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Vishay General Semiconductor - Diodes Division SMB8J24CAHE3/52
- Part No.:
- SMB8J24CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J24CAHE3/52.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,648
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Product details
Overview
SMB8J24CAHE3/52 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) at 1 mA, 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 SMB8J24CAHE3/52 datasheet, SMB8J24CAHE3/52 pinout, SMB8J24CAHE3/52 application, or SMB8J24CAHE3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.4), and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 24 V), then rapidly avalanches below 29.5 V to divert transients up to 20.6 A while limiting downstream voltage to ≤38.9 V. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Designed per ANSI/IEEE C62.35 standards, SMB8J24CAHE3/52 delivers fast response time (<1 ns), meets MSL Level 1 per J-STD-020 (260 °C reflow), and supports operation from –55 °C to +150 °C junction temperature - enabling use in harsh automotive and industrial environments without derating below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse operating voltage before conduction begins; defines safe signal line bias range. |
| VBR min/max | 26.7 V / 29.5 V at 1 mA - tight breakdown window ensures predictable turn-on across production lots. |
| VC @ IPPM | 38.9 V at 20.6 A - clamping voltage during 10/1000 µs surge; limits protected circuit stress to safe margin below IC absolute max ratings. |
| PPPM | 800 W - peak pulse power handling capacity; enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| ID @ VWM | 1.0 µA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in battery-powered systems. |
| TJ max | +150 °C - extended junction temperature rating supports under-hood automotive placement and high-power density PCB layouts. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals suitable for AC-coupled or differential signal lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as cathode or anode depending on transient polarity; no color band or marking required. |
| Terminal 1 | Lead 1 (anode/cathode) | Matte tin-plated, solderable per J-STD-002; connects to PCB pad for thermal dissipation and surge current path. |
| Terminal 2 | Lead 2 (anode/cathode) | Matte tin-plated, solderable per J-STD-002; forms complete low-inductance shunt path with Terminal 1 during transient events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, ADAS sensors, and infotainment interfaces requiring zero field failure risk. |
| 800 W peak pulse power | Supports repeated exposure to high-energy transients (e.g., load dump, inductive switching) without degradation in clamping performance. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during surge events, reducing need for downstream voltage margining in protected ICs. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with high-volume automated assembly using 260 °C peak profile. |
| Glass-passivated junction | Ensures stable electrical parameters over lifetime and environmental stress, eliminating parameter drift due to humidity or bias aging. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from ESD and load-dump transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and ground, responding within <1 ns to limit voltage excursion. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V interface ICs by clamping surges to ≤38.9 V while maintaining <1 µA leakage at 24 V bias. |
Use Scenario: Safeguarding PLC digital input modules against induced surges from relay coil switching and motor drive noise in factory automation. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input lines, conducting only during >26.7 V transients to protect optocoupler inputs and microcontroller GPIOs. Use Value: Enables reliable operation in noisy industrial environments with 800 W surge handling and –55 °C to +150 °C operational range. |
| Telecom Line Interface | Consumer Appliance Control Board |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in base station equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary surge suppression stage ahead of secondary filtering and IC-level ESD protection, absorbing bulk energy before downstream components. Use Value: Reduces system-level surge test failures by limiting peak voltage to 38.9 V during 10/1000 µs transients, meeting IEC 61000-4-5 Level 4 requirements. |
Use Scenario: Protecting microcontroller reset lines and communication buses (I²C, UART) in washing machines and HVAC controllers exposed to mains-borne transients. IC Role / Device Role / Timing Role: Low-leakage bidirectional clamp on 3.3 V or 5 V supply rails and signal traces, activated only during overvoltage events. Use Value: Maintains system uptime by preventing brownouts and resets caused by transient-induced MCU lockup, with RoHS-compliant HE3 suffix for global compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CAHE3/52 | Same VWM (24 V), VBR (26.7–29.5 V), VC (38.9 V), but rated for 600 W PPPM (vs. 800 W). | Limited to lower-energy surge environments (e.g., consumer electronics); not recommended for automotive load-dump scenarios. | Select SMB8J24CAHE3/52 when 800 W surge immunity is required; choose SMBJ24CAHE3/52 only if cost optimization outweighs power margin. |
| SMCJ24CAHE3/52 | Same electrical specs but in larger SMC (DO-214AB) package with 1500 W PPPM rating and higher thermal mass. | Requires larger PCB footprint and may not fit space-constrained automotive modules; better suited for industrial power supplies. | Choose SMB8J24CAHE3/52 for compact SMB layout and AEC-Q101 compliance; select SMCJ24CAHE3/52 only when higher power derating or thermal headroom is critical. |
Compared with SMBJ24CAHE3/52 and SMCJ24CAHE3/52, SMB8J24CAHE3/52 uniquely balances 800 W surge capability, AEC-Q101 qualification, and SMB footprint - making it optimal for space-limited automotive and industrial edge nodes where both reliability and board area matter.
Availability
SMB8J24CAHE3/52 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O conditioning, and telecom line interface applications requiring stable component supply, AEC-Q101 traceability, and RoHS-compliant manufacturing.
Supply support for SMB8J24CAHE3/52 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, rectifiers, MOSFETs, and protection devices with emphasis on high-reliability, high-power-density solutions.
The SMB8J series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for automotive and industrial surge immunity - delivering precise clamping, low leakage, and AEC-Q101 validation in compact surface-mount packages.
FAQ
What is the clamping voltage of SMB8J24CAHE3/52 at its rated peak pulse current?
The SMB8J24CAHE3/52 has a maximum clamping voltage (VC) of 38.9 V at its specified peak pulse current (IPPM) of 20.6 A with a 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and reflects the actual voltage seen by protected circuitry during worst-case surge events. The SMB8J24CAHE3/52 maintains this clamping performance across its full operating temperature range.
Is SMB8J24CAHE3/52 suitable for automotive applications?
Yes, SMB8J24CAHE3/52 is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant and AEC-Q101 qualified construction. It is validated for high-temperature operation up to +150 °C junction temperature and tested for reliability under automotive stress conditions including temperature cycling, humidity, and surge endurance - making SMB8J24CAHE3/52 appropriate for engine control units, ADAS sensors, and body electronics.
How does the bidirectional configuration of SMB8J24CAHE3/52 affect its PCB layout?
The SMB8J24CAHE3/52 has no polarity marking and symmetrical terminals, allowing placement in either orientation on AC-coupled or differential signal lines without concern for anode/cathode alignment. This simplifies layout, eliminates orientation errors during automated assembly, and supports protection of balanced interfaces like RS-485 or CAN FD. The SMB8J24CAHE3/52 requires only two equal-sized 0.2" × 0.2" copper pads per terminal for optimal thermal and surge current handling.
What is the maximum reverse leakage current of SMB8J24CAHE3/52 at its stand-off voltage?
The SMB8J24CAHE3/52 exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 24 V stand-off voltage (VWM), measured at 25 °C ambient. This ultra-low leakage preserves signal integrity in high-impedance sensor circuits and minimizes quiescent power draw in battery-operated systems. Leakage remains well below 5 µA even at elevated temperatures up to +125 °C, ensuring stable performance in demanding environments.
Does SMB8J24CAHE3/52 meet moisture sensitivity level requirements for lead-free reflow?
Yes, SMB8J24CAHE3/52 meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C - fully compatible with standard lead-free SMT processes without pre-baking. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 for solderability, and the molding compound satisfies UL 94 V-0 flammability rating. These attributes ensure robust manufacturability and long-term reliability for SMB8J24CAHE3/52 in high-volume production.
SMB8J24CAHE3/52 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):
- 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)
SMB8J24CAHE3/52 FAQ
1.How can I place an order for SMB8J24CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J24CAHE3/52 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 SMB8J24CAHE3/52 reliable?
The price and inventory of SMB8J24CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J24CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J24CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J24CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J24CAHE3/52?
SMB8J24CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J24CAHE3/52 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 SMB8J24CAHE3/52?
For technical support, including SMB8J24CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J24CAHE3/52 requirements.
6.How does Aetrix verify that SMB8J24CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J24CAHE3/52 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 SMB8J24CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J24CAHE3/52?
All SMB8J24CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J24CAHE3/52, 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 SMB8J24CAHE3/52 part is unused and in its original packaging.
Return procedure for SMB8J24CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J24CAHE3/52 Tags
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