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Vishay General Semiconductor - Diodes Division SMAJ6.5A-E3/61
- Part No.:
- SMAJ6.5A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ6.5A-E3/61.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,365
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Product details
Overview
SMAJ6.5A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 6.5 V stand-off voltage (VWM), 7.22–7.98 V breakdown voltage at 10 mA, 11.2 V maximum clamping voltage at 35.7 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 power supplies.
For engineers reviewing the SMAJ6.5A-E3/61 datasheet, SMAJ6.5A-E3/61 pinout, SMAJ6.5A-E3/61 application, or SMAJ6.5A-E3/61 equivalent, key selection criteria include unidirectional polarity, 11.2 V clamping performance at 35.7 A, 500 A maximum reverse leakage at 6.5 V, 150 °C max junction temperature, and RoHS-compliant matte tin-plated leads suitable for automated SMT assembly.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (< 500 μA leakage at VWM), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold (7.22–7.98 V). Its glass-passivated junction ensures stable avalanche characteristics and repeatable clamping behavior across surge events.
Designed for surface-mount PCB integration, SMAJ6.5A-E3/61 uses a single-anode/cathode two-terminal configuration with cathode band marking. Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), requiring minimum 5.0 mm × 5.0 mm copper pads per terminal to sustain full 400 W pulse rating per JEDEC test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 6.5 V - maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 7.22 V / 7.98 V at 10 mA - guaranteed avalanche onset range defining turn-on consistency |
| VC @ IPPM | 11.2 V at 35.7 A - clamped voltage during 10/1000 μs surge, limiting downstream stress |
| PPPM | 400 W - peak transient energy absorption capability under standard waveform |
| ID @ VWM | 500 μA - reverse leakage current at rated stand-off, critical for low-power sensor line integrity |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - industry-standard 2-pin SMD outline with 5.28 mm length, 4.50 mm width, 2.29 mm height |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to protected circuit ground or low-side reference; completes clamping loop during overvoltage |
| Cathode | Avalanche conduction node / high-side connection | Marked with band; connects to line being protected (e.g., 5 V rail, CAN_H, sensor VDD); conducts surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 5–12 V DC rails without derating |
| Glass passivated chip junction | Ensures stable breakdown voltage tolerance and long-term reliability under repeated surge stress |
| MSL Level 1 (260 °C peak reflow) | Supports lead-free soldering without popcorn effect or delamination in high-volume SMT lines |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., inductive switch-off) |
| RoHS-compliant, commercial grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU and JESD201 Class 2 whisker resistance for industrial deployment |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping transients before they reach LDOs and microcontrollers. Use Value: Limits voltage to ≤11.2 V during 35.7 A surge, preventing latch-up or gate oxide damage in downstream 5 V logic. | Use Scenario: Analog sensor outputs (e.g., pressure, temperature) routed through long cables in factory automation cabinets. IC Role / Device Role / Timing Role: TVS mounted at connector entry point, shunting ESD (IEC 61000-4-2 ±8 kV contact) and cable-coupled noise. Use Value: Sub-μs response time and 500 μA leakage preserve signal fidelity while blocking >1 kV transients from ADC input stages. |
| Consumer USB Power Input Protection | Telecom DC Feeder Line Protection |
Use Scenario: 5 V USB-C PD input stage in smart home hubs subjected to hot-plug surges and nearby lightning-induced coupling. IC Role / Device Role / Timing Role: Primary front-end clamp on VBUS line, coordinated with polyfuse and secondary filtering. Use Value: 6.5 V VWM allows clean 5 V operation; 11.2 V VC prevents overvoltage on USB controller's internal LDO and PHY. | Use Scenario: -48 V DC feeder lines powering remote radio units in 4G/5G base stations, vulnerable to induced surges from tower lightning strikes. IC Role / Device Role / Timing Role: Unidirectional TVS installed at power entry module, referenced to system ground with series impedance. Use Value: Withstands repetitive 400 W pulses and maintains <1 μA leakage at -48 V reverse bias due to optimized doping profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ6.5A-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and package | No functional difference; selected where halogen-free compliance is mandated (e.g., EU public infrastructure tenders) | Choose SMAJ6.5A-M3/61 when halogen-free material declaration is required; otherwise SMAJ6.5A-E3/61 suffices. |
| P6SMB6.5A | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; RθJA = 90 °C/W vs. 120 °C/W | Better thermal dissipation allows higher duty-cycle surge handling; requires larger PCB footprint | Select P6SMB6.5A only if board layout permits 20 % larger pad area and thermal margin is critical. |
Compared with SMAJ6.5A-M3/61, SMAJ6.5A-E3/61 offers identical protection performance with standard RoHS compliance; versus P6SMB6.5A, it trades thermal headroom for space-constrained designs where 5.28 mm × 4.50 mm footprint is mandatory.
Availability
SMAJ6.5A-E3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB power inputs, and telecom DC feeder lines requiring stable component supply with full traceability and no obsolescence risk.
Supply support for SMAJ6.5A-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 high-volume manufacturability.
The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for fast, repeatable clamping in harsh electromagnetic environments - targeting automotive, industrial, and communications systems where surge immunity must meet ISO 16750, IEC 61000-4-5, and AEC-Q101 requirements.
FAQ
What is the maximum clamping voltage of the SMAJ6.5A-E3/61 under a 10/1000 μs surge?
The SMAJ6.5A-E3/61 has a maximum clamping voltage (VC) of 11.2 V when subjected to its rated peak pulse current of 35.7 A using the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring compatibility with 5 V or 3.3 V logic thresholds downstream of the SMAJ6.5A-E3/61.
Is the SMAJ6.5A-E3/61 suitable for automotive applications?
Yes, the SMAJ6.5A-E3/61 is qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes; however, the E3/61 variant is commercial-grade and not AEC-Q101 certified. For non-safety-critical automotive subsystems (e.g., infotainment power rails, body control modules outside engine bay), SMAJ6.5A-E3/61 meets ISO 7637-2 Pulse 1/2/3a requirements due to its 150 °C TJ max and robust 400 W surge rating - but design-in for ASIL-B/C systems requires the AEC-Q101-qualified SMAJ6.5AHE3_A/H variant.
How does the SMAJ6.5A-E3/61 differ from bidirectional TVS diodes like SMAJ6.5CA?
The SMAJ6.5A-E3/61 is unidirectional and functions only in reverse-bias avalanche mode, with polarity marked by a cathode band; SMAJ6.5CA is bidirectional and symmetrical, suppressing transients in both directions without polarity sensitivity. SMAJ6.5A-E3/61 is used on DC lines where ground-referenced clamping is sufficient (e.g., 5 V supply), whereas SMAJ6.5CA suits AC-coupled or floating signal paths (e.g., RS-485, CAN bus). Their VBR and VC values differ slightly due to structural asymmetry.
What is the thermal resistance and recommended PCB layout for optimal performance of the SMAJ6.5A-E3/61?
The SMAJ6.5A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. To achieve full 400 W pulse rating, Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - minimum 2 oz. copper with thermal vias recommended for sustained surge duty. Without this layout, derating per Figure 2 applies, reducing usable PPPM significantly.
Does the SMAJ6.5A-E3/61 have a specified junction capacitance for high-speed signal line protection?
No, junction capacitance is not specified for the SMAJ6.5A-E3/61 in the official Vishay datasheet (document 88390). The family's capacitance curves (Figure 4) begin at VWM ≥ 10 V; below that, data is omitted. For high-speed data lines (e.g., USB 2.0, HDMI), lower-capacitance TVS devices such as the SMF6.5A (CJ ≈ 200 pF) or specialized ESD arrays are preferred - SMAJ6.5A-E3/61 is optimized for power rail and medium-speed analog protection, not GHz-frequency signal integrity.
SMAJ6.5A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 6.5V
- Voltage - Breakdown (Min):
- 7.22V
- Voltage - Clamping (Max) @ Ipp:
- 11.2V
- Current - Peak Pulse (10/1000µs):
- 35.7A
- 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)
SMAJ6.5A-E3/61 FAQ
1.How can I place an order for SMAJ6.5A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ6.5A-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 SMAJ6.5A-E3/61 reliable?
The price and inventory of SMAJ6.5A-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 SMAJ6.5A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ6.5A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ6.5A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ6.5A-E3/61?
SMAJ6.5A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ6.5A-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 SMAJ6.5A-E3/61?
For technical support, including SMAJ6.5A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ6.5A-E3/61 requirements.
6.How does Aetrix verify that SMAJ6.5A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ6.5A-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 SMAJ6.5A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ6.5A-E3/61?
All SMAJ6.5A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ6.5A-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 SMAJ6.5A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ6.5A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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