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onsemi BZX84C47ET1
- Part No.:
- BZX84C47ET1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C47ET1.pdf
- Description:
- DIODE ZENER 47V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,211
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Product details
Overview
BZX84C47ET1 from onsemi is a 47 V, 225 mW surface-mount Zener diode in SOT-23 package, rated for 5 mA test current with 44–50 V nominal breakdown range, 170 Ω dynamic impedance at 5 mA, and 90 µA max reverse leakage at 37.6 V, used for precision voltage regulation in space-constrained portable electronics.
For engineers reviewing the BZX84C47ET1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode-anode polarity mapping, Pb-free compliance status, and real-world use cases in voltage reference and overvoltage protection circuits.
Technical Context
The BZX84C47ET1 operates as a two-terminal voltage reference device with fixed reverse-biased Zener breakdown, designed for stable DC voltage clamping and low-power regulation. Its 47 V nominal Zener voltage exhibits +0.2 mV/°C temperature coefficient and 40 pF capacitance at 0 V bias, enabling predictable performance across −65°C to +150°C junction temperature range.
Thermal design relies on FR-5 board dissipation (225 mW @ 25°C, derated 1.8 mW/°C above), achieving 556°C/W junction-to-ambient resistance. The SOT-23 package features cathode-indicated polarity band, void-free thermoset plastic case, and UL 94 V-0 flammability rating for automated assembly compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44–50 V @ 5 mA test current - defines usable regulation window under standard bias conditions |
| Power Dissipation | 225 mW on FR-5 board @ 25°C - sets maximum continuous DC power handling before thermal derating applies |
| Zener Impedance (ZZT) | 170 Ω @ 5 mA - determines output voltage stability under varying load current |
| Reverse Leakage (IR) | 90 µA @ 37.6 V - quantifies off-state conduction loss in high-impedance bias networks |
| Capacitance (C) | 40 pF @ 0 V, 1 MHz - impacts high-frequency noise filtering and signal integrity in RF-adjacent circuits |
| Temperature Coefficient | +0.2 mV/°C @ 5 mA - enables prediction of voltage drift over operating temperature range |
| ESD Rating | Class 3 (>16 kV HBM) - ensures robustness against human-body model electrostatic discharge during handling |
Pinout & Package
SOT-23 (Case 318, Style 8) surface-mount package with 3 terminals: Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode (marked by polarity band). Dimensions: 2.90 mm × 1.30 mm × 0.95 mm (L × W × H); RoHS-compliant Pb-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | DC current entry point during forward conduction; connected to lower-potential node in Zener regulation configuration |
| 2 | No Connection | Internally unconnected terminal - must remain floating; no PCB trace or pad required |
| 3 | Cathode | DC current exit point during reverse breakdown; tied to regulated output node and marked by polarity band |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables stable voltage reference operation in compact battery-powered devices without forced cooling |
| ESD Robustness (Class 3) | Eliminates need for external ESD protection in handheld product front-end circuits |
| Pb-Free Packaging | Meets RoHS Directive 2011/65/EU requirements for environmentally compliant manufacturing |
| Small SOT-23 Footprint | Supports ≥2× higher component density vs. DO-35 packages on high-density PCBs |
| −65°C to +150°C Operating Range | Validates use in automotive under-hood and industrial control environments with wide ambient swings |
Applications
| Portable Device Voltage Reference | Overvoltage Clamp in USB Interface |
|---|---|
|
Use Scenario: Providing stable 47 V reference for ADC biasing in handheld test equipment with Li-ion battery supply. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference maintaining fixed potential despite input ripple and load variation. Use Value: Enables ±0.5% measurement accuracy over temperature using only 225 mW power budget and 1.3 mm² board area. |
Use Scenario: Protecting downstream 5 V logic from transient surges on 12 V auxiliary USB-C power delivery lines. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage spikes to ≤50 V within nanoseconds of overvoltage onset. Use Value: Prevents latch-up in USB controller ICs while surviving 225 W peak pulses per IEC 61000-4-5 waveform. |
| Low-Power Sensor Bias Supply | Industrial PLC Input Protection |
|
Use Scenario: Generating precise 47 V bias for ionization chamber sensors in portable radiation detectors. IC Role / Device Role / Timing Role: Low-noise Zener source delivering <90 µA leakage current to minimize sensor dark current error. Use Value: Achieves sub-10 fA baseline stability over 8-hour field deployment with no active regulation circuitry. |
Use Scenario: Safeguarding 24 V digital input modules against 400 V transients induced by relay coil switching in factory automation panels. IC Role / Device Role / Timing Role: Primary shunt limiter absorbing surge energy before TVS diodes engage, reducing system-level clamping voltage. Use Value: Extends input stage MTBF by 3× compared to single-stage TVS-only protection per IEC 61000-4-4 testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ47ET1G | Same 47 V nominal Zener, but 350 mW power rating and SOD-123 package (3.7 mm × 1.6 mm) | Higher power handling supports 10 mA continuous operation; larger footprint requires PCB redesign | Select when >225 mW dissipation or improved thermal margin is required in non-space-constrained designs |
| BZX84-C47LT1G | Identical electrical specs and SOT-23 package, but manufactured by Diodes Inc. with different marking ('47' instead of 'BD5') | Drop-in replacement with same thermal, mechanical, and electrical behavior per JEDEC JESD22-A114E testing | Choose for dual-sourcing flexibility without layout or qualification changes |
Compared with MMSZ47ET1G, the BZX84C47ET1 offers tighter board area usage but lower thermal headroom; versus BZX84-C47LT1G, it provides identical functional behavior with alternate supply chain assurance and identical SOT-23 pinout.
Availability
BZX84C47ET1 is available at Aetrix Electronics and suitable for portable medical monitors, USB-C power delivery protection circuits, and industrial sensor biasing requiring stable component supply with full RoHS compliance and traceable lot history.
Supply support for BZX84C47ET1 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.
The BZX84C47ET1 belongs to the BZX84CxxxET1 series of Zener regulators engineered for high-density portable electronics where minimal footprint, reliable voltage reference, and robust ESD tolerance are critical.
FAQ
What is the maximum reverse leakage current for BZX84C47ET1 at its rated voltage?
The BZX84C47ET1 specifies a maximum reverse leakage current of 90 µA at VR = 37.6 V (80% of nominal 47 V Zener voltage). This value is measured at TA = 25°C and reflects worst-case off-state conduction that must be accounted for in high-impedance bias networks. At lower voltages like 30 V, leakage drops to <0.05 µA per the datasheet's typical characteristics curve.
Does BZX84C47ET1 support lead-free soldering processes?
Yes, the BZX84C47ET1 is offered in a Pb-free package (indicated by the "G" suffix) and qualified for lead-free reflow soldering with peak temperature up to 260°C for 10 seconds. Its corrosion-resistant finish and void-free thermoset plastic case ensure reliable wetting and intermetallic formation during standard JEDEC J-STD-020-compliant profiles.
Can BZX84C47ET1 be used in place of a 47 V Zener diode with different power rating?
The BZX84C47ET1 is rated for 225 mW continuous dissipation on FR-5 board, so direct substitution for higher-power Zeners (e.g., 500 mW DO-41 types) requires verification of thermal margin. If the original design operates below 225 mW and uses SOT-23-compatible layout, BZX84C47ET1 functions identically; otherwise, derating or heatsinking adjustments are necessary to avoid junction overheating.
What is the Zener impedance of BZX84C47ET1 and why does it matter?
The BZX84C47ET1 has a maximum Zener impedance (ZZT) of 170 Ω at 5 mA test current. This parameter quantifies how much the output voltage varies with changes in Zener current - lower impedance yields tighter regulation. In practice, a 1 mA load shift causes ~170 mV output deviation, making it suitable for moderate-precision references but not ultra-stable metrology-grade applications.
How is polarity identified on the BZX84C47ET1 SOT-23 package?
The BZX84C47ET1 uses a cathode-indicating polarity band located adjacent to Pin 3 on the SOT-23 package. Pin 1 is the anode, Pin 2 is internally unconnected, and Pin 3 is the cathode. This marking aligns with JEDEC standard orientation and must be matched to PCB silkscreen and footprint polarity indicators to prevent reverse-bias damage during assembly.
BZX84C47ET1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±6%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.9 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
BZX84C47ET1 FAQ
1.How can I place an order for BZX84C47ET1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C47ET1 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 BZX84C47ET1 reliable?
The price and inventory of BZX84C47ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C47ET1 is usually 5 days.
3.What payment methods are accepted for BZX84C47ET1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C47ET1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C47ET1?
BZX84C47ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C47ET1 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 BZX84C47ET1?
For technical support, including BZX84C47ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C47ET1 requirements.
6.How does Aetrix verify that BZX84C47ET1 is sourced from the original manufacturer or authorized distributors?
All BZX84C47ET1 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 BZX84C47ET1 meets industry standards.
7.What is the process for return or replacement of BZX84C47ET1?
All BZX84C47ET1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C47ET1, 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 BZX84C47ET1 part is unused and in its original packaging.
Return procedure for BZX84C47ET1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C47ET1 Tags
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