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Vishay General Semiconductor - Diodes Division SMB8J24CAHE3_A/H
- Part No.:
- SMB8J24CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J24CAHE3_A/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,072
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Product details
Overview
SMB8J24CAHE3_A/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 24 V stand-off voltage (VWM), 26.7–29.5 V breakdown voltage (VBR), 38.9 V 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_A/H datasheet, SMB8J24CAHE3_A/H pinout, SMB8J24CAHE3_A/H application, or SMB8J24CAHE3_A/H equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping behavior, low leakage (<1.0 μA at VWM), thermal resistance (RθJA = 72 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, while the bidirectional configuration enables symmetrical clamping across both polarities without external polarity management.
The device is rated for -55 °C to +150 °C operating junction temperature and meets MSL level 1 per J-STD-020 (260 °C peak reflow). Its AEC-Q101 qualification confirms suitability for automotive under-hood and chassis-mounted electronics where reliability under thermal cycling and mechanical stress is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 26.7 V / 29.5 V at 1.0 mA - guaranteed breakdown threshold range ensures consistent turn-on across production lots. |
| VC @ IPPM | 38.9 V at 20.6 A - clamping voltage limits downstream IC stress during 800 W transient events (10/1000 μs). |
| PPPM | 800 W - peak pulse power handling capacity determines survivability against ISO 7637-2 Pulse 1/2/5a surges in automotive environments. |
| ID @ VWM | <1.0 μA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in always-on circuits. |
| RθJA | 72 °C/W - thermal resistance informs PCB pad design; requires ≥5.0 mm × 5.0 mm copper per terminal for full derating. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per AEC standard. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Anode) | Transient current return path | Both terminals function identically in bidirectional mode; current flows from either terminal to the other during overvoltage events. |
| Anode (Cathode) | Transient current return path | No functional distinction between terminals; layout symmetry eliminates orientation constraints during placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity awareness or external diodes. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and body electronics requiring long-term field reliability. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage over temperature and lifetime, critical for precision voltage thresholding. |
| MSL Level 1 rating | Supports standard lead-free reflow profiles up to 260 °C peak without preconditioning, simplifying manufacturing flow. |
| Low-profile SMB package | 0.130" × 0.155" footprint (3.30 mm × 3.94 mm) saves board space while maintaining 800 W surge capability. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/FlexRay transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive kickback in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector or IC pin to clamp surges before they reach sensitive front-end circuitry. Use Value: Limits voltage excursion to ≤38.9 V during 800 W transients, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring surges caused by relay coil de-energization or lightning-induced coupling. IC Role / Device Role / Timing Role: Primary line-level surge arrestor mounted at terminal block entry point, upstream of optocoupler or Schmitt trigger input stages. Use Value: Absorbs 20.6 A peak current (10/1000 μs) without degradation, enabling compliance with IEC 61000-4-5 Level 3 (2 kV/12 Ω) immunity testing. |
| Telecom Line Card Protection | Consumer Power Adapter Feedback Loop |
Use Scenario: Guarding Ethernet PHY magnetics and PoE controller pins against ESD and fast transients in enterprise switch line cards. IC Role / Device Role / Timing Role: Secondary protection device after gas discharge tube (GDT), providing low-clamp refinement for sub-nanosecond ESD events. Use Value: Responds in <1 ps to ±8 kV contact ESD (IEC 61000-4-2), limiting voltage seen by PHY to safe levels while maintaining signal integrity. |
Use Scenario: Stabilizing optocoupler feedback path in isolated AC/DC adapters subject to mains-borne surges and transformer ringing. IC Role / Device Role / Timing Role: Clamping diode across secondary-side error amplifier output to prevent overvoltage saturation during transient overload conditions. Use Value: Maintains regulation loop stability by clamping feedback node to ≤38.9 V, avoiding false overvoltage shutdown in UCC287xx-family controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J24CA-E3/52 | Same electrical specs and SMB package; RoHS-compliant commercial grade, not AEC-Q101 qualified. | Lacks automotive qualification; suitable for industrial/commercial designs without automotive reliability requirements. | Select when AEC-Q101 is not mandated and cost optimization is prioritized over automotive validation. |
| SMAJ24CAHE3_A/H | Same VWM/VBR/VC ratings but in smaller SMA (DO-214AC) package; lower PPPM (400 W) and IPPM (10.3 A). | Insufficient for 800 W surge events; limited to lower-energy interfaces like USB or UART lines. | Choose only for space-constrained non-automotive applications where 400 W surge rating suffices. |
Compared with SMB8J24CAHE3_A/H, SMB8J24CA-E3/52 offers identical protection performance without automotive qualification, while SMAJ24CAHE3_A/H trades surge capacity for footprint reduction - making SMB8J24CAHE3_A/H the sole option meeting AEC-Q101 + 800 W in SMB form factor.
Availability
SMB8J24CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and telecom line card surge immunity requiring stable component supply and AEC-Q101 traceability.
Supply support for SMB8J24CAHE3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and power efficiency.
The SMB8JxxCA series targets high-reliability transient suppression in automotive and industrial systems, engineered specifically to meet AEC-Q101 and IEC 61000-4-5 requirements with minimal board space.
FAQ
What is the clamping voltage of SMB8J24CAHE3_A/H at its rated peak pulse current?
The SMB8J24CAHE3_A/H has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current (IPPM) of 20.6 A using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry remains below critical voltage thresholds during surge events. The SMB8J24CAHE3_A/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMB8J24CAHE3_A/H suitable for automotive applications?
Yes, SMB8J24CAHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix, confirming validation for temperature cycling, highly accelerated life testing, and ESD robustness. It is deployed in engine control units, ADAS camera modules, and body control modules where sustained operation at 150 °C junction temperature and immunity to load dump transients are required. The SMB8J24CAHE3_A/H meets all stress test requirements defined in the AEC-Q101 standard.
What is the difference between SMB8J24CAHE3_A/H and SMB10J24AHE3_A/H?
SMB8J24CAHE3_A/H is bidirectional with 800 W peak pulse power and 20.6 A IPPM, while SMB10J24AHE3_A/H is unidirectional with 1000 W PPPM and 25.7 A IPPM. The "C" in SMB8J24CAHE3_A/H denotes bidirectional configuration; the "A" in SMB10J24AHE3_A/H indicates unidirectional. Both share identical VWM (24 V), VBR (26.7–29.5 V), and VC (38.9 V), but differ in polarity handling and surge rating - SMB8J24CAHE3_A/H is used where AC or floating signals require symmetrical protection.
Does SMB8J24CAHE3_A/H require special PCB layout considerations?
Yes, SMB8J24CAHE3_A/H requires minimum 5.0 mm × 5.0 mm copper pads per terminal to achieve rated 800 W pulse power and maintain RθJA = 72 °C/W. Thermal vias under pads improve heat dissipation in high-duty-cycle applications. Because it is bidirectional, no cathode band orientation is needed - symmetric placement simplifies automated assembly. Avoid narrow traces between SMB8J24CAHE3_A/H and protected node to preserve low-inductance surge path.
What is the reverse leakage current specification for SMB8J24CAHE3_A/H at 24 V?
The SMB8J24CAHE3_A/H exhibits a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 24 V, measured at 25 °C. This ultra-low leakage ensures minimal impact on high-impedance sensor bias networks and feedback loops. Leakage remains below 5.0 μA up to 80 % of VWM across the full -55 °C to +125 °C operating range, preserving accuracy in precision analog circuits protected by SMB8J24CAHE3_A/H.
SMB8J24CAHE3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- 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)
SMB8J24CAHE3_A/H FAQ
1.How can I place an order for SMB8J24CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J24CAHE3_A/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 SMB8J24CAHE3_A/H reliable?
The price and inventory of SMB8J24CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J24CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J24CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J24CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J24CAHE3_A/H?
SMB8J24CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J24CAHE3_A/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 SMB8J24CAHE3_A/H?
For technical support, including SMB8J24CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J24CAHE3_A/H requirements.
6.How does Aetrix verify that SMB8J24CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J24CAHE3_A/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 SMB8J24CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J24CAHE3_A/H?
All SMB8J24CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J24CAHE3_A/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 SMB8J24CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMB8J24CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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