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Taiwan Semiconductor Corporation BZT52B18 RHG
- Part No.:
- BZT52B18 RHG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52B18 RHG.pdf
- Description:
- DIODE ZENER 18V 500MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:21,734
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Product details
Overview
BZT52B18 RHG from Taiwan Semiconductor is a surface-mount 18 V ±2% tolerance Zener diode in SOD-123F package, rated for 500 mW power dissipation, with 45 Ω dynamic impedance at 5 mA test current and 0.045 μA reverse leakage at 12.6 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZT52B18 RHG datasheet, BZT52B18 RHG pinout, BZT52B18 RHG application, or BZT52B18 RHG equivalent, key selection criteria include zener voltage tolerance (±2%), thermal resistance (350 °C/W), forward voltage (≤1.0 V @ 10 mA), cathode-band polarity marking, and halogen-free SOD-123F packaging compliant with RoHS and MSL Level 1.
Technical Context
This device operates as a two-terminal voltage reference using silicon PN junction breakdown, with zener voltage specified under 10 ms pulse conditions and tested at IZT = 5 mA. Its 18.00 V nominal zener voltage is guaranteed within ±2% across production lots, and dynamic impedance is measured with 10% RMS AC superimposed on DC bias.
The BZT52B18 RHG exhibits low reverse leakage (IR ≤ 0.045 μA @ VR = 12.6 V) and stable thermal performance up to TJ = 150 °C, supported by a 350 °C/W junction-to-ambient thermal resistance and moisture sensitivity level 1 rating for standard reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.64–18.36 V at IZT = 5 mA; enables precise 18 V rail clamping with tight process control |
| Power Dissipation (PD) | 500 mW at TA = 25 °C; supports continuous operation in compact SMD layouts without forced cooling |
| Dynamic Impedance (ZZT) | 45 Ω at IZT = 5 mA; ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | ≤0.045 μA at VR = 12.6 V; maintains high-impedance standby state in battery-powered sensing nodes |
| Forward Voltage (VF) | ≤1.0 V at IF = 10 mA; allows use as bidirectional ESD clamp when paired with series resistor |
| Thermal Resistance (RθJA) | 350 °C/W; defines maximum ambient temperature derating for reliable 500 mW operation on standard FR-4 |
| Junction Temperature (TJ) | −65 to +150 °C; permits deployment in industrial control enclosures without thermal shutdown |
Pinout & Package
Package: SOD-123F - flat-lead, small-outline plastic case with matte tin (Sn) plating over nickel (Ni) underplate, cathode indicated by band, weight 8.85 ± 0.5 mg, dimensions A=1.50–1.70 mm, B=3.30–3.90 mm, C=0.50–0.70 mm, D=2.50–2.70 mm, E=0.80–1.15 mm, F=0.05–0.20 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias | Connected to lower-potential node in regulation path; must be routed with adequate copper for 10 mA max forward conduction |
| Cathode | Current exit terminal during reverse breakdown | Marked by band; ties to regulated voltage rail; requires thermal relief pad for soldering reliability per MIL-STD-202 Method 208 |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Reduces need for post-production trimming in voltage reference designs for ADC biasing and sensor excitation |
| SOD-123F halogen-free package | Meets IEC 61249-2-21 requirements and supports lead-free reflow profiles up to 260 °C/10 s |
| Moisture Sensitivity Level 1 | Eliminates baking preconditioning before assembly, lowering manufacturing cost and cycle time |
| Low IR (0.045 μA @ 12.6 V) | Minimizes quiescent current drain in always-on IoT endpoint regulators and backup power supervisors |
| 500 mW power rating | Enables single-device transient suppression for 12–24 V industrial bus lines without external heat sinking |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Zener reference diode providing 18 V regulated bias to Wheatstone bridge amplifier stage. Use Value: Tight ±2% VZ tolerance ensures <0.5% gain error across temperature, improving measurement repeatability in 0–70 °C operating range. | Use Scenario: Overvoltage protection on USB-C VBUS line during hot-plug events with variable source negotiation. IC Role / Device Role / Timing Role: Shunt clamp limiting VBUS to 18 V during fault conditions exceeding PD contract voltage. Use Value: 45 Ω ZZT and 500 mW PD allow safe absorption of 200 ms 2 A surge without thermal runaway per USB-IF compliance testing. |
| Smart Meter Reference Supply | Automotive Body Control Module (BCM) Wake-Up Circuit |
Use Scenario: Generating stable 18 V auxiliary supply for metrology ICs and real-time clock backup in ANSI C12.20-certified meters. IC Role / Device Role / Timing Role: Precision voltage reference enabling accurate energy calculation under wide input voltage swings (85–265 VAC). Use Value: 0.045 μA IR at 12.6 V minimizes battery drain during 10-year meter lifetime, extending CR2032 coin cell service interval. | Use Scenario: Low-current wake-up detection circuit monitoring LIN bus voltage transitions in vehicle door modules. IC Role / Device Role / Timing Role: Reverse-biased Zener establishing 18 V threshold for wake-on-voltage comparator input. Use Value: MSL Level 1 rating and −65 to +150 °C TJ range ensure robust operation through automotive thermal cycling and humidity exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5245B-7-F | Same 18 V nominal, ±5% tolerance (vs. ±2%), 350 mW PD, SOT-23 package | Higher leakage (1.0 μA @ 14.4 V), larger footprint mismatch vs. SOD-123F | Acceptable where tighter voltage tolerance is not required and board space allows SOT-23 placement |
| 1N4746A | Through-hole DO-41, 18 V ±5%, 1 W PD, RθJA ≈ 50 °C/W | No SMD compatibility; higher thermal mass limits response to fast transients | Only suitable for prototyping or legacy through-hole designs where rework is acceptable |
Compared with MMBZ5245B-7-F and 1N4746A, the BZT52B18 RHG delivers superior voltage accuracy and SMD manufacturability for high-volume consumer and industrial PCBs, while its halogen-free SOD-123F package meets modern environmental compliance mandates without sacrificing electrical performance.
Availability
BZT52B18 RHG is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery clamp circuits, and smart meter reference supplies requiring stable component supply with full RoHS and halogen-free compliance.
Supply support for BZT52B18 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 Corporation is a vertically integrated semiconductor manufacturer specializing in discrete devices, analog ICs, and power management solutions, headquartered in Hsinchu Science Park.
The BZT52B18 RHG belongs to the Small Signal Product family, engineered for high-precision, low-power voltage regulation and protection in space-constrained SMD applications across industrial, computing, and consumer electronics.
FAQ
What is the zener voltage tolerance of BZT52B18 RHG?
The BZT52B18 RHG has a zener voltage tolerance of ±2% at IZT = 5 mA, with a nominal value of 18.00 V and a guaranteed range of 17.64 V to 18.36 V. This tight tolerance is confirmed in the Electrical Characteristics table of DS_S1405026 Version F15 and applies across the full operating temperature range of −65 °C to +150 °C.
Is BZT52B18 RHG compatible with lead-free reflow soldering?
Yes, the BZT52B18 RHG is qualified for high-temperature lead-free reflow soldering at 260 °C for 10 seconds, as stated in the Mechanical Data section. Its matte tin (Sn) lead finish over nickel (Ni) underplate and SOD-123F halogen-free compound meet J-STD-020 MSL Level 1 requirements without preconditioning.
What is the maximum reverse leakage current for BZT52B18 RHG?
The maximum reverse leakage current (IR) for BZT52B18 RHG is 0.045 μA at VR = 12.6 V, per the Electrical Characteristics table. This ultra-low leakage supports long-term battery operation in always-on monitoring circuits and contributes to stable reference performance in precision analog front-ends.
Does BZT52B18 RHG have polarity marking?
Yes, the BZT52B18 RHG uses a cathode band to indicate polarity, consistent with industry-standard SOD-123F packaging. The band identifies the cathode terminal, which must be connected to the higher-potential side of the circuit during reverse-bias operation for proper zener regulation or clamping function.
What is the thermal resistance (RθJA) of BZT52B18 RHG?
The junction-to-ambient thermal resistance (RθJA) of BZT52B18 RHG is 350 °C/W, as specified in the Maximum Ratings table. This value assumes standard PCB mounting on FR-4 with typical copper land patterns and defines the allowable ambient temperature derating curve for sustained 500 mW operation.
BZT52B18 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):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 12.6 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
BZT52B18 RHG FAQ
1.How can I place an order for BZT52B18 RHG through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52B18 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 BZT52B18 RHG reliable?
The price and inventory of BZT52B18 RHG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52B18 RHG is usually 5 days.
3.What payment methods are accepted for BZT52B18 RHG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52B18 RHG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52B18 RHG?
BZT52B18 RHG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52B18 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 BZT52B18 RHG?
For technical support, including BZT52B18 RHG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52B18 RHG requirements.
6.How does Aetrix verify that BZT52B18 RHG is sourced from the original manufacturer or authorized distributors?
All BZT52B18 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 BZT52B18 RHG meets industry standards.
7.What is the process for return or replacement of BZT52B18 RHG?
All BZT52B18 RHG units undergo pre-shipment inspection (PSI). If there is an issue with BZT52B18 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 BZT52B18 RHG part is unused and in its original packaging.
Return procedure for BZT52B18 RHG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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