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Vishay General Semiconductor - Diodes Division SMAJ30-E3/61
- Part No.:
- SMAJ30-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30-E3/61.pdf
- Description:
- TVS DIODE 30VWM 53.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ30-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping voltage transients on power and signal lines. It features a 30 V stand-off voltage (VWM), 53.5 V maximum clamping voltage (VC) at 7.5 A peak pulse current (IPPM), and 400 W peak pulse power dissipation (10/1000 µs waveform), making it suitable for protecting MOSFETs and ICs in industrial power supplies.
For engineers reviewing the SMAJ30-E3/61 datasheet, SMAJ30-E3/61 pinout, SMAJ30-E3/61 application, or SMAJ30-E3/61 equivalent, key selection criteria include its unidirectional polarity, 1.0 µA max reverse leakage at VWM, 33.3–40.7 V breakdown voltage range, 150 °C max junction temperature, and RoHS-compliant matte tin-plated leads solderable per J-STD-002.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable performance under repetitive surge conditions, and its low incremental surge resistance enables rapid energy diversion away from sensitive downstream components.
The SMAJ30-E3/61 is rated for 40 A peak forward surge current (8.3 ms half-sine, unidirectional only), exhibits 120 °C/W typical junction-to-ambient thermal resistance, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak tolerance - confirming suitability for automated SMT assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin below breakdown. |
| VBR (min/max) | 33.3 V / 40.7 V - Breakdown occurs within this range at 1.0 mA test current; ensures consistent turn-on across production lots. |
| VC @ IPPM | 53.5 V - Clamped voltage seen by protected circuit during 7.5 A 10/1000 µs surge; determines maximum stress on downstream devices. |
| IPPM | 7.5 A - Peak surge current capability under standard 10/1000 µs waveform; directly relates to energy absorption (400 W). |
| ID @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; low value minimizes standby power loss and avoids false triggering. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports reliable operation in high-ambient industrial environments. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking; compatible with 7" tape-and-reel (E3/61). |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with two coplanar gull-wing leads; cathode indicated by a single band on one end. Mounting requires 0.2 × 0.2 inch (5.0 × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected line's lower-potential side (e.g., ground return path). | Enables unidirectional clamping from cathode to anode during positive transients; must be routed with low-inductance trace to minimize overshoot. |
| Cathode | Current exit point in forward bias; marked by band; connected to protected line's higher-potential side (e.g., VIN or signal rail). | Defines clamping polarity: conducts when cathode voltage exceeds anode by ≥VBR; placement determines which voltage rail is safeguarded. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Supports robust protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 24 V DC rails without derating. |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure in industrial deployments. |
| MSL Level 1 (260 °C peak) | Eliminates pre-bake requirement for PCB assembly, reducing manufacturing cost and cycle time in high-volume SMT lines. |
| RoHS-compliant matte tin plating | Guarantees solderability per J-STD-002 and eliminates whisker growth risk (JESD 201 Class 1A) in automotive-grade applications. |
| Low profile DO-214AC footprint | Enables compact layout on space-constrained boards while maintaining thermal pad area for effective heat spreading. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) Signal Lines |
|---|---|
|
Use Scenario: Suppresses load-dump and jump-start transients on 24 V DC input rails of programmable logic controllers (PLCs) and motor drives. IC Role / Device Role: Unidirectional TVS placed between input rail and chassis ground to clamp positive-going spikes above 30 V. Use Value: Limits voltage seen by upstream EMI filter capacitors and downstream DC-DC controllers to ≤53.5 V, preventing overvoltage failure. |
Use Scenario: Protects LIN bus and sensor analog inputs (e.g., temperature, pressure) in BCMs from ISO 7637-2 Pulse 1/2a-induced transients. IC Role / Device Role: Clamps negative transients on signal lines referenced to battery ground using cathode-to-rail configuration. Use Value: Maintains signal integrity below 53.5 V clamping level while drawing <1 µA leakage at 30 V, avoiding sensor offset errors. |
| Telecom AC-DC Adapter Secondary Side | Consumer Appliance Motor Driver Gate Protection |
|
Use Scenario: Guards secondary-side 12 V/5 V outputs of wall adapters against fast-rising transients from relay switching or cable ESD events. IC Role / Device Role: Placed across output terminals to shunt surge energy before reaching USB ports or microcontroller I/O pins. Use Value: Responds in <1 ns to limit transient duration, reducing risk of latch-up in connected SoCs without adding series impedance. |
Use Scenario: Shields gate oxide of N-channel MOSFETs in washing machine motor inverters from Miller-induced voltage spikes during commutation. IC Role / Device Role: Connected between gate and source to clamp gate-source voltage to safe levels (<±20 V) during switching transitions. Use Value: Prevents gate oxide breakdown with 53.5 V clamping ceiling and 7.5 A surge capacity, extending MOSFET lifetime under repeated stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-E3/61 | Lower VBR range (33.3–36.8 V) and tighter tolerance; clamps at 48.4 V @ 8.3 A. | Better suited for 28–30 V nominal systems where tighter VWM/VC margin is critical. | Select SMAJ30A-E3/61 when design requires reduced clamping voltage and accepts slightly lower surge current rating. |
| SMBJ30-E3/52 | Same VWM/VC specs but in larger DO-214AA (SMB) package; 600 W peak power rating. | Higher power handling supports longer-duration transients; requires larger PCB footprint. | Choose SMBJ30-E3/52 when system-level surge testing exceeds 400 W or thermal management allows larger package. |
Compared with SMAJ30-E3/61, the SMAJ30A-E3/61 offers lower clamping voltage at the cost of reduced surge margin, while the SMBJ30-E3/52 provides higher power headroom in a less space-efficient package - enabling trade-offs between board area, clamping precision, and energy absorption.
Availability
SMAJ30-E3/61 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom adapter outputs, and consumer appliance motor drivers requiring stable component supply with full traceability and lifecycle support.
Supply support for SMAJ30-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 manufacturability.
The SMAJ series was developed specifically for surface-mount transient suppression in high-volume industrial and automotive applications, balancing compact size, robust surge capability, and process compatibility with automated assembly.
FAQ
What is the polarity configuration of SMAJ30-E3/61?
SMAJ30-E3/61 is a unidirectional TVS diode, with the banded end indicating the cathode terminal. It conducts only when the cathode voltage exceeds the anode voltage by its breakdown voltage (33.3–40.7 V), making it suitable for clamping positive transients on grounded-return circuits. This polarity must be observed during PCB layout to ensure correct protection directionality in the SMAJ30-E3/61 implementation.
Does SMAJ30-E3/61 meet automotive qualification standards?
SMAJ30-E3/61 is commercial-grade RoHS-compliant (E3 suffix) and meets JESD201 Class 1A whisker resistance, but it is not AEC-Q101 qualified. For automotive applications requiring formal qualification, the HE3-suffix variant (e.g., SMAJ30HE3/61) is specified and tested to AEC-Q101. Engineers must select SMAJ30-E3/61 only for non-safety-critical or non-automotive-tier deployments unless validated per system-level requirements.
What is the maximum clamping voltage of SMAJ30-E3/61 under surge conditions?
The maximum clamping voltage of SMAJ30-E3/61 is 53.5 V, measured at 7.5 A peak pulse current with a 10/1000 µs waveform. This value represents the highest voltage imposed on the protected circuit during standardized surge events and is critical for ensuring downstream components (e.g., 3.3 V or 5 V ICs) remain within absolute maximum ratings when SMAJ30-E3/61 activates.
Can SMAJ30-E3/61 be used in bidirectional protection applications?
No - SMAJ30-E3/61 is strictly unidirectional and lacks symmetrical breakdown characteristics. For bidirectional transient suppression, Vishay specifies CA-suffix variants (e.g., SMAJ30CA-E3/61), which exhibit matched clamping in both polarities. Using SMAJ30-E3/61 in reverse-biased configurations risks permanent damage due to lack of reverse avalanche capability, so correct device selection is essential for SMAJ30-E3/61 deployment.
What is the thermal resistance specification for SMAJ30-E3/61?
SMAJ30-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2 × 0.2 inch copper pads per lead, and a junction-to-lead resistance (RθJL) of 30 °C/W. These values define temperature rise under steady-state power dissipation and guide thermal pad design - underscoring that sustained surge duty cycles require careful thermal management to maintain SMAJ30-E3/61 junction temperature below 150 °C.
SMAJ30-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- 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)
SMAJ30-E3/61 FAQ
1.How can I place an order for SMAJ30-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30-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 SMAJ30-E3/61 reliable?
The price and inventory of SMAJ30-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 SMAJ30-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ30-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30-E3/61?
SMAJ30-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30-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 SMAJ30-E3/61?
For technical support, including SMAJ30-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30-E3/61 requirements.
6.How does Aetrix verify that SMAJ30-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ30-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 SMAJ30-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ30-E3/61?
All SMAJ30-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30-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 SMAJ30-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ30-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30-E3/61 Tags
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