My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SM6T68CA-M3/5B
;;2.jpg)
- Part No.:
- SM6T68CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T68CA-M3/5B.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,796
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SM6T68CA-M3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 68 V breakdown voltage (VBR = 64.6–71.4 V at 1 mA), 58.1 V stand-off voltage (VWM), 92 V maximum clamping voltage (VC) at 6.5 A, 600 W peak pulse power (10/1000 μs), and operates from −65 °C to +150 °C. It protects automotive sensor interfaces against inductive switching surges.
For engineers reviewing the SM6T68CA-M3/5B datasheet, SM6T68CA-M3/5B pinout, SM6T68CA-M3/5B application, or SM6T68CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.35), halogen-free RoHS compliance (M3 suffix), AEC-Q101 qualification readiness, and SMB footprint compatibility with automated SMT assembly.
Technical Context
The SM6T68CA-M3/5B implements a glass-passivated silicon junction optimized for fast response (<1 ps typical) to ESD and lightning-induced transients. Its bidirectional architecture enables symmetrical clamping without polarity dependency, supporting protection of AC-coupled or differential signal paths such as CAN FD or LIN bus lines.
It delivers 600 W peak pulse power under standardized 10/1000 μs waveform conditions with derating above 25 °C ambient, and exhibits low dynamic impedance (≈14 Ω calculated from ΔV/ΔI between 1 A and 6.5 A test points), ensuring stable voltage limiting during surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V at 1 mA - defines reliable conduction onset in both directions |
| VWM | 58.1 V - maximum continuous reverse voltage before leakage exceeds 1 μA |
| VC @ IPPM | 92.0 V at 6.5 A (10/1000 μs) - clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 600 W - peak transient energy absorption capacity without failure |
| TJ range | −65 °C to +150 °C - supports under-hood automotive and industrial environments |
| Package | SMB (DO-214AA) - 0.205" × 0.220" footprint with J-STD-002 solderable matte tin leads |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix); MSL Level 1, 260 °C reflow capable |
Pinout & Package
SM6T68CA-M3/5B uses the SMB (DO-214AA) surface-mount package: 2-terminal, non-polarized bidirectional device with no cathode marking. The case is molded compound rated UL 94 V-0; terminals are matte tin plated for reliable solder wetting per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Either terminal conducts during overvoltage in either polarity - no orientation required during placement |
| Case (body) | Thermal and mechanical interface | Provides thermal path to PCB copper pads (0.2" × 0.2" recommended); no electrical connection |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines without polarity concerns |
| 600 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Combination Wave surges in automotive ECUs |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on downstream ICs while maintaining margin above VWM |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking - reduces manufacturing overhead |
| AEC-Q101 ready (HM3 variant) | M3 suffix indicates halogen-free RoHS compliance; HM3 variant adds automotive qualification for critical modules |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across sensor signal and ground to shunt transients before reaching ADC input stage. Use Value: Maintains signal integrity below 92 V clamping threshold while surviving repeated 600 W pulses per ISO 7637-2. | Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers subject to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on each input channel, referenced to common ground plane. Use Value: Prevents false triggering or latch-up in optocoupler input stages during 10/1000 μs surges up to 6.5 A. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
Use Scenario: Shielding RS-485 transceiver data lines in base station equipment from induced lightning surges. IC Role / Device Role / Timing Role: Differential-mode TVS across A/B bus lines, leveraging bidirectional symmetry for polarity-agnostic protection. Use Value: Clamps common-mode transients to <92 V within nanoseconds, preserving signal eye diagram integrity at 10 Mbps. | Use Scenario: Secondary-level surge suppression on VBUS and D+/D− lines of USB 2.0 host ports in smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance (CJ ≈ 100 pF at 0 V) bidirectional clamp placed after primary ESD diode array. Use Value: Absorbs 600 W IEC 61000-4-5 surges without degrading high-speed signal rise time or causing data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ68CA | Same VBR range (64.6–71.4 V), but lower PPPM = 400 W; SMA package (smaller footprint, higher RθJA = 140 °C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump simulation | Select when board space is constrained and surge energy does not exceed 400 W |
| 1.5KE68CA | Higher PPPM = 1500 W, axial lead DO-201 package; VC = 112 V at 13.2 A - less tight clamping | Through-hole mounting only; incompatible with automated SMT lines; higher VC increases risk to protected ICs | Choose for legacy through-hole designs requiring higher surge margin and accepting larger board area |
Compared with SMAJ68CA and 1.5KE68CA, the SM6T68CA-M3/5B offers optimal balance of 600 W surge handling, SMB SMT compatibility, low clamping voltage, and halogen-free compliance - making it preferred for new automotive and industrial PCB designs requiring AEC-Q101 readiness and volume manufacturability.
Availability
SM6T68CA-M3/5B is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, telecom line interface circuits, and consumer USB power delivery systems requiring stable component supply and halogen-free compliance.
Supply support for SM6T68CA-M3/5B 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 automotive-grade qualification.
The SM6T Series is engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where bidirectional clamping, high surge tolerance, and AEC-Q101 readiness are mandatory design requirements.
FAQ
What does the "CA" suffix indicate in SM6T68CA-M3/5B?
The "CA" suffix in SM6T68CA-M3/5B denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage clamping in both polarities. Unlike unidirectional variants (e.g., SM6T68A), SM6T68CA-M3/5B has no cathode marking and functions identically regardless of voltage polarity applied across its terminals - essential for protecting AC-coupled or differential signal paths. This is confirmed in Vishay's SM6T datasheet revision 09-Jan-2024, section "DEVICES FOR BIDIRECTION APPLICATIONS".
Is SM6T68CA-M3/5B AEC-Q101 qualified?
SM6T68CA-M3/5B itself is halogen-free and RoHS-compliant (per M3 suffix), but not AEC-Q101 qualified. The AEC-Q101 version uses the HM3 suffix (e.g., SM6T68CAHM3_B/I). Vishay's ordering information table explicitly separates M3 (commercial grade) from HM3 (AEC-Q101 qualified), and the "MECHANICAL DATA" section confirms HM3 variants carry automotive qualification. Engineers requiring automotive qualification must specify the HM3 part number, not SM6T68CA-M3/5B.
What is the maximum clamping voltage of SM6T68CA-M3/5B and under what test condition?
The maximum clamping voltage (VC) of SM6T68CA-M3/5B is 92.0 V, measured at a peak pulse current (IPPM) of 6.5 A using the standardized 10/1000 μs double-exponential waveform. This value is specified in the "ELECTRICAL CHARACTERISTICS" table on page 2 of Vishay document 88385, and represents the upper voltage limit imposed on protected circuitry during worst-case transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Can SM6T68CA-M3/5B be used in place of a unidirectional TVS like SM6T68A?
No - SM6T68CA-M3/5B is bidirectional and cannot directly replace unidirectional SM6T68A in DC-biased applications where forward conduction must be blocked. While both share identical VBR and VC values, SM6T68A conducts only in reverse bias and blocks forward current, whereas SM6T68CA-M3/5B clamps in both directions. Substitution requires verifying that the protected circuit tolerates bidirectional conduction - e.g., AC signal lines - otherwise unintended forward current paths may occur.
What is the thermal resistance and power derating behavior of SM6T68CA-M3/5B?
SM6T68CA-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. Its 5.0 W steady-state power dissipation (PD) is derated linearly above 25 °C ambient, dropping to zero at 125 °C - as shown in Figure 2 of Vishay document 88385. This derating curve ensures safe operation in enclosed enclosures or high-temperature industrial environments when layout adheres to recommended pad dimensions.
SM6T68CA-M3/5B 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:
- -
- Bidirectional Channels:
- 1
- 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)
SM6T68CA-M3/5B FAQ
1.How can I place an order for SM6T68CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T68CA-M3/5B 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 SM6T68CA-M3/5B reliable?
The price and inventory of SM6T68CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T68CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SM6T68CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T68CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T68CA-M3/5B?
SM6T68CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T68CA-M3/5B 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 SM6T68CA-M3/5B?
For technical support, including SM6T68CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T68CA-M3/5B requirements.
6.How does Aetrix verify that SM6T68CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T68CA-M3/5B 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 SM6T68CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SM6T68CA-M3/5B?
All SM6T68CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T68CA-M3/5B, 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 SM6T68CA-M3/5B part is unused and in its original packaging.
Return procedure for SM6T68CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T68CA-M3/5B Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
