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Vishay General Semiconductor - Diodes Division SMAJ30A-E3/61
- Part No.:
- SMAJ30A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30A-E3/61.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:697,035
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Product details
Overview
SMAJ30A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 30 V standoff voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA, 48.4 V clamping voltage (VC) at 8.3 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), deployed on power rails and signal lines in automotive ECUs and industrial I/O modules.
For engineers reviewing the SMAJ30A-E3/61 datasheet, SMAJ30A-E3/61 pinout, SMAJ30A-E3/61 application, or SMAJ30A-E3/61 equivalent, key selection criteria include unidirectional polarity, SMA (DO-214AC) package compatibility, 150 °C max junction temperature, low incremental surge resistance, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, diverting transient energy to ground while limiting downstream voltage to ≤48.4 V. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at 30 V) and fast response time (<1.0 ps), critical for protecting MOSFET gates and microcontroller I/O pins against ESD and inductive switching spikes.
The device is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), supports automated SMT placement, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Thermal resistance is 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads - enabling reliable operation without heatsinking in space-constrained PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR (min/max) | 33.3 V / 36.8 V at 1 mA - Confirmed breakdown range ensures predictable turn-on across process variation and temperature. |
| VC @ IPPM | 48.4 V at 8.3 A - Clamped voltage during 10/1000 μs transient; determines maximum stress on protected IC inputs. |
| PPPM | 400 W - Peak pulse power handling capability; sufficient for ISO 7637-2 Pulse 1/2a/5a automotive transients. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms); validates robustness against motor-commutation spikes. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments. |
| RθJA | 120 °C/W - Thermal resistance on minimal pad layout; informs derating requirements above 25 °C ambient. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to protected line (e.g., 30 V supply rail); conducts during positive transients only in unidirectional mode. |
| Cathode | Avalanche conduction node / clamp reference | Connected to system ground; establishes clamping threshold relative to GND; marked with band. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Supports high-energy transients per ISO 7637-2 without degradation; validated up to 0.01% duty cycle. |
| Glass passivated chip junction | Ensures <1.0 μA reverse leakage at VWM, minimizing standby power loss in battery-powered systems. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without moisture-induced damage; no baking required pre-assembly. |
| Low profile SMA package | 0.208" × 0.157" footprint fits dense automotive PCBs; compatible with standard pick-and-place equipment. |
| AEC-Q101 qualification path | HE3 suffix variants are automotive-qualified; this E3/61 part shares identical die and construction. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 30 V supply inputs of engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 30 V rail and chassis ground. Use Value: Limits voltage excursion to ≤48.4 V during 100 V/100 ms load dump events, preventing damage to 40 V-rated DC-DC converters. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors from ESD and cable discharge. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode grounded) on signal line with series resistor. Use Value: Sub-1 ns response clamps ±8 kV contact ESD (IEC 61000-4-2) to safe levels before sensor amplifier input stages saturate. |
| Consumer USB Port Surge Suppression | Telecom Power Interface Protection |
Use Scenario: Safeguarding VBUS line in USB-C receptacles against hot-plug transients and external surge coupling. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-VBUS, cathode-to-ground, upstream of USB controller. Use Value: Withstands 30 A 8/20 μs surges (derated from 400 W rating) while maintaining <50 mΩ dynamic impedance during clamping. | Use Scenario: Protecting -48 V telecom power feeds in remote radio units from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional TVS configured cathode-to-ground, anode-to -48 V rail (reverse-biased for negative rail). Use Value: 30 V standoff allows safe operation on -48 V systems with 20 % ripple; clamps negative transients to ≥-48.4 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No functional difference; selected where halogen-free compliance is mandated (e.g., EU public infrastructure projects). | Choose M3/61 when halogen-free material declaration is contractually required; otherwise E3/61 is standard. |
| SMAJ33A-E3/61 | Higher 33 V standoff voltage; VBR = 36.7–40.6 V; VC = 53.3 V at 7.5 A. | Better suited for 33 V nominal systems; trades lower clamping ratio for higher VWM margin. | Select SMAJ33A-E3/61 if system nominal voltage is ≥33 V and clamping voltage tolerance permits >53 V. |
Compared with SMAJ30A-M3/61, the SMAJ30A-E3/61 offers identical protection performance with standard RoHS compliance; versus SMAJ33A-E3/61, it provides tighter clamping (48.4 V vs. 53.3 V) at the cost of reduced standoff margin - making it optimal for 30 V systems where voltage headroom is constrained.
Availability
SMAJ30A-E3/61 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power feed protection requiring stable component supply and full traceability.
Supply support for SMAJ30A-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 and automotive-grade qualification.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness against ISO 7637-2 and IEC 61000-4-5 threats is mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ30A-E3/61 under standard test conditions?
The SMAJ30A-E3/61 has a maximum clamping voltage (VC) of 48.4 V at 8.3 A peak pulse current (IPPM) using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ30A-E3/61 maintains this clamping performance across its specified operating temperature range.
Is the SMAJ30A-E3/61 suitable for automotive applications requiring AEC-Q101 qualification?
The SMAJ30A-E3/61 itself is commercial-grade, but Vishay offers the functionally identical SMAJ30AHE3_A/H variant which is AEC-Q101 qualified. Both share the same die, SMA (DO-214AC) package, and electrical characteristics. For automotive production, specify the HE3 suffix; the SMAJ30A-E3/61 serves as a drop-in evaluation or non-automotive alternative.
What is the thermal resistance and how does it affect PCB layout for the SMAJ30A-E3/61?
The SMAJ30A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal copper area; increasing pad size or adding thermal vias reduces RθJA and improves power handling. Layout must follow Vishay's recommended mounting pad dimensions to ensure rated 400 W pulse capability.
How does the SMAJ30A-E3/61 differ from bidirectional TVS diodes like SMAJ30CA?
The SMAJ30A-E3/61 is unidirectional and features polarity marking (cathode band); it conducts only during reverse overvoltage. In contrast, SMAJ30CA is bidirectional with symmetrical clamping in both directions and no polarity marking. Use SMAJ30A-E3/61 for DC rails where polarity is fixed; choose SMAJ30CA for AC lines or differential signals. Both share identical VWM, VBR, and VC magnitudes.
What packaging format is supplied for the SMAJ30A-E3/61 and what is the reel quantity?
The SMAJ30A-E3/61 is supplied in 7" diameter plastic tape and reel packaging with a base quantity of 1800 pieces per reel (package code /61). This format is optimized for high-speed SMT assembly and complies with EIA-481 standards. Tape pitch is 8 mm, and components are positioned with cathode band oriented per orientation specification in the datasheet.
SMAJ30A-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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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)
SMAJ30A-E3/61 FAQ
1.How can I place an order for SMAJ30A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30A-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 SMAJ30A-E3/61 reliable?
The price and inventory of SMAJ30A-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 SMAJ30A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ30A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30A-E3/61?
SMAJ30A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30A-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 SMAJ30A-E3/61?
For technical support, including SMAJ30A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30A-E3/61 requirements.
6.How does Aetrix verify that SMAJ30A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ30A-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 SMAJ30A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ30A-E3/61?
All SMAJ30A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30A-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 SMAJ30A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ30A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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