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onsemi BZX55C47_T50A
- Part No.:
- BZX55C47_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C47_T50A.pdf
- Description:
- DIODE ZENER 47V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,307
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Product details
Overview
BZX55C47_T50A from Fairchild Semiconductor is a 47 V ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 110 Ω dynamic impedance at 2.5 mA test current and 0.1 μA reverse leakage at 35 V. It provides precise voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX55C47_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, dynamic impedance at nominal test current, reverse leakage at rated VR, and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
The BZX55C47_T50A operates as a two-terminal voltage reference device relying on controlled reverse-biased avalanche breakdown. Its 47 V nominal zener voltage is specified at 2.5 mA test current (IZ), with guaranteed min/max bounds of 44 V and 50 V under standard thermal conditions.
It exhibits 110 Ω dynamic impedance (ZZ) at IZ = 2.5 mA and maintains ≤0.1 μA reverse leakage current (IR) at VR = 35 V - critical for stable biasing in high-impedance feedback networks and overvoltage clamp response time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44–50 V at IZ = 2.5 mA; defines regulated output voltage range under nominal bias |
| Power Dissipation (PD) | 500 mW at TL ≤ 75°C; sets maximum continuous thermal load before derating begins |
| Dynamic Impedance (ZZ) | 110 Ω at IZ = 2.5 mA; determines regulation sensitivity to current variation |
| Reverse Leakage (IR) | ≤0.1 μA at VR = 35 V; ensures minimal error current in high-Z reference nodes |
| Tolerance | ±5%; guarantees voltage accuracy without post-manufacturing trimming |
| Package | DO-35 glass case with cathode band; supports manual or wave soldering, IPC Class 2 reliability |
Pinout & Package
DO-35 glass axial package: hermetically sealed, 2.0 mm diameter × 5.2 mm length, cathode identified by single color band. Two terminals only: anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit common when used in shunt regulator configuration |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input supply via series resistor; delivers stable 47 V reference |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables direct use in precision references without external calibration |
| 500 mW power rating | Supports robust operation in 5–10 mA shunt regulator designs with margin |
| 110 Ω dynamic impedance | Minimizes output voltage shift under ±1 mA load current variation |
| 0.1 μA IR at 35 V | Preserves accuracy in high-resistance divider networks (e.g., >1 MΩ) |
Applications
| Voltage Reference for Op-Amp Circuits | Overvoltage Clamp in Sensor Interfaces |
|---|---|
Use Scenario: Providing stable 47 V bias to op-amp non-inverting inputs in industrial signal conditioning modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed DC operating point for amplifier stages. Use Value: Maintains <±0.5% offset drift over temperature due to tight 5% VZ tolerance and low ZZ. | Use Scenario: Protecting 3.3 V/5 V ADC inputs from transient surges in automotive cabin sensors. IC Role / Device Role / Timing Role: Passive clamping element diverting excess energy above 47 V to ground. Use Value: Limits peak voltage to safe levels while drawing <0.1 μA standby current during normal operation. |
| Low-Power Power Supply Regulation | ESD Protection in Legacy Communication Ports |
Use Scenario: Regulating auxiliary 47 V rail in battery-powered test equipment with ultra-low quiescent current. IC Role / Device Role / Timing Role: Two-terminal shunt regulator replacing linear regulators where efficiency >85% is not required. Use Value: Delivers stable output with only 2.5 mA minimum bias current and no control IC overhead. | Use Scenario: Supplementing TVS arrays on RS-232 transceiver lines exposed to contact discharge per IEC 61000-4-2 Level 3. IC Role / Device Role / Timing Role: Secondary clamping stage absorbing residual energy after primary TVS conduction. Use Value: Adds 47 V standoff capability with sub-microamp leakage, preserving signal integrity at 115.2 kbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4753A | Same 47 V nominal, ±5% tolerance, but 1.0 W power rating in DO-41 package | Requires larger PCB footprint; suitable for higher-current shunt regulation | Select when >500 mW dissipation or improved thermal margin is needed |
| MMSZ47ET1G | 47 V, ±5%, SOD-123 surface-mount package, 500 mW rating, 100 Ω ZZ at 2.5 mA | No through-hole mounting; optimized for automated assembly and space-constrained boards | Select for modern high-density PCBs where DO-35 is incompatible with layout constraints |
Compared with 1N4753A and MMSZ47ET1G, the BZX55C47_T50A offers identical voltage specification and power rating in a legacy DO-35 through-hole form factor - ideal for repair, prototyping, and applications requiring manual assembly or high-voltage creepage clearance.
Availability
BZX55C47_T50A is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection, low-power regulation, and ESD supplemental clamping requiring stable component supply across extended production cycles.
Supply support for BZX55C47_T50A 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The BZX55C series was developed as a general-purpose, cost-optimized Zener diode family for industrial and consumer voltage reference and protection applications, emphasizing consistency, reliability, and broad voltage coverage.
FAQ
What is the nominal zener voltage and tolerance of the BZX55C47_T50A?
The BZX55C47_T50A has a nominal zener voltage of 47 V with a guaranteed tolerance of ±5%, meaning the actual VZ falls between 44 V and 50 V when measured at 2.5 mA test current and 25°C ambient. This tolerance is factory-trimmed and does not require external adjustment. The BZX55C47_T50A maintains this specification across its qualified operating temperature range.
What is the maximum power dissipation rating for the BZX55C47_T50A?
The BZX55C47_T50A is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C with 3/8" lead length. Above 75°C, it derates linearly at 4.0 mW/°C. This rating defines the upper thermal limit for continuous DC operation in shunt regulator or clamp configurations. The BZX55C47_T50A must be mounted with appropriate thermal relief to avoid exceeding junction temperature limits.
What is the dynamic impedance of the BZX55C47_T50A and why does it matter?
The BZX55C47_T50A has a dynamic impedance (ZZ) of 110 Ω measured at IZ = 2.5 mA. This parameter quantifies how much the zener voltage changes in response to small variations in current - lower ZZ yields tighter regulation. In practice, the BZX55C47_T50A's 110 Ω value ensures voltage stability within ±0.1 V for ±1 mA current shifts, making it suitable for medium-precision references.
How is the cathode identified on the BZX55C47_T50A package?
The cathode of the BZX55C47_T50A is marked by a single color band on the DO-35 glass body, consistent with industry-standard polarity marking. This band aligns with the cathode terminal, which serves as the regulated output node in shunt configurations. Correct orientation is essential: reverse connection prevents proper zener operation. The BZX55C47_T50A's marking follows Fairchild's top-marking convention with "5C" and "47" on separate lines.
What is the reverse leakage current specification for the BZX55C47_T50A?
The BZX55C47_T50A specifies a maximum reverse leakage current (IR) of 0.1 μA at VR = 35 V and 25°C. This low leakage ensures minimal error contribution in high-impedance reference dividers and preserves accuracy in battery-powered systems. At elevated temperatures (e.g., 125°C), IR increases but remains below 1.0 μA - a value confirmed in the official Fairchild datasheet for the BZX55C47_T50A.
BZX55C47_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±6%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 110 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 35 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX55C47_T50A FAQ
1.How can I place an order for BZX55C47_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C47_T50A 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 BZX55C47_T50A reliable?
The price and inventory of BZX55C47_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C47_T50A is usually 5 days.
3.What payment methods are accepted for BZX55C47_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C47_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C47_T50A?
BZX55C47_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C47_T50A 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 BZX55C47_T50A?
For technical support, including BZX55C47_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C47_T50A requirements.
6.How does Aetrix verify that BZX55C47_T50A is sourced from the original manufacturer or authorized distributors?
All BZX55C47_T50A 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 BZX55C47_T50A meets industry standards.
7.What is the process for return or replacement of BZX55C47_T50A?
All BZX55C47_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C47_T50A, 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 BZX55C47_T50A part is unused and in its original packaging.
Return procedure for BZX55C47_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX55C47_T50A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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