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Vishay General Semiconductor - Diodes Division SMAJ30CAHM3/H
- Part No.:
- SMAJ30CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30CAHM3/H.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,599
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Product details
Overview
SMAJ30CAHM3/H 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 power and signal lines. It features a 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage at 8.3 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ30CAHM3/H datasheet, SMAJ30CAHM3/H pinout, SMAJ30CAHM3/H application, or SMAJ30CAHM3/H equivalent, key selection criteria include bidirectional surge suppression capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT assembly on PCBs requiring transient immunity per IEC 61000-4-5.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ps), low incremental surge resistance, and stable clamping under repetitive 10/1000 μs transients up to 0.01% duty cycle.
The SMAJ30CAHM3/H is rated for -55 °C to +150 °C operating junction temperature, exhibits 0.099 %/°C temperature coefficient of VBR, and achieves thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads - making it suitable for compact, thermally constrained layouts in automotive ECUs and industrial PLC I/O modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1 mA - Confirmed minimum/maximum breakdown threshold ensuring reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 48.4 V at IPPM = 8.3 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Sustained transient energy absorption capability under standardized 10/1000 μs waveform without failure. |
| ID (Reverse Leakage) | 1.0 μA max at VWM - Negligible standby current draw that avoids loading sensitive reference or bias networks. |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22-A108. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Molding compound meets UL 94 V-0. Polarity: unmarked for bidirectional types; no cathode/anode designation required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | Either end serves as input/output for transient energy; no polarity sensitivity simplifies PCB layout and eliminates orientation errors during placement. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without derating in typical board layouts. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics including engine control units, body controllers, and ADAS sensor interfaces. |
| Low profile SMA package | Height ≤ 2.29 mm allows integration into space-constrained modules such as CAN/LIN transceiver assemblies and motor driver PCBs. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh industrial environments. |
| MSL Level 1 (260 °C peak reflow) | Supports lead-free soldering without preconditioning; compatible with standard SMT reflow profiles used in high-volume manufacturing. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in vehicle body control modules from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly across input terminals of DC/DC converters and LDO regulators. Use Value: Limits transient excursions to ≤48.4 V, preventing latch-up or permanent damage to 36 V-rated power management ICs. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loops) in pressure/temperature sensors deployed in factory automation. IC Role / Device Role / Timing Role: Bidirectional shunt suppressor mounted at connector entry point to divert ESD and switching noise. Use Value: Sub-1 ns response ensures clamping occurs before sensitive op-amps or ADC drivers experience overvoltage stress. |
| Consumer Device USB Port Protection | Telecom Equipment Data Line Protection |
Use Scenario: Safeguarding USB 2.0 VBUS and D+/D− lines in smart home hubs against ESD and hot-plug induced spikes. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS integrated adjacent to USB connector footprint. Use Value: 1.0 μA leakage at 30 V avoids degrading USB suspend current budget while maintaining ±15 kV contact ESD immunity. |
Use Scenario: Guarding RS-485 transceiver inputs in base station remote radio units exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on differential bus lines upstream of isolated signal conditioning stage. Use Value: 400 W rating sustains multiple 10/1000 μs surges up to 4 kV without degradation, extending field service life. |
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/H | Same electrical specs but RoHS-compliant commercial grade (non-halogen-free); lacks AEC-Q101 qualification. | Suitable for non-automotive industrial or consumer applications where halogen-free requirement is not mandated. | Select SMAJ30CAHE3/H when cost optimization is prioritized and automotive qualification is unnecessary. |
| SMBJ30CAHM3 | Same VWM/VC ratings but SMB (DO-214AA) package - 2.6 mm wider, 0.3 mm taller; 600 W PPPM rating. | Offers higher surge handling in same voltage class but requires larger PCB area and different pad layout. | Choose SMBJ30CAHM3 only if system-level surge test requirements exceed 400 W and board space permits larger footprint. |
Compared with SMAJ30CAHE3/H, the SMAJ30CAHM3/H adds halogen-free compliance and AEC-Q101 validation without altering clamping performance; versus SMBJ30CAHM3, it trades 200 W extra pulse power for 30% smaller board area and identical thermal profile on standard pads.
Availability
SMAJ30CAHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom data line protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ30CAHM3/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, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMAJ series was engineered for high-reliability transient suppression in automotive, industrial, and communications infrastructure - delivering consistent clamping behavior, AEC-Q101 validation, and optimized SMT manufacturability.
FAQ
What is the clamping voltage of the SMAJ30CAHM3/H under a 10/1000 μs surge?
The SMAJ30CAHM3/H has a maximum clamping voltage (VC) of 48.4 V at 8.3 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and defines the upper voltage limit imposed on protected circuits during standardized surge events. The SMAJ30CAHM3/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMAJ30CAHM3/H suitable for automotive applications?
Yes, the SMAJ30CAHM3/H is AEC-Q101 qualified and specifically designed for automotive use. Its HM3 suffix denotes halogen-free, RoHS-compliant construction with full qualification for temperature cycling, highly accelerated life testing (HALT), and ESD robustness. The SMAJ30CAHM3/H is commonly deployed in body control modules, infotainment power supplies, and ADAS sensor interfaces where reliability under thermal and electrical stress is critical.
Does the SMAJ30CAHM3/H have polarity markings on the package?
No, the SMAJ30CAHM3/H does not feature polarity markings because it is a bidirectional TVS diode. Its symmetrical construction means either terminal can serve as anode or cathode depending on transient polarity - eliminating orientation constraints during automated placement. This contrasts with unidirectional variants (e.g., SMAJ30A) which use a band to indicate the cathode end.
What is the thermal resistance of the SMAJ30CAHM3/H in standard mounting conditions?
The SMAJ30CAHM3/H 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, per Vishay's recommended layout. Its junction-to-lead resistance (RθJL) is 30 °C/W. These values enable accurate thermal modeling in applications such as automotive power distribution boxes where ambient temperatures may reach 105 °C.
How does the SMAJ30CAHM3/H compare to the SMAJ30A variant?
The SMAJ30CAHM3/H is bidirectional with symmetrical clamping in both polarities, while the SMAJ30A is unidirectional and conducts only in reverse bias. The SMAJ30CAHM3/H supports AC-coupled or floating signal lines (e.g., RS-485, CAN), whereas SMAJ30A is limited to DC-biased rails like 12 V supplies. Both share identical VWM (30 V), VC (48.4 V), and PPPM (400 W), but only the SMAJ30CAHM3/H carries AEC-Q101 and halogen-free certifications.
SMAJ30CAHM3/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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMAJ30CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30CAHM3/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/H reliable?
The price and inventory of SMAJ30CAHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMAJ30CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30CAHM3/H?
SMAJ30CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30CAHM3/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/H?
For technical support, including SMAJ30CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30CAHM3/H requirements.
6.How does Aetrix verify that SMAJ30CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ30CAHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMAJ30CAHM3/H?
All SMAJ30CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30CAHM3/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/H part is unused and in its original packaging.
Return procedure for SMAJ30CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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