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Vishay General Semiconductor - Diodes Division BZT52C47-E3-18
- Part No.:
- BZT52C47-E3-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
BZT52C47-E3-18.pdf
- Description:
- DIODE ZENER 47V 410MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,198
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Product details
Overview
BZT52C47-E3-18 from Vishay Semiconductors is a silicon planar Zener diode in SOD-123 package, rated for 47 V nominal Zener voltage at 2 mA test current, with ±5 % tolerance, 97 Ω dynamic resistance, and +8 to +12 × 10⁻⁴/°C temperature coefficient - used for precision voltage regulation and overvoltage protection in power supply feedback loops.
For engineers reviewing the BZT52C47-E3-18 datasheet, BZT52C47-E3-18 pinout, BZT52C47-E3-18 application, or BZT52C47-E3-18 equivalent, key selection considerations include its 47 V stabilization point, 500 mW maximum power dissipation on leaded FR-4 board, SOD-123 footprint compatibility, and commercial-grade RoHS-compliant construction.
Technical Context
This device operates as a single-element, unidirectional voltage reference diode with cathode-anode polarity. Its Zener breakdown mechanism provides stable reverse-biased voltage clamping under controlled test current (IZT = 2 mA), with thermal resistance junction-to-ambient of 420 K/W on FR-4 board.
The BZT52C47-E3-18 exhibits a positive temperature coefficient (+8 to +12 × 10⁻⁴/°C), indicating increasing Zener voltage with rising temperature - critical for thermal drift compensation in analog sensing and reference circuits where ambient variation exceeds ±20 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44.65 V min / 47 V nom / 49.35 V max at IZT = 2 mA - defines precise clamping threshold for 47 V rail regulation |
| Power Dissipation (Ptot) | 300 mW on FR-4 board - limits continuous current to ~6.4 mA at 47 V without heatsinking |
| Dynamic Resistance (ZZ) | 97 Ω at IZT = 2 mA - determines output impedance and load regulation error in shunt regulator designs |
| Temperature Coefficient (αVZ) | +8 to +12 × 10⁻⁴/°C - requires thermal derating above 45 °C ambient for <±1 % voltage stability |
| Maximum Reverse Current (IR) | 500 nA at VR = 35 V - ensures low leakage in high-impedance bias networks and sensor interfaces |
| Junction Temperature (Tj) | 150 °C - sets upper limit for thermal design margin when operating near Ptot limit |
| Package | SOD-123 - surface-mount, 2.7 mm × 1.55 mm footprint with cathode bar marking and MSL level 1 handling |
Pinout & Package
SOD-123 package: 2-terminal surface-mount device with cathode marked by a bar on the body; terminals are non-polarized beyond anode/cathode designation; no internal bonding wires or multi-die structure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-bias configuration; carries full Zener current during regulation |
| Cathode | Zener breakdown terminal | Marked with bar; connected to regulated voltage node; referenced to system ground or feedback point in SMPS controllers |
Key Features
| Feature | Design Value |
|---|---|
| Silicon planar Zener structure | Enables tight VZ tolerance (±5 %) and repeatable breakdown characteristics across production lots |
| E24-standard voltage grading | Ensures interoperability with standard 47 V reference designs and eliminates custom calibration in industrial controls |
| MSL Level 1 moisture sensitivity | Permits indefinite dry storage and reflow without baking - reduces manufacturing overhead in high-volume SMT lines |
| RoHS-compliant, halogen-free molding compound | Meets IPC-J-STD-020 and automotive ELV directives without requiring special disposal or compliance documentation |
| UL 94 V-0 flammability rating | Validates safety in enclosed power supplies and medical equipment where flame propagation must be suppressed |
Applications
| Industrial Power Supply Feedback | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Regulating 47 V auxiliary rail in isolated DC-DC converter for PLC I/O modules. IC Role / Device Role / Timing Role: Shunt voltage reference in TL431-based optocoupler feedback loop. Use Value: Maintains ±1.5 % output regulation across -40 to +85 °C ambient with <0.5 % line/load transient deviation. |
Use Scenario: Protecting microcontroller GPIO pins from load-dump transients in 42 V battery systems. IC Role / Device Role / Timing Role: Overvoltage clamp limiting input to 49.35 V peak during ISO 7637-2 Pulse 5a events. Use Value: Absorbs 100 ms, 60 V pulses without degradation, preserving MCU reset logic integrity. |
| Test Equipment Reference Source | LED Driver Open-Circuit Protection |
Use Scenario: Providing stable 47 V reference for digital multimeter ADC front-end calibration. IC Role / Device Role / Timing Role: Precision voltage source for DAC output trimming and offset nulling. Use Value: Delivers <10 ppm/°C drift over 25–60 °C range, enabling 5½-digit measurement accuracy. |
Use Scenario: Detecting LED string open-circuit fault in constant-current driver for street lighting. IC Role / Device Role / Timing Role: Zener-triggered shutdown signal when output voltage rises above 47 V due to LED failure. Use Value: Activates protection within 200 µs of fault, preventing MOSFET avalanche stress and driver IC damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5270BS-7-F | Same 47 V nominal Zener, but SOT-23 package (3-pin, dual-anode); 100 Ω ZZ; ±5 % tolerance; 225 mW Ptot | Requires different PCB layout; suited for space-constrained dual-rail designs needing shared cathode | Select when dual-Zener topology or tighter board area is required; verify thermal margin at 225 mW rating |
| 1N4750A | Through-hole DO-41 package; 47 V nominal; ±5 %; 1 Ω ZZ; 1 W Ptot; -8 to -12 mV/°C αVZ | Higher power handling and lower dynamic resistance, but incompatible with automated SMT assembly | Choose for prototyping, high-reliability legacy systems, or where >300 mW continuous dissipation is needed |
Compared with BZT52C47-E3-18, MMBZ5270BS-7-F trades SOD-123 simplicity for dual functionality in smaller area but lower power, while 1N4750A offers superior regulation performance and thermal headroom at the cost of manual assembly and larger footprint.
Availability
BZT52C47-E3-18 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECU protection circuits, test equipment references, and LED driver fault detection requiring stable component supply and full traceability.
Supply support for BZT52C47-E3-18 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
Vishay Semiconductors is a global supplier of discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing markets.
The BZT52 series targets cost-sensitive, high-volume voltage reference and protection applications with standardized E24 Zener values, SOD-123 packaging, and commercial-grade reliability.
FAQ
What is the maximum continuous Zener current for BZT52C47-E3-18 at 25 °C ambient?
The admissible Zener current for BZT52C47-E3-18 is 9 mA at Tamb = 25 °C, derived from its 300 mW power rating and 47 V nominal Zener voltage (300 mW ÷ 47 V ≈ 6.4 mA), with datasheet listing 9 mA as the absolute maximum under ideal thermal conditions. Actual design should limit to ≤6.4 mA for long-term reliability. BZT52C47-E3-18 must be derated linearly above 25 °C per the thermal resistance curve.
Does BZT52C47-E3-18 meet AEC-Q101 qualification?
No, BZT52C47-E3-18 is the commercial-grade variant with base ordering code ending in "-E3-18". AEC-Q101 qualified versions use the "-HE3_A-18" suffix (e.g., BZT52C47-HE3_A-18). BZT52C47-E3-18 lacks the extended temperature cycling, HTRB, and ESD validation required for automotive under-hood applications.
What is the cathode marking convention for BZT52C47-E3-18?
BZT52C47-E3-18 uses a cathode bar printed on the SOD-123 body - a visible dark band near one end of the package. Per Vishay's orientation diagram, the bar identifies the cathode terminal, which must connect to the higher-potential node in Zener operation. The marking code "YZ" appears adjacent to the bar per the electrical characteristics table.
Can BZT52C47-E3-18 replace BZT52C43-E3-18 in a 43 V reference circuit?
No - BZT52C47-E3-18 has a nominal Zener voltage of 47 V (range 44.65–49.35 V), while BZT52C43-E3-18 is rated for 43 V (40.85–45.15 V). Substituting BZT52C47-E3-18 would raise the regulated voltage by ~4 V, potentially exceeding downstream component ratings. BZT52C47-E3-18 is not a drop-in replacement for BZT52C43-E3-18.
What is the reverse leakage current specification for BZT52C47-E3-18 at 35 V?
At VR = 35 V and Tamb = 25 °C, the reverse leakage current (IR) for BZT52C47-E3-18 is guaranteed ≤500 nA. This low leakage supports high-impedance bias networks and minimizes error in precision reference applications where shunt current must remain below 1 µA.
BZT52C47-E3-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZT52
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 410 mW
- Impedance (Max) (Zzt):
- 97 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 35 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
BZT52C47-E3-18 FAQ
1.How can I place an order for BZT52C47-E3-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52C47-E3-18 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 BZT52C47-E3-18 reliable?
The price and inventory of BZT52C47-E3-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52C47-E3-18 is usually 5 days.
3.What payment methods are accepted for BZT52C47-E3-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52C47-E3-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52C47-E3-18?
BZT52C47-E3-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52C47-E3-18 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 BZT52C47-E3-18?
For technical support, including BZT52C47-E3-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52C47-E3-18 requirements.
6.How does Aetrix verify that BZT52C47-E3-18 is sourced from the original manufacturer or authorized distributors?
All BZT52C47-E3-18 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 BZT52C47-E3-18 meets industry standards.
7.What is the process for return or replacement of BZT52C47-E3-18?
All BZT52C47-E3-18 units undergo pre-shipment inspection (PSI). If there is an issue with BZT52C47-E3-18, 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 BZT52C47-E3-18 part is unused and in its original packaging.
Return procedure for BZT52C47-E3-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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