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Taiwan Semiconductor Corporation BZT52C18-G RHG
- Part No.:
- BZT52C18-G RHG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C18-G RHG.pdf
- Description:
- DIODE ZENER 18V 350MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
BZT52C18-G from Taiwan Semiconductor is a 5% tolerance, 18 V Zener diode in SOD-123 package, rated for 350 mW power dissipation, with 45 Ω dynamic impedance at 5 mA test current and 0.1 µA leakage current at 12.6 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power DC regulation circuits.
For engineers reviewing the BZT52C18-G datasheet, BZT52C18-G pinout, BZT52C18-G application, or BZT52C18-G equivalent, key selection criteria include nominal Zener voltage (18 V), tight 5% tolerance, SOD-123 surface-mount compatibility, thermal resistance (357 °C/W), and junction temperature range (–55 to +150 °C).
Technical Context
The BZT52C18-G operates as a single-die, silicon planar Zener diode optimized for stable reverse-breakdown regulation under controlled test conditions (IZT = 5 mA). Its 18 V nominal Zener voltage exhibits a +12.4 mV/°C temperature coefficient and maintains ≤45 Ω dynamic impedance at IZT.
Designed for surface-mount assembly, it features matte tin-plated leads compliant with J-STD-002 solderability, meets JESD 201 Class 1A whisker resistance, and carries a moisture sensitivity level (MSL) 1 rating per J-STD-020 - eliminating bake requirements prior to reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.8–19.1 V (min–max at IZT = 5 mA; ±5% tolerance) |
| Power Dissipation (PD) | 350 mW (maximum continuous power at TA = 25 °C; derates linearly above 25 °C) |
| Dynamic Impedance (ZZT) | 45 Ω (measured at IZT = 5 mA; determines regulation stability under load variation) |
| Leakage Current (IR) | 0.1 µA max at VR = 12.6 V (ensures minimal standby current in clamping applications) |
| Junction Temperature (TJ) | –55 to +150 °C (supports operation in automotive under-hood and industrial ambient environments) |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA (enables use as low-drop rectifier or ESD protection element in bidirectional configurations) |
| Thermal Resistance (RθJA) | 357 °C/W (dictates board-level copper area requirements for thermal management at full PD) |
Pinout & Package
Package: SOD-123 - surface-mount plastic case with cathode band marking; dimensions per Taiwan Semiconductor outline drawing; weight ≈10.55 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node in regulation; defines polarity for reverse-bias operation |
| Cathode | Zener breakdown terminal / voltage reference output | Marked by band; connected to regulated rail; supplies stable 18 V reference when reverse-biased ≥12.6 V |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables tighter regulation margins than 10% parts, reducing need for post-regulation trimming in feedback networks |
| SOD-123 package with MSL 1 rating | Supports standard reflow without pre-bake, compatible with high-volume automated assembly lines |
| RoHS-compliant and halogen-free | Meets IEC 61249-2-21 and global environmental compliance mandates for consumer and industrial end equipment |
| Junction temperature range –55 to +150 °C | Validates suitability for extended-temperature applications including automotive body control modules and outdoor power supplies |
Applications
| USB Port Overvoltage Protection | Microcontroller Reset Circuit Reference |
|---|---|
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events or ESD discharge. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector, diverting excess energy to ground before IC damage occurs. Use Value: Leverages 18 V breakdown and 0.1 µA leakage at 12.6 V to avoid false triggering while clamping >18 V transients reliably. |
Use Scenario: Providing stable reset threshold voltage for microcontroller brown-out detection circuitry. IC Role / Device Role / Timing Role: Precision voltage reference source feeding comparator input in discrete reset generator. Use Value: 5% tolerance and +12.4 mV/°C TC ensure reset threshold remains within spec across –40 to +85 °C operating range. |
| Industrial Sensor Signal Conditioning | Low-Power IoT Node Voltage Regulation |
Use Scenario: Biasing op-amp input stages or setting reference points in analog front-end signal chains. IC Role / Device Role / Timing Role: Stable DC reference node for gain-setting resistors and offset calibration networks. Use Value: Low 45 Ω ZZT minimizes reference drift under varying sensor load currents, improving measurement repeatability. |
Use Scenario: Regulating supply to ultra-low-power MCU peripherals (RTC, EEPROM, sensors) in battery-powered edge nodes. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant 18 V rail for high-voltage sensor interfaces or RF front-end biasing. Use Value: 350 mW rating and 0.9 V forward drop allow dual-mode operation - regulation in reverse, rectification in forward - optimizing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5245B-7-F (Diodes Inc.) | 18 V nominal, ±5% tolerance, 350 mW, SOD-123, but higher ZZT = 50 Ω at 20 mA (vs. 45 Ω at 5 mA for BZT52C18-G) | Higher test current shifts optimal regulation point; less stable at low-current bias typical in sensor references | Select BZT52C18-G where low-IZ stability and tighter thermal coefficient (+12.4 vs. +13.0 mV/°C) are critical |
| SZBZX84-C18LT1G (onsemi) | 18 V nominal, ±5%, 300 mW (lower than 350 mW), SOT-23 package (not SOD-123), ZZT = 40 Ω at 5 mA | SOT-23 requires PCB redesign; lower PD limits sustained clamp duty cycle in surge-prone environments | Choose BZT52C18-G when SOD-123 footprint, higher power margin, and proven MSL 1 reliability are required |
Compared with MMBZ5245B-7-F and SZBZX84-C18LT1G, the BZT52C18-G delivers superior low-current regulation stability, higher power headroom, and drop-in compatibility with existing SOD-123 layouts - making it preferred for precision reference and industrial-grade clamping.
Availability
BZT52C18-G is available at Aetrix Electronics and suitable for USB protection circuits, microcontroller reset generators, industrial sensor signal conditioning, and low-power IoT node voltage regulation requiring stable component supply and long-term manufacturability.
Supply support for BZT52C18-G 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 Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete devices, analog ICs, and power management solutions for industrial, computing, and consumer markets.
The BZT52C series was developed to deliver high-reliability, RoHS-compliant Zener diodes with tight tolerances and robust thermal performance for space-constrained, high-volume SMT applications.
FAQ
What is the exact Zener voltage range for BZT52C18-G at 5 mA test current?
The BZT52C18-G has a guaranteed Zener voltage range of 16.8 V (minimum) to 19.1 V (maximum) when tested at IZT = 5 mA and TA = 25 °C. This ±5% tolerance is specified in the Taiwan Semiconductor datasheet Version C2007, Table "ELECTRICAL SPECIFICATIONS", row for BZT52C18-G.
Is BZT52C18-G suitable for reflow soldering without pre-baking?
Yes, the BZT52C18-G carries Moisture Sensitivity Level (MSL) 1 per J-STD-020, meaning it can be subjected to standard Pb-free reflow profiles without prior baking. Its SOD-123 package uses molding compound rated UL 94V-0 and matte tin-plated leads compliant with J-STD-002 solderability requirements.
What is the maximum leakage current specification for BZT52C18-G, and at what voltage is it measured?
The BZT52C18-G specifies a maximum leakage current (IR) of 0.1 µA at VR = 12.6 V (70% of nominal VZ). This value is confirmed in the "ELECTRICAL SPECIFICATIONS" table under the "IR @ VR" column for the BZT52C18-G row, ensuring minimal standby loss in high-impedance reference circuits.
Does BZT52C18-G have a defined temperature coefficient, and what is its value?
Yes, the BZT52C18-G has a typical temperature coefficient of +12.4 mV/°C, measured at IZTC = 5 mA. This positive coefficient indicates that its Zener voltage increases linearly with junction temperature - a key parameter for designing temperature-stable references across –55 to +150 °C.
Can BZT52C18-G be used in bidirectional ESD protection configurations?
While primarily designed as a unidirectional Zener, the BZT52C18-G's 0.9 V forward voltage at 10 mA enables limited bidirectional use: forward conduction clamps negative transients, while reverse breakdown regulates positive surges above 18 V. However, dedicated TVS diodes are recommended for IEC 61000-4-2 compliance.
BZT52C18-G RHG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 12.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52C18-G RHG FAQ
1.How can I place an order for BZT52C18-G RHG through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C18-G 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 BZT52C18-G RHG reliable?
The price and inventory of BZT52C18-G RHG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C18-G RHG is usually 5 days.
3.What payment methods are accepted for BZT52C18-G RHG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C18-G RHG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C18-G RHG?
BZT52C18-G RHG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C18-G 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 BZT52C18-G RHG?
For technical support, including BZT52C18-G RHG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C18-G RHG requirements.
6.How does Aetrix verify that BZT52C18-G RHG is sourced from the original manufacturer or authorized distributors?
All BZT52C18-G 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 BZT52C18-G RHG meets industry standards.
7.What is the process for return or replacement of BZT52C18-G RHG?
All BZT52C18-G RHG units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C18-G 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 BZT52C18-G RHG part is unused and in its original packaging.
Return procedure for BZT52C18-G RHG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52C18-G RHG Tags
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