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onsemi BZX55C4V7_T50A
- Part No.:
- BZX55C4V7_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C4V7_T50A.pdf
- Description:
- DIODE ZENER 4.7V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,380
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Product details
Overview
BZX55C4V7_T50A from Fairchild Semiconductor is a 4.7 V ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 75°C with 60 Ω dynamic impedance at 5 mA test current and 0.5 μA maximum reverse leakage at 3.7 V. It provides precise voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX55C4V7_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal derating behavior, junction temperature range (–65°C to +200°C), and compatibility with through-hole PCB layouts requiring DO-35 footprint.
Technical Context
This device operates as a two-terminal voltage reference by maintaining a stable reverse breakdown voltage across its anode–cathode terminals when biased above VZ. Its 4.7 V nominal zener voltage is specified at IZ = 5 mA with ±5% tolerance, and it exhibits 60 Ω dynamic impedance (ZZ) under those conditions.
The BZX55C4V7_T50A supports operation from –65°C to +200°C and follows standard DO-35 mechanical dimensions with cathode band marking. Power dissipation is limited to 500 mW at lead temperature ≤75°C, derating linearly at 4.0 mW/°C above that point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 4.4 V to 5.0 V at IZ = 5 mA - defines regulated output voltage range under nominal bias |
| Dynamic Impedance ZZ | 60 Ω max at IZ = 5 mA - determines voltage stability under load current variation |
| Power Dissipation PD | 500 mW @ TL ≤ 75°C - sets maximum continuous thermal limit for PCB-mounted operation |
| Reverse Leakage IR | 0.5 μA max @ VR = 3.7 V - ensures minimal quiescent current in standby regulation |
| Operating Temp Range | –65°C to +200°C - enables use in automotive under-hood, industrial, and high-reliability environments |
| Package | DO-35 glass axial - standard through-hole footprint with cathode band identification |
Pinout & Package
DO-35 glass axial package with cathode identified by a single color band on the body. Leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference return | Connected to circuit ground or lower-potential node in shunt regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input supply via series resistor; delivers stable 4.7 V reference |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable reference accuracy without post-production trimming |
| 500 mW power rating | Supports robust voltage clamping in transient suppression and feedback loops |
| DO-35 glass package | Provides hermetic sealing and long-term stability for high-reliability applications |
| Low 0.5 μA leakage at 3.7 V | Minimizes standby power loss in battery-backed or energy-sensitive designs |
Applications
| Voltage Reference for Op-Amp Circuits | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Providing stable 4.7 V bias to op-amp input stages in precision analog signal conditioning. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed DC offset or common-mode level. Use Value: Maintains 4.4–5.0 V regulation with <60 Ω impedance, minimizing drift-induced gain error in sensor front-ends. | Use Scenario: Clamping surge transients on 5 V logic rails during ESD or inductive switching events. IC Role / Device Role / Timing Role: Passive overvoltage clamp diverting excess current to ground before IC damage occurs. Use Value: Activates at 4.4 V minimum to protect downstream 5 V logic while limiting peak clamped voltage to 5.0 V. |
| Low-Power Microcontroller Reset Circuit | Current-Limited LED Bias Reference |
Use Scenario: Generating clean reset threshold for 5 V microcontrollers where supply dips below 4.4 V trigger reset. IC Role / Device Role / Timing Role: Zener-based threshold detector feeding RC network into MCU reset pin. Use Value: Tight 5% tolerance ensures consistent reset assertion across temperature and unit-to-unit variation. | Use Scenario: Setting constant forward current for indicator LEDs using simple resistor–zener bias network. IC Role / Device Role / Timing Role: Stable voltage reference enabling predictable LED current despite supply fluctuations. Use Value: Delivers 4.7 V reference with <0.5 μA leakage, improving current regulation accuracy vs. resistor-only bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4732A | Same 4.7 V nominal, ±5% tolerance, but rated 1.0 W and uses DO-41 package | Higher power handling suits higher-current clamping; larger DO-41 footprint requires layout change | Select when >500 mW dissipation or improved thermal margin is required |
| BZX55C4V7 (ON Semiconductor) | Identical electrical specs and DO-35 package; manufactured post-Fairchild acquisition | No functional or mechanical difference; direct second-source replacement | Preferred for new designs requiring active supply chain continuity |
Compared with 1N4732A and BZX55C4V7 (ON Semi), the BZX55C4V7_T50A offers identical regulation performance in the legacy Fairchild DO-35 form factor, making it optimal for repair, legacy system support, and space-constrained through-hole designs where 500 mW rating suffices.
Availability
BZX55C4V7_T50A is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and microcontroller reset circuits requiring stable component supply and long-lifecycle availability.
Supply support for BZX55C4V7_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 BZX55 series was developed as a general-purpose, low-power Zener diode family targeting cost-sensitive, high-volume applications in consumer, industrial, and computing systems.
FAQ
What is the zener voltage tolerance of BZX55C4V7_T50A?
The BZX55C4V7_T50A has a nominal zener voltage of 4.7 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 4.4 V and 5.0 V when tested at 5 mA. This tolerance is guaranteed across the full operating temperature range and is marked on the device as "4V7" in the third line of its DO-35 top marking. The BZX55C4V7_T50A maintains this specification per Fairchild's Rev. D1 datasheet.
What is the maximum power dissipation for BZX55C4V7_T50A?
The BZX55C4V7_T50A is rated for 500 mW maximum power dissipation at a lead temperature of 75°C, with linear derating of 4.0 mW/°C above that temperature. This rating assumes 3/8-inch lead length and applies to continuous DC operation. Exceeding this limit risks thermal runaway or permanent degradation. The BZX55C4V7_T50A must be mounted with adequate PCB copper area or airflow to maintain safe junction temperatures.
Does BZX55C4V7_T50A have a defined cathode marking?
Yes, the BZX55C4V7_T50A uses a single color band on the glass body to denote the cathode terminal, consistent with industry-standard DO-35 polarity marking. The cathode is the terminal adjacent to the band, and the anode is the opposite end. This marking is visible under standard visual inspection and aligns with JEDEC DO-35 mechanical drawings. The BZX55C4V7_T50A's cathode identification is critical for correct orientation in shunt regulator and clamp configurations.
What is the reverse leakage current specification for BZX55C4V7_T50A?
The BZX55C4V7_T50A specifies a maximum reverse leakage current (IR) of 0.5 μA at a reverse voltage (VR) of 3.7 V, measured at 25°C. This low leakage ensures minimal parasitic current draw in high-impedance reference nodes and battery-powered circuits. The BZX55C4V7_T50A maintains this value across its rated temperature range, supporting stable operation in precision analog and low-power applications.
Is BZX55C4V7_T50A compatible with lead-free soldering processes?
Yes, the BZX55C4V7_T50A's leads are tin-plated copper-clad steel and rated for standard lead-free reflow and wave soldering profiles, including peak temperatures up to 260°C for ≤10 seconds. Its DO-35 glass package is thermally robust and does not crack or delaminate under typical Pb-free thermal cycles. The BZX55C4V7_T50A complies with RoHS Directive 2011/65/EU and is suitable for modern manufacturing lines requiring lead-free compliance.
BZX55C4V7_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):
- 4.7 V
- Tolerance:
- ±6%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 60 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 1 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
BZX55C4V7_T50A FAQ
1.How can I place an order for BZX55C4V7_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C4V7_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 BZX55C4V7_T50A reliable?
The price and inventory of BZX55C4V7_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C4V7_T50A is usually 5 days.
3.What payment methods are accepted for BZX55C4V7_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C4V7_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C4V7_T50A?
BZX55C4V7_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C4V7_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 BZX55C4V7_T50A?
For technical support, including BZX55C4V7_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C4V7_T50A requirements.
6.How does Aetrix verify that BZX55C4V7_T50A is sourced from the original manufacturer or authorized distributors?
All BZX55C4V7_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 BZX55C4V7_T50A meets industry standards.
7.What is the process for return or replacement of BZX55C4V7_T50A?
All BZX55C4V7_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C4V7_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 BZX55C4V7_T50A part is unused and in its original packaging.
Return procedure for BZX55C4V7_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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