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Vishay General Semiconductor - Diodes Division SMB8J17CAHM3_B/I
- Part No.:
- SMB8J17CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J17CAHM3_B/I.pdf
- Description:
- 800W,17V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,924
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Product details
Overview
SMB8J17CAHM3_B/I 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), 27.6 V clamping voltage (VC) at 29.0 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - used to protect automotive sensor interfaces, CAN transceivers, and industrial I/O ports against ESD and load dump.
For engineers reviewing the SMB8J17CAHM3_B/I datasheet, SMB8J17CAHM3_B/I pinout, SMB8J17CAHM3_B/I application, or SMB8J17CAHM3_B/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.62), MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transients exceeding its reverse standoff voltage (VWM = 17 V). Its bidirectional architecture enables symmetrical clamping for AC-coupled or floating lines without polarity concerns.
It delivers 800 W peak pulse power handling under 10/1000 µs waveform, with thermal resistance of 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling robust operation up to TJ = +150 °C in compact PCB layouts using 5.0 mm × 5.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown |
| VBR min/max | 18.9 V / 20.9 V at 1 mA - verified breakdown threshold ensures predictable turn-on during overvoltage events |
| VC @ IPPM | 27.6 V at 29.0 A - clamping voltage limits downstream IC stress during 800 W surge; clamping ratio = 1.62 |
| PPPM | 800 W (10/1000 µs) - energy-handling capacity suitable for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 |
| IR @ VWM | 1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor circuits |
| TJ max | +150 °C - supports under-hood automotive placement and industrial ambient conditions |
| AEC-Q101 | Qualified - validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads, MSL Level 1 (260 °C peak reflow), 5.59 mm × 4.06 mm × 2.20 mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Transient return path (bidirectional) | Marked end denotes cathode for unidirectional variants; no marking on SMB8J17CAHM3_B/I - symmetric terminals enable orientation-agnostic placement |
| Cathode (Opposite Band Side) | Transient return path (bidirectional) | Electrically identical to anode in bidirectional configuration; both terminals conduct equally during positive/negative surges |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), and floating power rails without polarity constraints |
| AEC-Q101 qualification | Validated reliability for automotive ECUs, ADAS sensors, and body control modules requiring long-term field stability |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot across protected ICs - critical for 3.3 V/5 V logic and automotive MCU I/O pins |
| MSL Level 1 rating | Eliminates bake-out requirement prior to SMT assembly; compatible with standard lead-free reflow profiles up to 260 °C peak |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive OEM environmental mandates and simplifies end-of-life recycling compliance |
Applications
| Automotive Sensor Interface | CAN Bus Protection |
|---|---|
Use Scenario: Protecting temperature, pressure, and position sensors connected to vehicle chassis ground in engine bay environments. IC Role / Device Role / Timing Role: Shunt-based transient suppressor placed between sensor signal line and ground, activated only during >17 V surges. Use Value: Prevents latch-up or gate oxide damage in analog front-end amplifiers and ADC inputs during ISO 7637-2 load dump pulses. | Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TCAN1042, SN65HVD256) on 12 V vehicle networks. IC Role / Device Role / Timing Role: Bidirectional voltage clamp on CAN_H/CAN_L differential pair, limiting common-mode transients to <27.6 V. Use Value: Maintains bus integrity during ESD events (IEC 61000-4-2 ±8 kV contact) and prevents transceiver shutdown or data corruption. |
| Industrial PLC I/O Module | Smart Meter Communication Port |
Use Scenario: Shielding 24 V DC digital input channels in programmable logic controllers exposed to relay coil flyback and motor noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each input channel, placed upstream of optocoupler or Schmitt trigger input stage. Use Value: Absorbs 800 W surges without degradation, ensuring >100,000 switching cycles with stable leakage (<1 µA) and no parameter drift. | Use Scenario: Securing RS-485 or HPLC communication lines in electricity meters installed in outdoor utility cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS on differential data lines, coordinated with common-mode chokes to meet IEC 61000-4-5 Level 3 (1 kV line-earth). Use Value: Clamps induced lightning surges to safe levels while preserving signal rise time due to low junction capacitance (<100 pF at 0 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J17CAHE3_B/I | RoHS-compliant but not halogen-free; lacks HM3 environmental certification | Acceptable for commercial/industrial use where halogen-free mandate does not apply | Select when cost sensitivity outweighs automotive or green procurement requirements |
| SMAJ17CA | Lower PPPM (400 W), larger SMA package (DO-214AC), higher RθJA (110 °C/W) | Not suitable for high-density automotive PCBs or sustained surge duty cycles | Choose only for legacy designs with existing SMA footprints and lower energy threat profiles |
Compared with SMB8J17CAHM3_B/I, the HE3 variant trades halogen-free compliance for slightly lower cost, while the SMAJ17CA sacrifices 50 % surge power rating and thermal performance - making SMB8J17CAHM3_B/I the optimal choice for AEC-Q101–mandated, space-constrained, high-reliability applications.
Availability
SMB8J17CAHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor protection, CAN bus hardening, and industrial I/O conditioning requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMB8J17CAHM3_B/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, AEC-Q101–qualified transient suppression in automotive and harsh-environment industrial systems.
FAQ
What is the clamping voltage of SMB8J17CAHM3_B/I at its rated peak pulse current?
The SMB8J17CAHM3_B/I has a maximum clamping voltage (VC) of 27.6 V when subjected to its specified peak pulse current (IPPM) of 29.0 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected circuitry remains below critical voltage thresholds during surge events. The SMB8J17CAHM3_B/I maintains this clamping performance across its qualified operating temperature range of -55 °C to +150 °C.
Is SMB8J17CAHM3_B/I suitable for automotive applications?
Yes, SMB8J17CAHM3_B/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HM3 suffix), making it suitable for automotive applications including engine control units, ADAS sensors, and body electronics. Its bidirectional architecture, 800 W surge rating, and MSL Level 1 reflow compatibility align with OEM requirements for under-hood and chassis-mounted systems. The SMB8J17CAHM3_B/I meets ISO 7637-2 and IEC 61000-4-5 immunity standards when properly laid out.
How does the SMB8J17CAHM3_B/I differ from unidirectional variants like SMB10J17A?
The SMB8J17CAHM3_B/I is bidirectional with symmetrical clamping for AC or floating lines, whereas SMB10J17A is unidirectional and conducts only in reverse bias. SMB8J17CAHM3_B/I offers 800 W PPPM and 29.0 A IPPM, while SMB10J17A provides 1000 W PPPM and 36.2 A IPPM but requires correct polarity orientation. The SMB8J17CAHM3_B/I's VWM (17 V) matches SMB10J17A's, but its VC (27.6 V) is identical - enabling direct functional comparison in differential or dual-rail protection schemes.
What is the thermal resistance of SMB8J17CAHM3_B/I, and how does it affect PCB layout?
SMB8J17CAHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W. To achieve rated power dissipation, the device must be mounted on minimum 5.0 mm × 5.0 mm copper pads per terminal, as specified in Vishay's recommended pad layout. Reducing pad area increases thermal impedance, derating surge capability - so PCB layout directly determines whether SMB8J17CAHM3_B/I sustains full 800 W performance in real-world thermal conditions.
Does SMB8J17CAHM3_B/I require orientation-specific placement on the PCB?
No, SMB8J17CAHM3_B/I does not require orientation-specific placement because it is a bidirectional TVS diode with identical electrical behavior on both terminals. Unlike unidirectional variants marked with a cathode band, SMB8J17CAHM3_B/I has no polarity marking - enabling automated pick-and-place without vision alignment and eliminating risk of reverse installation. This symmetry simplifies layout and improves manufacturing yield in high-volume automotive production.
SMB8J17CAHM3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 17V
- 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_B/I FAQ
1.How can I place an order for SMB8J17CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J17CAHM3_B/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 SMB8J17CAHM3_B/I reliable?
The price and inventory of SMB8J17CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J17CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J17CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J17CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J17CAHM3_B/I?
SMB8J17CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J17CAHM3_B/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 SMB8J17CAHM3_B/I?
For technical support, including SMB8J17CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J17CAHM3_B/I requirements.
6.How does Aetrix verify that SMB8J17CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J17CAHM3_B/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 SMB8J17CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J17CAHM3_B/I?
All SMB8J17CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J17CAHM3_B/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 SMB8J17CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMB8J17CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J17CAHM3_B/I Tags
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Diodes Incorporated
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