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Vishay General Semiconductor - Diodes Division SMAJ26CA-E3/61
- Part No.:
- SMAJ26CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CA-E3/61.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ26CA-E3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 26 V standoff voltage (VWM), 28.9–31.9 V breakdown voltage (VBR) at 1 mA, 42.1 V maximum clamping voltage (VC) at 9.5 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ26CA-E3/61 datasheet, SMAJ26CA-E3/61 pinout, SMAJ26CA-E3/61 application, or SMAJ26CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, 26 V working voltage compatibility with 3.3 V/5 V/24 V rail protection, low leakage (<1 μA at VWM), AEC-Q101 qualification eligibility (via HE3 suffix variants), and surface-mount compatibility with automated placement on PCBs with 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector: under normal conditions it presents high impedance (>1 MΩ) with <1 μA reverse leakage at 26 V; during transient events exceeding VBR, it avalanches into low-impedance conduction within <1 ns to limit voltage to ≤42.1 V. Its bidirectional symmetry enables use on AC-coupled or floating lines without polarity concerns.
The SMAJ26CA-E3/61 leverages glass-passivated junction technology for stable breakdown characteristics and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), requiring thermal pad design per Vishay's recommended 0.2" × 0.2" copper layout for full 400 W rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR (min/max) | 28.9 V / 31.9 V at 1 mA - Confirmed breakdown range defining turn-on threshold; ensures reliable clamping above normal operating margin. |
| VC @ IPPM | 42.1 V at 9.5 A - Clamped voltage during 10/1000 μs surge; determines maximum stress on downstream components. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; defines transient energy absorption capacity. |
| IPPM | 9.5 A - Peak surge current corresponding to VC; used to size PCB traces and verify system-level surge compliance. |
| TJ max. | +150 °C - Maximum junction temperature; constrains ambient and power dissipation in enclosed or high-temp environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 2.54 mm lead pitch; compatible with standard SMT pick-and-place and reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 compliant. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode band not marked (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts during negative-going surges; connects to line being protected (e.g., signal return or low-side rail). |
| Cathode | Transient current entry (positive half-cycle) | Conducts during positive-going surges; connects to line being protected (e.g., signal or supply rail). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables symmetric protection on AC, differential, or floating nodes without polarity constraints - critical for RS-485, CAN, or sensor bridge outputs. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges with margin when mounted on 5.0 mm × 5.0 mm copper pads. |
| Fast response time < 1 ns | Clamps transients before sensitive logic or analog circuitry sustains damage - essential for protecting microcontrollers and ADC inputs. |
| Low incremental surge resistance | Minimizes VC overshoot during high di/dt events, improving clamping precision over competing TVS devices. |
| AEC-Q101 qualification path | HE3/HM3 variants available - supports automotive subsystems requiring qualified components (e.g., body control modules, ADAS sensors). |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor output and ground to shunt transients before reaching ADC input stage. Use Value: Maintains signal integrity by limiting voltage to ≤42.1 V during 100 A/50 ms load dump events, preventing ADC saturation or latch-up. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from inductive kickback caused by relay coil switching. IC Role / Device Role / Timing Role: Transient suppressor connected between input terminal and common rail to absorb 400 W surge energy within nanoseconds. Use Value: Eliminates false triggering and extends optocoupler lifetime by clamping spikes to safe levels without adding series resistance or delay. |
| Consumer USB Port ESD Protection | Telecom Line Interface Protection |
Use Scenario: Safeguarding USB 2.0 D+/D− lines in set-top boxes against human-body-model (HBM) ESD up to ±15 kV. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed directly at connector to divert ESD current away from USB transceiver. Use Value: Provides sub-1 ns response and <0.5 pF junction capacitance (per Vishay Fig. 4), preserving signal rise/fall times and USB 480 Mbps compliance. |
Use Scenario: Protecting Ethernet PHY interface pins (e.g., MDI pairs) in VoIP gateways from lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary clamping device on transformer secondary side, coordinated with gas discharge tube (GDT) for staged protection. Use Value: Limits induced common-mode voltage to <45 V during 10/700 μs telecom surges, preventing PHY latch-up while maintaining IEEE 802.3 compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CA | Same VWM/VBR/VC, but SMB (DO-214AA) package - 3.5 mm wider, higher thermal mass, 600 W PPPM. | Higher power handling suits 48 V industrial buses; larger footprint may conflict with dense layouts. | Select SMBJ26CA only if board space allows and >400 W surge margin is required. |
| SMCJ26CA | Same electrical specs, SMC (DO-214AB) package - 7.1 mm wide, 1500 W PPPM, RθJA = 25 °C/W. | Used in high-energy telecom or railway applications; requires significantly more PCB area and thermal relief. | Choose SMCJ26CA for mission-critical infrastructure where single-event failure is unacceptable. |
Compared with SMBJ26CA and SMCJ26CA, the SMAJ26CA-E3/61 offers optimal balance of compact size, 400 W surge capability, and automated assembly compatibility - making it preferred for space-constrained automotive ECUs and consumer electronics where cost and footprint are prioritized over ultra-high energy ratings.
Availability
SMAJ26CA-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer USB port protection, and telecom line interface circuits requiring stable component supply, RoHS-compliant sourcing, and consistent tape-and-reel delivery.
Supply support for SMAJ26CA-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, automotive qualification, and high-volume manufacturability.
The SMAJ series was developed for surface-mount transient suppression in space-sensitive, high-reliability applications - targeting automotive, industrial, and communications markets where fast-response, bidirectional clamping and AEC-Q101 readiness are mandatory.
FAQ
What is the maximum clamping voltage of SMAJ26CA-E3/61 under a 10/1000 μs surge?
The SMAJ26CA-E3/61 has a maximum clamping voltage (VC) of 42.1 V at 9.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88390. It defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMAJ26CA-E3/61 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMAJ26CA-E3/61 suitable for automotive applications?
Yes, SMAJ26CA-E3/61 is RoHS-compliant and manufactured to Vishay's commercial-grade specifications; AEC-Q101 qualified versions are available under ordering codes SMAJ26CAHE3_X (e.g., HE3 suffix). While the E3/61 variant itself is not pre-qualified, its construction - glass-passivated junction, MSL Level 1 rating, and -55 °C to +150 °C operating range - aligns with automotive environmental requirements. For production automotive use, specify the HE3 or HM3 suffix variants, which undergo full AEC-Q101 stress testing including HTGB, TCT, and ESD. The SMAJ26CA-E3/61 serves as a direct drop-in for prototyping and non-safety-critical subsystems.
How does the bidirectional configuration of SMAJ26CA-E3/61 affect its PCB layout?
The SMAJ26CA-E3/61 has no polarity marking (no cathode band) due to its bidirectional design, simplifying PCB layout by eliminating orientation checks during automated placement. It must be placed across the protected line and reference plane (e.g., signal-to-ground or differential pair), with both terminals equally capable of conducting surge current in either direction. Layout best practices require symmetrical 5.0 mm × 5.0 mm copper pads per terminal to achieve full 400 W rating, minimal trace inductance, and thermal relief - unlike unidirectional TVS diodes that demand strict anode/cathode routing. This symmetry makes the SMAJ26CA-E3/61 ideal for differential interfaces like RS-485 or CAN FD.
What is the reverse leakage current of SMAJ26CA-E3/61 at its rated standoff voltage?
At VWM = 26 V and TA = 25 °C, the SMAJ26CA-E3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA, as specified in Vishay's Electrical Characteristics table. This low leakage ensures negligible power loss and signal distortion in always-on circuits such as sensor bias networks or battery-backed monitoring lines. Leakage remains below 5 μA up to 80 % of VWM and increases predictably near VBR; it is verified per JEDEC test methods and applies to both directions due to the device's bidirectional symmetry. This parameter is critical for low-power IoT endpoints using the SMAJ26CA-E3/61.
Can SMAJ26CA-E3/61 replace SMAJ26A in a design?
No - SMAJ26CA-E3/61 and SMAJ26A are not interchangeable without validation. SMAJ26A is unidirectional (cathode-banded), with forward voltage drop (~3.5 V at 25 A) and asymmetric clamping behavior; SMAJ26CA-E3/61 is bidirectional, with no forward conduction path and identical clamping in both polarities. Substituting one for the other risks incorrect surge diversion, increased leakage on DC rails, or failure to protect AC-coupled signals. If replacing SMAJ26A, confirm the circuit requires bidirectional suppression (e.g., floating lines, AC signals) and revalidate clamping margins, thermal layout, and PCB polarity markings. The SMAJ26CA-E3/61 is not a drop-in replacement for SMAJ26A.
SMAJ26CA-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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 9.5A
- 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)
SMAJ26CA-E3/61 FAQ
1.How can I place an order for SMAJ26CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CA-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 SMAJ26CA-E3/61 reliable?
The price and inventory of SMAJ26CA-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 SMAJ26CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ26CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CA-E3/61?
SMAJ26CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CA-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 SMAJ26CA-E3/61?
For technical support, including SMAJ26CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ26CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ26CA-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 SMAJ26CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ26CA-E3/61?
All SMAJ26CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CA-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 SMAJ26CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ26CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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