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onsemi 1N5908
- Part No.:
- 1N5908
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N5908.pdf
- Description:
- TVS DIODE 5VWM 8.5VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,529
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Product details
Overview
1N5908 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel clamping protection of sensitive electronics against high-energy transients. It features a 5.0 V working peak reverse voltage (VRWM), 8.5 V maximum clamping voltage at 120 A peak pulse current, low leakage (<1 µA at VRWM), <1 ns response time, and axial leaded Surmetic™ plastic package (Case 41A). It is widely deployed in power supplies and industrial control systems.
For engineers reviewing the 1N5908 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance at 120 A, thermal resistance (20 °C/W), steady-state power derating above 75 °C, unidirectional polarity marking, and JEDEC-compliant axial lead form factor for through-hole mounting.
Technical Context
The 1N5908 operates as a unidirectional avalanche-clamped Zener TVS, triggered by reverse-biased overvoltage events exceeding its 5.0 V VRWM. Its clamping action begins within <1 ns, limiting transient voltages to ≤8.5 V at 120 A IPP while dissipating up to 1500 W for 1 ms non-repetitive pulses.
Thermal management relies on junction-to-lead conduction (RJL = 20 °C/W), with steady-state dissipation limited to 5.0 W at TL ≤ 75 °C and derated linearly beyond. The device uses a void-free thermosetting plastic case (Case 41A) with corrosion-resistant, solderable leads rated for 230 °C at 1/16″ from case for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 5.0 V - Maximum continuous reverse operating voltage before clamping initiates |
| IPP | 120 A - Peak pulse current capability at 1 ms, defining surge handling capacity |
| VC @ IPP | 8.5 V - Maximum clamped voltage seen by protected circuit under full 120 A transient |
| RJL | 20 °C/W - Junction-to-lead thermal resistance, critical for PCB trace heat sinking design |
| Leakage @ VRWM | <1 µA - Minimal reverse bias current ensuring negligible standby power loss |
| Response Time | <1 ns - Enables suppression of fast-rising ESD and lightning-induced transients |
| Package | Case 41A - Axial-leaded, void-free thermoset plastic housing with cathode band polarity marking |
Pinout & Package
1N5908 is housed in an axial-leaded Surmetic™ plastic package (JEDEC Case 41A), with cathode identified by a colored band. Leads are corrosion-resistant and solderable per IPC-J-STD-006, rated for 230 °C at 1/16″ from case for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse bias reference | Connected to system ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Clamping output / Transient sink | Connected to protected line; conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse rating | Supports robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) without failure |
| Low zener impedance | Ensures stable clamping voltage across wide current range, minimizing overshoot |
| Unidirectional JEDEC registration | Guarantees no bidirectional variant exists-designers must select alternate series for AC-line protection |
| Fast response <1 ns | Prevents sub-microsecond transients from reaching downstream ICs before clamping engages |
| Surmetic™ axial package | Enables reliable through-hole mounting with high mechanical strength and thermal stability |
Applications
| Industrial Power Supplies | Medical Equipment Inputs |
|---|---|
Use Scenario: Input stage of 24 V DC industrial power supply exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across input terminals to limit voltage excursions to ≤8.5 V during 120 A surges. Use Value: Prevents damage to upstream rectifiers and downstream DC-DC controllers by absorbing 1500 W transient energy within 1 ms. | Use Scenario: Patient-connected sensor interface in diagnostic imaging equipment requiring low-leakage protection. IC Role / Device Role / Timing Role: Primary overvoltage guard on analog front-end power rail, leveraging <1 µA leakage at 5 V to avoid signal corruption. Use Value: Maintains signal integrity while suppressing ESD events per IEC 61000-4-2 without introducing offset or drift. |
| Numerical Control Systems | Business Machine Interfaces |
Use Scenario: Protection of stepper motor driver enable lines subject to back-EMF spikes in CNC motion controllers. IC Role / Device Role / Timing Role: Fast-response (≤1 ns) clamp on logic-level control inputs to prevent latch-up in gate drivers. Use Value: Eliminates false triggering and resets caused by 50–100 ns transients induced by motor commutation. | Use Scenario: USB and RS-232 port protection in point-of-sale terminals located in electrically noisy retail environments. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS and data lines to absorb contact discharge ESD per IEC 61000-4-2 ±8 kV. Use Value: Provides cost-effective, field-proven immunity without requiring additional series impedance or filtering components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ5.0A | Surface-mount SMB package; 600 W peak power; 9.2 V clamping at 65 A | Lower surge rating and different footprint; requires PCB redesign | Preferred for space-constrained designs where 600 W suffices and SMT assembly is used |
| 1N6267A | Same axial package (Case 41A); 1500 W; 5.0 V VRWM; but bidirectional construction | Supports AC-line or differential signal protection; not JEDEC-registered as unidirectional | Select only when bidirectional clamping is required; not a drop-in replacement for 1N5908 |
Compared with SMBJ5.0A and 1N6267A, the 1N5908 offers higher surge margin (1500 W vs. 600 W) and JEDEC-guaranteed unidirectionality-critical for DC rail protection where reverse conduction must be avoided.
Availability
1N5908 is available at Aetrix Electronics and suitable for industrial power supplies, medical equipment inputs, numerical controls, and business machine interfaces requiring stable component supply and long-term obsolescence management.
Supply support for 1N5908 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 (now part of onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N5908 belongs to the Mosorb™ family of high-power TVS diodes, engineered specifically for rugged, high-energy transient suppression in harsh industrial and medical environments using axial-leaded packaging.
FAQ
What is the maximum clamping voltage of the 1N5908 at its rated peak pulse current?
The 1N5908 has a maximum clamping voltage (VC) of 8.5 V at 120 A peak pulse current (IPP). This value is measured under standardized 1 ms unidirectional pulse conditions per Figure 4 in the official datasheet and defines the upper voltage limit imposed on protected circuits during worst-case transients.
Is the 1N5908 suitable for bidirectional transient protection?
No-the 1N5908 is JEDEC registered exclusively as a unidirectional device, with no bidirectional variant offered. For AC-line or differential signal protection, designers must select alternatives such as the 1N6267A or 1.5KE5.0CA series, which are explicitly tested and rated for bidirectional operation.
What is the thermal resistance specification for the 1N5908, and how does it affect PCB layout?
The 1N5908 has a junction-to-lead thermal resistance (RJL) of 20 °C/W. This means each watt dissipated raises the junction temperature 20 °C above the lead temperature. Effective PCB layout must provide low-thermal-resistance copper paths from leads to internal/external ground planes to maintain TL ≤ 75 °C for full 5.0 W steady-state operation.
How does the 1N5908's response time impact its effectiveness against ESD events?
The 1N5908's typical response time of <1 ns ensures clamping activation well before most ESD waveforms (e.g., IEC 61000-4-2's 0.7–1 ns rise time) reach damaging voltage levels. This enables effective protection of CMOS and MOS inputs without relying on external RC filtering or slower secondary protection stages.
What is the steady-state power dissipation limit for the 1N5908, and how is it derated with temperature?
The 1N5908 is rated for 5.0 W steady-state power dissipation at lead temperature (TL) ≤ 75 °C. Above 75 °C, dissipation is linearly derated at 50 mW/°C, reaching zero at 175 °C. This derating curve (Figure 3) must be applied when ambient or board temperatures exceed 75 °C to prevent thermal runaway or premature failure.
1N5908 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-201AD, Axial
- Series:
- Mosorb™
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- 6V
- Voltage - Clamping (Max) @ Ipp:
- 8.5V
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N5908 FAQ
1.How can I place an order for 1N5908 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5908 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 1N5908 reliable?
The price and inventory of 1N5908 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5908 is usually 5 days.
3.What payment methods are accepted for 1N5908?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5908 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5908?
1N5908 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5908 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 1N5908?
For technical support, including 1N5908 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5908 requirements.
6.How does Aetrix verify that 1N5908 is sourced from the original manufacturer or authorized distributors?
All 1N5908 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 1N5908 meets industry standards.
7.What is the process for return or replacement of 1N5908?
All 1N5908 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5908, 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 1N5908 part is unused and in its original packaging.
Return procedure for 1N5908:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5908 Tags
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onsemi
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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