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Vishay General Semiconductor - Diodes Division SMB8J24CAHE3_B/I
- Part No.:
- SMB8J24CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J24CAHE3_B/I.pdf
- Description:
- 800W,24V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,772
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Product details
Overview
SMB8J24CAHE3_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 24 V stand-off voltage (VWM), 38.9 V maximum clamping voltage (VC) at 20.6 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 SMB8J24CAHE3_B/I datasheet, SMB8J24CAHE3_B/I pinout, SMB8J24CAHE3_B/I application, or SMB8J24CAHE3_B/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low leakage (<1.0 µA at VWM), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response to ESD and lightning-induced transients. Its bidirectional architecture enables symmetrical clamping across both polarities without external polarity management, supporting robust protection of differential buses and AC-coupled lines.
Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, enabling sustained operation up to TJ = 150 °C. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing, confirming suitability for lead-free reflow and automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 26.7 V / 29.5 V - Breakdown occurs within this range at 1.0 mA test current; ensures predictable turn-on threshold across temperature and lot variation. |
| VC @ IPPM | 38.9 V - Clamped voltage at 20.6 A peak pulse current (10/1000 µs); limits downstream IC stress during 800 W surge events. |
| PPPM | 800 W - Peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| ID @ VWM | <1.0 µA - Reverse leakage at 24 V; minimizes standby power loss and avoids false triggering in high-impedance sensor circuits. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive ECUs and industrial motor drives with elevated ambient conditions. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing; required for ASIL-B/C system components. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetric terminals suitable for AC line or differential pair protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional avalanche junction | No designated anode/cathode; either terminal serves as clamping path depending on transient polarity - eliminates orientation constraints during PCB layout. |
| Lead 1 | Terminal A | Matte tin-plated, solderable per J-STD-002; compatible with lead-free reflow profiles up to 260 °C peak. |
| Lead 2 | Terminal B | Same metallization and thermal interface as Lead 1; supports balanced current sharing during bipolar surges. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics including engine control, ADAS sensors, and body modules - meets lifetime reliability requirements for 15+ year service life. |
| 800 W peak pulse power (bidirectional) | Enables single-device protection against IEC 61000-4-5 4 kV surge on 24 V supply rails without derating or parallel staging. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage exposure to protected ICs - critical for safeguarding 3.3 V or 5 V logic interfacing with 24 V field wiring. |
| MSL Level 1, 260 °C peak | Supports standard SMT reflow without moisture sensitivity concerns - eliminates baking requirement and reduces assembly cost. |
| Glass-passivated junction | Ensures stable breakdown characteristics and long-term parameter stability under thermal cycling and humidity exposure. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protection of CAN/LIN transceiver I/O pins and analog sensor feeds (e.g., pressure, temperature) in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting transient energy before it reaches front-end op-amps or ADC drivers. Use Value: Maintains signal integrity during 100 V/50 ms load dump events while holding clamped voltage below 40 V - preventing latch-up in 5 V tolerant receivers. |
Use Scenario: Guarding 4–20 mA current loop inputs and ±10 V analog inputs in programmable logic controllers subjected to field wiring surges and ESD. IC Role / Device Role / Timing Role: Fast-response shunt element that diverts >20 A surge current away from precision instrumentation amplifiers. Use Value: Achieves <1.0 µA leakage at 24 V supply, avoiding offset drift in µV-level measurement circuits while surviving repeated 1 kV/500 Ω surges. |
| Telecom Power Feeds | Consumer Appliance Motor Control |
Use Scenario: Surge suppression on -48 V DC telecom power distribution boards where lightning-induced common-mode transients exceed 1 kV. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input stage, coordinated with upstream MOVs and downstream DC-DC converters. Use Value: 800 W rating allows single-device handling of combined differential + common-mode surges without thermal runaway - validated per GR-1089-CORE. |
Use Scenario: Protecting microcontroller GPIOs and gate drivers in washing machine motor inverters exposed to back-EMF spikes from brushed DC motors. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) shunt suppressor placed directly at connector entry point. Use Value: Sub-ns response time prevents gate oxide damage in 600 V MOSFETs during 100 A inductive turn-off events - verified per IEC 61000-4-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J24CAHM3_B/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated by OEM environmental policy. | Direct substitution if halogen-free bill-of-materials is required; same footprint, thermal, and electrical behavior. |
| SMAJ24CAHE3_A/H | Lower PPPM (400 W), smaller SMA (DO-214AC) package, same VWM/VC but reduced IPPM (10.3 A). | Suitable only for lower-energy threats (e.g., IEC 61000-4-2 ESD), not full IEC 61000-4-5 Level 4 surge. | Choose when space-constrained layouts prohibit SMB size and surge threat level is limited to ESD or low-energy switching noise. |
Compared with SMB8J24CAHE3_B/I, the HM3 variant offers identical protection performance with halogen-free construction, while the SMAJ24CAHE3_A/H trades 50 % pulse power for 30 % smaller footprint - making SMB8J24CAHE3_B/I optimal for automotive and industrial applications demanding full 800 W surge resilience.
Availability
SMB8J24CAHE3_B/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power systems, and consumer appliance motor controls requiring stable component supply with AEC-Q101 assurance and long-term lifecycle support.
Supply support for SMB8J24CAHE3_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, power density, and automotive qualification.
The SMB8JxxCA series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, bidirectional surge protection in harsh-environment applications including automotive, industrial automation, and telecommunications infrastructure.
FAQ
What is the clamping voltage of SMB8J24CAHE3_B/I at its rated peak pulse current?
The SMB8J24CAHE3_B/I exhibits a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current (IPPM) of 20.6 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees controlled overvoltage limiting during standardized surge events - critical for protecting downstream 3.3 V or 5 V logic interfaces connected to 24 V field wiring. The SMB8J24CAHE3_B/I maintains this performance across its full operating temperature range.
Is SMB8J24CAHE3_B/I suitable for automotive applications?
Yes, SMB8J24CAHE3_B/I is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, ADAS sensor modules, and body electronics. Its construction includes glass-passivated junction, MSL Level 1 moisture sensitivity, and JESD201 Class 2 whisker resistance - all validated per automotive reliability standards. The SMB8J24CAHE3_B/I also supports lead-free reflow up to 260 °C and operates from –55 °C to +150 °C junction temperature.
How does the bidirectional design of SMB8J24CAHE3_B/I affect PCB layout?
The SMB8J24CAHE3_B/I has no polarity marking and functions identically regardless of terminal orientation, simplifying PCB layout for AC-coupled lines, differential buses (e.g., RS-485), or unidirectional lines where polarity reversal risk exists. Unlike unidirectional TVS diodes, it eliminates the need for cathode-band alignment checks during automated placement - reducing assembly defects and enabling direct placement across signal pairs without directional constraints. This symmetry is intrinsic to the SMB8J24CAHE3_B/I's internal structure.
What is the maximum reverse leakage current for SMB8J24CAHE3_B/I at its stand-off voltage?
The SMB8J24CAHE3_B/I specifies a maximum reverse leakage current (ID) of 1.0 µA at its 24 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor circuits and avoids loading effects on precision analog front-ends. Leakage remains below 5 µA up to +125 °C ambient, ensuring stable performance in under-hood automotive environments where the SMB8J24CAHE3_B/I is commonly deployed.
Can SMB8J24CAHE3_B/I be used in place of a unidirectional TVS diode?
SMB8J24CAHE3_B/I is bidirectional and should not replace a unidirectional TVS diode in DC-biased circuits where forward conduction must be blocked - for example, on positive-only supply rails where forward current could cause latch-up or excessive power dissipation. However, it is fully suitable for AC lines, differential data paths, or dual-rail systems. Always verify circuit topology: the SMB8J24CAHE3_B/I clamps both polarities equally, unlike unidirectional variants which conduct only in reverse.
SMB8J24CAHE3_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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 24V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- 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)
SMB8J24CAHE3_B/I FAQ
1.How can I place an order for SMB8J24CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J24CAHE3_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 SMB8J24CAHE3_B/I reliable?
The price and inventory of SMB8J24CAHE3_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 SMB8J24CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J24CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J24CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J24CAHE3_B/I?
SMB8J24CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J24CAHE3_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 SMB8J24CAHE3_B/I?
For technical support, including SMB8J24CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J24CAHE3_B/I requirements.
6.How does Aetrix verify that SMB8J24CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J24CAHE3_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 SMB8J24CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J24CAHE3_B/I?
All SMB8J24CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J24CAHE3_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 SMB8J24CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMB8J24CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J24CAHE3_B/I Tags
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