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Vishay General Semiconductor - Diodes Division SM6T30CAHM3_A/I
- Part No.:
- SM6T30CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T30CAHM3_A/I.pdf
- Description:
- TVS DIODE 25.6VWM 41.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,224
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Product details
Overview
SM6T30CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 30 V standoff voltage (VWM), 33.3 V minimum breakdown voltage (VBR), 600 W peak pulse power (10/1000 μs), and 41.5 V maximum clamping voltage at 14.5 A IPPM - deployed for ESD and surge protection on automotive sensor signal lines and power rails.
For engineers reviewing the SM6T30CAHM3_A/I datasheet, SM6T30CAHM3_A/I pinout, SM6T30CAHM3_A/I application, or SM6T30CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VBR ≈ 1.24), and SMB thermal performance under repetitive transients.
Technical Context
This bidirectional TVS operates symmetrically in both polarities with identical VBR (33.3–37.1 V), VC (41.5 V @ 14.5 A), and ID leakage (≤1.0 μA @ 25.6 V), enabling robust protection of AC-coupled or floating interfaces without polarity concerns. Its glass-passivated junction ensures stable avalanche characteristics across temperature.
Designed for surface-mount automated assembly, the device meets MSL Level 1 per J-STD-020 (260 °C peak reflow), features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and delivers low-inductance clamping critical for fast-rising transients like EFT and ISO 7637-2 pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 25.6 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for protected circuitry. |
| VBR min / max | 33.3 V / 37.1 V at 1.0 mA - Ensures predictable, repeatable avalanche onset within tight tolerance for reliable overvoltage thresholding. |
| VC @ IPPM | 41.5 V at 14.5 A (10/1000 μs) - Clamping voltage during worst-case surge; limits downstream voltage stress to <42 V under 600 W transient. |
| PPPM | 600 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV) surge testing when properly laid out. |
| TJ max | +150 °C - Maximum junction temperature rating; enables operation in under-hood automotive environments with sustained thermal load. |
| Package | SMB (DO-214AA) - Standardized 2-pin SMD outline with 5.0 mm × 5.0 mm copper pad requirement; optimized for thermal dissipation and board space efficiency. |
Pinout & Package
SMB (DO-214AA) surface-mount package with symmetrical dual-terminal construction: no polarity marking required for bidirectional operation; terminals are matte tin-plated, solderable per J-STD-002, and qualified to JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive half-cycle) | Conducts surge current into device during positive voltage excursion; forms one side of symmetrical avalanche path. |
| Cathode | Transient current entry point (negative half-cycle) | Conducts surge current into device during negative voltage excursion; completes bidirectional clamping loop with Anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; supports under-hood and ADAS sensor applications. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC JS709E; eliminates brominated flame retardants while maintaining UL 94 V-0 flammability rating. |
| 600 W peak pulse power (10/1000 μs) | Withstands high-energy transients such as load dump surges and inductive switching spikes without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.24) | Minimizes overvoltage overshoot during clamping; reduces risk of damage to downstream ICs like CAN transceivers or ADC front-ends. |
Applications
| Automotive Sensor Protection | Industrial Fieldbus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and analog sensor outputs (e.g., pressure, temperature) from ISO 7637-2 pulses and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector or IC input pins to shunt surge energy before it reaches sensitive analog front-ends or communication PHYs. Use Value: Maintains signal integrity by limiting transient voltage to ≤41.5 V while surviving repeated 10/1000 μs surges up to 600 W - critical for AEC-Q100 Grade 2 compliance. | Use Scenario: Safeguarding RS-485/RS-422 transceivers and PLC I/O modules against lightning-induced surges and ground potential differences in factory automation systems. IC Role / Device Role / Timing Role: Symmetrical transient suppressor across differential pair or supply rail to equalize voltage excursions and prevent latch-up in interface ICs. Use Value: Enables robust fieldbus operation in harsh industrial environments where >1 kV common-mode surges occur; SMB footprint allows dense layout near connectors. |
| Consumer Power Adapter Input | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage suppression in USB PD and AC/DC adapters exposed to conducted transients per IEC 61000-4-5. IC Role / Device Role / Timing Role: Fast-response clamping device placed after rectifier but before primary controller IC to absorb residual line surges. Use Value: Prevents false triggering or damage to PWM controllers by clamping transients within 1 ns response time and holding voltage below 42 V at full rated current. | Use Scenario: Primary protection for Ethernet PHYs and DSL line drivers subjected to induced surges from nearby power lines or lightning coupling. IC Role / Device Role / Timing Role: First-stage TVS on RJ-45 magnetics secondary side to limit common-mode voltage swing before transformer isolation. Use Value: Supports GR-1089-CORE Level 3 surge immunity (≥2 kV) with minimal capacitance impact (<100 pF), preserving signal integrity at 100 Mbps+ data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Same VWM (28.2 V), slightly higher VC (49.9 V @ 12.0 A), lower PPPM (400 W), SMA package (larger RθJA = 140 °C/W) | Limited to lower-energy transients; less suitable for automotive load dump due to reduced power rating and thermal performance | Select when cost sensitivity outweighs AEC-Q101 need and surge levels remain ≤400 W |
| 1.5KE33CA | Higher VWM (28.2 V), same VC (49.9 V), same PPPM (600 W), axial DO-15 package (manual assembly, higher inductance) | Not suitable for automated SMT lines; incompatible with high-density PCB layouts or reflow profiles requiring MSL-1 compliance | Choose only for legacy through-hole designs or prototyping where SMB footprint is unavailable |
Compared with SMAJ33CA and 1.5KE33CA, SM6T30CAHM3_A/I offers superior automotive suitability via AEC-Q101 qualification, halogen-free compliance, lower clamping voltage (41.5 V vs. ≥49.9 V), and optimized SMB thermal resistance (RθJA = 100 °C/W), making it preferred for production-grade automotive and industrial SMT applications.
Availability
SM6T30CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial fieldbus interfaces, and telecom line card designs requiring stable component supply with AEC-Q101 assurance and halogen-free compliance.
Supply support for SM6T30CAHM3_A/I 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 validation.
The SM6T Series is engineered specifically for high-reliability transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping performance, AEC-Q101 qualification, and SMT-ready packaging for demanding surge environments.
FAQ
What is the clamping voltage of SM6T30CAHM3_A/I at its rated peak pulse current?
The SM6T30CAHM3_A/I has a maximum clamping voltage (VC) of 41.5 V when subjected to its peak pulse current (IPPM) of 14.5 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88385 and reflects the actual voltage seen by protected circuitry during worst-case surge conditions. The low clamping ratio (VC/VBR ≈ 1.24) ensures effective protection of downstream components such as microcontrollers and transceivers.
Is SM6T30CAHM3_A/I qualified for automotive applications?
Yes, SM6T30CAHM3_A/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024, Doc. #88385). It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD verification - making it suitable for under-hood and ADAS-related sensor protection where reliability is mission-critical. The "HM3" designation explicitly denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction.
What does the "CA" suffix indicate in SM6T30CAHM3_A/I?
The "CA" suffix in SM6T30CAHM3_A/I designates a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both polarities. Unlike unidirectional variants (e.g., SM6T30A), this part has no cathode marking and exhibits identical electrical characteristics - VBR, VC, and ID - for positive and negative voltage excursions. This enables use on AC-coupled lines, differential buses, or floating grounds without polarity concerns.
What is the thermal resistance of SM6T30CAHM3_A/I from junction to ambient?
The typical thermal resistance from junction to ambient (RθJA) for SM6T30CAHM3_A/I is 100 °C/W, measured on a 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal, per Vishay document 88385. This value assumes standard SMB mounting conditions and is critical for calculating steady-state temperature rise under continuous power dissipation or repetitive surge duty cycles. For improved thermal performance, larger copper areas or internal layers may be used to reduce effective RθJA.
How does SM6T30CAHM3_A/I differ from SM6T30A in terms of electrical behavior?
SM6T30CAHM3_A/I is bidirectional with symmetrical VBR (33.3–37.1 V), VC (41.5 V), and leakage (≤1.0 μA) in both directions, while SM6T30A is unidirectional with cathode marking and forward conduction capability. The CA version lacks polarity marking and cannot conduct DC forward current - it only clamps transients above VBR in either polarity. This makes SM6T30CAHM3_A/I ideal for protecting AC signals or differential pairs, whereas SM6T30A suits DC power rail protection where polarity is fixed.
SM6T30CAHM3_A/I 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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.5V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T30CAHM3_A/I FAQ
1.How can I place an order for SM6T30CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T30CAHM3_A/I 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 SM6T30CAHM3_A/I reliable?
The price and inventory of SM6T30CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T30CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SM6T30CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T30CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T30CAHM3_A/I?
SM6T30CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T30CAHM3_A/I 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 SM6T30CAHM3_A/I?
For technical support, including SM6T30CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T30CAHM3_A/I requirements.
6.How does Aetrix verify that SM6T30CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T30CAHM3_A/I 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 SM6T30CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SM6T30CAHM3_A/I?
All SM6T30CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T30CAHM3_A/I, 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 SM6T30CAHM3_A/I part is unused and in its original packaging.
Return procedure for SM6T30CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T30CAHM3_A/I Tags
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