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Vishay General Semiconductor - Diodes Division SMB8J7.5CAHM3/H
- Part No.:
- SMB8J7.5CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J7.5CAHM3/H.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,640
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Product details
Overview
SMB8J7.5CAHM3/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 7.5 V stand-off voltage (VWM), 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 - ideal for automotive sensor interface and industrial I/O line protection.
For engineers reviewing the SMB8J7.5CAHM3/H datasheet, SMB8J7.5CAHM3/H pinout, SMB8J7.5CAHM3/H application, or SMB8J7.5CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
The SMB8J7.5CAHM3/H is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C reflow peak), and delivers stable clamping performance under repetitive surge stress when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 7.5 V - maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 8.33–9.21 V at 1.0 mA - voltage at which device enters avalanche breakdown; ensures reliable triggering above normal signal swing |
| VC (Clamping Voltage) | 12.9 V at IPPM = 200 A - maximum voltage seen by protected circuit during 10/1000 µs surge; determines downstream IC survivability |
| PPPM (Peak Pulse Power) | 800 W - energy-handling capacity for standardized 10/1000 µs transient; validates robustness against ISO 7637-2 Pulse 1/2/5a |
| IR (Reverse Leakage) | 1.0 µA max at VWM - negligible standby current; avoids signal distortion or battery drain in always-on systems |
| TJ max | +150 °C - enables operation in under-hood automotive environments and high-ambient industrial enclosures |
| AEC-Q101 Qualified | Yes - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). Mounting requires 5.0 mm × 5.0 mm copper pads per terminal for thermal and surge current handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Common node for bidirectional clamping | No functional polarity - symmetric structure allows either terminal to serve as anode/cathode depending on transient polarity |
| Anode (unmarked end) | Common node for bidirectional clamping | Identical electrical behavior to cathode terminal; device functions identically regardless of orientation in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines without external polarity management |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body electronics, and ADAS sensor interfaces requiring zero-failure field reliability |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental compliance mandates including JEDEC J-STD-201 Class 2 whisker resistance and UL 94 V-0 flammability |
| Low-profile SMB package | Supports high-density PCB layouts and automated pick-and-place with industry-standard DO-214AA footprint and reflow profile |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift in humid or condensing environments |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver signal pins and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed directly at connector entry point to limit transient voltage before it reaches sensitive analog front-end or communication ICs. Use Value: Maintains signal integrity below 12.9 V clamping level during 200 A surges, preventing latch-up or permanent damage to 5 V or 3.3 V interface ICs. |
Use Scenario: Safeguarding PLC digital input modules against ESD and relay-coil flyback spikes in factory automation control cabinets. IC Role / Device Role / Timing Role: Primary surge suppression element across 24 V DC input terminals, coordinated with upstream fuse and downstream filtering. Use Value: Absorbs 800 W transient energy without degradation, enabling >100,000 surge cycles per MIL-STD-883H Method 3015.7. |
| Telecom Line Interface | Consumer USB/Display Port ESD Protection |
Use Scenario: Shielding RS-485/RS-422 differential data lines in base station remote units exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, providing symmetrical clamping without disturbing differential signaling. Use Value: Clamps both polarities equally at ≤12.9 V, preserving signal eye diagram integrity and meeting ITU-T K.20 immunity requirements. |
Use Scenario: Board-level ESD protection for USB 2.0 D+/D− and DisplayPort AUX channels in laptops and docking stations. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical) bidirectional clamp placed immediately adjacent to connector to shunt ±8 kV contact discharge per IEC 61000-4-2. Use Value: Sub-1 ns response time prevents ESD pulse propagation into PHY ICs while adding <0.3 pF parasitic capacitance per line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J7.5CAHE3/H | Same electrical specs, but RoHS-compliant commercial grade (non-halogen-free); no JESD201 Class 2 whisker rating | Suitable for non-automotive industrial or consumer use where halogen-free mandate does not apply | Select SMB8J7.5CAHE3/H only if halogen-free certification is not required and cost optimization is prioritized |
| SMAJ7.5CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (90 °C/W), same VWM/VC | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or high-current industrial surges | Choose SMAJ7.5CA only for space-constrained designs with verified <400 W surge exposure and no AEC-Q101 requirement |
Compared with SMB8J7.5CAHE3/H, the SMB8J7.5CAHM3/H adds halogen-free compliance and whisker resistance for automotive use; versus SMAJ7.5CA, it delivers double the surge power rating and AEC-Q101 qualification - critical for under-hood and safety-critical systems.
Availability
SMB8J7.5CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer port-level ESD protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J7.5CAHM3/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMB8J7.5CAHM3/H belongs to Vishay's TRANSZORB® family of high-power TVS diodes, engineered specifically for robust transient suppression in harsh environments where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMB8J7.5CAHM3/H at its rated peak pulse current?
The SMB8J7.5CAHM3/H has a maximum clamping voltage (VC) of 12.9 V when subjected to its rated peak pulse current (IPPM) of 200 A using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry will not experience voltages exceeding 12.9 V during such transient events, ensuring compatibility with 5 V and 3.3 V logic interfaces.
Is SMB8J7.5CAHM3/H suitable for automotive applications?
Yes, SMB8J7.5CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance. It is explicitly intended for automotive use cases including engine control units, body electronics, and ADAS sensor modules where reliability under thermal cycling, humidity, and high-energy surges is essential.
How does the bidirectional configuration of SMB8J7.5CAHM3/H affect PCB layout?
The SMB8J7.5CAHM3/H has no polarity marking requirement for function - both terminals behave identically due to symmetric internal structure. This eliminates orientation constraints during placement, simplifies PCB routing for differential or AC-coupled signals, and removes risk of misassembly. The cathode band is present for traceability only and does not impact electrical operation.
What is the thermal resistance of SMB8J7.5CAHM3/H, and how does it impact power dissipation?
The SMB8J7.5CAHM3/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 72 °C/W when mounted on 5.0 mm × 5.0 mm copper pads. These values enable effective heat transfer during surge events, allowing the device to absorb 800 W pulses without exceeding its 150 °C maximum junction temperature - provided the PCB layout adheres to Vishay's recommended pad dimensions.
Can SMB8J7.5CAHM3/H replace unidirectional TVS diodes in existing designs?
SMB8J7.5CAHM3/H can replace unidirectional variants only if the circuit topology supports bidirectional clamping - for example, across floating or AC-coupled nodes. It must not be substituted in DC-biased unidirectional configurations (e.g., 5 V rail-to-ground) without verifying that reverse conduction during negative transients won't disrupt system operation or violate voltage tolerances of downstream components.
SMB8J7.5CAHM3/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):
- 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:
- 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)
SMB8J7.5CAHM3/H FAQ
1.How can I place an order for SMB8J7.5CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J7.5CAHM3/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 SMB8J7.5CAHM3/H reliable?
The price and inventory of SMB8J7.5CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J7.5CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMB8J7.5CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J7.5CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J7.5CAHM3/H?
SMB8J7.5CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J7.5CAHM3/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 SMB8J7.5CAHM3/H?
For technical support, including SMB8J7.5CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J7.5CAHM3/H requirements.
6.How does Aetrix verify that SMB8J7.5CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J7.5CAHM3/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 SMB8J7.5CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMB8J7.5CAHM3/H?
All SMB8J7.5CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J7.5CAHM3/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 SMB8J7.5CAHM3/H part is unused and in its original packaging.
Return procedure for SMB8J7.5CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J7.5CAHM3/H Tags
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