zener diode biased at 5 mA to generate fixed reference voltage for feedback network. Use Value: Low 55 Ω dynamic impedance maintains reference stability across temperature and supply variation. | Use Scenario: Bidirectional level shifting between 3.3 V logic and 20 V analog sensor interface. IC Role / Device Role / Timing Role: Used in series with series resistor to limit current during 20 V-to-3.3 V signal transitions. Use Value: Forward VF ≤1.0 V at 10 mA and reverse VZ = 20.0 V enable symmetric clamping in both directions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B-7-F (Diodes Inc.) | 20 V ±5% tolerance, 350 mW rating, SOT-23 package | Higher tolerance and lower power limit require derating in high-energy transient scenarios | Preferred where board space is constrained and ±5% regulation accuracy is acceptable |
| 1N4746A (ON Semiconductor) | 20 V ±5%, 1 W rating, DO-41 through-hole package | Larger footprint and axial lead form factor incompatible with SMD-only layouts | Selected for prototyping or legacy through-hole designs needing higher power headroom |
Compared with MMBZ5242B-7-F and 1N4746A, the BZT52B20 RHG offers tighter ±2% tolerance and SOD-123F compatibility for modern compact PCBs, while delivering sufficient 500 mW clamping capability for most embedded power-rail protection tasks - balancing precision, size, and thermal performance.
Availability
BZT52B20 RHG is available at Aetrix Electronics and suitable for power supply monitoring, overvoltage protection, reference voltage source, and signal level translation requiring stable component supply and full RoHS/halogen-free compliance.
Supply support for BZT52B20 RHG 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
Taiwan Semiconductor is a vertically integrated semiconductor manufacturer specializing in discrete devices, analog ICs, and power management solutions for industrial, automotive, and consumer markets.
The BZT52B20 RHG belongs to the BZT52B series of precision Zener diodes designed for surface-mount voltage regulation and protection in space-sensitive, high-reliability applications - emphasizing tight tolerance, robust solderability, and environmental compliance.
FAQ
What is the nominal zener voltage and tolerance of the BZT52B20 RHG?
The BZT52B20 RHG has a nominal zener voltage of 20.0 V with a tight ±2% tolerance, specified as 19.60 V minimum to 20.40 V maximum at IZT = 5 mA. This precision enables reliable voltage reference generation and overvoltage detection without calibration. The BZT52B20 RHG is tested under 10 ms pulse conditions per DS_S1405026 F15, ensuring repeatability in production screening.
What package type and mounting method does the BZT52B20 RHG use?
The BZT52B20 RHG uses the SOD-123F surface-mount package - a flat-lead, small-outline plastic case measuring 3.3–3.9 mm in length and 1.5–1.7 mm in width. It features matte tin-plated terminals with nickel underplate, qualified for 260°C/10s reflow soldering per MIL-STD-202 Method 208. Polarity is marked by a visible cathode band, and the device weighs 8.85 ± 0.5 mg.
What is the maximum power dissipation and thermal resistance of the BZT52B20 RHG?
The BZT52B20 RHG is rated for 500 mW maximum power dissipation at ambient temperature (TA = 25°C), with a junction-to-ambient thermal resistance (RθJA) of 350 °C/W. Its maximum junction temperature is +150 °C, and it follows the derating curve shown in Figure 4 of DS_S1405026 F15. These values define safe operating limits for continuous regulation or transient clamping in thermally constrained layouts.
How does the BZT52B20 RHG perform in reverse leakage and forward conduction?
The BZT52B20 RHG exhibits ≤0.045 μA reverse leakage current (IR) at VR = 14.0 V, supporting ultra-low-power monitoring functions. In forward bias, it delivers ≤1.0 V forward voltage (VF) at IF = 10 mA, enabling use as a low-drop clamping element or bidirectional signal limiter. These characteristics are confirmed in the Electrical Characteristics table of DS_S1405026 F15.
Is the BZT52B20 RHG compliant with environmental regulations?
Yes, the BZT52B20 RHG is Pb-free and RoHS compliant per Directive 2011/65/EU, and conforms to WEEE 2002/96/EC. It uses halogen-free epoxy compound per IEC 61249-2-21, and carries moisture sensitivity level 1 - eliminating pre-bake requirements. The "G" suffix in BZT52B20 RHG explicitly denotes green (halogen-free) compound per Taiwan Semiconductor's ordering information.
BZT52B20 RHG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 14 V
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52B20 RHG FAQ
1.How can I place an order for BZT52B20 RHG through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52B20 RHG 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 BZT52B20 RHG reliable?
The price and inventory of BZT52B20 RHG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52B20 RHG is usually 5 days.
3.What payment methods are accepted for BZT52B20 RHG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52B20 RHG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52B20 RHG?
BZT52B20 RHG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52B20 RHG 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 BZT52B20 RHG?
For technical support, including BZT52B20 RHG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52B20 RHG requirements.
6.How does Aetrix verify that BZT52B20 RHG is sourced from the original manufacturer or authorized distributors?
All BZT52B20 RHG 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 BZT52B20 RHG meets industry standards.
7.What is the process for return or replacement of BZT52B20 RHG?
All BZT52B20 RHG units undergo pre-shipment inspection (PSI). If there is an issue with BZT52B20 RHG, 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 BZT52B20 RHG part is unused and in its original packaging.
Return procedure for BZT52B20 RHG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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