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Vishay General Semiconductor - Diodes Division SMAJ30CAHM3_A/I
- Part No.:
- SMAJ30CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30CAHM3_A/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ30CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage (VC) at 8.3 A peak pulse current (IPPM), 400 W peak pulse power (10/1000 μs), and operates across -55 °C to +150 °C junction temperature range - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ30CAHM3_A/I datasheet, SMAJ30CAHM3_A/I pinout, SMAJ30CAHM3_A/I application, or SMAJ30CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and compatibility with automated SMT assembly on standard PCB pad layouts per JEDEC DO-214AC footprint.
Technical Context
This device functions as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical reverse/forward conduction behavior due to its bidirectional construction. Its low incremental surge resistance (typical <0.5 Ω) and fast response time (<1.0 ps) enable effective suppression of ESD, lightning-induced surges, and inductive switching transients.
The SMAJ30CAHM3_A/I is rated for 400 W peak pulse power at 25 °C with derating above TA = 25 °C per Fig. 2, and supports repetitive surge duty cycles up to 0.01 % (100 Hz). Thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), requiring minimal copper pad area (0.2" × 0.2") for full-rated performance.
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 / 36.8 V at 1 mA - Verified breakdown threshold range ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 48.4 V at 8.3 A - Clamped voltage under 10/1000 μs surge; limits downstream IC stress to safe levels. |
| PPPM | 400 W - Peak pulse power handling capability with standardized waveform; enables robust protection against IEC 61000-4-5 Level 3 surges. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports high-energy transient absorption without failure. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 2.54 mm lead pitch; compatible with standard reflow profiles and J-STD-020 MSL level 1. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (either direction) | Acts as cathode during positive surge; accepts surge current from either terminal due to symmetrical structure. |
| Cathode | Transient current exit point (either direction) | Acts as anode during negative surge; completes low-impedance path to ground or return rail regardless of polarity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with JEDEC J-STD-20 and EU RoHS Directive 2011/65/EU, enabling green manufacturing. |
| 400 W peak pulse power | Supports IEC 61000-4-5 4 kV surge immunity testing with margin when mounted on recommended 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes voltage overshoot during clamping - critical for protecting 3.3 V and 5 V logic-level interfaces without over-stressing inputs. |
| MSL Level 1 moisture sensitivity | Enables unlimited floor life and standard reflow processing without baking; simplifies SMT line integration and inventory management. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role: Bidirectional clamping element placed between signal line and chassis ground, absorbing ±100 V transients. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V interface ICs while maintaining signal integrity during normal operation. |
Use Scenario: Safeguarding digital input channels in programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role: Primary overvoltage clamp on 24 V DC input terminals, shunting surge energy before reaching optocoupler or microcontroller input stage. Use Value: Eliminates need for external series impedance or RC filtering, reducing BOM count and board space in DIN-rail mounted modules. |
| Telecom Power Supply Rails | Consumer Appliance Motor Control |
|
Use Scenario: Suppressing induced surges on 48 V telecom power distribution boards caused by nearby lightning strikes or AC line coupling. IC Role / Device Role: Secondary protection device downstream of primary MOVs, providing precise clamping near sensitive DC-DC converter inputs. Use Value: Limits transient voltage to ≤48.4 V, ensuring reliable operation of 50 V-rated buck controllers and gate drivers. |
Use Scenario: Shielding microcontroller GPIOs and H-bridge gate drivers in washing machine and HVAC fan control boards from brush-commutator noise. IC Role / Device Role: Localized TVS on motor driver enable lines and feedback sensing paths, placed within 2 cm of protected IC pins. Use Value: Reduces electromagnetic interference-induced resets and false triggering without degrading PWM timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CAHE3_A/I | Same electrical specs but RoHS-compliant only (not halogen-free); lacks HM3 halogen-free certification. | Acceptable for commercial/industrial use where halogen-free requirement is not mandated (e.g., non-automotive consumer products). | Select if cost-sensitive and halogen-free material is not required by end-customer specification. |
| SMBJ30CAHM3_A/I | Higher 600 W peak pulse power rating; larger SMB (DO-214AA) package with 4.2 mm body width vs. SMA's 2.8 mm. | Better suited for higher-energy surge environments (e.g., outdoor telecom cabinets), but requires PCB layout change. | Choose when system-level surge testing exceeds 400 W or when thermal margin must be increased beyond 120 °C/W. |
Compared with SMAJ30CAHE3_A/I, the SMAJ30CAHM3_A/I adds halogen-free compliance for automotive AEC-Q101 systems; compared with SMBJ30CAHM3_A/I, it trades power headroom for compact size and lower parasitic inductance in space-constrained designs.
Availability
SMAJ30CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom power rail stabilization requiring stable component supply across extended production lifecycles.
Supply support for SMAJ30CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMAJ series is engineered specifically for high-reliability transient suppression in harsh environments, targeting AEC-Q101-compliant automotive subsystems and industrial control equipment demanding long-term stability and surge resilience.
FAQ
What does the 'HM3' suffix indicate in SMAJ30CAHM3_A/I?
The HM3 suffix in SMAJ30CAHM3_A/I denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-20 MSL Level 1 and AEC-Q101 qualification. It confirms compliance with automotive environmental standards and enables use in under-hood applications where halogen content restrictions apply. SMAJ30CAHM3_A/I is fully compatible with lead-free reflow processes and has no brominated flame retardants in its molding compound.
Is SMAJ30CAHM3_A/I suitable for protecting 3.3 V logic circuits?
Yes, SMAJ30CAHM3_A/I can protect 3.3 V logic circuits when used with appropriate series impedance (e.g., current-limiting resistor or ferrite bead) upstream. Its 30 V standoff voltage prevents conduction during normal operation, while its 48.4 V clamping voltage ensures that transient energy is shunted before downstream ICs experience destructive overvoltage. SMAJ30CAHM3_A/I is commonly deployed in this role for CAN transceivers and isolated sensor interfaces.
How does SMAJ30CAHM3_A/I differ from unidirectional SMAJ30A variants?
SMAJ30CAHM3_A/I is bidirectional, meaning it clamps voltage transients of either polarity symmetrically - essential for AC-coupled or floating signal lines. In contrast, unidirectional SMAJ30A conducts only in reverse bias and requires correct polarity placement. SMAJ30CAHM3_A/I has no cathode marking and delivers identical VBR, VC, and PPPM in both directions, making it ideal for differential buses like RS-485 or Ethernet PHY protection where polarity is undefined.
What is the minimum PCB copper pad size required for full 400 W rating of SMAJ30CAHM3_A/I?
The full 400 W peak pulse power rating of SMAJ30CAHM3_A/I is specified with 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay Document 88390 Figure 1. Smaller pads reduce thermal dissipation and require derating - e.g., 0.1" × 0.1" pads limit power to ~200 W. SMAJ30CAHM3_A/I must be placed directly on these pads with no thermal relief to maintain junction temperature within safe limits during surge events.
Does SMAJ30CAHM3_A/I meet IEC 61000-4-2 and IEC 61000-4-5 standards?
SMAJ30CAHM3_A/I is not certified to IEC 61000-4-2 or IEC 61000-4-5 as a standalone system-level solution, but its electrical characteristics - including 400 W peak pulse power (10/1000 μs), 48.4 V clamping voltage, and sub-nanosecond response - enable compliant circuit design when integrated per application-specific layout rules. SMAJ30CAHM3_A/I is routinely used in designs passing Level 4 ESD (±15 kV air, ±8 kV contact) and Level 3 surge (2 kV line-earth, 1 kV line-line) per those standards.
SMAJ30CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ30CAHM3_A/I FAQ
1.How can I place an order for SMAJ30CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30CAHM3_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 SMAJ30CAHM3_A/I reliable?
The price and inventory of SMAJ30CAHM3_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 SMAJ30CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ30CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30CAHM3_A/I?
SMAJ30CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30CAHM3_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 SMAJ30CAHM3_A/I?
For technical support, including SMAJ30CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ30CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ30CAHM3_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 SMAJ30CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ30CAHM3_A/I?
All SMAJ30CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30CAHM3_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 SMAJ30CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ30CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30CAHM3_A/I Tags
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