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Vishay General Semiconductor - Diodes Division SMAJ7.0CAHM3_A/H
- Part No.:
- SMAJ7.0CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ7.0CAHM3_A/H.pdf
- Description:
- TVS DIODE 7VWM 12VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ7.0CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 7.0 V stand-off voltage (VWM), 7.78–8.60 V breakdown voltage (VBR) at 10 mA, 12.0 V maximum clamping voltage (VC) at 33.3 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed in automotive sensor interface protection.
For engineers reviewing the SMAJ7.0CAHM3_A/H datasheet, SMAJ7.0CAHM3_A/H pinout, SMAJ7.0CAHM3_A/H application, or SMAJ7.0CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), low leakage (<5 μA at VWM), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche junction structure, responding to fast transients (sub-nanosecond response time) with low incremental surge resistance. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-sensitive layout constraints.
The SMAJ7.0CAHM3_A/H is rated for repetitive 10/1000 μs surges at 0.01 % duty cycle (400 W ≤78 V; 300 W >78 V), with thermal derating above 25 °C per Fig. 2 and junction temperature limits of –55 °C to +150 °C. It meets J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.0 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal line operating margin. |
| VBR min/max | 7.78 V / 8.60 V at 10 mA - Confirmed breakdown threshold range; ensures reliable turn-on within spec across process variation. |
| VC @ IPPM | 12.0 V at 33.3 A - Clamped voltage during 10/1000 μs transient; determines protected IC's maximum stress exposure. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy handling capacity; supports IEC 61000-4-5 Level 3/4 surge immunity. |
| ID @ VWM | <5 μA - Reverse leakage at stand-off voltage; minimizes quiescent power loss and avoids false triggering. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" pads; informs board-level thermal design. |
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); matte tin-plated leads, RoHS-compliant and halogen-free (HM3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | One terminal of symmetrical avalanche junction; conducts during positive overvoltage events. |
| Cathode | Transient current entry (negative half-cycle) | Second terminal of symmetrical junction; conducts during negative overvoltage events; no band marking for bidirectional types. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 10/1000 μs surge waveforms up to 33.3 A without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VWM = 1.71) | Minimizes overvoltage stress on downstream ICs-critical for protecting 5 V logic interfaces and CAN transceivers. |
| MSL Level 1 moisture sensitivity | Enables standard reflow without dry-bag storage or baking; compatible with high-volume SMT assembly lines. |
| Halogen-free & RoHS-compliant | Meets JEDEC J-STD-609A Class 1 definition; supports environmental compliance for global automotive OEM programs. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine control modules against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching precision ADC front-end. Use Value: Maintains signal integrity by limiting transient overshoot to ≤12.0 V, preventing latch-up or damage to 5 V rail-tied op-amps and microcontroller inputs. |
Use Scenario: Safeguarding CAN_H and CAN_L differential pair traces in vehicle body control units exposed to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Low-capacitance TVS pair (one per line) providing symmetric clamping without distorting 1 Mbps CAN signaling waveform. Use Value: Enables robust EMC performance per ISO 11898-2 while maintaining <5 μA leakage to avoid bus bias shift or false dominant state. |
| Consumer USB Port ESD Protection | Power Supply Input Surge Suppression |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 D+ and D− lines in automotive infotainment head units. IC Role / Device Role / Timing Role: Fast-response TVS placed after primary polymer PTC, absorbing ±15 kV contact discharge per IEC 61000-4-2. Use Value: Sub-1 ns response time prevents ESD-induced data corruption; low VWM (7.0 V) avoids interference with 3.3 V USB PHY signaling. |
Use Scenario: Input-stage transient suppression on 12 V DC-DC converter rails powering ADAS camera modules. IC Role / Device Role / Timing Role: Primary surge clamp on unregulated input, coordinated with upstream fuse and downstream ceramic filtering. Use Value: 400 W rating handles ISO 16750-2 Pulse 5a (load dump) events; RθJA = 120 °C/W allows thermal design with minimal copper area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ7.0CAHE3_A/H | Same electrical specs but RoHS-compliant (E3) instead of halogen-free (HM3); no AEC-Q101 qualification. | Approved for commercial/industrial use only; not certified for automotive under-hood deployment. | Select when AEC-Q101 is not required and halogen-free content is not mandated by OEM material declaration. |
| SMBJ7.0CAHM3_A/H | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; higher PPPM (600 W), lower RθJA (80 °C/W). | Better thermal performance and surge margin; requires larger PCB footprint and different pad layout. | Choose when higher surge robustness or improved thermal dissipation is needed and board space permits SMB footprint. |
Compared with SMAJ7.0CAHM3_A/H, the HE3 variant lacks automotive qualification and halogen-free status, while the SMBJ7.0CAHM3_A/H offers superior power handling and thermal performance at the cost of increased size-making SMAJ7.0CAHM3_A/H optimal for space-constrained AEC-Q101-compliant designs.
Availability
SMAJ7.0CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus hardening, and consumer USB ESD mitigation requiring stable component supply across production lifecycles.
Supply support for SMAJ7.0CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMAJ series is engineered specifically for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What does the "HM3" suffix indicate in SMAJ7.0CAHM3_A/H?
The HM3 suffix denotes halogen-free, RoHS-compliant construction and AEC-Q101 qualification. It confirms the device meets automotive reliability standards and environmental compliance requirements including JEDEC J-STD-609A Class 1 and material declarations per Vishay Doc. #99912. SMAJ7.0CAHM3_A/H is fully validated for under-hood use.
Is SMAJ7.0CAHM3_A/H bidirectional, and how is polarity identified?
Yes, SMAJ7.0CAHM3_A/H is a bidirectional TVS diode-its "CA" suffix explicitly indicates symmetrical clamping in both directions. Unlike unidirectional variants, it carries no cathode band marking; both terminals are functionally identical, simplifying PCB layout and eliminating orientation errors during automated placement.
What is the maximum clamping voltage of SMAJ7.0CAHM3_A/H, and at what current is it specified?
The maximum clamping voltage (VC) of SMAJ7.0CAHM3_A/H is 12.0 V, measured at the peak pulse current (IPPM) of 33.3 A under a standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is guaranteed across the full operating temperature range.
Can SMAJ7.0CAHM3_A/H be used in place of a unidirectional SMAJ7.0A variant?
No-SMAJ7.0CAHM3_A/H is electrically and functionally distinct from unidirectional SMAJ7.0A. It provides symmetrical clamping for AC-coupled or floating lines, whereas SMAJ7.0A clamps only in reverse bias and conducts forward current. Substitution would compromise protection on bidirectional signals like CAN or USB and is not recommended without circuit redesign.
What is the thermal resistance and recommended mounting for optimal performance of SMAJ7.0CAHM3_A/H?
SMAJ7.0CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. For reliable 400 W surge handling, adhere strictly to this pad layout; reducing pad area increases junction temperature and risks thermal runaway during repetitive transients.
SMAJ7.0CAHM3_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):
- 7V
- Voltage - Breakdown (Min):
- 7.78V
- Voltage - Clamping (Max) @ Ipp:
- 12V
- Current - Peak Pulse (10/1000µs):
- 33.3A
- 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)
SMAJ7.0CAHM3_A/H FAQ
1.How can I place an order for SMAJ7.0CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ7.0CAHM3_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 SMAJ7.0CAHM3_A/H reliable?
The price and inventory of SMAJ7.0CAHM3_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 SMAJ7.0CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ7.0CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ7.0CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ7.0CAHM3_A/H?
SMAJ7.0CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ7.0CAHM3_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 SMAJ7.0CAHM3_A/H?
For technical support, including SMAJ7.0CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ7.0CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ7.0CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ7.0CAHM3_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 SMAJ7.0CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ7.0CAHM3_A/H?
All SMAJ7.0CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ7.0CAHM3_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 SMAJ7.0CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ7.0CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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