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Vishay General Semiconductor - Diodes Division SMAJ17CAHM3/I
- Part No.:
- SMAJ17CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17CAHM3/I.pdf
- Description:
- TVS DIODE 17VWM 27.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,101
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Product details
Overview
SMAJ17CAHM3/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 17 V standoff voltage (VWM), 18.9–20.9 V breakdown range (VBR at 1 mA), 400 W peak pulse power (10/1000 μs), clamping voltage of 27.6 V at 14.5 A, and operates across –55 °C to +150 °C junction temperature.
For engineers reviewing the SMAJ17CAHM3/I datasheet, SMAJ17CAHM3/I pinout, SMAJ17CAHM3/I application, or SMAJ17CAHM3/I equivalent, this device is selected for ESD/surge protection on automotive sensor signal lines, industrial I/O ports, and DC power rails where AEC-Q101 qualification, low clamping ratio, and halogen-free RoHS compliance are required.
Technical Context
This bidirectional TVS diode operates symmetrically in both polarities, with identical electrical characteristics forward and reverse - no polarity marking on the case. Its glass-passivated junction enables fast response (<1 ns), low incremental surge resistance, and stable clamping under repetitive transients up to 0.01% duty cycle.
Thermally, it exhibits RθJA = 120 °C/W (on standard 5.0 mm × 5.0 mm copper pads) and RθJL = 30 °C/W, supporting reliable operation at 3.3 W steady-state dissipation. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 12 V nominal systems. |
| VBR (min/max) | 18.9 V / 20.9 V at 1 mA - verified breakdown threshold ensures predictable turn-on during transients without premature leakage. |
| VC @ IPPM | 27.6 V at 14.5 A - clamping voltage limits downstream IC stress during 400 W 10/1000 μs surges. |
| PPPM | 400 W - peak pulse power rating per JEDEC-standard waveform; derates to 300 W above 78 V. |
| IFSM | 40 A - non-repetitive forward surge current capability supports high-energy inductive switching events. |
| TJ max | +150 °C - extended junction temperature rating enables use in under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - surface-mount, low-profile package compatible with automated placement and reflow soldering (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; bidirectional configuration has no polarity marking - terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no cathode band or polarity indicator on bidirectional devices. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces requiring zero-failure reliability. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations without compromising thermal or surge performance; suitable for export-controlled designs. |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients from inductive load switching (e.g., solenoid drivers, relay coils) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping - critical for protecting 3.3 V or 5 V logic-level interfaces downstream. |
| Fast response time (<1 ns) | Engages before transient energy couples into protected circuitry, preserving signal integrity on high-speed sensor lines. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
|
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 / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy to ground before reaching signal conditioning ICs. Use Value: Enables compliance with AEC-Q100 stress tests and extends lifetime of precision ADC front-ends by limiting input voltage to ≤27.6 V during 100 V/50 ms transients. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges and electrostatic discharge in factory automation systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input lines, coordinated with series impedance to limit let-through current to <100 mA. Use Value: Maintains functional safety integrity by preventing latch-up or permanent damage to microcontroller GPIOs during repeated 4 kV contact ESD events. |
| DC Power Rail Protection | Consumer Electronics Interface Protection |
|
Use Scenario: Guarding 12 V/24 V power distribution networks in telecom base stations and PoE-powered equipment against lightning-induced surges. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), absorbing residual energy and suppressing high-frequency ringing. Use Value: Reduces system-level failure rate by clamping 10/1000 μs surges to 27.6 V while sustaining 400 W peak power without thermal runaway. |
Use Scenario: Shielding USB 2.0 data lines and HDMI hot-swap circuits in smart displays and set-top boxes from human-body-model (HBM) ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 200 pF at 0 V) placed adjacent to connector to minimize signal distortion. Use Value: Preserves signal rise/fall times while meeting IEC 61000-4-2 Level 4 (±8 kV contact) without degrading eye diagram integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17CAHE3/I | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free requirement (E3 vs HM3). | Acceptable for commercial/industrial automotive supply chains where halogen-free is not mandated. | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and thermal behavior. |
| SMBJ17CAHM3/I | Same VWM, VBR, and VC, but SMB (DO-214AA) package - 25% larger footprint and higher RθJA (100 °C/W). | Better suited for high-power, low-density layouts where PCB space permits and thermal margin is constrained. | Choose only if 600 W peak pulse power (vs. 400 W) is required; otherwise, SMAJ17CAHM3/I offers superior board density. |
Compared with SMAJ17CAHE3/I, the HM3 variant adds halogen-free assurance without trade-offs in surge rating or qualification; versus SMBJ17CAHM3/I, SMAJ17CAHM3/I delivers identical protection in a smaller footprint but with lower absolute power handling - making it optimal for space-constrained automotive modules.
Availability
SMAJ17CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, and DC power rail surge suppression requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMAJ17CAHM3/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, and passive components for automotive, industrial, and computing markets.
The SMAJ series is engineered specifically for board-level transient suppression in harsh environments - emphasizing AEC-Q101 qualification, tight parametric tolerances, and consistent clamping performance across temperature.
FAQ
What does the "CA" suffix indicate in SMAJ17CAHM3/I?
The "CA" suffix denotes a bidirectional configuration - meaning SMAJ17CAHM3/I provides symmetrical transient suppression in both polarities, with identical VBR, VC, and IPPM values regardless of voltage polarity. This eliminates the need for polarity-aware layout and simplifies design for AC-coupled or floating signal lines.
Is SMAJ17CAHM3/I suitable for protecting 12 V automotive power supplies?
Yes - SMAJ17CAHM3/I's 17 V VWM provides adequate margin above nominal 12 V systems (including 14 V alternator regulation), while its 27.6 V clamping voltage stays well below typical 36 V automotive IC absolute maximum ratings. Its AEC-Q101 qualification and –55 °C to +150 °C operation further confirm suitability for under-hood deployment.
How does the HM3 suffix differ from M3 or HE3 in SMAJ17CAHM3/I?
The HM3 suffix in SMAJ17CAHM3/I specifies halogen-free, RoHS-compliant construction *and* AEC-Q101 qualification. In contrast, M3 is halogen-free/RoHS but not AEC-Q101 qualified, and HE3 is AEC-Q101 qualified but not halogen-free. HM3 uniquely satisfies both stringent automotive environmental and reliability requirements.
What is the maximum clamping voltage of SMAJ17CAHM3/I under surge conditions?
The maximum clamping voltage of SMAJ17CAHM3/I is 27.6 V, measured at its peak pulse current (IPPM) of 14.5 A using the standardized 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and forms the basis for downstream component voltage stress analysis.
Can SMAJ17CAHM3/I be used in place of unidirectional SMAJ17A variants?
No - SMAJ17CAHM3/I is strictly bidirectional and lacks a cathode marking; substituting it for unidirectional SMAJ17A would compromise protection on DC-biased lines (e.g., power rails with defined polarity). Unidirectional types conduct only in reverse bias and block forward current - a function SMAJ17CAHM3/I cannot replicate.
SMAJ17CAHM3/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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 27.6V
- Current - Peak Pulse (10/1000µs):
- 14.5A
- 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)
SMAJ17CAHM3/I FAQ
1.How can I place an order for SMAJ17CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17CAHM3/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 SMAJ17CAHM3/I reliable?
The price and inventory of SMAJ17CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ17CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17CAHM3/I?
SMAJ17CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17CAHM3/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 SMAJ17CAHM3/I?
For technical support, including SMAJ17CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17CAHM3/I requirements.
6.How does Aetrix verify that SMAJ17CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ17CAHM3/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 SMAJ17CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ17CAHM3/I?
All SMAJ17CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17CAHM3/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 SMAJ17CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ17CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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