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Vishay General Semiconductor - Diodes Division SM6T68A-E3/5B
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- Part No.:
- SM6T68A-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68A-E3/5B.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,450
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Product details
Overview
SM6T68A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, with 64.6 V minimum breakdown voltage (VBR), 58.1 V standoff voltage (VWM), 92.0 V maximum clamping voltage (VC) at 6.5 A peak pulse current, and 600 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs and ICs against inductive switching transients in automotive power supplies.
For engineers reviewing the SM6T68A-E3/5B datasheet, SM6T68A-E3/5B pinout, SM6T68A-E3/5B application, or SM6T68A-E3/5B equivalent, key selection criteria include clamping voltage margin relative to protected device's absolute maximum rating, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, and RoHS-compliant matte tin-plated leads solderable per J-STD-002.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (<1 μA leakage at 58.1 V), then rapidly avalanches when transient voltage exceeds VBR (64.6–71.4 V), limiting downstream voltage to ≤92.0 V at 6.5 A. Its low-inductance SMB package enables fast response to sub-microsecond transients.
Designed for single-polarity DC line protection, SM6T68A-E3/5B features glass-passivated junction, meets MSL Level 1 (260 °C reflow), and supports operating junction temperatures from –65 °C to +150 °C. It is not rated for bidirectional use-CA-suffix variants required for AC or dual-rail applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58.1 V - Maximum continuous reverse working voltage before leakage exceeds 1 μA; sets upper limit of safe DC operating range. |
| VBR (min/max) | 64.6 V / 71.4 V at 1.0 mA - Breakdown threshold range defining turn-on onset; ensures reliable clamping above system nominal voltage. |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - Clamped voltage during worst-case surge; must stay below protected IC's absolute max rating. |
| PPPM | 600 W - Peak pulse power handling capability; determines survivability against standardized lightning/inductive spikes. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on 0.2" × 0.2" copper pads; governs temperature rise under sustained power dissipation. |
| Polarity | Unidirectional - Cathode marked by band; blocks reverse current until avalanche, suitable for DC rail protection only. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case meeting UL 94 V-0; dimensions 4.57 mm × 3.94 mm × 2.20 mm; matte tin-plated leads, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-side reference; completes clamping loop during overvoltage event. |
| Cathode | Protected line connection / avalanche terminal | Connected to line being protected (e.g., 48 V supply rail); avalanche conduction occurs from cathode to anode. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges without derating on standard PCB layouts. |
| Glass passivated chip junction | Ensures stable VBR and low leakage over temperature and lifetime; eliminates risk of junction corrosion in humid environments. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and single-reflow processing at 260 °C peak, compatible with standard SMT assembly lines. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU and JESD201 Class 2 whisker resistance; suitable for industrial and consumer production. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (up to 60 V, 100 ms) on 24 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground, clamping surges before they reach DC-DC converter input. Use Value: Limits voltage to ≤92.0 V during 6.5 A transient, protecting downstream regulators rated for 100 V absolute max. | Use Scenario: Shields 24 V digital input channels of programmable logic controllers from field-wiring induced transients. IC Role / Device Role / Timing Role: Shunt protector across optocoupler input terminals, diverting surge energy away from LED and driver circuitry. Use Value: Withstands repeated 1 kV/500 A 10/1000 μs pulses per IEC 61000-4-5 Level 3, ensuring >100,000 surge cycles without degradation. |
| Telecom DC Power Feeds | Motor Drive Gate Driver Protection |
Use Scenario: Guards -48 V telecom rectifier outputs against switching noise and accidental short-circuit recovery spikes. IC Role / Device Role / Timing Role: Mounted directly at power entry connector, acting as first-line defense before bulk capacitance and LDOs. Use Value: Low 100 °C/W RθJA allows operation up to +85 °C ambient without thermal runaway during burst-mode surges. | Use Scenario: Protects high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during fast switching. IC Role / Device Role / Timing Role: Placed between gate and source, clamping dv/dt-induced overshoot that could exceed gate oxide breakdown. Use Value: 92.0 V clamping voltage stays well below typical 100 V gate-source rating, preventing irreversible gate oxide damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A-E3/52 | Same SMB package, 64 V VWM, but higher VC = 103 V at 6.2 A; lower PPPM = 600 W same, but 10% higher clamping voltage. | Less margin for 100 V-rated devices; requires verification of protected IC's VDS(max) headroom. | Select when legacy design uses SMBJ series footprint and tighter VWM tolerance is needed. |
| 1.5SMC68A | Same VWM/VBR specs but in larger SMC (DO-214AB) package; RθJA = 40 °C/W vs. 100 °C/W; 1.5× higher IFSM. | Better thermal performance but incompatible with SMB land pattern; requires PCB redesign. | Choose for high-reliability industrial systems needing extended surge endurance and lower thermal resistance. |
Compared with SMBJ64A-E3/52 and 1.5SMC68A, SM6T68A-E3/5B offers optimal balance of clamping precision (92.0 V), SMB footprint compatibility, and commercial-grade cost-making it ideal for space-constrained automotive and telecom modules where layout reuse is critical.
Availability
SM6T68A-E3/5B is available at Aetrix Electronics and suitable for automotive ECU power rails, industrial PLC inputs, telecom -48 V feeds, and motor drive gate protection requiring stable component supply and RoHS-compliant sourcing.
Supply support for SM6T68A-E3/5B 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and AEC-Q qualification.
The SM6T Series is designed specifically for surface-mount transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where compact size, repeatable clamping, and reflow compatibility are mandatory.
FAQ
What is the maximum clamping voltage of SM6T68A-E3/5B under standard test conditions?
The SM6T68A-E3/5B has a maximum clamping voltage (VC) of 92.0 V when subjected to a 10/1000 μs waveform at 6.5 A peak pulse current. This value is measured per JEDEC standards and reflects the actual voltage seen by downstream components during surge events. The SM6T68A-E3/5B maintains this clamping performance across its specified operating temperature range of –65 °C to +150 °C.
Is SM6T68A-E3/5B suitable for bidirectional signal line protection?
No, SM6T68A-E3/5B is a unidirectional TVS diode and is not suitable for bidirectional signal line protection. Its cathode band indicates polarity, and it conducts only when the cathode is positive relative to the anode. For AC or dual-rail applications, bidirectional variants such as SM6T68CA-E3/5B must be used. Using SM6T68A-E3/5B on bidirectional lines risks failure during negative transients.
Does SM6T68A-E3/5B meet automotive qualification standards?
The base SM6T68A-E3/5B is RoHS-compliant commercial grade and not AEC-Q101 qualified. However, Vishay offers automotive-qualified versions under ordering codes SM6T68AHE3_B/I (AEC-Q101, halogen-free, 13" reel). SM6T68A-E3/5B itself is widely used in non-safety-critical automotive subsystems but requires validation per OEM requirements before deployment in Q101-mandated applications.
What is the thermal resistance of SM6T68A-E3/5B, and how does it affect layout?
The SM6T68A-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This means a 1 W power dissipation causes ~100 °C temperature rise above ambient. To maintain reliability, PCB layout must provide adequate copper area and avoid thermal bottlenecks-especially important during repetitive surge events. The SM6T68A-E3/5B datasheet specifies minimum pad dimensions to achieve this rating.
How does the E3/5B suffix impact packaging and compliance for SM6T68A-E3/5B?
The E3/5B suffix indicates RoHS-compliant construction (E3) and packaging in a 13-inch diameter plastic tape and reel containing 3200 units (5B). The matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 mechanical durability standards. This configuration supports high-volume automated placement and complies with EU RoHS Directive 2011/65/EU, making SM6T68A-E3/5B suitable for global commercial manufacturing.
SM6T68A-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T68A-E3/5B FAQ
1.How can I place an order for SM6T68A-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68A-E3/5B 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 SM6T68A-E3/5B reliable?
The price and inventory of SM6T68A-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68A-E3/5B is usually 5 days.
3.What payment methods are accepted for SM6T68A-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68A-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68A-E3/5B?
SM6T68A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68A-E3/5B 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 SM6T68A-E3/5B?
For technical support, including SM6T68A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68A-E3/5B requirements.
6.How does Aetrix verify that SM6T68A-E3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T68A-E3/5B 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 SM6T68A-E3/5B meets industry standards.
7.What is the process for return or replacement of SM6T68A-E3/5B?
All SM6T68A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68A-E3/5B, 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 SM6T68A-E3/5B part is unused and in its original packaging.
Return procedure for SM6T68A-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68A-E3/5B Tags
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