My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMB8J24CAHM3/I
- Part No.:
- SMB8J24CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J24CAHM3/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,062
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMB8J24CAHM3/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), 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 SMB8J24CAHM3/I datasheet, SMB8J24CAHM3/I pinout, SMB8J24CAHM3/I application, or SMB8J24CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance (HM3 suffix), and compatibility with 0.2" × 0.2" copper pad layouts per JEDEC standard mounting requirements.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within <1 ps 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 symmetric suppression of positive and negative polarity surges without polarity-sensitive placement.
Rated for -55 °C to +150 °C operating junction temperature and qualified to AEC-Q101, SMB8J24CAHM3/I supports automotive-grade reliability under thermal cycling and mechanical stress. Its MSL Level 1 rating (peak reflow ≤260 °C) and matte tin-plated leads ensure compatibility with lead-free SMT assembly processes per J-STD-002 and JESD 22-B102.
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 IT = 1 mA - verified breakdown threshold range ensuring consistent turn-on across production lots. |
| VC @ IPPM | 38.9 V at 20.6 A - clamping voltage under 10/1000 µs surge; limits downstream IC stress during 800 W transient events. |
| PPPM | 800 W - peak pulse power handling with 10/1000 µs waveform; supports robust protection in automotive load-dump scenarios. |
| ID @ VWM | 1.0 µA - ultra-low reverse leakage at stand-off voltage, minimizing standby power loss in battery-powered sensors. |
| TJ max | +150 °C - extended junction temperature rating enabling use in under-hood automotive environments. |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height for automated placement. |
Pinout & Package
SMB8J24CAHM3/I uses the SMB (DO-214AA) package: a two-terminal, non-polarized surface-mount case with cathode band marking omitted per bidirectional construction. Terminals are matte tin-plated, solderable per J-STD-002, and rated for JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge conduction path | No polarity dependency - either terminal serves as anode or cathode depending on transient polarity; eliminates orientation errors in layout. |
| Case (body) | Thermal and mechanical interface | Plastic molding meets UL 94 V-0; thermal resistance RθJA = 72 °C/W enables dissipation of 800 W pulses with proper PCB copper area (0.2" × 0.2" pads). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, ADAS sensors, and body electronics per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and supports lead-free reflow profiles up to 260 °C peak temperature. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfacing with 24 V supply domains. |
| Fast response time (<1 ps) | Clamps transients before propagation into sensitive analog front-ends or microcontroller I/O pins. |
| MSL Level 1 moisture sensitivity | Enables floor-life unlimited storage and direct placement without baking - reduces manufacturing overhead. |
Applications
| Automotive Sensor Interface | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role: Bidirectional shunt clamp placed between signal line and ground, absorbing energy before it reaches the transceiver's ESD structure. Use Value: Maintains signal integrity during 800 W surges while holding clamped voltage below 39 V - preserving 24 V rail compatibility and preventing latch-up in connected ASICs. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers against field-wiring transients and relay coil flyback. IC Role / Device Role: Primary surge suppression element mounted directly at connector entry point, upstream of optocoupler or Schmitt trigger input stage. Use Value: Enables reliable operation in harsh factory environments with >100,000 surge cycles due to low degradation rate and stable VBR over temperature. |
| Telecom Line Card Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHYs and PoE injectors from lightning-induced surges on twisted-pair data lines in outdoor telecom cabinets. IC Role / Device Role: Secondary-level TVS in series with gas discharge tube (GDT), providing fast clamping after GDT ionization. Use Value: 38.9 V VC ensures no overvoltage exceeds Ethernet PHY absolute maximum ratings (typically ±40 V), even under worst-case 10/1000 µs waveforms. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers connected to microcontroller GPIOs. IC Role / Device Role: Localized clamp across motor terminals or H-bridge freewheeling paths, diverting inductive kickback away from driver ICs. Use Value: Withstands repeated 20.6 A surges at 125 °C ambient - extends system lifetime versus non-AEC-Q101 alternatives in thermally constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J24CAHE3/I | Same electrical specs and SMB package, but RoHS-compliant without halogen-free certification (E3 vs HM3). | Approved for commercial/industrial use; not certified for halogen-free requirements in automotive Tier-1 supply chains. | Select when halogen-free compliance is not mandated and cost optimization is prioritized. |
| SMAJ24CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (95 °C/W), same VWM/VC specs. | Limited to lower-energy transients; unsuitable for automotive load-dump where 800 W rating is required. | Choose only for space-constrained consumer applications with verified <400 W surge exposure. |
Compared with SMB8J24CAHE3/I, SMB8J24CAHM3/I adds halogen-free assurance for automotive OEM compliance; versus SMAJ24CA, it delivers double the surge power handling and superior thermal performance via larger SMB footprint and lower thermal resistance - essential for mission-critical 24 V systems.
Availability
SMB8J24CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC inputs, telecom line card surge hardening, and appliance motor control requiring stable component supply across long-lifecycle programs.
Supply support for SMB8J24CAHM3/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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, precision, and application-specific performance.
SMB8J24CAHM3/I belongs to Vishay's TRANSZORB® family of high-power-density TVS diodes, engineered specifically for AEC-Q101-compliant automotive and ruggedized industrial surge protection.
FAQ
What is the clamping voltage of SMB8J24CAHM3/I under a 10/1000 µs surge?
The SMB8J24CAHM3/I clamps to a maximum of 38.9 V when subjected to its rated peak pulse current of 20.6 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and guarantees predictable overvoltage limiting for downstream 24 V system components. The clamping behavior is bidirectional and repeatable across temperature and lifetime.
Is SMB8J24CAHM3/I suitable for automotive applications?
Yes, SMB8J24CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - meeting Tier-1 automotive supplier requirements. It is specified for operation from -55 °C to +150 °C and validated for mechanical shock, temperature cycling, and humidity testing per AEC-Q101. Its 800 W PPPM rating supports protection against ISO 7637-2 Pulse 5a load-dump events.
How does the SMB8J24CAHM3/I differ from unidirectional variants like SMB10J24A?
SMB8J24CAHM3/I is bidirectional with symmetrical clamping for both polarities, whereas SMB10J24A is unidirectional and requires correct cathode orientation. SMB8J24CAHM3/I has lower peak pulse power (800 W vs 1000 W) and lower IPPM (20.6 A vs 25.7 A) due to bidirectional design trade-offs, but offers polarity-agnostic placement and identical VWM/VBR/VC values - simplifying layout and reducing BOM count in differential or AC-coupled lines.
What is the meaning of the "HM3/I" suffix in SMB8J24CAHM3/I?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance, while "/I" specifies packaging in 13-inch diameter plastic tape and reel with 3200 units per reel. This ordering code ensures full compliance with automotive environmental standards and supports high-volume SMT assembly without reflow concerns - distinct from E3 (RoHS only) or HE3 (AEC-Q101 + RoHS) variants.
Can SMB8J24CAHM3/I be used in place of SMAJ24CA?
SMB8J24CAHM3/I is not a drop-in replacement for SMAJ24CA due to differing package size (SMB vs SMA), thermal resistance (72 vs 95 °C/W), and peak pulse power rating (800 W vs 400 W). While both share 24 V VWM and similar VC, the SMB8J24CAHM3/I requires larger PCB pads and delivers higher surge robustness - making it suitable for demanding automotive applications where SMAJ24CA would thermally saturate or fail prematurely.
SMB8J24CAHM3/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:
- 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:
- 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)
SMB8J24CAHM3/I FAQ
1.How can I place an order for SMB8J24CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J24CAHM3/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 SMB8J24CAHM3/I reliable?
The price and inventory of SMB8J24CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J24CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMB8J24CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J24CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J24CAHM3/I?
SMB8J24CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J24CAHM3/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 SMB8J24CAHM3/I?
For technical support, including SMB8J24CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J24CAHM3/I requirements.
6.How does Aetrix verify that SMB8J24CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J24CAHM3/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 SMB8J24CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J24CAHM3/I?
All SMB8J24CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J24CAHM3/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 SMB8J24CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J24CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J24CAHM3/I Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
