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Vishay General Semiconductor - Diodes Division SMAJ30AHE3_A/I
- Part No.:
- SMAJ30AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30AHE3_A/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,134
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Product details
Overview
SMAJ30AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 30 V stand-off voltage (VWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA test current, 48.4 V maximum clamping voltage (VC) at 8.3 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ30AHE3_A/I datasheet, SMAJ30AHE3_A/I pinout, SMAJ30AHE3_A/I application, or SMAJ30AHE3_A/I equivalent, this device serves as a robust, AEC-Q101-qualified transient protection solution for automotive power line and signal line interfaces where fast response (<1 ns), low clamping ratio, and stable thermal performance up to +150 °C junction temperature are required.
Technical Context
The SMAJ30AHE3_A/I operates as a unidirectional avalanche diode, leveraging glass-passivated silicon junction technology to deliver sub-nanosecond response to ESD and surge events. Its clamping behavior is defined by a well-controlled dynamic impedance (low incremental surge resistance) and exhibits a temperature coefficient of VBR at +0.099 %/°C - enabling predictable voltage margining across automotive temperature ranges.
Designed for surface-mount assembly on PCBs with minimum 0.2" × 0.2" copper pads per terminal, it supports automated placement and meets J-STD-020 MSL Level 1 (peak reflow ≤ 260 °C). The cathode band marking identifies polarity, and its unidirectional configuration ensures forward conduction only during reverse overvoltage conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on during transients without premature conduction. |
| VC (Clamping Voltage) | 48.4 V at 8.3 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs surge; enables I/O or power rail protection with <1.6× VWM ratio. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability under standard 10/1000 μs waveform; rated for 0.01% duty cycle repetitive surges. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard pad layout; informs derating above 25 °C ambient for sustained reliability. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive environments and industrial enclosures. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC specification; suitable for ASIL-B supporting systems. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); cathode identified by band marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return plane; carries full surge current during clamping event. |
| Cathode | Protected line connection / Surge sink | Connected to line being protected (e.g., 24 V supply rail or CAN_H); clamps to anode when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against ISO 7637-2 Pulse 1, 2a, and 5a transients in 12 V/24 V automotive systems without external series impedance. |
| AEC-Q101 qualification (HE3 suffix) | Confirms long-term reliability under automotive thermal cycling, humidity, and vibration stress - required for Tier-1 ECU and body control module designs. |
| Low clamping ratio (VC/VWM ≈ 1.61) | Minimizes overvoltage stress on downstream ICs such as microcontrollers, CAN transceivers, or sensor signal conditioners during surge events. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT production planning and reduces handling overhead. |
| Glass-passivated junction | Ensures stable leakage current (<1.0 μA at VWM) and consistent VBR over time and temperature - critical for low-power always-on circuits. |
Applications
| Automotive Power Line Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed ECUs from load dump and alternator ripple-induced surges in commercial vehicle applications. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor; clamps transients within nanoseconds before they reach DC-DC converters or LDOs. Use Value: Maintains system uptime by preventing latch-up or permanent damage to power management ICs during 120 V/50 ms load dump events per ISO 16750-2. |
Use Scenario: Safeguarding high-speed CAN FD physical layer transceivers (e.g., TJA1044) against ESD and coupled noise on vehicle wiring harnesses. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; SMAJ30AHE3_A/I used on single-ended supply lines (VCC_IO) feeding transceivers - not on differential bus lines. Use Value: Prevents false dominant states and communication errors by limiting supply rail excursions to ≤48.4 V during ±30 kV contact ESD (IEC 61000-4-2). |
| Industrial Sensor Signal Conditioning | Consumer Appliance Motor Drive Inputs |
|
Use Scenario: Shielding analog front-end amplifiers and ADC inputs in pressure/temperature sensors exposed to relay-switched 24 V solenoid loads. IC Role / Device Role / Timing Role: Placed at sensor module input connector; shunts inductive kickback from nearby relays before reaching op-amp input stages. Use Value: Preserves measurement accuracy by limiting transient-induced offset shift and avoiding amplifier saturation or input stage damage. |
Use Scenario: Protecting microcontroller GPIOs and gate drivers in washing machine motor control boards subjected to brush-commutator noise and mains coupling. IC Role / Device Role / Timing Role: Mounted across motor driver enable lines or VDD rails; absorbs repetitive 100–500 V spikes generated during commutation. Use Value: Extends product lifetime by eliminating latent failures caused by cumulative dielectric stress in MCU I/O protection structures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30AHM3_A/I | Halogen-free, RoHS-compliant, AEC-Q101 qualified - identical electrical specs but different material composition. | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy (e.g., VW TL 52365). | Choose SMAJ30AHM3_A/I if halogen-free certification is contractually required; otherwise SMAJ30AHE3_A/I offers same protection performance at standard cost. |
| SMAJ33AHE3_A/I | Higher VWM (33 V), VBR (36.7–40.6 V), and VC (53.3 V); 300 W PPPM (derated above 78 V threshold, not applicable here). | Better margin for 33 V nominal systems; less effective clamping for 30 V rails due to higher VC - may fail to protect 3.3 V logic powered from same rail. | Select SMAJ33AHE3_A/I only when protecting circuits referenced to ≥33 V supplies; for 30 V systems, SMAJ30AHE3_A/I provides tighter clamping and superior protection headroom. |
Compared with SMAJ30AHM3_A/I, SMAJ30AHE3_A/I offers identical surge performance with standard RoHS compliance; compared with SMAJ33AHE3_A/I, SMAJ30AHE3_A/I delivers lower clamping voltage (48.4 V vs. 53.3 V) and better fit for 30 V nominal rails - making it the optimal choice for precise voltage-margining in automotive and industrial 24–30 V applications.
Availability
SMAJ30AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor modules, and consumer appliance motor drive systems requiring stable component supply with AEC-Q101 validation and long-term lifecycle support.
Supply support for SMAJ30AHE3_A/I 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where robustness, fast response, and qualification compliance are non-negotiable.
FAQ
What is the clamping voltage of SMAJ30AHE3_A/I at its rated peak pulse current?
The SMAJ30AHE3_A/I has a maximum clamping voltage (VC) of 48.4 V at 8.3 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value defines the upper voltage limit imposed on the protected circuit during surge events and is confirmed in Vishay's official datasheet revision 09-Jan-2024 (Document Number: 88390). The low VC/VWM ratio of ~1.61 makes SMAJ30AHE3_A/I especially effective for safeguarding 3.3 V or 5 V logic powered from 24–30 V rails.
Is SMAJ30AHE3_A/I suitable for automotive applications?
Yes, SMAJ30AHE3_A/I is AEC-Q101 qualified - explicitly validated for automotive use per the HE3 suffix designation. It undergoes rigorous stress testing including high-temperature operating life (HTOL), temperature cycling, and unbiased highly accelerated stress testing (UHAST), ensuring reliability in engine bay and chassis-mounted ECUs. Its +150 °C TJ max. and MSL Level 1 rating further confirm suitability for automotive manufacturing and deployment environments.
How does the SMAJ30AHE3_A/I differ from bidirectional TVS diodes like SMAJ30CA?
SMAJ30AHE3_A/I is unidirectional and functions only during reverse-biased overvoltage conditions - ideal for DC power rail protection where polarity is fixed. In contrast, SMAJ30CA is bidirectional and clamps in both polarities, suited for AC lines or differential buses like RS-485. SMAJ30AHE3_A/I exhibits forward voltage drop (~3.5 V at 25 A) and cathode band marking; SMAJ30CA has no polarity marking and symmetrical VBR in both directions. Using SMAJ30AHE3_A/I on AC signals would cause unintended conduction.
What is the thermal resistance and how does it affect layout for SMAJ30AHE3_A/I?
SMAJ30AHE3_A/I 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 PCB copper; increasing pad area or adding internal ground planes lowers RθJA and improves surge endurance. For repeated surge events, thermal derating per Figure 2 in the datasheet must be applied - e.g., at 85 °C ambient, PPPM drops to ~280 W. Proper layout directly impacts long-term reliability of SMAJ30AHE3_A/I in high-duty-cycle applications.
Can SMAJ30AHE3_A/I replace SMAJ24AHE3_A/I in a 24 V system?
No - SMAJ30AHE3_A/I is not a direct replacement for SMAJ24AHE3_A/I in a 24 V system. While both share the same package and AEC-Q101 qualification, SMAJ30AHE3_A/I has a 30 V stand-off voltage (VWM), leaving only 0.5–1 V margin above nominal 24 V, risking nuisance clamping during normal ripple or cold-crank dips. SMAJ24AHE3_A/I (VWM = 24 V) provides appropriate 3–4 V margin. Substituting SMAJ30AHE3_A/I risks premature conduction, increased leakage, and reduced system efficiency - always match VWM to the nominal rail voltage.
SMAJ30AHE3_A/I 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:
- -
- 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_A/I FAQ
1.How can I place an order for SMAJ30AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30AHE3_A/I 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_A/I reliable?
The price and inventory of SMAJ30AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ30AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ30AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30AHE3_A/I?
SMAJ30AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30AHE3_A/I 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_A/I?
For technical support, including SMAJ30AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ30AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ30AHE3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ30AHE3_A/I?
All SMAJ30AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30AHE3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for SMAJ30AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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