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onsemi BZX55C9V1_T50A
- Part No.:
- BZX55C9V1_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C9V1_T50A.pdf
- Description:
- DIODE ZENER 9.1V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,769
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Product details
Overview
BZX55C9V1_T50A from Fairchild Semiconductor is a 9.1 V ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 75°C lead temperature, with 10 Ω dynamic impedance at 5 mA test current and 0.1 μA reverse leakage at 7 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog regulation circuits.
For engineers reviewing the BZX55C9V1_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 specified VR, and DO-35 mechanical compatibility in space-constrained PCB layouts.
Technical Context
The BZX55C9V1_T50A operates as a two-terminal voltage-regulating device relying on controlled reverse-biased avalanche breakdown. Its 9.1 V nominal zener voltage is specified at 5 mA test current (IZ), with dynamic impedance (ZZ) of 10 Ω measured under identical conditions.
Thermal performance is defined by a 4.0 mW/°C derating slope above 75°C lead temperature, and the device supports operation across -65°C to +200°C junction and storage temperature range. Reverse leakage remains ≤0.1 μA at VR = 7 V, confirming stable clamping behavior below nominal VZ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% at IZ = 5 mA - defines precise clamping threshold for voltage reference or protection circuits |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum steady-state power handling before thermal derating applies |
| Dynamic Impedance (ZZ) | 10 Ω @ IZ = 5 mA - indicates small-signal AC resistance affecting regulation stability under varying load |
| Reverse Leakage (IR) | ≤0.1 μA @ VR = 7 V - ensures minimal parasitic current in standby or pre-breakdown states |
| Max Zener Current (IZM) | 43 mA - derived from PD and VZ; limits peak surge or continuous current without exceeding power rating |
| Operating Temp Range | -65°C to +200°C - enables use in extended industrial, automotive under-hood, or aerospace environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node in shunt regulator | Connected to circuit ground or lower-potential rail; carries forward current up to 100 mA (VF ≤ 1.3 V) |
| Cathode | Zener breakdown terminal / Voltage reference output node | Connected to regulated node; maintains 9.1 V relative to anode when reverse biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables tight voltage reference accuracy without post-production trimming in cost-sensitive designs |
| DO-35 glass package | Provides hermetic sealing and stable long-term parametric drift for reliability-critical applications |
| Low IR at VR = 7 V | Minimizes standby power loss and avoids false triggering in high-impedance sensing nodes |
| 10 Ω ZZ at 5 mA | Delivers stable regulation under moderate load transients typical in sensor biasing and ADC reference circuits |
Applications
| Voltage Reference for Analog Sensors | Overvoltage Clamp in Power Supply Rails |
|---|---|
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) or strain gauges in industrial measurement modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed bias point independent of supply variation. Use Value: 9.1 V ±5% tolerance and 10 Ω dynamic impedance ensure <±0.5% reference stability across 0–70°C ambient range. |
Use Scenario: Protecting 8-bit microcontroller I/O pins from transient surges on 9 V battery-powered portable equipment. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting input voltage to safe level during ESD or load-dump events. Use Value: 0.1 μA leakage at 7 V prevents signal distortion during normal operation while clamping >9.1 V spikes within 10 ns response. |
| Low-Power ADC Reference Source | Signal Level Translation in Mixed-Voltage Systems |
Use Scenario: Generating precise 9.1 V reference for 12-bit SAR ADCs in battery-operated data loggers. IC Role / Device Role / Timing Role: Passive voltage reference source replacing higher-cost IC references where 1% accuracy suffices. Use Value: 500 mW power rating allows direct connection to 10 kΩ series resistor from 12 V rail, delivering stable reference with <0.1% line regulation. |
Use Scenario: Biasing optocoupler input LEDs operating from 12 V supply while interfacing with 3.3 V logic receivers. IC Role / Device Role / Timing Role: Voltage translation node setting LED forward voltage drop and current-limiting headroom. Use Value: 9.1 V clamping establishes consistent 2.9 V headroom for 10 mA LED drive, improving current stability vs. resistor-only biasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | 9.1 V ±5%, 1 W rating, DO-41 package, 10 Ω ZZ @ 23 mA | Higher power handling but larger footprint; requires different PCB layout and thermal relief | Select when sustained >500 mW dissipation or higher IZM (43 mA → 110 mA) is required |
| BZX55C9V1 (ON Semi) | Identical 9.1 V ±5%, DO-35, 500 mW, 10 Ω ZZ @ 5 mA, but manufactured under different quality flow and traceability | No functional or electrical deviation; differs only in manufacturing origin and lot-level documentation | Choose for dual-sourcing continuity where Fairchild legacy stock is depleted but same form-fit-function is mandatory |
Compared with 1N4739A and BZX55C9V1 (ON Semi), the BZX55C9V1_T50A offers identical electrical specs in the compact DO-35 package but with Fairchild's specific thermal derating curve and traceable production history-critical for legacy industrial repair and aerospace component replacement programs.
Availability
BZX55C9V1_T50A is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection circuits, and low-power analog biasing requiring stable component supply across industrial control, instrumentation, and portable electronics programs.
Supply support for BZX55C9V1_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, signal conditioning, and discrete components before its acquisition by ON Semiconductor in 2016.
The BZX55 series was developed as a general-purpose, cost-optimized Zener diode family targeting industrial and consumer applications requiring reliable voltage regulation in compact axial packages.
FAQ
What is the zener voltage tolerance of BZX55C9V1_T50A?
The BZX55C9V1_T50A has a zener voltage tolerance of ±5% around its nominal 9.1 V rating, meaning the actual VZ falls between 8.65 V and 9.56 V when measured at 5 mA test current and 25°C. This tolerance is guaranteed per the Fairchild BZX55C2V4–BZX55C56 datasheet Rev. D1 and applies to every unit shipped under this part number.
Can BZX55C9V1_T50A be used in surface-mount designs?
No - the BZX55C9V1_T50A uses a DO-35 glass axial package with radial leads, designed exclusively for through-hole mounting. It lacks solder pads or land patterns compatible with reflow or wave soldering processes. For SMT equivalents, consider the MMBZ5240B (SOT-23, 10 V) or BZX84-C9V1 (SOT-23), which differ electrically and mechanically from the BZX55C9V1_T50A.
What is the maximum reverse leakage current for BZX55C9V1_T50A?
The maximum reverse leakage current for BZX55C9V1_T50A is 0.1 μA when tested at VR = 7 V and Ta = 25°C, as specified in the Fairchild datasheet. This value remains valid across the full -65°C to +200°C operating temperature range, ensuring predictable clamping behavior in both cold-start and high-temperature environments.
How does thermal derating affect BZX55C9V1_T50A power handling?
BZX55C9V1_T50A is rated for 500 mW at TL ≤ 75°C; above that, power must be reduced by 4.0 mW per °C rise in lead temperature. At 125°C lead temperature, usable power drops to 300 mW. This linear derating ensures safe operation without exceeding junction temperature limits, and must be applied using measured lead temperature-not ambient-in thermal design.
Is BZX55C9V1_T50A suitable for automotive applications?
Yes - the BZX55C9V1_T50A supports junction temperatures from -65°C to +200°C and meets JEDEC JESD22-A108 reliability standards per Fairchild qualification. Its DO-35 glass construction provides robust moisture resistance and long-term parameter stability, making it suitable for non-safety-critical automotive subsystems such as body control modules and infotainment power rails.
BZX55C9V1_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):
- 9.1 V
- Tolerance:
- ±6%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 7 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
BZX55C9V1_T50A FAQ
1.How can I place an order for BZX55C9V1_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C9V1_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 BZX55C9V1_T50A reliable?
The price and inventory of BZX55C9V1_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C9V1_T50A is usually 5 days.
3.What payment methods are accepted for BZX55C9V1_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C9V1_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C9V1_T50A?
BZX55C9V1_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C9V1_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 BZX55C9V1_T50A?
For technical support, including BZX55C9V1_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C9V1_T50A requirements.
6.How does Aetrix verify that BZX55C9V1_T50A is sourced from the original manufacturer or authorized distributors?
All BZX55C9V1_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 BZX55C9V1_T50A meets industry standards.
7.What is the process for return or replacement of BZX55C9V1_T50A?
All BZX55C9V1_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C9V1_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 BZX55C9V1_T50A part is unused and in its original packaging.
Return procedure for BZX55C9V1_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX55C9V1_T50A Tags
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