My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ12CA-M3/61
- Part No.:
- SMAJ12CA-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12CA-M3/61.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,697
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ12CA-M3/61 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 or power lines. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤19.9 V at 20.1 A peak pulse current under 10/1000 μs waveform - protecting sensitive ICs and MOSFETs in automotive and industrial control interfaces.
For engineers reviewing the SMAJ12CA-M3/61 datasheet, SMAJ12CA-M3/61 pinout, SMAJ12CA-M3/61 application, or SMAJ12CA-M3/61 equivalent, key selection criteria include bidirectional surge suppression capability, 400 W peak pulse power rating at ≤78 V, low clamping ratio (VC/VBR ≈ 1.45), and halogen-free RoHS-compliant construction per M3 suffix.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional CA configuration, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns) to ESD and lightning-induced transients.
The device delivers 400 W peak pulse power (10/1000 μs) up to 78 V, derating to 300 W above that threshold, with thermal resistance RθJA = 120 °C/W and maximum junction temperature of +150 °C. It meets J-STD-020 MSL Level 1 and supports reflow soldering up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping onset. |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | ≤19.9 V at IPPM = 20.1 A - Limits downstream voltage stress during 10/1000 μs surge, critical for 3.3 V/5 V logic interface protection. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Sustains high-energy transients without failure when mounted on 5.0 mm × 5.0 mm copper pads. |
| ID (Max Reverse Leakage) | 1.0 μA at VWM - Negligible standby current, preserving signal integrity and system power budget. |
| TJ max | +150 °C - Enables operation in under-hood automotive or industrial environments with elevated ambient temperatures. |
| Package | SMA (DO-214AC) - Low-profile surface-mount package compatible with automated placement and IPC-7351 standard footprints. |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case with matte tin-plated leads; no polarity marking for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 | One side of symmetrical PN junction; connects to protected line or node requiring bidirectional clamping. |
| Cathode | Terminal 2 | Other side of symmetrical PN junction; forms low-impedance path to ground or reference during either polarity transient. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity concerns. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) when properly laid out, reducing need for cascaded protection stages. |
| Low clamping voltage (VC/VBR ≈ 1.45) | Minimizes voltage overshoot across protected ICs, improving margin for 12 V-rated components like automotive microcontrollers. |
| Halogen-free & RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for automotive and industrial end equipment without compromising surge performance. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiles without baking, simplifying manufacturing logistics. |
Applications
| Automotive Body Control Module | Industrial RS-485 Communication Port |
|---|---|
Use Scenario: Protecting LIN bus transceivers and door module MCUs from load dump and inductive switching transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed between LIN line and ground to clamp ±100 V transients within nanoseconds. Use Value: Prevents latch-up or permanent damage to transceivers rated for only ±40 V absolute maximum, extending field reliability. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers connected to long cable runs exposed to EFT and surge events in factory automation. IC Role / Device Role / Timing Role: Placed across A/B differential pair to suppress common-mode surges while maintaining signal integrity up to 10 Mbps. Use Value: Maintains data link uptime by limiting voltage excursion to <20 V during 4 kV IEC 61000-4-5 surges, avoiding receiver saturation. |
| Consumer Appliance Motor Drive Interface | Telecom DSL Line Card Protection |
Use Scenario: Shielding MCU GPIOs and gate drivers controlling BLDC fans or compressors from back-EMF spikes during commutation. IC Role / Device Role / Timing Role: Connected from motor control signal line to chassis ground to absorb repetitive 100–500 V, 10/1000 μs inductive spikes. Use Value: Eliminates need for snubbers or optocouplers in cost-sensitive white goods, reducing BOM count and PCB area. |
Use Scenario: Front-end protection for ADSL/VDSL line interface ICs against lightning-induced surges entering via outdoor copper pairs. IC Role / Device Role / Timing Role: First-stage clamping device on tip/ring lines before transformer coupling and integrated line driver/receiver. Use Value: Limits surge energy delivered to downstream components, enabling use of smaller secondary protectors and lower-cost isolation transformers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12CA-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3). | Approved for commercial-grade industrial use; not qualified for halogen-free regulatory mandates (e.g., JEDEC J-STD-709). | Select when halogen-free requirement is not enforced and cost optimization is prioritized. |
| SMAJ12CAHM3_A/H | AEC-Q101 qualified variant with identical VWM/VC/PPPM; same M3 halogen-free construction plus automotive qualification. | Required for under-hood automotive modules where component-level AEC-Q101 validation is mandatory. | Choose for automotive OEM designs needing full qualification traceability and extended temperature validation. |
Compared with SMAJ12CA-M3/61, the E3 version offers identical surge performance at lower cost for non-automotive applications, while the HM3_A/H variant adds AEC-Q101 qualification for mission-critical automotive deployments - neither is pin-compatible with different packages, but all share SMA (DO-214AC) footprint and bidirectional functionality.
Availability
SMAJ12CA-M3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial communication ports, consumer appliance motor controls, and telecom line card protection requiring stable component supply and halogen-free compliance.
Supply support for SMAJ12CA-M3/61 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 and application-specific performance.
The SMAJ series targets robust transient suppression in space-constrained surface-mount designs, optimized for automotive, industrial, and telecom infrastructure where high pulse power and low clamping voltage are essential.
FAQ
What is the clamping voltage of SMAJ12CA-M3/61 at its rated peak pulse current?
The SMAJ12CA-M3/61 clamps to a maximum of 19.9 V at its specified peak pulse current of 20.1 A under the 10/1000 μs waveform. This value is measured per Figure 1 and Table 1 in Vishay Document 88390, confirming consistent voltage limiting behavior for downstream circuit protection. The SMAJ12CA-M3/61 achieves this with a clamping ratio of approximately 1.45 relative to its minimum breakdown voltage.
Is SMAJ12CA-M3/61 suitable for automotive applications?
SMAJ12CA-M3/61 is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For non-safety-critical automotive modules (e.g., infotainment or interior lighting), it is widely used; however, for engine bay or ADAS-related applications, the AEC-Q101-qualified variant SMAJ12CAHM3_A/H is required. The SMAJ12CA-M3/61 shares identical electrical specs and package with the qualified version, differing only in test certification scope.
How does the bidirectional design of SMAJ12CA-M3/61 affect its PCB layout?
The bidirectional nature of SMAJ12CA-M3/61 eliminates polarity orientation constraints during placement - no cathode band marking exists, and either terminal may connect to the protected line or ground reference. This simplifies layout for differential or AC-coupled traces and avoids assembly errors. The SMAJ12CA-M3/61 requires symmetric 5.0 mm × 5.0 mm copper pads per terminal to sustain its 400 W rating, per Vishay's recommended mounting pad layout.
What is the maximum reverse leakage current for SMAJ12CA-M3/61 at its stand-off voltage?
At its 12 V stand-off voltage (VWM), the SMAJ12CA-M3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA at 25 °C, as specified in Table 1 of Vishay Document 88390. This ultra-low leakage preserves signal integrity on high-impedance nodes and minimizes quiescent power loss in battery-powered systems. The SMAJ12CA-M3/61 maintains this spec across its full operating temperature range (−55 °C to +150 °C), with gradual increase per datasheet derating curves.
Can SMAJ12CA-M3/61 be used in place of a unidirectional TVS like SMAJ12A-M3/61?
No - SMAJ12CA-M3/61 is strictly bidirectional and lacks polarity marking, whereas SMAJ12A-M3/61 is unidirectional with a cathode band and forward voltage drop (~3.5 V at 25 A). Substituting them risks improper clamping on DC-biased lines or failure to conduct during negative transients. The SMAJ12CA-M3/61 must only replace other CA-suffixed variants; its circuit role is fundamentally different from unidirectional counterparts despite matching VWM and VC values.
SMAJ12CA-M3/61 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-M3/61 FAQ
1.How can I place an order for SMAJ12CA-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12CA-M3/61 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-M3/61 reliable?
The price and inventory of SMAJ12CA-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ12CA-M3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ12CA-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12CA-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12CA-M3/61?
SMAJ12CA-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12CA-M3/61 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-M3/61?
For technical support, including SMAJ12CA-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12CA-M3/61 requirements.
6.How does Aetrix verify that SMAJ12CA-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ12CA-M3/61 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-M3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ12CA-M3/61?
All SMAJ12CA-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12CA-M3/61, 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-M3/61 part is unused and in its original packaging.
Return procedure for SMAJ12CA-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ12CA-M3/61 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
