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Vishay General Semiconductor - Diodes Division SMB8J17CAHM3/H
- Part No.:
- SMB8J17CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J17CAHM3/H.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,227
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Product details
Overview
SMB8J17CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 17 V standoff voltage (VWM), 18.9–20.9 V breakdown range (VBR at 1 mA), 27.6 V clamping voltage at 29.0 A peak pulse current (10/1000 µs), and 800 W peak pulse power rating. It is AEC-Q101 qualified and halogen-free, targeting automotive sensor interface and power rail protection.
For engineers reviewing the SMB8J17CAHM3/H datasheet, SMB8J17CAHM3/H pinout, SMB8J17CAHM3/H application, or SMB8J17CAHM3/H equivalent, this page delivers verified electrical parameters, automotive-grade qualification status, clamping performance under standardized surge waveforms, and real-world use context for ESD and load-switching transient suppression in harsh environments.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling robust protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast, predictable clamping response to transients up to 29.0 A (10/1000 µs).
The device is rated for continuous operation from –55 °C to +150 °C junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance (RθJA = 72 °C/W) reflects optimized PCB pad layout requirements-0.2" × 0.2" copper pads per terminal-for reliable power dissipation during repetitive surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below breakdown. |
| VBR (min/max) | 18.9 V / 20.9 V at 1 mA - Confirmed breakdown threshold range; ensures consistent turn-on behavior across production lots. |
| VC @ IPPM | 27.6 V at 29.0 A (10/1000 µs) - Clamping voltage seen by protected circuit during worst-case surge; determines maximum stress on downstream ICs. |
| PPPM | 800 W - Peak pulse power handling capability; validates suitability for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | <1.0 µA - Reverse leakage at standoff voltage; critical for low-power sensor interfaces and battery-backed systems. |
| TJ max. | +150 °C - Maximum junction temperature; enables deployment in under-hood automotive modules and industrial motor drives. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Reference node for bidirectional conduction | No functional polarity marking on bidirectional devices; terminals are symmetrical-either lead may serve as anode or cathode depending on transient polarity. |
| Anode (unmarked end) | Reference node for bidirectional conduction | Identical electrical role to marked end; device conducts equally in both directions above VBR magnitude. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, LIN), and ungrounded power rails without polarity concerns. |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control units, ADAS sensors, and body electronics exposed to harsh thermal and vibration profiles. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure during surge events-critical for protecting 3.3 V or 5 V logic interfaces downstream of the TVS. |
| MSL Level 1 rating | Supports standard SMT reflow processes (peak 260 °C) without preconditioning, reducing manufacturing complexity and cost. |
| Glass-passivated junction | Ensures long-term parameter stability and low leakage drift over temperature and lifetime-essential for mission-critical automotive systems. |
Applications
| Automotive Sensor Interface | CAN Bus Protection |
|---|---|
|
Use Scenario: Protecting analog outputs of pressure, temperature, or position sensors in engine bay modules exposed to load-dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary surge shunt element placed directly at connector entry point, clamping transients before they reach precision ADC front-end or microcontroller GPIO. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 5a (75 V/300 ms) by limiting voltage to ≤27.6 V, preventing latch-up or damage to 5 V tolerant sensor signal conditioning ICs. |
Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TJA1044, SN65HVD256) against ESD and coupled noise in vehicle networking gateways. IC Role / Device Role / Timing Role: Bidirectional line protector on CAN_H/CAN_L differential pair, absorbing common-mode surges while preserving signal rise/fall times due to low capacitance. Use Value: Provides <1.0 µA leakage at 17 V standoff, avoiding bus bias shift; clamps ±27.6 V surges without distorting 1–5 Mbps CAN signaling integrity. |
| Industrial Power Supply Input | Consumer USB Port Protection |
|
Use Scenario: Front-end transient suppression on 24 V DC input rails of PLC I/O modules subjected to field-wiring inductive kickback and lightning-induced surges. IC Role / Device Role / Timing Role: First-line defense parallel to bulk input capacitor, diverting >800 W surge energy away from upstream DC/DC controllers and downstream regulators. Use Value: Withstands 29.0 A (10/1000 µs) pulses without degradation, meeting IEC 61000-4-5 Level 3 (1 kV line-earth) requirements when paired with appropriate series impedance. |
Use Scenario: Overvoltage protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs and portable media devices. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed adjacent to USB connector, suppressing ESD (IEC 61000-4-2 ±15 kV contact) and hot-swap transients. Use Value: Delivers sub-30 V clamping at 29 A with <1.0 µA leakage-preserving USB enumeration timing and preventing false disconnects during transient events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J17CAHE3/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant with brominated flame retardants (non-halogen-free). | Acceptable for commercial/industrial designs where halogen-free material compliance is not mandated (e.g., non-automotive CE-marked equipment). | Select SMB8J17CAHE3/H if halogen content is unrestricted and cost optimization is prioritized over automotive material traceability. |
| SMAJ17CA | Same VWM (17 V) and bidirectional function, but lower PPPM (400 W) and smaller SMA (DO-214AC) package (RθJA = 95 °C/W). | Limited to lower-energy transients (e.g., IEC 61000-4-2 only); unsuitable for ISO 7637-2 or high-repetition industrial surges. | Choose SMAJ17CA only for space-constrained consumer applications with verified low-surge-risk environments and no automotive qualification requirement. |
Compared with SMB8J17CAHE3/H, the SMB8J17CAHM3/H offers identical surge performance with halogen-free construction required for automotive OEM compliance; versus SMAJ17CA, it delivers double the pulse power rating and superior thermal management-enabling robust protection in demanding automotive and industrial settings where sustained surge resilience is mandatory.
Availability
SMB8J17CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, CAN bus hardening, industrial 24 V power input stages, and USB port surge suppression requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J17CAHM3/H 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 density, and automotive-grade validation.
The SMB8JxxCA series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive and industrial environments where AEC-Q101 qualification, low clamping voltage, and thermal robustness are mandatory.
FAQ
What is the clamping voltage of SMB8J17CAHM3/H under a 10/1000 µs surge?
The SMB8J17CAHM3/H clamps to a maximum of 27.6 V when subjected to its rated peak pulse current of 29.0 A using the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for downstream 3.3 V or 5 V ICs. The SMB8J17CAHM3/H maintains this clamping performance across its full operating temperature range.
Is SMB8J17CAHM3/H suitable for automotive applications?
Yes, SMB8J17CAHM3/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials-meeting stringent automotive reliability requirements for under-hood and chassis-mounted electronics. Its 150 °C maximum junction temperature, MSL Level 1 reflow rating, and validated performance under ISO 7637-2 transients make it appropriate for engine control, ADAS sensor interfaces, and body control modules. The SMB8J17CAHM3/H carries the HM3 suffix explicitly denoting automotive-grade qualification.
How does SMB8J17CAHM3/H differ from unidirectional variants like SMB10J17A?
The SMB8J17CAHM3/H is bidirectional with symmetrical clamping in both polarities, whereas SMB10J17A is unidirectional and conducts only in reverse bias. SMB8J17CAHM3/H has a lower peak pulse power rating (800 W vs. 1000 W) and reduced peak surge current (29.0 A vs. 36.2 A), reflecting its dual-path conduction architecture. It also features a different marking code (1BR) and is optimized for AC-coupled or differential signal protection-unlike SMB10J17A, which suits DC power rail applications.
What is the standoff voltage (VWM) and why is it important for SMB8J17CAHM3/H?
The standoff voltage (VWM) of SMB8J17CAHM3/H is 17 V-the maximum continuous reverse voltage it can block without significant leakage (<1.0 µA). This parameter defines the safe operating margin between normal system voltage and the onset of clamping, ensuring no interference with nominal 12 V or 24 V automotive circuits. Selecting a VWM ≥1.1× the system's maximum steady-state voltage prevents false triggering while maintaining headroom for transients. For SMB8J17CAHM3/H, 17 V VWM aligns precisely with 12 V nominal systems with 20 % tolerance.
Does SMB8J17CAHM3/H require special PCB layout considerations?
Yes-Vishay specifies that SMB8J17CAHM3/H must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve its rated 800 W pulse power and thermal resistance (RθJA = 72 °C/W). Smaller pads increase junction temperature during surge events, risking parametric shift or failure. Additionally, short, direct traces to the protected node and ground plane minimize inductance, preserving clamping speed. These layout rules are validated in the SMB8J17CAHM3/H datasheet Figure 2 and thermal characterization data.
SMB8J17CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 29A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J17CAHM3/H FAQ
1.How can I place an order for SMB8J17CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J17CAHM3/H 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 SMB8J17CAHM3/H reliable?
The price and inventory of SMB8J17CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J17CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMB8J17CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J17CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J17CAHM3/H?
SMB8J17CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J17CAHM3/H 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 SMB8J17CAHM3/H?
For technical support, including SMB8J17CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J17CAHM3/H requirements.
6.How does Aetrix verify that SMB8J17CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J17CAHM3/H 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 SMB8J17CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMB8J17CAHM3/H?
All SMB8J17CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J17CAHM3/H, 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 SMB8J17CAHM3/H part is unused and in its original packaging.
Return procedure for SMB8J17CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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