My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMB8J22CAHM3_A/I
- Part No.:
- SMB8J22CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J22CAHM3_A/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,337
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMB8J22CAHM3_A/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 22 V stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR), 35.5 V clamping voltage (VC) at 22.5 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 SMB8J22CAHM3_A/I datasheet, SMB8J22CAHM3_A/I pinout, SMB8J22CAHM3_A/I application, or SMB8J22CAHM3_A/I equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping symmetry, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement 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 architecture enables symmetrical clamping above ±22 V without polarity sensitivity, making it suitable for AC-coupled or floating signal paths.
Rated for -55 °C to +150 °C junction temperature, it meets MSL Level 1 per J-STD-020 (260 °C reflow peak), supports 1000-cycle 8.3 ms surge endurance, and delivers stable leakage (<1.0 µA at VWM) under steady-state bias - critical for low-power sensor front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for protected circuitry. |
| VBR min/max | 24.4 V / 26.9 V at 1.0 mA test current - ensures predictable turn-on threshold across production lot and temperature range. |
| VC @ IPPM | 35.5 V at 22.5 A - clamping voltage limits downstream IC stress during 10/1000 µs surges; directly determines protected device's voltage tolerance. |
| PPPM | 800 W (10/1000 µs) - quantifies single-event surge energy handling; validates suitability for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3. |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance enables efficient heat transfer to PCB copper, sustaining repeated surge duty cycles. |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC standard. |
| Package | SMB (DO-214AA) - surface-mount outline with 5.59 mm × 4.06 mm footprint, compatible with standard 7" and 13" tape-and-reel feeders. |
Pinout & Package
Two-terminal SMB (DO-214AA) package with cathode band marking omitted (bidirectional type); terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge conduction path | No polarity dependence - either terminal serves as anode or cathode depending on transient polarity; eliminates orientation errors during placement. |
| Case (body) | Thermal and mechanical interface | Exposed metal slug provides primary thermal path to PCB copper pad; requires minimum 5.0 mm × 5.0 mm Cu area per terminal per datasheet fig. 2. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term reliability under humidity and thermal cycling - validated per AEC-Q101. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without preconditioning; eliminates moisture-related popcorning risk in high-volume SMT lines. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental requirements (e.g., VW 80101) and global regulatory mandates without compromising surge performance. |
| Low RθJL (20 °C/W) | Reduces junction temperature rise by >30% vs. comparable SMB TVS devices, extending surge endurance in thermally constrained layouts. |
| 1.0 µA max ID at VWM | Minimizes standby power loss and signal distortion in high-impedance sensor or communication lines (e.g., CAN FD stubs, LIN bus). |
Applications
| Automotive Occupant Detection System | Industrial PLC Analog Input Module |
|---|---|
|
Use Scenario: Protects capacitive seat sensors from load-dump and jump-start transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between sensor electrode and MCU ADC input, responding within <1 ns to limit voltage to <36 V. Use Value: Prevents ADC saturation and EEPROM corruption during ISO 16750-2 pulses while maintaining <1 µA leakage at 22 V bias. |
Use Scenario: Shields 4–20 mA current-loop receiver inputs from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on signal line, coordinated with series current-limiting resistor and secondary filtering. Use Value: Sustains 800 W surge handling without degradation across 1000+ events, enabling 15-year field life in harsh EMC environments. |
| Automotive Radar Power Supply Rail | Smart Building HVAC Sensor Node |
|
Use Scenario: Guards 5 V LDO output feeding 77 GHz radar MMICs against coupled transients from adjacent switching regulators. IC Role / Device Role / Timing Role: Low-capacitance (CJ ≈ 200 pF at 0 V) shunt protector placed immediately at LDO output capacitor. Use Value: Clamps 10/1000 µs surges to ≤35.5 V while adding <0.5% gain error to precision 5 V rail due to <1 µA leakage. |
Use Scenario: Safeguards RS-485 transceiver I/O pins in battery-powered HVAC nodes exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: First-line transient suppressor on differential bus lines, upstream of internal transceiver ESD diodes. Use Value: Absorbs 4 kV contact discharge (IEC 61000-4-2) and 2 kV surge (IEC 61000-4-5) without latch-up or parameter shift over 10-year deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J22CAHE3_A/I | RoHS-compliant but not halogen-free; same VWM/VBR/VC/PPPM specs and AEC-Q101 qualification. | Acceptable where halogen-free material is not mandated (e.g., non-automotive industrial use). | Select when cost optimization is prioritized and halogen-free compliance is not required by end-customer spec. |
| SMAJ22CA-M3/5B | Smaller SMA (DO-214AC) package; lower PPPM (400 W), higher VC (38.9 V), same VWM/VBR; halogen-free, AEC-Q101 qualified. | Better suited for space-constrained designs with lower surge threat levels (e.g., consumer IoT). | Choose only if board area is critical and surge exposure is limited to IEC 61000-4-2 ±8 kV, not ISO 7637-2. |
Compared with SMB8J22CAHM3_A/I, the HE3 variant trades halogen-free content for slightly lower cost without sacrificing surge capability, while the SMAJ22CA-M3/5B reduces footprint and power rating - making SMB8J22CAHM3_A/I the optimal choice for AEC-Q101-compliant, high-energy automotive and industrial protection where thermal dissipation and robustness are paramount.
Availability
SMB8J22CAHM3_A/I is available at Aetrix Electronics and suitable for automotive occupant detection systems, industrial PLC analog input modules, radar power supply rails, and smart building HVAC sensor nodes requiring stable component supply across extended product lifecycles.
Supply support for SMB8J22CAHM3_A/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMB8JxxCA family targets AEC-Q101-compliant transient protection in space- and thermal-constrained automotive ECUs and industrial control units, emphasizing robustness, repeatability, and process-controlled surge performance.
FAQ
What is the maximum clamping voltage of SMB8J22CAHM3_A/I at its rated peak pulse current?
The SMB8J22CAHM3_A/I has a maximum clamping voltage (VC) of 35.5 V at its rated peak pulse current (IPPM) of 22.5 A with a 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and guarantees that downstream circuitry remains below critical overvoltage thresholds during surge events. The SMB8J22CAHM3_A/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C) and after repeated surge exposures.
Is SMB8J22CAHM3_A/I suitable for automotive applications requiring AEC-Q101 qualification?
Yes, SMB8J22CAHM3_A/I is explicitly AEC-Q101 qualified, as confirmed by Vishay's documentation (Document Number: 88422, Revision: 09-Jan-2024). It undergoes stress testing including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and ESD per JS-001. The HM3 suffix denotes halogen-free, RoHS-compliant construction meeting automotive material requirements - making SMB8J22CAHM3_A/I appropriate for engine control units, ADAS sensors, and body electronics.
How does the SMB8J22CAHM3_A/I differ from unidirectional variants like SMB10J22A?
The SMB8J22CAHM3_A/I is bidirectional with symmetrical clamping behavior above ±22 V, whereas SMB10J22A is unidirectional and conducts only in reverse bias. SMB8J22CAHM3_A/I offers 800 W PPPM and 22.5 A IPPM, while SMB10J22A provides 1000 W PPPM and 28.2 A IPPM but requires correct polarity orientation. The "8" prefix indicates lower surge rating than "10", and "CA" denotes bidirectional configuration - so SMB8J22CAHM3_A/I is selected when polarity-agnostic protection and AEC-Q101/halogen-free compliance are mandatory.
What is the thermal resistance from junction to ambient (RθJA) for SMB8J22CAHM3_A/I?
The typical junction-to-ambient thermal resistance (RθJA) for SMB8J22CAHM3_A/I is 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in Vishay Document 88422. However, its junction-to-lead resistance (RθJL) is 20 °C/W - a more relevant metric for SMT applications - indicating efficient heat transfer into the PCB. For reliable operation under repetitive surges, thermal design must ensure average power dissipation stays within limits defined by derating curves in Figure 2 of the SMB8J22CAHM3_A/I datasheet.
Can SMB8J22CAHM3_A/I be used in place of SMBJ22CA in new designs?
SMB8J22CAHM3_A/I is not a direct replacement for SMBJ22CA: it belongs to the higher-surge SMB10(8)JxxCA family with distinct ratings - SMBJ22CA (older series) has only 600 W PPPM and 17.3 A IPPM, while SMB8J22CAHM3_A/I delivers 800 W and 22.5 A. Additionally, SMB8J22CAHM3_A/I carries AEC-Q101 qualification and HM3 halogen-free compliance, which SMBJ22CA lacks. Use SMB8J22CAHM3_A/I when upgraded surge immunity and automotive qualification are required; verify layout compatibility, as both share SMB (DO-214AA) package dimensions.
SMB8J22CAHM3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 22.5A
- 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)
SMB8J22CAHM3_A/I FAQ
1.How can I place an order for SMB8J22CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J22CAHM3_A/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 SMB8J22CAHM3_A/I reliable?
The price and inventory of SMB8J22CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J22CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J22CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J22CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J22CAHM3_A/I?
SMB8J22CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J22CAHM3_A/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 SMB8J22CAHM3_A/I?
For technical support, including SMB8J22CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J22CAHM3_A/I requirements.
6.How does Aetrix verify that SMB8J22CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J22CAHM3_A/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 SMB8J22CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J22CAHM3_A/I?
All SMB8J22CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J22CAHM3_A/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 SMB8J22CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMB8J22CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J22CAHM3_A/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 …
