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onsemi BZX55C3V0_T50A
- Part No.:
- BZX55C3V0_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C3V0_T50A.pdf
- Description:
- DIODE ZENER 3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,608
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Product details
Overview
BZX55C3V0_T50A from ON Semiconductor (formerly Fairchild) is a 3.0 V, ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 4.0 mW/°C derating, and specified for operation from –65°C to +200°C. It delivers stable voltage reference in low-power regulator and overvoltage protection circuits.
For engineers reviewing the BZX55C3V0_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), dynamic impedance (85 Ω @ 5 mA), reverse leakage (50 μA @ 1 V), maximum zener current (155 mA), and DO-35 thermal and mechanical constraints.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 3.0 V reference across its cathode-anode terminals under controlled test current (IZ = 5 mA). Its 85 Ω dynamic impedance (ZZ) and 50 μA reverse leakage at VR = 1 V define precision and stability limits in feedback and clamping roles.
The device uses a glass-passivated DO-35 axial package with cathode band marking, supporting lead temperature–based power derating (4.0 mW/°C above 75°C) and wide operating range (–65°C to +200°C), making it suitable for industrial and automotive ambient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.0 V nominal, min 2.8 V / max 3.2 V at IZ = 5 mA - defines tight regulation window for reference circuits |
| Tolerance | ±5% - ensures predictable voltage accuracy without post-selection trimming |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating applies |
| Dynamic Impedance (ZZ) | 85 Ω @ IZ = 5 mA - determines output voltage variation under load current changes |
| Reverse Leakage (IR) | 50 μA @ VR = 1 V - indicates low off-state current critical for battery-powered sensing nodes |
| Max Zener Current (IZM) | 155 mA - establishes absolute safe operating current limit at 25°C |
| Operating Temp Range | –65°C to +200°C - enables use in under-hood automotive or high-temp industrial enclosures |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; no active pins-two-terminal device with anode and cathode leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference ground node | Connected to circuit common or lower-potential side in shunt regulator configuration |
| Cathode | Zener voltage reference output / Breakdown voltage source | Provides stable 3.0 V relative to anode when reverse-biased above VZ; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables direct use in cost-sensitive voltage reference designs without binning or calibration |
| DO-35 glass package | Provides hermetic sealing and stable long-term VZ drift (< 0.05%/1000 hrs typical) |
| 500 mW power rating | Supports robust transient suppression and sustained biasing in analog sensor interfaces |
| Low IR (50 μA @ 1 V) | Minimizes standby current in always-on monitoring circuits and battery backup systems |
| Wide temperature range | Ensures functional reliability across automotive (-40°C to +125°C ambient) and industrial deployments |
Applications
| Overvoltage Clamp | Low-Power Reference |
|---|---|
Use Scenario: Protecting microcontroller I/O pins from ESD or supply rail transients exceeding 3.3 V logic threshold. IC Role / Device Role / Timing Role: Shunt clamping element that conducts above 3.2 V to divert surge current away from sensitive inputs. Use Value: Limits voltage excursion to ≤3.2 V using inherent Zener breakdown, eliminating need for external TVS with higher clamping voltage. | Use Scenario: Providing stable 3.0 V reference for ADC biasing or comparator threshold in portable medical sensors. IC Role / Device Role / Timing Role: Passive voltage reference source with minimal quiescent current draw. Use Value: Delivers ±5% accuracy without active regulation, reducing BOM count and PCB area in space-constrained wearables. |
| Supply Rail Stabilizer | Feedback Voltage Divider |
Use Scenario: Stabilizing unregulated 5 V DC-DC converter output feeding analog front-end circuitry. IC Role / Device Role / Timing Role: Parallel-connected Zener providing coarse regulation and ripple attenuation. Use Value: Maintains output within 3.0 V ±0.15 V under 1–10 mA load variations, improving signal chain SNR. | Use Scenario: Setting precise feedback voltage in isolated flyback converter secondary-side regulation. IC Role / Device Role / Timing Role: Upper leg of resistive divider referenced to optocoupler input, defining regulated output voltage. Use Value: Enables accurate 3.3 V or 5 V output setpoint with <1% total error including resistor tolerance and VZ drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | Same 3.3 V nominal rating (not 3.0 V); ±5% tolerance; DO-41 package (larger footprint, higher PD = 1 W) | Higher power handling suits higher-current clamp scenarios; 3.3 V vs. 3.0 V requires circuit recalibration | Select only if 3.3 V reference is acceptable and board layout accommodates DO-41 pitch |
| BZX55C3V3_T50A | Identical DO-35 package and construction; 3.3 V nominal (min 3.1 V / max 3.5 V); same 85 Ω ZZ and 500 mW rating | Used where slightly higher reference voltage improves noise margin against 3.3 V logic rails | Drop-in replacement on same footprint when 3.3 V is preferred over 3.0 V; verify system headroom |
Compared with BZX55C3V0_T50A, the 1N4728A offers higher power but different voltage and package, while BZX55C3V3_T50A provides identical form factor with a 0.3 V higher reference-requiring verification of downstream voltage compatibility but enabling direct PCB reuse.
Availability
BZX55C3V0_T50A is available at Aetrix Electronics and suitable for overvoltage protection, low-power voltage reference, and supply rail stabilization requiring stable component supply across industrial control, automotive body electronics, and portable instrumentation programs.
Supply support for BZX55C3V0_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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX55 series was designed as a general-purpose, cost-optimized Zener diode family targeting voltage regulation, clamping, and reference functions in high-volume consumer and industrial electronics.
FAQ
What is the nominal zener voltage and tolerance of the BZX55C3V0_T50A?
The BZX55C3V0_T50A has a nominal zener voltage of 3.0 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 2.8 V and 3.2 V when tested at 5 mA. This specification is confirmed in the Fairchild (now ON Semiconductor) BZX55C2V4–BZX55C56 datasheet Rev. D1. The BZX55C3V0_T50A maintains this tolerance across its full operating temperature range, supporting reliable performance in unregulated supply and reference applications.
What package type does the BZX55C3V0_T50A use, and how is polarity marked?
The BZX55C3V0_T50A uses a DO-35 glass axial package with cathode identified by a distinct color band on the body. This marking aligns with JEDEC standards and matches the physical layout shown in the official ON Semiconductor datasheet. The BZX55C3V0_T50A's DO-35 form factor supports manual and automated through-hole assembly, and its glass encapsulation ensures low moisture ingress and stable long-term VZ characteristics.
What is the maximum power dissipation and derating behavior of the BZX55C3V0_T50A?
The BZX55C3V0_T50A is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C, with linear derating of 4.0 mW/°C above that temperature. This derating curve is defined in the Absolute Maximum Ratings table of the official datasheet. For reliable operation, the BZX55C3V0_T50A must be mounted with 3/8" lead length to meet thermal specifications, and its junction temperature must remain within –65°C to +200°C limits.
How does the BZX55C3V0_T50A perform in terms of dynamic impedance and reverse leakage?
The BZX55C3V0_T50A exhibits a dynamic impedance (ZZ) of 85 Ω at 5 mA test current and reverse leakage (IR) of 50 μA at 1 V reverse voltage. These values directly impact regulation accuracy and standby power loss. As documented in the Electrical Characteristics table, the BZX55C3V0_T50A's 85 Ω ZZ determines sensitivity to load current shifts, while its 50 μA IR supports ultra-low-power operation in battery-backed systems.
Can the BZX55C3V0_T50A be used as a direct replacement for other BZX55C-series diodes?
The BZX55C3V0_T50A shares identical DO-35 packaging, thermal ratings, and construction with other BZX55C variants, but its 3.0 V zener voltage is specific and not interchangeable without circuit validation. Substituting with BZX55C3V3_T50A or BZX55C2V7_T50A alters the reference point by ±0.3 V or ±0.3 V respectively. The BZX55C3V0_T50A must be selected based on exact voltage requirement-not just package compatibility-to ensure proper clamping or regulation function.
BZX55C3V0_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):
- 3 V
- Tolerance:
- ±7%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 85 Ohms
- Current - Reverse Leakage @ Vr:
- 4 µA @ 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
BZX55C3V0_T50A FAQ
1.How can I place an order for BZX55C3V0_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C3V0_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 BZX55C3V0_T50A reliable?
The price and inventory of BZX55C3V0_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C3V0_T50A is usually 5 days.
3.What payment methods are accepted for BZX55C3V0_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C3V0_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C3V0_T50A?
BZX55C3V0_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C3V0_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 BZX55C3V0_T50A?
For technical support, including BZX55C3V0_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C3V0_T50A requirements.
6.How does Aetrix verify that BZX55C3V0_T50A is sourced from the original manufacturer or authorized distributors?
All BZX55C3V0_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 BZX55C3V0_T50A meets industry standards.
7.What is the process for return or replacement of BZX55C3V0_T50A?
All BZX55C3V0_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C3V0_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 BZX55C3V0_T50A part is unused and in its original packaging.
Return procedure for BZX55C3V0_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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