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Vishay General Semiconductor - Diodes Division SMAJ15CAHM3_A/H
- Part No.:
- SMAJ15CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15CAHM3_A/H.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,035
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Product details
Overview
SMAJ15CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 15 V standoff voltage (VWM), 24.4 V maximum clamping voltage (VC) at 16.4 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), making it suitable for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial systems.
For engineers reviewing the SMAJ15CAHM3_A/H datasheet, SMAJ15CAHM3_A/H pinout, SMAJ15CAHM3_A/H application, or SMAJ15CAHM3_A/H equivalent, key selection criteria include bidirectional surge protection capability, AEC-Q101 qualification, low clamping ratio (VC/VWM = 1.63), MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance per Vishay HM3 suffix.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA construction, with breakdown voltage (VBR) specified at 16.7–18.5 V (min/max) under 1 mA test current. Its clamping behavior is defined by a 10/1000 μs double-exponential surge waveform, delivering 24.4 V clamping at 16.4 A while maintaining low incremental surge resistance and sub-nanosecond response time.
The device uses a glass-passivated silicon junction housed in an SMA (DO-214AC) surface-mount package rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation on standard 0.2" × 0.2" copper pads without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse working voltage before clamping begins |
| VBR (min/max) | 16.7 V / 18.5 V - Breakdown occurs within this range at 1 mA, ensuring predictable turn-on |
| VC @ IPPM | 24.4 V at 16.4 A - Clamped voltage during 10/1000 μs surge, limiting stress on downstream components |
| PPPM | 400 W - Peak pulse power handling capacity, derated to 300 W above 78 V |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine), relevant for unidirectional testing only |
| TJ max | +150 °C - Maximum junction temperature, supporting high-temperature automotive and industrial environments |
| MSL Level | Level 1 - No floor life limitation; safe for reflow up to 260 °C peak |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H), cathode band omitted per bidirectional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (either direction) | One terminal of symmetrical PN junction; accepts surge current from either polarity |
| Cathode | Transient current exit (either direction) | Second terminal of symmetrical PN junction; completes bidirectional conduction path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and supports lead-free reflow assembly without compromising reliability |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients from inductive switching and ESD events in compact footprint |
| Low clamping ratio (VC/VWM = 1.63) | Minimizes overvoltage exposure to protected ICs while maintaining margin above VWM |
| Fast response time (< 1 ns) | Engages before sensitive circuitry sustains damage from fast-rising transients (e.g., ISO 7637-2 pulses) |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across power rail input prior to DC/DC converter. Use Value: Limits transient excursions to ≤24.4 V, preventing latch-up or gate oxide damage in downstream PMICs and microcontrollers. | Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance shunt protector on 4–20 mA or 0–10 V signal paths exposed to relay-induced spikes. Use Value: Maintains signal integrity with <10 pF junction capacitance (typ.) while clamping surges to safe levels for precision ADC front-ends. |
| Consumer Device USB Port ESD Suppression | Telecom Base Station DC Power Input |
Use Scenario: Secondary-level ESD protection on USB 2.0 VBUS and D+/D− lines in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary polymer PTC fuse and upstream of USB transceiver IC. Use Value: Absorbs ±15 kV contact discharge (IEC 61000-4-2) without degradation, preserving data line timing margins. | Use Scenario: Front-end surge suppression on -48 V DC telecom power feeds subject to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamp installed at power entry point before DC/DC isolation stage. Use Value: Handles repetitive 400 W surges per ITU-T K.21 recommendation while maintaining stable VWM under long-term bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15CAHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3) | Lacks halogen-free certification; acceptable for commercial but not automotive-grade supply chains requiring HM3 | Select SMAJ15CAHE3_A/H only if halogen-free requirement is waived and cost optimization is prioritized |
| SMBJ15CAHM3_A/H | Same VWM, VC, and AEC-Q101 qualification; higher 600 W PPPM in SMB (DO-214AA) package | Larger footprint (4.57 mm × 3.94 mm); better thermal dissipation but requires PCB layout change | Choose SMBJ15CAHM3_A/H when surge energy exceeds 400 W or board space allows larger package for enhanced robustness |
Compared with SMAJ15CAHE3_A/H, the SMAJ15CAHM3_A/H adds halogen-free compliance for stricter environmental programs; versus SMBJ15CAHM3_A/H, it trades 200 W extra pulse power for 30 % smaller PCB area-critical in space-constrained automotive modules.
Availability
SMAJ15CAHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power input stages requiring stable component supply, AEC-Q101 validation, and halogen-free compliance.
Supply support for SMAJ15CAHM3_A/H 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 and automotive-grade qualification.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments, targeting automotive power distribution, industrial control I/O, and communications infrastructure where consistent clamping performance and long-term stability are critical.
FAQ
What does the 'CA' suffix indicate in SMAJ15CAHM3_A/H?
The 'CA' suffix in SMAJ15CAHM3_A/H denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression for both positive and negative polarity surges. Unlike unidirectional variants (e.g., SMAJ15A), SMAJ15CAHM3_A/H has no polarity marking and functions identically in either direction-essential for AC-coupled or floating signal lines where voltage reversal is possible.
Is SMAJ15CAHM3_A/H qualified for automotive use?
Yes, SMAJ15CAHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix with '_A/H' revision). This qualification validates its performance under extended temperature cycling, humidity bias, mechanical shock, and high-temperature operating life tests required for under-hood and chassis-mounted automotive electronics.
How does the clamping voltage of SMAJ15CAHM3_A/H compare to its standoff voltage?
SMAJ15CAHM3_A/H has a 15 V standoff voltage (VWM) and clamps at 24.4 V (VC) under 16.4 A surge current, yielding a clamping ratio of 1.63. This ratio ensures sufficient margin above VWM to avoid false triggering during normal operation while limiting transient overvoltage to a level safe for 24 V-rated ICs and MOSFETs downstream of SMAJ15CAHM3_A/H.
What is the significance of the 'HM3' suffix in SMAJ15CAHM3_A/H?
The 'HM3' suffix in SMAJ15CAHM3_A/H indicates halogen-free, RoHS-compliant construction meeting JEDEC J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements. It distinguishes this variant from E3 (RoHS only) and HE3/HM3 automotive versions, confirming suitability for environmentally regulated automotive supply chains and lead-free reflow processes.
Can SMAJ15CAHM3_A/H be used in place of a unidirectional TVS like SMAJ15A?
No-SMAJ15CAHM3_A/H is bidirectional and lacks polarity marking, whereas SMAJ15A is unidirectional with a cathode band. Substituting SMAJ15CAHM3_A/H for SMAJ15A in DC-biased circuits may cause unintended conduction during normal forward bias. Use SMAJ15CAHM3_A/H only where symmetrical surge protection is required, such as AC lines, differential signals, or floating rails.
SMAJ15CAHM3_A/H 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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)
SMAJ15CAHM3_A/H FAQ
1.How can I place an order for SMAJ15CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15CAHM3_A/H 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 SMAJ15CAHM3_A/H reliable?
The price and inventory of SMAJ15CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ15CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15CAHM3_A/H?
SMAJ15CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15CAHM3_A/H 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 SMAJ15CAHM3_A/H?
For technical support, including SMAJ15CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ15CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ15CAHM3_A/H 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 SMAJ15CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ15CAHM3_A/H?
All SMAJ15CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15CAHM3_A/H, 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 SMAJ15CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ15CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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