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Vishay General Semiconductor - Diodes Division SMAJ9.0CAHM3/I
- Part No.:
- SMAJ9.0CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ9.0CAHM3/I.pdf
- Description:
- TVS DIODE 9VWM 15.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,463
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Product details
Overview
SMAJ9.0CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping ESD and surge transients on signal/power lines. It features 9.0 V standoff voltage (VWM), 10.0–11.1 V breakdown voltage (VBR) at 1 mA, 15.4 V maximum clamping voltage (VC) at 26.0 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ9.0CAHM3/I datasheet, SMAJ9.0CAHM3/I pinout, SMAJ9.0CAHM3/I application, or SMAJ9.0CAHM3/I equivalent, this device serves as a halogen-free, AEC-Q101-qualified TVS for bidirectional overvoltage protection where low clamping voltage, fast response (<1 ns), and MSL Level 1 reflow compatibility are critical selection criteria.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VWM, and VC specifications in forward and reverse directions. Its glass-passivated junction ensures stable leakage (<5.0 μA at VWM) and robust surge handling up to 26.0 A (10/1000 μs).
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, enabling reliable operation up to TJ = +150 °C. The SMA package supports automated placement and meets UL 94 V-0 flammability rating with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below system supply or signal swing. |
| VBR (min/max) | 10.0 V / 11.1 V at IT = 1 mA - Confirmed breakdown threshold range defining turn-on consistency across production lots. |
| VC @ IPPM | 15.4 V at 26.0 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling capability; defines transient energy absorption capacity without failure. |
| IPPM | 26.0 A - Maximum non-repetitive surge current supported under standard 10/1000 μs waveform. |
| Leakage (ID) | ≤5.0 μA at VWM - Low reverse leakage preserves signal integrity and minimizes standby power loss. |
| TJ Range | −55 °C to +150 °C - Full automotive-grade junction temperature range supporting under-hood and industrial environments. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking - symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as input/output path; no polarity dependency - enables flexible PCB layout on differential or single-ended lines. |
| Terminal 2 | Anode / Cathode (bidirectional) | Paired terminal completing the bidirectional clamping path; identical electrical behavior to Terminal 1. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates (Vishay HM3 suffix) without compromising surge robustness or thermal performance. |
| MSL Level 1 | Rated for peak reflow temperatures up to 260 °C - eliminates moisture sensitivity concerns during standard SMT assembly. |
| 400 W peak pulse power | Handles high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without degradation when mounted on 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.40) | Minimizes overvoltage overshoot during clamping - critical for protecting 3.3 V or 5 V logic-level interfaces. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Maintains VC ≤ 15.4 V during 26 A transients - ensuring downstream 5 V microcontrollers and ADCs remain within absolute maximum ratings. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers against field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between signal line and ground, activated within <1 ns to limit transient overvoltage. Use Value: Enables reliable operation under IEC 61000-4-5 Level 3 (2 kV/12 Ω) testing due to consistent 400 W pulse power handling and low dynamic impedance. |
| Consumer USB Port Protection | Telecom Line Interface Protection |
|
Use Scenario: Shielding USB 2.0 D+/D− data lines in portable devices from ESD events (IEC 61000-4-2 ±15 kV contact discharge). IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed inline with differential pair to clamp common-mode and differential transients. Use Value: Delivers sub-15 V clamping at 26 A while maintaining signal integrity - verified by typical junction capacitance <200 pF at VR = 0 V. |
Use Scenario: Guarding Ethernet PHY interface pins and telephone line drivers against lightning-induced surges in VoIP gateways and DSL modems. IC Role / Device Role / Timing Role: Primary overvoltage suppression stage located at board edge before isolation transformers or line drivers. Use Value: Withstands repetitive 10/1000 μs surges up to 400 W (duty cycle 0.01 %), meeting GR-1089-CORE telecom surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0CAHE3/I | Same electrical specs, but RoHS-compliant (non-halogen-free) and commercial-grade - lacks AEC-Q101 qualification. | Suitable for non-automotive industrial or consumer use where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs halogen-free or automotive qualification needs. |
| SMBJ9.0CAHM3/I | Same VWM/VBR/VC, but SMB (DO-214AA) package - 25 % larger footprint and higher RθJA (100 °C/W vs. 120 °C/W). | Better thermal dissipation margin for high-duty-cycle surge environments; requires PCB layout revision. | Choose when higher surge repetition rate or improved thermal headroom is required despite larger board area. |
Compared with SMAJ9.0CAHM3/I, SMAJ9.0CAHE3/I trades halogen-free construction and AEC-Q101 qualification for lower cost, while SMBJ9.0CAHM3/I offers enhanced thermal performance at the expense of PCB space - making SMAJ9.0CAHM3/I optimal for space-constrained, automotive-grade bidirectional protection.
Availability
SMAJ9.0CAHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecommunications infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ9.0CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series delivers standardized, high-reliability TVS diodes optimized for board-level ESD and surge protection across automotive, industrial, and communications end markets - with HM3 suffix denoting halogen-free, AEC-Q101-qualified variants.
FAQ
What is the clamping voltage of SMAJ9.0CAHM3/I at its rated peak pulse current?
The SMAJ9.0CAHM3/I has a maximum clamping voltage (VC) of 15.4 V at its rated peak pulse current (IPPM) of 26.0 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The low VC ensures protected circuits - such as 5 V microcontrollers or analog front-ends - remain within safe operating limits during surge events. SMAJ9.0CAHM3/I maintains this clamping performance across its full temperature range (−55 °C to +150 °C).
Is SMAJ9.0CAHM3/I suitable for automotive applications?
Yes, SMAJ9.0CAHM3/I is AEC-Q101 qualified and explicitly designated for automotive use via the "HM3" suffix, indicating halogen-free, RoHS-compliant, and automotive-grade construction. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and surge robustness. The device is deployed in engine control units, body electronics, and ADAS sensor modules where bidirectional transient suppression is required. SMAJ9.0CAHM3/I's qualification documentation is maintained by Vishay and referenced in ordering code HM3_X (where X denotes revision).
How does the bidirectional configuration of SMAJ9.0CAHM3/I affect its circuit implementation?
The bidirectional configuration of SMAJ9.0CAHM3/I means both terminals are functionally identical - there is no anode or cathode marking, and the device clamps symmetrically in either polarity. This allows direct placement across any two nodes requiring mutual overvoltage protection, such as differential signal pairs (e.g., RS-485, CAN), AC-coupled lines, or ungrounded power rails. Unlike unidirectional TVS diodes, SMAJ9.0CAHM3/I eliminates orientation errors during assembly and simplifies schematic symbol usage. Its VBR, VC, and IPPM values apply identically in both directions.
What is the thermal resistance profile of SMAJ9.0CAHM3/I, and how does it impact PCB layout?
SMAJ9.0CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C under sustained 3.3 W power dissipation, designers must ensure adequate copper area and avoid thermal bottlenecks in traces. The SMA package's MSL Level 1 rating permits standard reflow profiles up to 260 °C, but thermal relief patterns should follow Vishay's recommended pad layout to preserve surge reliability. SMAJ9.0CAHM3/I's thermal specs are validated per JESD51-2 and JESD51-14.
Does SMAJ9.0CAHM3/I meet industry standards for ESD and surge immunity?
Yes, SMAJ9.0CAHM3/I is characterized for compliance with key immunity standards: it supports IEC 61000-4-2 (±15 kV contact discharge) via sub-nanosecond response time and low clamping voltage; passes IEC 61000-4-5 (2 kV/12 Ω, 10/1000 μs) due to its 400 W peak pulse rating; and satisfies AEC-Q101 stress tests for automotive deployment. Vishay also lists Underwriters Laboratory recognition (QVGQ2, file E136766) for both unidirectional and bidirectional devices. These certifications are documented in the 88390 datasheet and apply directly to SMAJ9.0CAHM3/I as an HM3-suffixed variant.
SMAJ9.0CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 26A
- 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)
SMAJ9.0CAHM3/I FAQ
1.How can I place an order for SMAJ9.0CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ9.0CAHM3/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 SMAJ9.0CAHM3/I reliable?
The price and inventory of SMAJ9.0CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ9.0CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ9.0CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ9.0CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ9.0CAHM3/I?
SMAJ9.0CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ9.0CAHM3/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 SMAJ9.0CAHM3/I?
For technical support, including SMAJ9.0CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ9.0CAHM3/I requirements.
6.How does Aetrix verify that SMAJ9.0CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ9.0CAHM3/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 SMAJ9.0CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ9.0CAHM3/I?
All SMAJ9.0CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ9.0CAHM3/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 SMAJ9.0CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ9.0CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ9.0CAHM3/I Tags
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