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onsemi BZX55C30_T50R
- Part No.:
- BZX55C30_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C30_T50R.pdf
- Description:
- DIODE ZENER 30V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,511
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Product details
Overview
BZX55C30_T50R from Fairchild Semiconductor is a 30 V ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 80 Ω dynamic impedance at 5 mA test current and 22 mA maximum Zener current. It provides precise voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX55C30_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (28.0–32.0 V), tight 5% tolerance, DO-35 mechanical compatibility, and thermal derating behavior above 75°C.
Technical Context
The BZX55C30_T50R operates as a two-terminal voltage reference device relying on reverse-biased Zener breakdown. Its 30 V nominal rating targets mid-range regulation needs where higher-voltage stability is required without switching complexity.
It exhibits 80 Ω dynamic impedance (ZZ) at 5 mA test current and maintains leakage current ≤0.1 μA at 22 V reverse voltage, supporting stable biasing in precision analog circuits and overvoltage clamping in signal conditioning paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28.0–32.0 V at IZ = 5 mA - defines regulated output range under nominal bias |
| Tolerance | ±5% - ensures predictable voltage accuracy across production lots |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous thermal load in lead-mounted configuration |
| Dynamic Impedance (ZZ) | 80 Ω @ IZ = 5 mA - determines regulation stiffness against load current variation |
| Max Zener Current (IZM) | 22 mA - limits peak reverse conduction before thermal runaway risk |
| Reverse Leakage (IR) | ≤0.1 μA @ VR = 22 V - guarantees minimal error current in high-impedance reference nodes |
| Operating Temp Range | −65°C to +200°C - supports deployment in extended industrial and automotive under-hood environments |
Pinout & Package
DO-35 glass axial package with cathode band marking; two-terminal device requiring no external bias control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit common or lower-potential node during regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 30 V reference when reverse biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables consistent reference accuracy without post-manufacture trimming in cost-sensitive designs |
| DO-35 glass package | Offers hermetic sealing and proven reliability for long-term voltage reference stability |
| 500 mW power rating | Supports direct regulation of small-signal ICs and microcontroller reset circuits without heatsinking |
| Low 0.1 μA leakage at 22 V | Minimizes error in high-impedance voltage divider networks and sensor biasing applications |
| −65°C to +200°C operating range | Permits use in harsh-environment industrial controls and automotive subsystems |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Providing stable 30 V reference for linear regulator feedback or ADC reference buffer. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference element. Use Value: Delivers ±5% accuracy without active components, reducing BOM count and layout area. | Use Scenario: Clamping transient surges on 24 V industrial I/O lines to prevent downstream damage. IC Role / Device Role / Timing Role: Reverse-biased shunt protection device. Use Value: Activates at 28–32 V to divert excess energy before system-level failure occurs. |
| Sensor Biasing Network | Microcontroller Reset Circuit |
Use Scenario: Supplying stable excitation voltage to resistive temperature detectors (RTDs) in process instrumentation. IC Role / Device Role / Timing Role: Precision DC bias source. Use Value: Low leakage (≤0.1 μA) prevents measurement drift in high-impedance bridge configurations. | Use Scenario: Generating clean, temperature-stable reset signal for 3.3 V or 5 V microcontrollers. IC Role / Device Role / Timing Role: Voltage threshold detector via RC timing network. Use Value: Tight 5% tolerance ensures deterministic reset assertion across temperature and supply variance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5256B | Same 30 V nominal, ±5% tolerance, but rated 500 mW in DO-35 with 30 Ω ZZ @ 5 mA | Lower dynamic impedance improves regulation under varying load, but requires verification of thermal margin in same PCB layout | Preferred where tighter regulation stiffness is critical and layout allows identical mounting |
| MMSZ5256ET1G | 30 V, ±5%, SOD-123 package, 500 mW, ZZ = 35 Ω @ 20 mA - surface-mount alternative | Requires rework of footprint and solder profile; not drop-in compatible due to package change | Select when transitioning to automated SMT assembly and board space is constrained |
Compared with BZX55C30_T50R, 1N5256B offers lower impedance for improved load regulation, while MMSZ5256ET1G enables miniaturized SMT implementation-neither is pin-compatible, but both serve equivalent voltage-reference functions in revised layouts.
Availability
BZX55C30_T50R is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and microcontroller reset circuits requiring stable component supply and long-lifecycle support.
Supply support for BZX55C30_T50R 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, signal conditioning, and discrete components before its acquisition by ON Semiconductor in 2016.
The BZX55 series was designed as a general-purpose, cost-optimized Zener diode family for voltage regulation and protection in industrial, consumer, and computing applications.
FAQ
What is the nominal Zener voltage of the BZX55C30_T50R?
The BZX55C30_T50R has a nominal Zener voltage of 30 V, with a guaranteed range of 28.0 V to 32.0 V at 5 mA test current and ±5% tolerance. This specification is measured under thermal equilibrium conditions at lead temperature of 30°C ± 1°C with 3/8" lead length, as defined in the Fairchild datasheet Rev. D1.
What package type does the BZX55C30_T50R use?
The BZX55C30_T50R uses the DO-35 glass axial package, identified by a cathode band marking and standardized for through-hole mounting. Its mechanical dimensions and lead configuration comply with JEDEC DO-35 specifications, enabling compatibility with legacy socketing and wave-soldering processes used for discrete diodes.
What is the maximum power dissipation rating for the BZX55C30_T50R?
The BZX55C30_T50R is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C with 3/8" lead length. Above 75°C, it must be derated at 4.0 mW/°C to maintain junction temperature within safe operating limits, per the Absolute Maximum Ratings table in the official Fairchild datasheet.
Does the BZX55C30_T50R have a specified forward voltage?
Yes-the BZX55C30_T50R has a maximum forward voltage (VF) of 1.3 V at forward current (IF) = 100 mA, as stated in the "VF Forward Voltage" note on page 2 of the Fairchild BZX55C2V4–BZX55C56 datasheet Rev. D1. This parameter applies only during forward conduction mode and is not relevant during Zener regulation operation.
What is the dynamic impedance of the BZX55C30_T50R and why does it matter?
The BZX55C30_T50R has a dynamic impedance (ZZ) of 80 Ω at 5 mA test current. This value quantifies how much the Zener voltage changes with small variations in current-lower ZZ means better regulation. At 80 Ω, the BZX55C30_T50R provides moderate regulation stiffness suitable for non-critical references where cost and simplicity outweigh ultra-low impedance requirements.
BZX55C30_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±7%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 22 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
BZX55C30_T50R FAQ
1.How can I place an order for BZX55C30_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C30_T50R 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 BZX55C30_T50R reliable?
The price and inventory of BZX55C30_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C30_T50R is usually 5 days.
3.What payment methods are accepted for BZX55C30_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C30_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C30_T50R?
BZX55C30_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C30_T50R 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 BZX55C30_T50R?
For technical support, including BZX55C30_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C30_T50R requirements.
6.How does Aetrix verify that BZX55C30_T50R is sourced from the original manufacturer or authorized distributors?
All BZX55C30_T50R 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 BZX55C30_T50R meets industry standards.
7.What is the process for return or replacement of BZX55C30_T50R?
All BZX55C30_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C30_T50R, 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 BZX55C30_T50R part is unused and in its original packaging.
Return procedure for BZX55C30_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX55C30_T50R Tags
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