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Vishay General Semiconductor - Diodes Division SMAJ13CA-E3/61
- Part No.:
- SMAJ13CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ13CA-E3/61.pdf
- Description:
- TVS DIODE 13VWM 21.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,498
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Product details
Overview
SMAJ13CA-E3/61 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 13 V standoff voltage (VWM), 14.4–15.9 V breakdown range (VBR at 1 mA), 21.5 V maximum clamping voltage (VC) at 18.6 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform). It is used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems against ESD, lightning surges, and inductive switching transients.
For engineers reviewing the SMAJ13CA-E3/61 datasheet, SMAJ13CA-E3/61 pinout, SMAJ13CA-E3/61 application, or SMAJ13CA-E3/61 equivalent, key selection considerations include bidirectional clamping behavior, DO-214AC (SMA) package thermal performance, junction temperature derating above 25 °C, and compliance with AEC-Q101 when ordered with HE3 suffix.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 μA leakage at 13 V), then rapidly avalanches into low-impedance conduction when transient voltage exceeds VBR, limiting downstream voltage to ≤21.5 V at 18.6 A. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns).
Designed for surface-mount assembly on PCBs with 0.2" × 0.2" copper pads per terminal, it delivers 400 W peak pulse power up to 78 V and 300 W above 78 V, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 13 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 14.4–15.9 V at 1 mA - Verified avalanche onset range; ensures predictable turn-on during transients without premature conduction. |
| VC (Clamping Voltage) | 21.5 V at IPPM = 18.6 A - Maximum voltage seen by protected circuit during 10/1000 μs surge; critical for IC-level survivability. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Sustained energy absorption capability under standardized surge waveform; determines protection level against common transients. |
| IPPM (Peak Pulse Current) | 18.6 A - Peak current the device safely diverts during 10/1000 μs surge; directly linked to board layout and pad thermal mass. |
| TJmax | +150 °C - Maximum allowable junction temperature; sets upper limit for ambient + power dissipation design margin. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard FR-4 with minimum recommended copper pads; guides heatsinking requirements. |
Pinout & Package
Package: SMA (DO-214AC) - Surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0, MSL Level 1 (260 °C reflow), and JESD201 Class 2 whisker resistance. Bidirectional devices have no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction; conducts surge current in either direction when voltage exceeds |VBR|. |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical PN junction; completes low-impedance path to ground or rail during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC-coupled or floating signal lines without polarity concerns-no external biasing required. |
| 400 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity on 12 V systems with appropriate PCB layout. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage stress on downstream components-critical for 3.3 V/5 V logic and analog front-ends. |
| AEC-Q101 qualification option (HE3/HM3) | Validated for automotive under-hood and infotainment applications requiring zero-defect reliability and extended temperature cycling. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiles without baking-reduces manufacturing overhead and risk of popcorning. |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in engine control units. IC Role / Device Role / Timing Role: Shunt TVS diode placed between signal line and chassis ground, clamping transients within nanoseconds to prevent latch-up or gate oxide damage. Use Value: Maintains signal integrity during 100 V/50 ms load dump events while holding clamped voltage below 22 V-preserving ±15 V input tolerance of op-amps and transceivers. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Bidirectional clamp across input terminals, conducting surge current away from optocoupler input LED and series current-limiting resistor. Use Value: Withstands repeated 400 W surges without degradation, enabling >100,000 actuation cycles in factory automation environments. |
| Consumer USB Port ESD Protection | Telecom Ethernet PHY Line Protection |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines after primary polymer-based TVS, meeting IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Fast-response silicon TVS placed adjacent to connector, clamping sub-100 ns ESD events before they reach USB transceiver ESD structures. Use Value: 21.5 V clamping ensures <1 V overshoot beyond 20 V USB VBUS tolerance, preventing false disconnects and PHY latch-up. |
Use Scenario: Protecting 10/100BASE-TX transformer center taps and PHY pins from lightning-induced surges on outdoor Ethernet links. IC Role / Device Role / Timing Role: Bidirectional TVS connected between differential pair and ground, absorbing common-mode surges while preserving signal symmetry. Use Value: Low capacitance (<100 pF at 0 V) avoids signal integrity loss at 100 Mbps; 400 W rating supports Telcordia GR-1089-CORE Level 3 surge compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ13A-E3/61 | Unidirectional version; cathode band marked; forward voltage drop (~3.5 V at 25 A) present in one polarity. | Requires correct polarity placement; unsuitable for AC or floating lines without external biasing. | Select only when protecting DC rails with known polarity and where forward conduction must be blocked in one direction. |
| SMBJ13CA-E3/52 | Same VWM/VBR/VC specs but in larger SMB (DO-214AA) package; higher PPPM = 600 W; RθJA = 80 °C/W. | Better thermal handling for high-duty-cycle surges; requires larger PCB footprint and different tape/reel packaging (52 vs. 61). | Choose when system-level surge testing exceeds 400 W or when board layout allows larger footprint and improved thermal margin is needed. |
Compared with SMAJ13CA-E3/61, the unidirectional SMAJ13A-E3/61 demands strict polarity alignment and adds forward conduction risk, while the SMBJ13CA-E3/52 trades compactness for higher surge capacity and lower thermal resistance-making SMAJ13CA-E3/61 optimal for space-constrained, bidirectional, medium-energy protection.
Availability
SMAJ13CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer USB ports, and telecom Ethernet PHY protection requiring stable component supply, RoHS-compliant commercial-grade sourcing, and consistent tape-and-reel delivery.
Supply support for SMAJ13CA-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, precision, and application-specific optimization.
The SMAJ series was developed for high-reliability, surface-mount transient suppression in automotive, industrial, and communications equipment-balancing compact size, fast response, and repeatable clamping performance under harsh electrical stress.
FAQ
What is the clamping voltage of SMAJ13CA-E3/61 at its rated peak pulse current?
The SMAJ13CA-E3/61 has a maximum clamping voltage (VC) of 21.5 V at its specified peak pulse current (IPPM) of 18.6 A, measured under the standard 10/1000 μs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and confirms the device's ability to limit transient overvoltage to a safe level for downstream 24 V-rated components. The SMAJ13CA-E3/61 achieves this with minimal voltage overshoot due to its low dynamic impedance.
Is SMAJ13CA-E3/61 suitable for automotive applications?
SMAJ13CA-E3/61 is RoHS-compliant and qualified to commercial temperature grade (–55 °C to +150 °C), but it is not AEC-Q101 qualified in the E3/61 configuration. For automotive use, specify SMAJ13CAHE3_A or SMAJ13CAHM3_A-these variants include full AEC-Q101 stress testing and are marked with HE3 or HM3 suffixes. The SMAJ13CA-E3/61 remains appropriate for non-safety-critical, interior consumer electronics in vehicles where qualification is not mandated.
How does the bidirectional design of SMAJ13CA-E3/61 affect PCB layout?
The bidirectional nature of SMAJ13CA-E3/61 eliminates polarity constraints: no cathode band marking exists, and the device functions identically regardless of orientation across the protected line. This simplifies automated placement, reduces assembly errors, and enables use on AC-coupled or floating differential pairs (e.g., RS-485, CAN) without additional diodes or bias networks. Layout still requires symmetric 0.2" × 0.2" copper pads per terminal to meet the 400 W pulse rating. The SMAJ13CA-E3/61 thus streamlines routing and improves yield in high-volume manufacturing.
What is the maximum leakage current of SMAJ13CA-E3/61 at its standoff voltage?
At its rated standoff voltage (VWM) of 13 V and ambient temperature of 25 °C, the SMAJ13CA-E3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA. This ultra-low leakage ensures negligible standby power loss and prevents false triggering in high-impedance circuits such as sensor bias networks or microcontroller wake-up inputs. Leakage remains below 5 μA up to 80 % of VWM, supporting stable operation in battery-powered and precision analog systems using the SMAJ13CA-E3/61.
Can SMAJ13CA-E3/61 replace SMAJ13A-E3/61 in an existing design?
No-SMAJ13CA-E3/61 and SMAJ13A-E3/61 are not functionally interchangeable without layout review. SMAJ13A-E3/61 is unidirectional and marked with a cathode band; reversing it causes catastrophic failure under reverse surge. SMAJ13CA-E3/61 is bidirectional and unmarked. Swapping requires verifying that the protection topology relies on bidirectional clamping (e.g., across differential lines or AC signals) and confirming that no forward-biased conduction path exists. The SMAJ13CA-E3/61 introduces no polarity dependency but alters surge current return paths.
SMAJ13CA-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):
- 13V
- Voltage - Breakdown (Min):
- 14.4V
- Voltage - Clamping (Max) @ Ipp:
- 21.5V
- Current - Peak Pulse (10/1000µs):
- 18.6A
- 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)
SMAJ13CA-E3/61 FAQ
1.How can I place an order for SMAJ13CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ13CA-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 SMAJ13CA-E3/61 reliable?
The price and inventory of SMAJ13CA-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 SMAJ13CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ13CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ13CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ13CA-E3/61?
SMAJ13CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ13CA-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 SMAJ13CA-E3/61?
For technical support, including SMAJ13CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ13CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ13CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ13CA-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 SMAJ13CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ13CA-E3/61?
All SMAJ13CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ13CA-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 SMAJ13CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ13CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ13CA-E3/61 Tags
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