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Vishay General Semiconductor - Diodes Division SMB8J7.5CAHE3_A/I
- Part No.:
- SMB8J7.5CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J7.5CAHE3_A/I.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,897
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Product details
Overview
SMB8J7.5CAHE3_A/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 7.5 V stand-off voltage (VWM), 8.33–9.21 V breakdown voltage (VBR) at 1.0 mA, 12.9 V clamping voltage (VC) at 200 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J7.5CAHE3_A/I datasheet, SMB8J7.5CAHE3_A/I pinout, SMB8J7.5CAHE3_A/I application, or SMB8J7.5CAHE3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector, responding to transients within picoseconds by avalanche breakdown across its symmetric PN junction. Its bidirectional structure enables suppression of both positive and negative polarity surges without polarity dependency, making it suitable for AC-coupled or floating signal lines.
Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, with maximum junction temperature rated at +150 °C. It meets ANSI/IEEE C62.35 surge standards and is qualified per AEC-Q101 for automotive underhood and chassis applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5 V - Maximum continuous reverse operating voltage before clamping begins; ensures no leakage interference with 5 V or 3.3 V logic signaling. |
| VBR min/max | 8.33 V / 9.21 V at IT = 1.0 mA - Tight breakdown tolerance (±5.3%) guarantees consistent turn-on across production lots. |
| VC @ IPPM | 12.9 V at 200 A - Clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 1/2a/5a events in automotive systems. |
| PPPM | 800 W (10/1000 µs) - Supports robust protection against lightning-induced surges per IEC 61000-4-5 Level 3 (1 kV/2 Ω). |
| ID @ VWM | 1.0 µA - Ultra-low leakage preserves battery life in always-on automotive modules and sensor nodes. |
| TJ max | +150 °C - Enables operation in engine control units (ECUs), transmission control modules (TCMs), and under-hood ADAS sensors. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. No polarity marking - bidirectional symmetry eliminates orientation concerns during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; connects across protected line and ground (or between differential lines) without directional constraint. |
| Case (body) | Thermal and mechanical interface | Exposed metal slug provides thermal path to PCB copper; requires minimum 5.0 mm × 5.0 mm pad per terminal per datasheet fig. 2 derating curve. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for CAN/LIN bus protection in Tier-1 ECUs. |
| MSL Level 1 | Unlimited floor life at ≤30 °C/60% RH; supports standard reflow without baking - reduces manufacturing overhead in high-volume SMT lines. |
| Glass passivated junction | Stable VBR over lifetime and temperature; prevents parameter drift in humid or chemically aggressive under-hood environments. |
| Low incremental surge resistance | Enables tighter VC/VBR ratio (1.45) vs. competing TVS diodes - improves margin for 12 V rail protection in ADAS camera modules. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine control modules subject to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Shunt-type transient clamp placed between signal line and chassis ground, activated only during overvoltage events >7.5 V. Use Value: Prevents latch-up or gate oxide damage in 3.3 V/5 V microcontrollers and analog front-ends during ISO 7637-2 Pulse 5a (75 V/100 ms) events. | Use Scenario: Safeguarding PLC digital input cards connected to 24 V DC field wiring exposed to relay coil flyback and ESD from operator touch. IC Role / Device Role / Timing Role: Bidirectional voltage limiter across input channel and common reference, absorbing ±1 kV contact discharge per IEC 61000-4-2. Use Value: Maintains functional safety integrity without requiring external series impedance or direction-specific layout - reduces BOM count by eliminating dual unidirectional devices. |
| Automotive Camera Module Power Rail | USB-C Port ESD Protection |
Use Scenario: Clamping 12 V supply rail transients in surround-view camera modules mounted near motors and solenoids. IC Role / Device Role / Timing Role: Parallel-connected TVS on main power input, conducting surge energy to ground while holding rail voltage below 13 V during 10/1000 µs pulses. Use Value: Ensures uninterrupted image capture during cranking transients (ISO 16750-2) by limiting voltage excursion to <12.9 V at 200 A peak. | Use Scenario: Secondary-level ESD protection on USB-C CC and VBUS lines in automotive infotainment head units. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp placed after primary polymer PTC, handling residual 8 kV/15 kV contact/air discharge per IEC 61000-4-2. Use Value: Complements integrated USB-C controller ESD diodes by providing higher energy absorption (800 W vs. typical 100 W on-die), preventing system reset or port lockup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J7.5CAHM3_A/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy (e.g., VW TL 813). | Choose SMB8J7.5CAHM3_A/I if halogen-free materials are contractually required; otherwise SMB8J7.5CAHE3_A/I offers standard RoHS compliance at lower cost. |
| SMAJ7.5CAHE3/A | Same VWM/VBR/VC ratings but in smaller SMA (DO-214AC) package; PPPM = 400 W (10/1000 µs), IPPM = 100 A. | Limited to lower-energy threats (e.g., board-level ESD only); unsuitable for ISO 7637-2 Pulse 5a or lightning surges. | Select SMAJ7.5CAHE3/A only for space-constrained consumer electronics where 400 W surge rating suffices; avoid in automotive or industrial mains-connected systems. |
Compared with SMB8J7.5CAHE3_A/I, SMB8J7.5CAHM3_A/I delivers identical protection performance with halogen-free construction, while SMAJ7.5CAHE3/A trades 50% peak power and surge current for 30% smaller footprint - making SMB8J7.5CAHE3_A/I the optimal balance of automotive-grade ruggedness, manufacturability, and regulatory compliance.
Availability
SMB8J7.5CAHE3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and USB-C port surge suppression requiring stable component supply across multi-year production programs.
Supply support for SMB8J7.5CAHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on high-reliability and automotive-qualified solutions.
The SMB8Jx.xCAHE3 family is engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - targeting powertrain, body electronics, and ADAS subsystems where failure resilience is critical.
FAQ
What is the clamping voltage of SMB8J7.5CAHE3_A/I at its rated peak pulse current?
The SMB8J7.5CAHE3_A/I has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current (IPPM) of 200 A using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream circuitry remains within safe operating limits during surge events. The SMB8J7.5CAHE3_A/I maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMB8J7.5CAHE3_A/I suitable for bidirectional signal line protection?
Yes, SMB8J7.5CAHE3_A/I is explicitly designed as a bidirectional TVS diode, enabling symmetrical clamping of both positive and negative transients without polarity constraints. Its DO-214AA package has no cathode band marking, confirming its bidirectional nature. Engineers use SMB8J7.5CAHE3_A/I on differential buses like LIN, CAN FD, and RS-485 where signal inversion or AC coupling demands non-polarized protection - unlike unidirectional variants such as SMB10J7.5A.
Does SMB8J7.5CAHE3_A/I meet automotive qualification standards?
Yes, SMB8J7.5CAHE3_A/I is AEC-Q101 qualified and manufactured with automotive-grade process controls. It passes stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JS-001. The "HE3" suffix denotes RoHS-compliant construction with AEC-Q101 qualification, and the "_A/I" ordering code specifies 13-inch tape-and-reel packaging compatible with high-speed pick-and-place equipment used in Tier-1 automotive electronics assembly.
What is the thermal resistance of SMB8J7.5CAHE3_A/I, and how does it affect PCB layout?
SMB8J7.5CAHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W. To maintain safe junction temperatures under repeated surges, Vishay specifies mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad area increases thermal impedance, derating peak power - so PCB layout must strictly follow the recommended pad dimensions in the SMB8J7.5CAHE3_A/I datasheet figure 2.
How does SMB8J7.5CAHE3_A/I compare to unidirectional TVS diodes with the same VWM?
SMB8J7.5CAHE3_A/I provides bidirectional clamping at 7.5 V stand-off, whereas unidirectional equivalents like SMB10J7.5A offer only single-polarity protection and require correct orientation during placement. The SMB8J7.5CAHE3_A/I's symmetric structure simplifies layout, eliminates polarity verification in automated assembly, and supports AC-coupled or floating lines - but trades 200 W peak pulse power (800 W vs. 1000 W) versus the unidirectional SMB10J7.5A due to internal construction differences.
SMB8J7.5CAHE3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 62A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J7.5CAHE3_A/I FAQ
1.How can I place an order for SMB8J7.5CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J7.5CAHE3_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 SMB8J7.5CAHE3_A/I reliable?
The price and inventory of SMB8J7.5CAHE3_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 SMB8J7.5CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J7.5CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J7.5CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J7.5CAHE3_A/I?
SMB8J7.5CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J7.5CAHE3_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 SMB8J7.5CAHE3_A/I?
For technical support, including SMB8J7.5CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J7.5CAHE3_A/I requirements.
6.How does Aetrix verify that SMB8J7.5CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J7.5CAHE3_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 SMB8J7.5CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J7.5CAHE3_A/I?
All SMB8J7.5CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J7.5CAHE3_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 SMB8J7.5CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMB8J7.5CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J7.5CAHE3_A/I Tags
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