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Vishay General Semiconductor - Diodes Division SMAJ8.5C-E3/5A
- Part No.:
- SMAJ8.5C-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5C-E3/5A.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,749
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Product details
Overview
SMAJ8.5C-E3/5A from Vishay General Semiconductor is a bi-directional surface-mount Transient Voltage Suppressor (TVS) in DO-214AC (SMA) package, designed for clamping voltage transients on signal or power lines. It features 8.5 V stand-off voltage (VWM), 15.9 V maximum clamping voltage (VC) at 25.2 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting sensor interfaces and microcontroller I/O lines in automotive and industrial control systems.
For engineers reviewing the SMAJ8.5C-E3/5A datasheet, SMAJ8.5C-E3/5A pinout, SMAJ8.5C-E3/5A application, or SMAJ8.5C-E3/5A equivalent, this page delivers verified electrical parameters, bi-directional clamping behavior, thermal resistance data, RoHS-compliant packaging details, and direct alternative part comparisons for ESD and surge protection design-in.
Technical Context
This bi-directional TVS diode operates symmetrically in both polarities, with breakdown voltage (VBR) specified between 9.44 V and 11.5 V at 1.0 mA test current. Its low clamping ratio (VC/VWM = 1.87) ensures effective overvoltage suppression during transient events such as ESD or inductive switching spikes.
Thermal performance is defined by RθJA = 120 °C/W (junction-to-ambient) and RθJL = 30 °C/W (junction-to-lead), supporting reliable operation up to TJ = +150 °C. The device meets MSL level 1 per J-STD-020 and withstands solder reflow at 260 °C for 40 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range. |
| VC @ IPPM | 15.9 V - Clamped voltage at 25.2 A peak pulse current; limits downstream IC stress during 10/1000 µs transients. |
| IPPM | 25.2 A - Peak surge current capability under standard 10/1000 µs waveform; determines survivability against common surges. |
| PPPM | 400 W - Peak pulse power dissipation; enables robust protection without derating below 78 V nominal VWM. |
| TJ Range | –55 °C to +150 °C - Operating and storage junction temperature range; supports under-hood automotive and industrial environments. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 0.208" x 0.157" footprint; compatible with automated placement and reflow. |
| RoHS Compliance | E3 suffix - Meets EU Directive 2002/95/EC; matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards. |
Pinout & Package
DO-214AC (SMA) package: two-terminal, bi-directional device with no polarity marking; symmetrical construction eliminates cathode/anode distinction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Transient current path | Either terminal conducts during positive or negative overvoltage events; no DC bias dependency. |
| Cathode Band (absent) | N/A - Bi-directional configuration | No marking required; terminals are functionally identical for surge conduction in both directions. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 400 W peak pulse power | Supports high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without failure in automotive ECUs. |
| Low clamping voltage (15.9 V) | Keeps protected ICs (e.g., CAN transceivers, ADC inputs) within absolute maximum ratings during surge events. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles without baking; simplifies SMT manufacturing flow. |
| 1.0 µA max leakage @ VWM | Minimizes standby power loss and avoids signal distortion in high-impedance sensor front-ends. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of engine coolant temperature sensors exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bi-directional TVS placed across signal and ground to clamp ±200 V transients induced by relay switching. Use Value: Prevents latch-up or gate oxide damage in downstream op-amps and ADC drivers while maintaining <1 µA leakage at 5 V nominal signal range. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring surge coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between input terminal and chassis ground to suppress fast-rising lightning-induced surges. Use Value: Limits clamped voltage to 15.9 V, ensuring compatibility with 24 V tolerant Schmitt-trigger inputs and avoiding false triggering. |
| USB Port ESD Protection | RS-485 Data Line Surge Suppression |
Use Scenario: Safeguarding USB 2.0 D+/D− lines against human-body-model (HBM) ESD events up to ±15 kV. IC Role / Device Role / Timing Role: Low-capacitance bi-directional TVS placed differentially across data pair to absorb ESD without signal integrity degradation. Use Value: Achieves sub-100 pF junction capacitance at VWM, preserving USB full-speed eye diagram margin and meeting IEC 61000-4-2 Level 4. |
Use Scenario: Hardening RS-485 transceiver bus pins against induced surges in factory automation cabling runs. IC Role / Device Role / Timing Role: Bidirectional TVS installed between A/B differential lines and ground to shunt common-mode transients. Use Value: Withstands 400 W pulses per 10/1000 µs, enabling compliance with IEC 61000-4-5 (2nd edition) 1 kV surge testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5CA-E3/5A | Same electrical specs and DO-214AC package; CA suffix denotes bi-directional variant with identical VWM, VC, and IPPM. | No functional difference; CA and C suffixes are interchangeable per Vishay documentation for bi-directional types. | Select SMAJ8.5CA-E3/5A if sourcing from distributors listing CA as primary designation; electrically identical to SMAJ8.5C-E3/5A. |
| SMBJ8.5C-E3/52 | Higher 600 W PPPM, larger DO-214AA (SMB) package (0.236" × 0.157"), 16.5 V VC at 36.7 A IPPM. | Better suited for higher-energy threats (e.g., ISO 16750-2 load dump), but requires PCB layout change due to larger footprint. | Choose SMBJ8.5C-E3/52 only when surge energy exceeds 400 W capability and board space allows SMB package. |
Compared with SMAJ8.5C-E3/5A, SMAJ8.5CA-E3/5A offers identical protection performance in the same footprint, while SMBJ8.5C-E3/52 trades compactness for higher surge capacity - making SMAJ8.5C-E3/5A optimal for space-constrained 400 W-class protection where bi-directional symmetry is required.
Availability
SMAJ8.5C-E3/5A is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, USB peripheral protection circuits, and RS-485 communication interfaces requiring stable component supply across production lifecycles.
Supply support for SMAJ8.5C-E3/5A 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 AEC-Q101 qualification.
The SMAJ series targets cost-sensitive, high-volume transient suppression in automotive, industrial, and telecom applications - engineered for robust surge handling in compact surface-mount packages without sacrificing clamping precision.
FAQ
What is the key difference between SMAJ8.5C-E3/5A and SMAJ8.5A-E3/5A?
SMAJ8.5C-E3/5A is a bi-directional TVS diode with symmetrical clamping in both polarities, while SMAJ8.5A-E3/5A is uni-directional and features a cathode band marking. Their VWM is identical (8.5 V), but SMAJ8.5A-E3/5A has lower VC (14.4 V vs. 15.9 V) and slightly higher IPPM (27.8 A vs. 25.2 A) due to asymmetric junction design. SMAJ8.5C-E3/5A must be used where AC or floating signals require bidirectional protection - SMAJ8.5C-E3/5A cannot replace SMAJ8.5A-E3/5A in DC-biased circuits without verifying polarity tolerance.
Does SMAJ8.5C-E3/5A meet AEC-Q101 qualification?
No - SMAJ8.5C-E3/5A carries the E3 suffix, indicating RoHS-compliant commercial grade per JESD201 Class 1A whisker testing. For AEC-Q101 qualified versions, Vishay specifies the HE3 suffix (e.g., SMAJ8.5CHE3/5A). SMAJ8.5C-E3/5A is rated for –55 °C to +150 °C operation and MSL Level 1, but lacks the extended reliability validation required for automotive powertrain or safety-critical modules.
What is the junction capacitance of SMAJ8.5C-E3/5A at 0 V and 1 MHz?
The datasheet does not specify junction capacitance (CJ) for SMAJ8.5C-E3/5A individually, but Figure 4 shows typical CJ curves for the SMAJ family: at VWM = 8.5 V and f = 1.0 MHz, bi-directional variants exhibit approximately 200–250 pF. This value is derived from the plotted trend line for VWM ≤ 10 V, consistent with SMAJ8.5C-E3/5A's position in the family. Higher capacitance reflects its optimized clamping performance rather than high-speed signal integrity focus.
Can SMAJ8.5C-E3/5A be used in parallel to increase surge current handling?
No - SMAJ8.5C-E3/5A should not be paralleled without external balancing components. Minor VBR tolerances (9.44–11.5 V) cause uneven current sharing during transients, risking thermal runaway in the lower-breakdown unit. Vishay does not recommend paralleling SMAJ devices. For higher IPPM, select a single higher-rated part like SMBJ8.5C-E3/52 or SMCJ8.5C-E3/57 instead of stacking SMAJ8.5C-E3/5A units.
What is the maximum printed circuit board copper pad size recommended for SMAJ8.5C-E3/5A to achieve rated 400 W PPPM?
To achieve the full 400 W peak pulse power rating, SMAJ8.5C-E3/5A must be mounted on 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal, as specified in Note (2) of the Maximum Ratings table. Smaller pads reduce thermal dissipation, derating PPPM per Figure 2 - e.g., at 75 °C initial junction temperature, pulse power drops to ~75 % of rated value. The DO-214AC package's RθJA = 120 °C/W assumes this minimum pad layout.
SMAJ8.5C-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 25.2A
- 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)
SMAJ8.5C-E3/5A FAQ
1.How can I place an order for SMAJ8.5C-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5C-E3/5A 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 SMAJ8.5C-E3/5A reliable?
The price and inventory of SMAJ8.5C-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5C-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ8.5C-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5C-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5C-E3/5A?
SMAJ8.5C-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5C-E3/5A 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 SMAJ8.5C-E3/5A?
For technical support, including SMAJ8.5C-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5C-E3/5A requirements.
6.How does Aetrix verify that SMAJ8.5C-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5C-E3/5A 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 SMAJ8.5C-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ8.5C-E3/5A?
All SMAJ8.5C-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5C-E3/5A, 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 SMAJ8.5C-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ8.5C-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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