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onsemi 1N6008B
- Part No.:
- 1N6008B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N6008B.pdf
- Description:
- DIODE ZENER 22V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:4,277
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Product details
Overview
1N6008B from Fairchild Semiconductor is a 5% tolerance, 22 V nominal Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 4.0 mW/°C derating, 5 mA test current, and 55 mA maximum Zener current (IZM), used for precision voltage regulation in low-power analog reference and overvoltage protection circuits.
For engineers reviewing the 1N6008B datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal limits, cathode identification, and direct alternatives for voltage reference design, power supply feedback, and ESD clamp staging.
Technical Context
The 1N6008B operates as a two-terminal silicon Zener diode with sharp reverse breakdown at 20.9 V (min) to 23.1 V (max) under 5 mA test current, exhibiting 600 Ω dynamic impedance (ZZ @ IZ) and 600 Ω knee impedance (ZZK @ 250 μA). Its DO-35 glass package enables axial lead mounting and stable operation across –65°C to +200°C junction temperature range.
It features 0.1 mA leakage current (IR) at 17 V reverse voltage (VR), forward voltage ≤1.2 V at 200 mA, and is marked with Fairchild logo, "00" on second line, and "8B" on third line - confirming identity and cathode band orientation per JEDEC standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.9–23.1 V @ 5 mA - defines regulated output voltage window for feedback or clamping |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating |
| Zener Impedance (ZZ) | 600 Ω @ 5 mA - indicates voltage stability under small-signal AC load variation |
| Max Zener Current (IZM) | 55 mA - determines peak safe DC current before exceeding PD limit at elevated temperature |
| Leakage Current (IR) | 0.1 mA @ VR = 17 V - ensures minimal error current in high-impedance reference nodes |
| Operating Temp Range | –65°C to +200°C - supports industrial, automotive under-hood, and aerospace environments |
Pinout & Package
DO-35 glass axial-leaded package with cathode identified by a single color band; leads are non-polarized except for cathode marking - no active circuitry requires specific pin assignment beyond anode/cathode polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower potential side in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with color band; connected to higher potential side to enable controlled reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables predictable regulation without post-manufacture trimming in cost-sensitive designs |
| DO-35 glass package | Provides hermetic sealing and stable long-term VZ drift under thermal cycling |
| 600 Ω Zener impedance | Maintains <±2% output voltage deviation across 1–10 mA load current variation |
| 0.1 mA leakage at 17 V | Minimizes bias error in high-resistance voltage divider networks and sensor references |
| –65°C to +200°C operating range | Supports deployment in engine control units, downhole tools, and military-grade power supplies |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage of linear regulators or switching converter feedback loops. IC Role / Device Role / Timing Role: Zener diode provides stable reference voltage to error amplifier input. Use Value: 20.9–23.1 V range matches common 24 V rail sensing requirements with ±5% accuracy. |
Use Scenario: Protecting downstream IC inputs from transient overvoltage events. IC Role / Device Role / Timing Role: Clamps surge energy above 23.1 V by entering controlled reverse conduction. Use Value: 55 mA IZM rating allows absorption of short-duration transients without thermal runaway. |
| Reference Voltage Source | ESD Protection Stage |
Use Scenario: Generating precise bias voltages for op-amp comparators or ADC references. IC Role / Device Role / Timing Role: Serves as passive, low-noise voltage reference node in analog signal chains. Use Value: 600 Ω ZZ and 0.1 mA IR ensure <100 μV ripple contribution in 10 kΩ source-impedance networks. |
Use Scenario: First-stage clamping in I/O protection networks prior to TVS diodes. IC Role / Device Role / Timing Role: Absorbs low-energy ESD pulses (IEC 61000-4-2 Level 2) before secondary protection triggers. Use Value: Fast turn-on at 20.9 V and DO-35 thermal mass provide repeatable clamping without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V nominal, 1 W rating, DO-41 package, 20 Ω ZZ @ 21 mA | Higher power, lower voltage, tighter impedance - suited for 12 V regulator feedback | Select when higher power margin or lower VZ is required; not interchangeable due to voltage and package mismatch |
| BZX55C22 | 22 V nominal, 5% tolerance, DO-35, 500 mW, 50 Ω ZZ @ 5 mA | Lower dynamic impedance and same package - improves regulation accuracy in precision references | Preferred where tighter voltage regulation and lower noise are critical; direct DO-35 drop-in with improved ZZ |
Compared with 1N6008B, the BZX55C22 offers superior regulation stability (50 Ω vs. 600 Ω ZZ) in identical DO-35 form factor, while the 1N4742A provides higher power but at half the voltage and different mechanical footprint - making BZX55C22 the closest functional upgrade for 22 V reference use cases.
Availability
1N6008B is available at Aetrix Electronics and suitable for voltage reference design, power supply feedback networks, and overvoltage protection circuits requiring stable component supply and long-lifecycle support.
Supply support for 1N6008B 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 diode portfolio remains widely deployed in industrial systems.
The 1N6008B belongs to Fairchild's 1N5985B–1N6025B family of general-purpose Zener diodes designed for reliable voltage regulation and clamping in cost-sensitive, medium-reliability applications across consumer, industrial, and computing markets.
FAQ
What is the nominal Zener voltage of the 1N6008B?
The 1N6008B has a nominal Zener voltage of 22 V, with a guaranteed range of 20.9 V (minimum) to 23.1 V (maximum) when tested at 5 mA. This specification is measured under thermal equilibrium conditions at lead temperature TL = 30°C ± 1°C with 3/8″ lead length, per Fairchild's Rev. C2 datasheet. The 1N6008B maintains this voltage window across its full operating temperature range.
What package type does the 1N6008B use?
The 1N6008B uses a DO-35 glass axial-leaded package with cathode identified by a single color band. This hermetically sealed package supports operation from –65°C to +200°C and is compatible with through-hole assembly processes. The 1N6008B shares mechanical dimensions and marking conventions (Fairchild logo, "00", "8B") with other members of the 1N5985B–1N6025B series.
What is the maximum Zener current (IZM) for the 1N6008B?
The maximum Zener current (IZM) for the 1N6008B is 55 mA, determined by its 500 mW power rating and nominal 22 V Zener voltage. This value reflects worst-case current handling capability under thermal derating constraints and is specified at TA = 25°C. Exceeding 55 mA risks exceeding the device's power dissipation limit unless ambient and lead temperature conditions are tightly controlled.
How is the cathode identified on the 1N6008B?
The cathode of the 1N6008B is identified by a single color band on the DO-35 glass body, consistent with JEDEC standards. The top marking consists of three lines: Fairchild logo (first line), "00" (second line), and "8B" (third line), confirming part identity and cathode orientation. This marking scheme is documented in the official Fairchild 1N5985B–1N6025B Rev. C2 datasheet.
Does the 1N6008B have a specified forward voltage?
Yes, the 1N6008B has a maximum forward voltage (VF) of 1.2 V at 200 mA forward current, as stated in the Absolute Maximum Ratings table of the Fairchild datasheet. This parameter applies during forward conduction mode and is relevant for applications involving bidirectional protection or rectification functions, though the 1N6008B is primarily intended for reverse-biased Zener operation.
1N6008B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 17 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N6008B FAQ
1.How can I place an order for 1N6008B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6008B 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 1N6008B reliable?
The price and inventory of 1N6008B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6008B is usually 5 days.
3.What payment methods are accepted for 1N6008B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6008B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6008B?
1N6008B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6008B 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 1N6008B?
For technical support, including 1N6008B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6008B requirements.
6.How does Aetrix verify that 1N6008B is sourced from the original manufacturer or authorized distributors?
All 1N6008B 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 1N6008B meets industry standards.
7.What is the process for return or replacement of 1N6008B?
All 1N6008B units undergo pre-shipment inspection (PSI). If there is an issue with 1N6008B, 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 1N6008B part is unused and in its original packaging.
Return procedure for 1N6008B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6008B Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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