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Vishay General Semiconductor - Diodes Division SMAJ30CAHM3_A/H
- Part No.:
- SMAJ30CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30CAHM3_A/H.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,483
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Product details
Overview
SMAJ30CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage (VC) at 8.3 A peak pulse current (IPPM), and 400 W peak pulse power rating (10/1000 μs waveform), making it suitable for protecting MOSFETs, sensor interfaces, and automotive ECUs against inductive switching transients and ESD.
For engineers reviewing the SMAJ30CAHM3_A/H datasheet, SMAJ30CAHM3_A/H pinout, SMAJ30CAHM3_A/H application, or SMAJ30CAHM3_A/H equivalent, key selection criteria include its bidirectional polarity, DO-214AC (SMA) package compatibility with automated assembly, AEC-Q101 qualification for automotive use, and verified clamping performance under repetitive surge conditions.
Technical Context
This device operates as a voltage-clamped shunt protector: when reverse (or either polarity for bidirectional types) transient voltage exceeds the breakdown threshold (VBR min = 33.3 V), it avalanches to divert surge current away from downstream circuitry. Its low incremental surge resistance ensures minimal voltage overshoot during fast transients.
Thermal design relies on junction-to-lead thermal resistance (RθJL = 30 °C/W) and junction-to-ambient (RθJA = 120 °C/W) values, with derating required above TA = 25 °C per Figure 2. The 150 °C max junction temperature and MSL Level 1 moisture sensitivity support reflow-compatible manufacturing without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 33.3 V / 36.8 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold |
| VC @ IPPM | 48.4 V at 8.3 A - Clamped voltage seen by protected circuit during full-rated 10/1000 μs surge |
| PPPM | 400 W - Peak surge power handling capability with standard 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - Reverse leakage at 30 V ensures negligible standby power loss in high-impedance circuits |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - Industry-standard surface-mount outline with 5.28 mm length and 2.79 mm height |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Either terminal accepts surge current; symmetric conduction enables dual-polarity clamping |
| Cathode | Transient current entry (bidirectional) | No physical marking; terminals are functionally identical - no polarity orientation required during placement |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or differential lines (e.g., CAN, RS-485) without polarity constraints |
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental compliance requirements for industrial and consumer end equipment |
| MSL Level 1 rating | Allows direct placement on PCB without baking; compatible with standard 260 °C lead-free reflow profiles |
| 400 W peak pulse power (≤78 V) | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly mounted on 5 mm × 5 mm copper pads |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power rails in vehicle body control modules from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt TVS device placed directly across input rail to clamp transients before LDO or DC-DC converter input. Use Value: Withstands 400 W surges up to 10/1000 μs while limiting voltage to ≤48.4 V, preventing damage to 5 V logic supplies downstream. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC analog input cards in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional clamping element on 4–20 mA current loop or 0–10 V signal line to suppress EFT and surge coupling. Use Value: Symmetric VBR (33.3–36.8 V) and low leakage (<1 μA) preserve signal integrity while enabling ±48.4 V clamping during fault events. |
| Consumer USB Port ESD Protection | Telecom Data Line Surge Suppression |
|
Use Scenario: Secondary-level protection on USB 2.0 VBUS and D+/D− lines in set-top boxes and smart displays against contact ESD (IEC 61000-4-2 ±8 kV). IC Role / Device Role / Timing Role: Fast-response TVS placed adjacent to connector to absorb ESD energy before reaching USB transceiver IC. Use Value: Sub-nanosecond response time and 48.4 V clamping prevent latch-up or gate oxide rupture in USB PHY devices rated for 5.5 V absolute max. |
Use Scenario: Protecting Ethernet PHY interface pins (e.g., RJ45 magnetics secondary side) in VoIP phones and base stations from lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS on differential pairs to clamp common-mode transients without disrupting signal balance. Use Value: Matches IEEE 802.3af surge immunity requirements with 400 W rating and <0.1 % duty cycle capability for repetitive lightning strikes. |
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/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks HM3 halogen-free certification | Acceptable for commercial/industrial use where halogen-free mandate does not apply | Select when cost-sensitive designs prioritize RoHS compliance over halogen-free material requirements |
| SMBJ30CAHM3_A/H | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W PPPM rating | Better thermal dissipation for higher-energy surge environments (e.g., 24 V industrial buses) | Choose when board space allows larger footprint and system-level surge testing exceeds 400 W requirements |
Compared with SMAJ30CAHM3_A/H, SMAJ30CAHE3_A/H offers identical protection performance without halogen-free assurance, while SMBJ30CAHM3_A/H delivers higher surge margin in a less compact package - selection depends on mechanical constraints, material compliance mandates, and validated surge test levels.
Availability
SMAJ30CAHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, and telecom infrastructure requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for SMAJ30CAHM3_A/H 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, and protection devices with emphasis on reliability and automotive-grade validation.
The SMAJ series targets cost-effective, high-volume transient suppression in automotive, industrial, and consumer electronics - engineered for automated assembly and robust surge immunity in harsh environments.
FAQ
What is the clamping voltage of SMAJ30CAHM3_A/H at its rated peak pulse current?
The SMAJ30CAHM3_A/H has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current (IPPM) of 8.3 A under the standard 10/1000 μs waveform. This value is measured at the device terminals and represents the upper voltage limit imposed on protected circuitry during a full-rated transient event, ensuring downstream components remain within safe operating limits.
Is SMAJ30CAHM3_A/H suitable for automotive applications?
Yes, SMAJ30CAHM3_A/H is AEC-Q101 qualified and specifically designated for automotive use via the "HM3" suffix, indicating halogen-free, RoHS-compliant construction and validation for under-hood and chassis-mounted electronics. Its 150 °C maximum junction temperature and robust surge rating make it appropriate for engine control units, body modules, and ADAS sensor interfaces.
How does the bidirectional configuration of SMAJ30CAHM3_A/H affect PCB layout?
The SMAJ30CAHM3_A/H has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout for AC-coupled or differential signal lines (e.g., CAN, RS-485), reduces assembly errors, and avoids the need for silkscreen polarity indicators - unlike unidirectional variants such as SMAJ30AHM3_A/H.
What is the thermal resistance profile of SMAJ30CAHM3_A/H?
SMAJ30CAHM3_A/H exhibits a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient resistance (RθJA) of 120 °C/W when mounted on the recommended 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads. These values enable accurate thermal modeling for surge duty-cycle derating and ensure reliable operation up to +150 °C junction temperature under defined PCB layout conditions.
Does SMAJ30CAHM3_A/H meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, SMAJ30CAHM3_A/H meets MSL Level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into standard lead-free reflow ovens with peak temperatures up to 260 °C without pre-baking. This eliminates moisture-related defects like popcorning and supports high-yield automated assembly in commercial and automotive manufacturing lines.
SMAJ30CAHM3_A/H 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/H FAQ
1.How can I place an order for SMAJ30CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30CAHM3_A/H 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/H reliable?
The price and inventory of SMAJ30CAHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMAJ30CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30CAHM3_A/H?
SMAJ30CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30CAHM3_A/H 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/H?
For technical support, including SMAJ30CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ30CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ30CAHM3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMAJ30CAHM3_A/H?
All SMAJ30CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30CAHM3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMAJ30CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30CAHM3_A/H Tags
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