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STMicroelectronics 1N5908
- Part No.:
- 1N5908
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-201AD, Axial
- Datasheet:
-
1N5908.pdf
- Description:
- TVS DIODE 5VWM 8.5VC CB429
- Quantity:
- Payment:
- Shipping:
Inventory:5,074
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Product details
Overview
1N5908 from STMicroelectronics is a unidirectional Transil™ TVS diode designed for transient overvoltage protection in power rails and signal lines. It features a 5 V stand-off voltage, 6 V minimum breakdown voltage, 7.6 V clamping voltage at 30 A (10/1000 µs), 1500 W peak pulse power rating, and operates up to 175 °C junction temperature - used in industrial power supplies and automotive ECUs.
For engineers reviewing the 1N5908 datasheet, 1N5908 pinout, 1N5908 application, or 1N5908 equivalent, key selection criteria include clamping performance at 30 A, thermal resistance (20 °C/W for DO-201), JEDEC DO-201 package compatibility, IEC 61000-4-2 Level 4 ESD immunity (15 kV air / 8 kV contact), and UL 94 V0 flammability compliance.
Technical Context
This device uses planar junction technology to achieve low leakage current (<300 µA at 5 V) and stable high-temperature operation (Tj up to +175 °C). Its unidirectional configuration provides asymmetric surge suppression with cathode-banded polarity marking and defined forward voltage drop (≤3.0 V at 100 A).
The 1N5908 complies with IEC 61000-4-5 surge immunity and MIL-STD-883G HBM ESD testing (25 kV), and is rated for repetitive surges below 1500 W under 10/1000 µs waveform. Thermal impedance is characterized per IPC 7531 pad layout for DO-201 mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRWM) | 5 V - Maximum continuous reverse working voltage before significant conduction begins |
| Breakdown Voltage (VBR) | 6 V min @ 1 mA - Threshold where device enters avalanche region; ensures reliable triggering |
| Clamping Voltage (VCL) | 7.6 V @ 30 A, 10/1000 µs - Limits transient voltage seen by protected circuit during surge |
| Peak Pulse Power (PPP) | 1500 W @ Tj = 25 °C - Sustains high-energy transients without failure |
| Junction Temperature Range | –55 °C to +175 °C - Enables use in under-hood automotive and industrial environments |
| Leakage Current (IR) | ≤300 µA @ 5 V - Minimizes standby power loss in always-on systems |
| ESD Rating (IEC 61000-4-2) | ±15 kV air / ±8 kV contact - Meets Level 4 immunity for user-accessible interfaces |
Pinout & Package
1N5908 is housed in a JEDEC DO-201 axial leaded package with cathode indicated by a band on the body. Leads are solderable per MIL-STD-750 Method 2026, and epoxy meets UL 94 V0 flammability standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias | Connected to ground or lower-potential rail in unidirectional TVS configuration |
| Cathode (banded end) | Negative terminal in forward bias | Connected to protected line; conducts avalanche current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature reliability | Rated for continuous operation up to +175 °C junction temperature - supports under-hood and SMPS applications |
| Low-leakage planar junction | ≤300 µA @ 5 V - Reduces quiescent current impact in battery-powered or energy-sensitive designs |
| Standardized mechanical footprint | DO-201 outline compliant with EIA STD RS-481 and IEC 60286-3 - enables automated assembly and board-level interchangeability |
| Robust surge handling | 1500 W peak pulse power (10/1000 µs) with defined clamping behavior - protects downstream ICs from lightning-induced or inductive-switching transients |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 5 V microcontroller supply rails against load dump and alternator ripple in 12 V systems. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between VCC and GND to limit transient excursions during switching events. Use Value: Clamps to ≤7.6 V at 30 A, preventing latch-up or damage to 5 V logic while maintaining UL 94 V0 safety compliance. | Use Scenario: Safeguarding LIN bus transceiver inputs from ESD events during vehicle assembly and service. IC Role / Device Role / Timing Role: Standoff-rated TVS on LIN data line, leveraging 5 V VRWM to avoid interference with normal 12 V tolerant signaling. Use Value: Withstands ±15 kV air discharge (IEC 61000-4-2 Level 4), ensuring robustness without signal distortion during communication. |
| Telecom AC-DC Adapter Input Stage | Programmable Logic Controller (PLC) Digital I/O |
Use Scenario: Secondary-side surge suppression on 5 V output of isolated flyback converters powering sensitive peripherals. IC Role / Device Role / Timing Role: Fast-response TVS placed immediately after rectification and filtering to absorb residual transients escaping primary-side protection. Use Value: 1500 W capability handles repetitive surges from capacitor discharge or transformer ringing without degradation over time. | Use Scenario: Protecting 24 V digital input circuits from field-wiring induced transients in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-rated TVS on optocoupler input side, using DO-201's proven thermal mass to sustain repeated 10/1000 µs surges. Use Value: Junction-to-ambient thermal resistance of 75 °C/W (DO-201) allows stable operation even with ambient temperatures up to 85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ5.0A | DO-214AA package; 7.0 V clamping @ 30 A; 600 W rating | Lower power handling; surface-mount only; less thermal mass than DO-201 | Preferred for space-constrained PCBs where 600 W suffices and reflow compatibility is required |
| P6KE5.0A | DO-15 package; 9.2 V clamping @ 25 A; 600 W rating | Higher clamping voltage reduces protection margin for 5 V systems; axial leads same as 1N5908 | Acceptable for cost-sensitive legacy designs where 9.2 V clamping is tolerable |
Compared with SMBJ5.0A and P6KE5.0A, the 1N5908 offers superior 1500 W surge capacity and tighter 7.6 V clamping in the same DO-201 form factor - making it optimal for high-reliability industrial and automotive power rail protection where thermal endurance and low-voltage clamping are critical.
Availability
1N5908 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, telecom adapter input stages, and PLC digital I/O requiring stable component supply across extended temperature and surge stress conditions.
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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
The Transil™ TVS diode product line targets high-reliability transient suppression in harsh environments - engineered for IEC/EN 61000-4-x compliance, extended temperature operation, and long-term stability in mission-critical power and interface protection.
FAQ
What is the maximum clamping voltage of the 1N5908 at 30 A?
The 1N5908 has a maximum clamping voltage of 7.6 V at 30 A under the 10/1000 µs standard surge waveform, measured at Tamb = 25 °C. This value increases with junction temperature at a coefficient of +5.7 × 10−4 /°C, reaching approximately 8.5 V at Tj = 125 °C per the datasheet's derating formula.
Is the 1N5908 RoHS-compliant and halogen-free?
Yes, the 1N5908 is offered in an RoHS-compliant ECOPACK® package meeting EU Directive 2011/65/EU. The molding compound is halogen-free and certified to UL 94 V0 flammability. ST's ECOPACK® documentation confirms full compliance with both substance restrictions and packaging environmental standards.
Can the 1N5908 be used in bidirectional configurations?
No - the 1N5908 is strictly unidirectional, with cathode marked by a band. For bidirectional protection, ST recommends the complementary SM5908 (SMC package) or discrete back-to-back diode arrangements. Using two 1N5908 devices in series opposition is not validated and risks mismatched breakdown characteristics.
What is the recommended PCB pad layout for DO-201 mounting?
The datasheet specifies a recommended pad layout per IPC 7531 for DO-201, with copper surface area per lead optimized for thermal performance. For 75 °C/W junction-to-ambient resistance, each lead requires ≥1.5 cm² of 35 µm-thick FR4 copper. Minimum trace width is 1.5 mm, and thermal relief spokes must be avoided to maintain thermal conductivity.
1N5908 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-201AD, Axial
- Series:
- TRANSIL™
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- 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):
- 120A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- CB429
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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