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Vishay General Semiconductor - Diodes Division SMAJ70CA-E3/61
- Part No.:
- SMAJ70CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CA-E3/61.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ70CA-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 and power lines. It features a 70 V standoff voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 113 V maximum clamping voltage (VC) at 3.5 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 SMAJ70CA-E3/61 datasheet, SMAJ70CA-E3/61 pinout, SMAJ70CA-E3/61 application, or SMAJ70CA-E3/61 equivalent, key selection considerations include bidirectional surge suppression capability, 150 °C max junction temperature, RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior in forward and reverse directions. Its glass-passivated junction enables fast response time (<1 ps), low incremental surge resistance, and stable performance under repetitive 0.01% duty cycle surges.
The device complies with ANSI/IEEE C62.35 and meets UL 497B recognition (QVGQ2). It is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead) when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering during transients. |
| VC @ IPPM | 113 V at 3.5 A - Clamped voltage during 10/1000 μs surge; limits stress on downstream components. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; supports high-energy ESD and load-switching events. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against inrush or fault currents. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-temperature industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with standard SMT reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant, no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One side of symmetrical PN junction; connects to protected line without polarity constraint in bidirectional mode. |
| Cathode | Terminal K | Other side of symmetrical PN junction; functionally identical to Anode in SMAJ70CA-E3/61 due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions - eliminates need for polarity-aware layout in AC-coupled or floating signal paths. |
| 400 W peak pulse power | Rated per 10/1000 μs waveform at TA = 25 °C - handles high-energy transients from inductive switching or lightning-induced surges. |
| Glass passivated junction | Enables <1 ps response time and stable leakage (<1 μA at VWM) - critical for protecting high-impedance sensor inputs and precision analog circuits. |
| RoHS-compliant & MSL Level 1 | Matte tin terminals, J-STD-002 solderability, and 260 °C peak reflow tolerance - ensures compatibility with lead-free manufacturing and long-term reliability. |
| AEC-Q101 qualification option | Available as SMAJ70CAHE3_X variant - validated for automotive applications requiring stress-tested reliability beyond commercial grade. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppresses load-dump spikes (up to 120 V) and alternator ripple on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between power rail and ground, responding within picoseconds to overvoltage events. Use Value: Limits rail voltage to ≤113 V during 3.5 A surge, preventing damage to 3.3 V/5 V microcontrollers and CAN transceivers. |
Use Scenario: Shields analog outputs of pressure/temperature sensors from ESD and cable discharge events in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF at 0 V) shunt protector on 0–10 V or 4–20 mA signal lines. Use Value: Maintains signal integrity with <1 μA leakage at 70 V, while clamping 8 kV contact ESD per IEC 61000-4-2 to safe levels. |
| Telecom Data Line Surge Suppression | Consumer Device USB Port Protection |
|
Use Scenario: Protects RS-485 transceivers in base station backhaul links from induced lightning surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Symmetrical TVS pair (one per line) referenced to common-mode ground, absorbing differential and common-mode transients. Use Value: Withstands 400 W pulses without degradation, enabling compliance with ITU-T K.20 and Telcordia GR-1089-CORE requirements. |
Use Scenario: Guards USB 2.0 D+/D- lines in smart home hubs against human-body-model (HBM) ESD and connector hot-plug transients. IC Role / Device Role / Timing Role: Low-leakage bidirectional clamp placed before USB PHY, minimizing capacitive loading on high-speed data paths. Use Value: Delivers <113 V clamping at 3.5 A while adding only ~100 pF capacitance - preserves signal rise/fall times and eye diagram integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/61 | Unidirectional version; cathode band marked; same VWM/VBR/VC specs but asymmetric conduction. | Required where DC-biased lines need polarity-specific clamping (e.g., single-supply power rails). | Select SMAJ70A-E3/61 only if circuit topology enforces fixed polarity and benefits from lower forward voltage drop in one direction. |
| SMBJ70CA-E3/52 | Same electrical specs but SMB (DO-214AA) package - 3.99 mm wide vs. SMA's 4.50 mm; 600 W PPPM rating. | Higher power handling and slightly larger footprint; better suited for higher-current industrial power rails. | Choose SMBJ70CA-E3/52 when board space allows and surge current exceeds 3.5 A, leveraging its 600 W rating and lower RθJA. |
Compared with SMAJ70CA-E3/61, the unidirectional SMAJ70A-E3/61 offers directional conduction but requires polarity-aware layout, while the SMBJ70CA-E3/52 provides 50% higher pulse power and improved thermal dissipation at the cost of larger PCB area - making SMAJ70CA-E3/61 optimal for compact, polarity-agnostic protection on mid-power signal lines.
Availability
SMAJ70CA-E3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom data lines, and consumer USB port protection requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ70CA-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 surface-mount transient suppression in space-constrained, high-reliability applications - engineered for rapid response, repeatable clamping, and compatibility with automated manufacturing across automotive, industrial, and communications markets.
FAQ
What is the maximum clamping voltage of SMAJ70CA-E3/61 under a 10/1000 μs surge?
The SMAJ70CA-E3/61 has a maximum clamping voltage (VC) of 113 V when subjected to its rated peak pulse current of 3.5 A with a 10/1000 μs waveform. This value is measured per Figure 1 in the Vishay datasheet 88390 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ70CA-E3/61 maintains this clamping performance bidirectionally, ensuring consistent protection regardless of surge polarity.
Is SMAJ70CA-E3/61 suitable for automotive applications?
SMAJ70CA-E3/61 is qualified for commercial-grade automotive use, with an operating junction temperature range of -55 °C to +150 °C and MSL Level 1 moisture sensitivity. While the base part is not AEC-Q101 certified, Vishay offers the pin-compatible SMAJ70CAHE3_X variant with full AEC-Q101 qualification. For non-safety-critical modules like infotainment or body electronics, SMAJ70CA-E3/61 provides robust transient suppression; however, safety-critical systems require the HE3 suffix version. The SMAJ70CA-E3/61 remains widely deployed in automotive ECUs where commercial-grade reliability suffices.
How does the bidirectional design of SMAJ70CA-E3/61 affect PCB layout?
The SMAJ70CA-E3/61 has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout by removing the need for silkscreen polarity indicators or automated vision alignment checks. Engineers can route protected lines symmetrically without regard to anode/cathode assignment, reducing design iteration time and assembly errors. Unlike unidirectional variants such as SMAJ70A-E3/61, the SMAJ70CA-E3/61 supports AC-coupled, floating, or differential signal paths without additional external components - a key advantage in RS-485, CAN FD, or audio interface protection.
What is the thermal resistance of SMAJ70CA-E3/61, and how does it impact power derating?
SMAJ70CA-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads. At ambient temperatures above 25 °C, its 400 W peak pulse power must be derated per Figure 2 in datasheet 88390 - e.g., at 75 °C ambient, usable PPPM drops to ~280 W. Continuous power dissipation is limited to 3.3 W, so sustained surge repetition requires careful thermal management. The SMAJ70CA-E3/61's thermal profile supports short-duration transients but not steady-state overvoltage conditions.
Does SMAJ70CA-E3/61 meet industry standards for surge immunity testing?
Yes, SMAJ70CA-E3/61 meets ANSI/IEEE C62.35 for transient voltage suppressors and carries UL 497B recognition (file E136766) for telecommunications protectors. Its 400 W 10/1000 μs rating aligns with IEC 61000-4-5 (surge immunity) Level 3–4 test profiles, and its <1 μA leakage at 70 V supports IEC 61000-4-2 ESD compliance when used with appropriate series impedance. The SMAJ70CA-E3/61 is routinely deployed in designs targeting EN 55032, CISPR 32, and ISO 7637-2 conformance - particularly for coupled surge suppression on 12 V/24 V vehicle networks and industrial fieldbus interfaces.
SMAJ70CA-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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- 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)
SMAJ70CA-E3/61 FAQ
1.How can I place an order for SMAJ70CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CA-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 SMAJ70CA-E3/61 reliable?
The price and inventory of SMAJ70CA-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 SMAJ70CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ70CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CA-E3/61?
SMAJ70CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CA-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 SMAJ70CA-E3/61?
For technical support, including SMAJ70CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ70CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ70CA-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 SMAJ70CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ70CA-E3/61?
All SMAJ70CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CA-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 SMAJ70CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ70CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70CA-E3/61 Tags
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