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onsemi BZX85C9V1
- Part No.:
- BZX85C9V1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C9V1.pdf
- Description:
- DIODE ZENER 9.1V 1.3W DO41G
- Quantity:
- Payment:
- Shipping:
Inventory:50,000
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Product details
Overview
BZX85C9V1 from Fairchild Semiconductor is a 9.1 V ±5% Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at 25°C, with 25 Ω zener impedance at 5 mA test current and 0.5 μA maximum leakage at 7.3 V reverse voltage. It provides stable voltage reference in low-power regulator and protection circuits.
For engineers reviewing the BZX85C9V1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical characteristics, thermal derating behavior, cathode identification, JEDEC DO-41 mechanical dimensions, and direct alternatives for overvoltage clamping and precision biasing designs.
Technical Context
The BZX85C9V1 operates as a silicon planar Zener diode with sharp reverse breakdown at nominal 9.1 V, specified under thermal equilibrium conditions (lead temperature TL = 30°C ±1°C, 3/8″ lead length). Its 25 Ω dynamic impedance at IZ = 5 mA ensures tight regulation across moderate load variations.
Designed for general-purpose voltage regulation and transient suppression, it features a glass-passivated DO-41 package with axial leads, cathode band marking, and -65°C to +200°C operating/storage range. Power derating begins at 50°C at 6.67 mW/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V nominal, ±5% tolerance - defines precise clamping threshold for reference or protection circuits |
| Power Dissipation (PD) | 1.0 W at TA = 25°C - sets maximum continuous DC power handling before thermal shutdown risk |
| Zener Impedance (ZZ) | 25 Ω at IZ = 5 mA - determines output voltage variation under changing load current |
| Leakage Current (IR) | 0.5 μA max at VR = 7.3 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Operating Temperature | -65°C to +200°C - supports deployment in automotive under-hood, industrial control, and aerospace environments |
| Forward Voltage (VF) | 1.2 V max at IF = 200 mA - enables use as low-drop rectifier or polarity indicator in dual-function circuits |
Pinout & Package
DO-41 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. Package conforms to JEDEC DO-204AL standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in reverse-biased configuration | Connected to ground or lower potential node when used as shunt regulator or clamp |
| Cathode | Zener breakdown terminal / high-side connection in reverse-biased configuration | Connected to input or protected node; voltage referenced to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable clamping without post-production trimming in cost-sensitive consumer and industrial designs |
| 1.0 W power rating | Supports robust transient energy absorption in 24 V system protection and analog supply rail stabilization |
| DO-41 glass package | Provides hermetic sealing and long-term reliability in humid or chemically aggressive environments |
| Low 0.5 μA leakage at 7.3 V | Minimizes standby current draw in battery-powered sensor nodes and low-power microcontroller reset circuits |
Applications
| Industrial Power Supply Monitoring | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Monitoring 12 V rail in PLC I/O modules to trigger brown-out detection before logic failure. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable threshold for comparator input. Use Value: 9.1 V Zener point aligns with common 12 V system undervoltage trip points while accommodating ±5% tolerance and thermal drift. |
Use Scenario: Generating clean reset signal for ARM Cortex-M0+ MCU during cold start and supply ramp-up. IC Role / Device Role / Timing Role: Bias element establishing reliable reset threshold independent of VDD ripple. Use Value: Low 0.5 μA leakage preserves capacitor hold-up time; DO-41 package allows manual rework on legacy PCBs. |
| Automotive Sensor Signal Conditioning | LED Driver Current Regulation |
Use Scenario: Clamping amplified thermistor output in engine coolant temperature circuit exposed to load dump transients. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting op-amp input stage from ISO 7637-2 pulse 5a. Use Value: 1.0 W rating absorbs 100 ms pulses up to 30 V; -65°C to +200°C range matches under-hood thermal requirements. |
Use Scenario: Setting reference voltage for constant-current source driving high-brightness indicator LEDs in dashboard backlighting. IC Role / Device Role / Timing Role: Precision voltage reference defining ISET in LM317-based current mirror. Use Value: 25 Ω ZZ maintains <10 mV output shift across 1–10 mA sense current range, ensuring LED brightness stability. |
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%, 1.0 W, DO-41, but higher ZZ = 8 Ω @ 19 mA - measured at higher test current | Lower dynamic impedance at higher bias current; less suitable for low-current bias networks | Select when operating near 20 mA and requiring tighter regulation under load variation |
| MMSZ5240B | 10 V ±5%, SOD-123 surface-mount, 500 mW - different voltage grade and package | Not a voltage match; requires layout change and derating for same power handling | Choose only if board space constraints mandate SMT and 10 V threshold is acceptable in target design |
Compared with BZX85C9V1, the 1N4739A offers lower impedance at higher current but lacks identical thermal derating profile, while MMSZ5240B trades axial through-hole reliability for compactness at a different voltage-neither is pin-compatible, and both require schematic and layout validation.
Availability
BZX85C9V1 is available at Aetrix Electronics and suitable for industrial power supply monitoring, microcontroller reset circuits, automotive sensor conditioning, and LED driver current regulation requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for BZX85C9V1 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. Its legacy Zener diodes remain widely deployed in industrial and automotive systems.
The BZX85 series was engineered for cost-effective, high-reliability voltage reference and overvoltage protection in general-purpose analog and power circuits-emphasizing wide temperature operation, glass encapsulation integrity, and consistent parametric distribution.
FAQ
What is the exact Zener voltage tolerance for BZX85C9V1?
The BZX85C9V1 has a guaranteed Zener voltage range of 8.65 V to 9.55 V at 25°C, corresponding to ±5% tolerance around the nominal 9.1 V rating. This tolerance is tested per Fairchild's specification under thermal equilibrium conditions with 3/8″ lead length and TL = 30°C ±1°C. The BZX85C9V1 datasheet confirms this range in the Electrical Characteristics table.
Can BZX85C9V1 be used in surface-mount designs?
No, the BZX85C9V1 is exclusively offered in the axial-leaded DO-41 glass package and is not available in surface-mount variants. For SMT equivalents, designers must select alternative part numbers such as MMSZ5240B (10 V) or BZX384-C9V1 (SOD-323), which differ in voltage, power rating, and package. The BZX85C9V1 requires through-hole mounting and wave or hand soldering.
What is the maximum allowable junction temperature for BZX85C9V1?
The BZX85C9V1 has a maximum junction temperature (TJ) of +200°C, matching its storage temperature limit. This rating is specified in the Absolute Maximum Ratings table. Operation above 50°C ambient requires linear derating at 6.67 mW/°C, meaning usable power drops to 0.9 W at 65°C ambient. The BZX85C9V1's glass package contributes to its high-TJ capability.
How is cathode polarity identified on the BZX85C9V1 package?
The cathode of the BZX85C9V1 is marked by a single color band (typically black or dark gray) located near one end of the DO-41 glass body. This band aligns with the cathode terminal, which must be connected to the higher-potential node when the device is used in reverse-bias regulation or clamping mode. The BZX85C9V1 physical dimensions drawing confirms this marking convention per JEDEC DO-204AL.
Does BZX85C9V1 meet RoHS requirements?
Yes, the BZX85C9V1 manufactured by Fairchild Semiconductor complies with RoHS Directive 2011/65/EU, as confirmed in Fairchild's official product change notices and packaging documentation. Lead-free termination and halogen-free glass encapsulation were implemented prior to the 2016 ON Semiconductor acquisition. The BZX85C9V1 is suitable for environmentally regulated industrial and consumer applications.
BZX85C9V1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 1.3 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 6.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41G
BZX85C9V1 FAQ
1.How can I place an order for BZX85C9V1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C9V1 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 BZX85C9V1 reliable?
The price and inventory of BZX85C9V1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C9V1 is usually 5 days.
3.What payment methods are accepted for BZX85C9V1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C9V1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C9V1?
BZX85C9V1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C9V1 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 BZX85C9V1?
For technical support, including BZX85C9V1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C9V1 requirements.
6.How does Aetrix verify that BZX85C9V1 is sourced from the original manufacturer or authorized distributors?
All BZX85C9V1 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 BZX85C9V1 meets industry standards.
7.What is the process for return or replacement of BZX85C9V1?
All BZX85C9V1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C9V1, 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 BZX85C9V1 part is unused and in its original packaging.
Return procedure for BZX85C9V1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C9V1 Tags
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