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Vishay General Semiconductor - Diodes Division SMAJ30AHE3/61
- Part No.:
- SMAJ30AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30AHE3/61.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,899
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Product details
Overview
SMAJ30AHE3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 30 V stand-off voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA, 48.4 V maximum clamping voltage (VC) at 8.3 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ30AHE3/61 datasheet, SMAJ30AHE3/61 pinout, SMAJ30AHE3/61 application, or SMAJ30AHE3/61 equivalent, key selection criteria include clamping performance under 8.3 A surge, unidirectional polarity marking, AEC-Q101 qualification status, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert transient energy away from downstream ICs. Its glass-passivated junction ensures stable leakage (<1.0 μA at 30 V) and fast response time (<1.0 ps), critical for suppressing ESD and inductive switching spikes.
The device is rated for 40 A non-repetitive forward surge current (IFSM), supports continuous power dissipation of 3.3 W at 50 °C ambient, and exhibits a thermal resistance of 120 °C/W (junction-to-ambient) - requiring careful PCB copper pad design per Vishay's recommended 0.2" × 0.2" layout for full 400 W pulse capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 33.3 V / 36.8 V at 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 48.4 V at 8.3 A - clamped voltage during 10/1000 μs transient; limits stress on protected 3.3 V or 5 V logic inputs. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; validated on 0.2" × 0.2" copper pads per JEDEC standards. |
| ID @ VWM | ≤1.0 μA - ultra-low reverse leakage at stand-off voltage; avoids parasitic loading on high-impedance sensor or reference circuits. |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by black band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., CAN_H, 24 V rail); conducts avalanche current to ground during overvoltage event. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes shunt conduction path during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power domains. |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V supply lines without degradation when mounted per spec. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure in industrial environments. |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns or pre-bake requirements. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during transients - critical for protecting 3.3 V microcontrollers and CAN transceivers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
|
Use Scenario: Protecting 24 V supply input of body control module against load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VBAT and chassis ground, responding within picoseconds to clamp spikes above 36.8 V. Use Value: Limits voltage seen by downstream DC/DC converters and MCU power pins to ≤48.4 V, preventing latch-up or oxide damage. |
Use Scenario: Safeguarding analog output (4–20 mA) loop of pressure sensor in factory automation PLC I/O module. IC Role / Device Role / Timing Role: Unidirectional TVS connected cathode-to-signal, anode-to-ground to absorb ESD and cable discharge events. Use Value: Maintains signal integrity with <1.0 μA leakage at 30 V, avoiding offset errors in precision current-loop measurement. |
| Telecom Interface Surge Suppression | Consumer Device USB Port Protection |
|
Use Scenario: Front-end protection of RS-485 transceiver in networked building management system controller. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMAJ30AHE3/61 applied on VCC rail to guard against induced lightning surges on long bus cables. Use Value: Withstands repetitive 400 W pulses at 0.01% duty cycle, enabling reliable operation in outdoor telecom cabinets. |
Use Scenario: Overvoltage guard on VBUS line of USB-C port in smart home hub exposed to hot-plug and adapter fault conditions. IC Role / Device Role / Timing Role: Clamps 12 V adapter overvoltage transients before they reach USB PD controller and Type-C multiplexer. Use Value: 48.4 V clamping ensures protected ICs rated for 5.5 V absolute maximum are never subjected to >5 V beyond tolerance margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30A-E3/61 | Commercial-grade version; lacks AEC-Q101 qualification and automotive traceability documentation. | Approved for industrial and consumer use only; not permitted in automotive OEM BOMs requiring PPAP. | Select when cost sensitivity outweighs automotive qualification requirements and full lifecycle support is not mandated. |
| SMAJ33AHE3/61 | Higher VWM (33 V) and VBR (36.7–40.6 V); same package, power rating, and AEC-Q101 status. | Better suited for 28 V nominal systems (e.g., avionics power buses) where 30 V VWM risks false triggering. | Choose for higher-voltage rails where tighter margin between nominal and clamping voltage is required. |
Compared with SMAJ30A-E3/61, SMAJ30AHE3/61 adds automotive qualification and enhanced process controls; versus SMAJ33AHE3/61, it offers lower clamping voltage (48.4 V vs. 53.3 V) for better protection of 3.3 V logic, at the expense of slightly reduced noise immunity on 24 V lines.
Availability
SMAJ30AHE3/61 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom infrastructure equipment requiring stable component supply with full AEC-Q101 compliance and traceable sourcing.
Supply support for SMAJ30AHE3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and inductive switching is mission-critical.
FAQ
What is the clamping voltage of SMAJ30AHE3/61 at its rated peak pulse current?
The SMAJ30AHE3/61 has a maximum clamping voltage (VC) of 48.4 V when subjected to its specified peak pulse current of 8.3 A with a 10/1000 μs waveform. This value is measured under standardized test conditions per JEDEC and is critical for ensuring downstream ICs remain within their absolute maximum voltage ratings during transient events. The clamping performance is guaranteed across the full operating temperature range and forms the basis for system-level surge protection design using SMAJ30AHE3/61.
Is SMAJ30AHE3/61 suitable for bidirectional signal line protection?
No, SMAJ30AHE3/61 is a unidirectional TVS diode, intended for protection of DC power rails or single-polarity signal paths. Its cathode band indicates polarity, and it does not conduct in forward bias beyond typical diode drop. For bidirectional applications such as AC-coupled data lines or RS-485, a bidirectional variant like SMAJ30CAHE3/61 must be used instead. Using SMAJ30AHE3/61 on bidirectional signals risks forward conduction and improper clamping behavior.
Does SMAJ30AHE3/61 require derating above 25 °C ambient temperature?
Yes, SMAJ30AHE3/61 requires thermal derating above 25 °C ambient. Its peak pulse power rating drops linearly with increasing junction temperature, following the curve in Figure 2 of Vishay document 88390. At 75 °C ambient, the 400 W rating is reduced to approximately 280 W; at 100 °C, it falls to ~180 W. Designers must apply appropriate copper pad area and airflow considerations - or select a higher-power variant - to maintain required surge immunity in elevated-temperature environments.
What is the meaning of the "HE3" suffix in SMAJ30AHE3/61?
Within Vishay's ordering nomenclature, the "HE3" suffix in SMAJ30AHE3/61 denotes RoHS-compliant construction with AEC-Q101 qualification. "H" indicates automotive grade, "E3" confirms lead-free matte tin plating and compliance with EU RoHS Directive 2011/65/EU. This distinguishes SMAJ30AHE3/61 from commercial versions (e.g., SMAJ30A-E3/61) and ensures full traceability, extended temperature validation, and failure mode documentation required for automotive production.
Can SMAJ30AHE3/61 be used in parallel to increase surge current handling?
No, SMAJ30AHE3/61 should not be paralleled to increase surge current capacity. Due to manufacturing tolerances in breakdown voltage (±5% VBR spread), current sharing between devices is inherently unbalanced - one unit will avalanche first and absorb most of the transient energy, risking thermal runaway and failure. For higher current requirements, select a single higher-rated device (e.g., SMBJ30AHE3/61) or implement external current-balancing resistors, though the latter degrades clamping performance and is not recommended per Vishay guidelines.
SMAJ30AHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ30AHE3/61 FAQ
1.How can I place an order for SMAJ30AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30AHE3/61 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 SMAJ30AHE3/61 reliable?
The price and inventory of SMAJ30AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ30AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30AHE3/61?
SMAJ30AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30AHE3/61 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 SMAJ30AHE3/61?
For technical support, including SMAJ30AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30AHE3/61 requirements.
6.How does Aetrix verify that SMAJ30AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ30AHE3/61 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 SMAJ30AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ30AHE3/61?
All SMAJ30AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30AHE3/61, 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 SMAJ30AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ30AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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