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Vishay General Semiconductor - Diodes Division SMAJ22CAHM3_A/I
- Part No.:
- SMAJ22CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CAHM3_A/I.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,116
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Product details
Overview
SMAJ22CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 22 V standoff voltage (VWM), 24.4–26.9 V breakdown voltage (VBR) at 1 mA, 35.5 V maximum clamping voltage (VC) at 11.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed across automotive sensor signal lines, industrial I/O ports, and telecom interface protection.
For engineers reviewing the SMAJ22CAHM3_A/I datasheet, SMAJ22CAHM3_A/I pinout, SMAJ22CAHM3_A/I application, or SMAJ22CAHM3_A/I equivalent, this part delivers AEC-Q101-qualified surge immunity, halogen-free RoHS compliance, and MSL Level 1 moisture sensitivity - critical for high-reliability automotive and industrial PCB designs requiring validated transient suppression without layout redesign.
Technical Context
This bidirectional TVS diode operates symmetrically in both polarities, enabling clamp-based protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, while the 120 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature under defined pad layouts.
The device meets UL 497B recognition (QVGQ2, E136766) and delivers sub-nanosecond response time to transients induced by inductive switching or ESD events. With 1.0 μA max reverse leakage at 22 V and 0.096 %/°C VBR temperature coefficient, it maintains precise clamping stability across automotive temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before conduction begins; defines safe signal swing margin for protected lines. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 35.5 V at 11.3 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; validates protection against IEC 61000-4-5 Level 3 surges. |
| IPPM | 11.3 A - Peak surge current supported at rated clamping voltage; correlates directly with line impedance and surge source strength. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.0 mm × 5.0 mm copper pad thermal footprint; compatible with automated reflow assembly. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C peak reflow), UL 94 V-0 rated compound. Bidirectional construction means no polarity marking; terminals are symmetrical anode/cathode pairs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (both ends) | Transient conduction path | Identical bidirectional terminals - either end connects to protected line; other end to ground or reference plane. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-20E; eliminates brominated flame retardants for safer end-of-life processing. |
| 400 W peak pulse power | Withstands 10/1000 μs surges up to 400 W - sufficient for IEC 61000-4-5 2nd edition 1 kV/2 kV line-to-ground tests. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Ensures minimal overvoltage overshoot during clamping - critical for protecting 3.3 V or 5 V logic interfaces. |
| 1.0 μA max reverse leakage @ VWM | Negligible standby current draw - avoids signal integrity degradation or battery drain in always-on systems. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and chassis ground, absorbing energy before it reaches the transceiver IC. Use Value: Maintains signal integrity during 100 V/50 ms load dump events while limiting voltage seen by the transceiver to ≤35.5 V. |
Use Scenario: Shielding digital input modules in programmable logic controllers from field-wiring induced transients (e.g., relay coil kickback). IC Role / Device Role / Timing Role: Parallel-connected TVS across each 24 V DC input channel, shunting surge current away from optocoupler input stages. Use Value: Prevents false triggering or latch-up in opto-isolators by clamping transients to 35.5 V within <1 ns - faster than microcontroller GPIO response. |
| Telecom Line Interface Protection | Consumer USB/DisplayPort ESD Guard |
Use Scenario: Safeguarding RS-485 transceivers and Ethernet PHYs in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on differential pair inputs, coordinated with GDT or MOV secondary protection. Use Value: Limits common-mode surge voltage to 35.5 V, preserving transceiver common-mode rejection ratio (CMRR) and preventing latch-up. |
Use Scenario: ESD and fast-transient protection for USB 2.0 data lines and DisplayPort AUX channels in laptops and docking stations. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) bidirectional clamp placed inline with high-speed signal traces near connectors. Use Value: Provides ±15 kV contact / ±20 kV air-gap ESD immunity per IEC 61000-4-2 without degrading 480 Mbps USB 2.0 eye diagram. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CAHE3_A/I | Same electrical specs, but RoHS-compliant (non-halogen-free) version with matte tin plating. | Approved for commercial and automotive use, but lacks halogen-free certification required by some Tier 1 OEMs. | Select when halogen-free compliance is not mandated and cost optimization is prioritized. |
| SMBJ22CAHM3_A/I | Same VWM/VC, but SMB (DO-214AA) package - 20 % larger footprint and 600 W PPPM. | Better thermal dissipation for higher-duty-cycle surge environments; requires PCB layout change. | Choose when system-level surge testing exceeds 400 W or sustained pulse repetition is expected. |
Compared with SMAJ22CAHE3_A/I, the SMAJ22CAHM3_A/I adds halogen-free compliance without sacrificing performance; versus SMBJ22CAHM3_A/I, it trades 200 W extra pulse power for 30 % smaller board area - ideal for space-constrained automotive ECUs and portable telecom modules.
Availability
SMAJ22CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface boards requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMAJ22CAHM3_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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal fidelity or thermal performance.
FAQ
What is the clamping voltage of SMAJ22CAHM3_A/I at its rated peak pulse current?
The SMAJ22CAHM3_A/I has a maximum clamping voltage (VC) of 35.5 V at 11.3 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ22CAHM3_A/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMAJ22CAHM3_A/I suitable for automotive applications?
Yes, SMAJ22CAHM3_A/I is AEC-Q101 qualified and specifically designated for automotive use via the "HM3" suffix (halogen-free, RoHS-compliant, AEC-Q101). It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD per JESD22, making it appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability under thermal and electrical stress is mandatory. The SMAJ22CAHM3_A/I meets UL 497B recognition for telecom and automotive surge protection.
How does the bidirectional configuration of SMAJ22CAHM3_A/I affect its circuit placement?
The SMAJ22CAHM3_A/I is inherently bidirectional, meaning both terminals are functionally identical - no cathode band or polarity marking is present. This allows direct placement across any two-node interface (e.g., differential signal pair, AC line, or ungrounded bus) without orientation concerns. Unlike unidirectional TVS diodes, the SMAJ22CAHM3_A/I provides symmetrical clamping in either direction, eliminating risk of incorrect installation and simplifying layout for balanced protection schemes.
What is the thermal resistance of SMAJ22CAHM3_A/I, and how does it impact PCB layout?
The SMAJ22CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal planes. To maintain safe junction temperatures under repetitive surge conditions, designers must adhere to the specified pad layout and avoid excessive trace length or narrow connections. The SMAJ22CAHM3_A/I's RθJL of 30 °C/W further indicates efficient heat transfer to solder joints when using adequate copper mass.
Does SMAJ22CAHM3_A/I meet industry standards for surge and ESD protection?
Yes, SMAJ22CAHM3_A/I is recognized under UL 497B (file E136766) for telecommunications and industrial protectors, and complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) immunity requirements when applied per manufacturer guidelines. Its 400 W peak pulse power rating aligns with Level 3 (1 kV line-earth, 2 kV line-line) of IEC 61000-4-5 Ed. 3. The SMAJ22CAHM3_A/I also satisfies J-STD-020 MSL Level 1 and JEDEC J-STD-20E reflow profiles for lead-free assembly.
SMAJ22CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 11.3A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ22CAHM3_A/I FAQ
1.How can I place an order for SMAJ22CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CAHM3_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 SMAJ22CAHM3_A/I reliable?
The price and inventory of SMAJ22CAHM3_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 SMAJ22CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ22CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CAHM3_A/I?
SMAJ22CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CAHM3_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 SMAJ22CAHM3_A/I?
For technical support, including SMAJ22CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ22CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ22CAHM3_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 SMAJ22CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ22CAHM3_A/I?
All SMAJ22CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CAHM3_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 SMAJ22CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ22CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22CAHM3_A/I Tags
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