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Vishay General Semiconductor - Diodes Division SMAJ12CA-E3/61
- Part No.:
- SMAJ12CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12CA-E3/61.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ12CA-E3/61 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for clamping voltage transients on signal and power lines. It features a 12 V standoff voltage (VWM), 19.9 V maximum clamping voltage (VC) at 20.1 A peak pulse current, and 400 W peak pulse power rating with a 10/1000 μs waveform - optimized for protecting MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ12CA-E3/61 datasheet, SMAJ12CA-E3/61 pinout, SMAJ12CA-E3/61 application, or SMAJ12CA-E3/61 equivalent, key selection criteria include bidirectional surge clamping capability, SMA (DO-214AC) package compatibility with automated SMT assembly, AEC-Q101 qualification eligibility, and thermal resistance (RθJA = 120 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamping protector in both polarities, leveraging an avalanche breakdown mechanism to limit transient overvoltages before they damage downstream circuitry. Its bidirectional symmetry ensures identical electrical behavior across positive and negative surges, eliminating polarity dependency in AC-coupled or floating signal paths.
The SMAJ12CA-E3/61 delivers fast response time (<1 ps), low incremental surge resistance, and stable clamping performance up to 150 °C junction temperature. It meets J-STD-020 MSL Level 1 moisture sensitivity and supports reflow soldering with a 260 °C peak temperature profile - critical for high-reliability automotive and industrial PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected line. |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - Verified breakdown threshold ensures reliable triggering above normal operating voltage. |
| VC @ IPPM | 19.9 V at 20.1 A - Clamped voltage during 10/1000 μs surge; determines maximum stress on downstream components. |
| PPPM | 400 W - Peak pulse power handling capacity; enables robust protection against inductive switching and ESD events. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports unidirectional fault tolerance if used in hybrid configurations. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating requirements above 25 °C ambient. |
| TJ max | +150 °C - Maximum allowable junction temperature; sets upper limit for thermal design margin in enclosed environments. |
Pinout & Package
Package: SMA (DO-214AC) - surface-mount, low-profile plastic case with matte tin-plated leads; compliant with J-STD-002 and JESD 22-B102 solderability standards. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical avalanche junction; accepts reverse surge current during negative transients. |
| Cathode | Transient current entry (positive polarity) | Second terminal of symmetrical avalanche junction; accepts reverse surge current during positive transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware placement in AC or floating circuits. |
| 400 W peak pulse power | Rated per 10/1000 μs waveform - handles typical load-switching transients without degradation under repetitive duty cycle ≤0.01 %. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60 % RH - supports just-in-time SMT assembly without baking preconditioning. |
| AEC-Q101 qualification path | Available in HE3/HM3 variants - enables direct qualification path for automotive applications requiring stress-tested TVS devices. |
| Low clamping ratio | VC/VWM = 1.66 - tight voltage margin between operating and clamping thresholds improves system-level surge immunity. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting LIN bus and 12 V power rails in body control modules from load dump and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching MCU or transceiver. Use Value: Limits transient voltage to ≤19.9 V during 20.1 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. |
Use Scenario: Shielding analog outputs and digital I/O of pressure/temperature sensors in PLC I/O modules from field wiring transients. IC Role / Device Role / Timing Role: Fast-response TVS placed adjacent to connector pins to suppress EFT bursts and lightning-induced surges on 24 V signal lines. Use Value: Sub-20 ns response time and 120 °C/W thermal resistance enable sustained operation in DIN-rail mounted enclosures up to 85 °C ambient. |
| Consumer USB Port ESD Protection | Telecom Data Line Surge Suppression |
|
Use Scenario: Safeguarding USB 2.0 D+/D− lines in set-top boxes and smart displays against human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp integrated into USB connector footprint to minimize signal integrity impact. Use Value: Maintains <10 pF junction capacitance at VWM, preserving signal rise/fall times while meeting IEC 61000-4-2 ±15 kV contact discharge requirements. |
Use Scenario: Protecting RS-485 transceivers and Ethernet PHYs in network edge devices from induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary front-end TVS on differential pair inputs to absorb common-mode transients before signal conditioning stages. Use Value: Symmetrical clamping ensures balanced suppression across A/B lines, preserving differential signaling integrity during 400 W surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/61 | Unidirectional variant with cathode band marking; same VWM, VC, and PPPM. | Requires polarity-aware PCB layout; unsuitable for AC or floating signal paths. | Select only when circuit topology enforces fixed DC polarity and space constraints favor single-direction protection. |
| SMBJ12CA-E3/52 | Same VWM and bidirectional function but in SMB (DO-214AA) package; 600 W PPPM rating. | Larger footprint (4.6 mm × 3.96 mm vs. 4.5 mm × 2.79 mm); higher thermal mass supports higher surge repetition rates. | Choose when system-level surge testing exceeds 400 W or when board layout allows larger package for improved thermal margin. |
Compared with SMAJ12A-E3/61, the SMAJ12CA-E3/61 enables polarity-agnostic placement and simplifies layout for differential or AC-coupled signals; versus SMBJ12CA-E3/52, it trades peak power headroom for tighter board area usage in space-constrained consumer and telecom modules.
Availability
SMAJ12CA-E3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, consumer USB ports, and telecom data line protection requiring stable component supply across production lifecycles.
Supply support for SMAJ12CA-E3/61 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 optimization.
The SMAJ series targets cost-sensitive, high-volume transient suppression needs in automotive, industrial, and consumer markets - delivering standardized TVS performance in compact, automated-assembly-ready packages.
FAQ
What is the clamping voltage of SMAJ12CA-E3/61 at its rated peak pulse current?
The SMAJ12CA-E3/61 has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPPM) of 20.1 A, measured using the industry-standard 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in Vishay's official datasheet revision 09-Jan-2024 (Document Number: 88390). The SMAJ12CA-E3/61 maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMAJ12CA-E3/61 RoHS-compliant and halogen-free?
Yes, SMAJ12CA-E3/61 carries the "E3" suffix, indicating it is RoHS-compliant and commercial-grade per Vishay's ordering nomenclature. It is not halogen-free; that designation requires the "M3" suffix (e.g., SMAJ12CA-M3/61). The E3 variant uses matte tin-plated leads and meets JESD 201 Class 2 whisker resistance, with molding compound rated UL 94 V-0. The SMAJ12CA-E3/61 complies with EU RoHS Directive 2011/65/EU and related substance restrictions as documented in Vishay's material declarations.
Does SMAJ12CA-E3/61 have AEC-Q101 qualification?
No, SMAJ12CA-E3/61 itself is not AEC-Q101 qualified; however, Vishay offers AEC-Q101-qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ12CAHE3_A/H). These variants undergo additional stress testing per AEC-Q101 Rev D and are designated for automotive applications. The SMAJ12CA-E3/61 shares identical electrical and mechanical specifications with its HE3 counterpart but lacks the formal qualification documentation required for automotive Tier 1 supply chains. Engineers selecting for automotive use must specify the HE3 or HM3 variant explicitly.
What is the thermal resistance of SMAJ12CA-E3/61, and how does it affect PCB layout?
The SMAJ12CA-E3/61 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, as specified in Vishay's datasheet. This value assumes minimal copper area and guides minimum pad sizing for thermal management. To maintain safe junction temperatures below 150 °C under repeated surges, designers should avoid excessive trace length, ensure solid thermal vias beneath pads, and consider ambient temperature derating - especially in enclosed industrial enclosures. The SMAJ12CA-E3/61's RθJA directly impacts allowable surge repetition rate and long-term reliability.
How does SMAJ12CA-E3/61 differ from unidirectional SMAJ12A-E3/61 in circuit implementation?
The SMAJ12CA-E3/61 is bidirectional with no polarity marking, enabling symmetric placement across AC-coupled, differential, or floating signal lines - such as RS-485 buses or audio inputs - where voltage transients may swing positive or negative. In contrast, SMAJ12A-E3/61 is unidirectional, marked with a cathode band, and must be oriented to match DC bias direction; incorrect orientation renders it nonfunctional for reverse surges. Both share identical VWM (12 V), VC (19.9 V), and PPPM (400 W), but only the SMAJ12CA-E3/61 supports true dual-polarity clamping without layout constraints.
SMAJ12CA-E3/61 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 20.1A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ12CA-E3/61 FAQ
1.How can I place an order for SMAJ12CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12CA-E3/61 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 SMAJ12CA-E3/61 reliable?
The price and inventory of SMAJ12CA-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ12CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ12CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12CA-E3/61?
SMAJ12CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12CA-E3/61 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 SMAJ12CA-E3/61?
For technical support, including SMAJ12CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ12CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ12CA-E3/61 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 SMAJ12CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ12CA-E3/61?
All SMAJ12CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12CA-E3/61, 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 SMAJ12CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ12CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ12CA-E3/61 Tags
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