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Vishay General Semiconductor - Diodes Division SMAJ30CAHM3/I
- Part No.:
- SMAJ30CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ30CAHM3/I.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,174
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Product details
Overview
SMAJ30CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust ESD and surge protection on signal/power lines. It features a 30 V standoff voltage (VWM), 48.4 V maximum clamping voltage (VC) at 8.3 A peak pulse current, and 400 W peak pulse power rating (10/1000 μs waveform), making it suitable for protecting automotive sensor interfaces and industrial I/O circuits against inductive switching transients.
For engineers reviewing the SMAJ30CAHM3/I datasheet, SMAJ30CAHM3/I pinout, SMAJ30CAHM3/I application, or SMAJ30CAHM3/I equivalent, this device is evaluated for bidirectional overvoltage clamping in 12 V–24 V systems where low-leakage (<1.0 μA at VWM), fast response (<1 ps), and AEC-Q101 qualification are required.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse (or forward, in bidirectional mode) voltage exceeds its breakdown threshold (33.3–36.8 V at 1 mA), it avalanches to divert surge current away from downstream circuitry. Its low incremental surge resistance ensures stable clamping under repetitive 10/1000 μs pulses up to 0.01% duty cycle.
Designed for surface-mount assembly in SMA (DO-214AC) package, it delivers thermal performance with RθJA = 120 °C/W and operates across –55 °C to +150 °C junction temperature range. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101 qualified construction per JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 30 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping onset. |
| VBR (Breakdown Voltage) | 33.3–36.8 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering without premature conduction. |
| VC (Clamping Voltage) | 48.4 V at 8.3 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream ICs. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy-handling capability for standard lightning/surge waveforms; derates to 300 W above 78 V. |
| IPPM (Peak Pulse Current) | 8.3 A - Maximum non-repetitive surge current the device can safely clamp; derived from VC and PPPM. |
| ID (Max Reverse Leakage) | 1.0 μA at VWM - Minimal standby power loss and signal integrity impact in high-impedance sensing paths. |
| TJmax | +150 °C - Enables operation in under-hood automotive and industrial environments without thermal shutdown. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode / Anode (symmetrical) | Bidirectional surge path | Both terminals function identically; no cathode band marking - enables placement flexibility and eliminates orientation errors in automated assembly. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical shock - supports under-hood and ADAS sensor applications. |
| 400 W peak pulse power (10/1000 μs) | Handles IEC 61000-4-5 Level 4 surges (4 kV line-to-earth) without degradation when mounted on 5 mm × 5 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients - critical for safeguarding 3.3 V/5 V logic inputs and analog front-ends. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental compliance requirements without compromising surge robustness or thermal stability. |
| MSL Level 1 (260 °C reflow) | Supports single-pass lead-free reflow assembly without moisture-related popcorning or delamination risks. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and pressure/temperature sensor outputs in engine control modules. IC Role / Device Role: Bidirectional shunt clamping element placed between signal line and ground. Use Value: Limits induced transients from solenoid switching to ≤48.4 V, preventing latch-up or damage to 5 V tolerant microcontrollers. |
Use Scenario: Safeguarding PLC digital input channels exposed to 24 V DC field wiring. IC Role / Device Role: Primary surge suppression component on each input channel before optocoupler isolation. Use Value: Absorbs 400 W surges from relay coil back-EMF while maintaining <1 μA leakage to ensure clean logic-level detection. |
| Consumer USB Port ESD Protection | Telecom Line Interface |
|
Use Scenario: Secondary ESD protection on USB 2.0 D+/D− lines behind primary polymer TVS. IC Role / Device Role: Low-capacitance (<50 pF) clamping diode for ±15 kV contact discharge (IEC 61000-4-2). Use Value: Clamps ESD events within 1 ps while adding negligible signal distortion - preserves USB full-speed timing margins. |
Use Scenario: Overvoltage protection on RS-485 transceiver bus lines in base station remote units. IC Role / Device Role: Bidirectional rail-to-rail clamp between differential pair and ground reference. Use Value: Withstands repeated 10/1000 μs surges up to 4 kV (IEC 61000-4-5) without parameter shift or failure. |
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/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker rating. | Suitable for commercial/industrial use where halogen-free requirement is absent. | Select SMAJ30CAHE3/I only if halogen-free certification is not mandated by end-customer specifications. |
| SMBJ30CAHM3/I | Same VWM, VBR, VC; higher PPPM = 600 W; larger SMB (DO-214AA) package (4.58 mm × 3.94 mm vs. SMA's 4.50 mm × 2.79 mm). | Preferred where higher surge margin is needed and PCB space allows larger footprint. | Choose SMBJ30CAHM3/I when system-level surge testing exceeds 400 W requirements or layout permits larger package. |
Compared with SMAJ30CAHM3/I, SMAJ30CAHE3/I offers identical clamping performance but reduced environmental compliance, while SMBJ30CAHM3/I provides 50% higher surge capacity at the cost of increased board area - enabling trade-offs between footprint, reliability, and robustness.
Availability
SMAJ30CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial digital I/O protection, consumer USB port ESD protection, and telecom line interface applications requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ30CAHM3/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-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where consistent clamping, low leakage, and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMAJ30CAHM3/I at its rated peak pulse current?
The SMAJ30CAHM3/I has a maximum clamping voltage (VC) of 48.4 V at 8.3 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees the protected circuit will not experience more than 48.4 V during a defined surge event, directly supporting design margin calculations for 3.3 V and 5 V ICs.
Is SMAJ30CAHM3/I suitable for automotive applications?
Yes, SMAJ30CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and JESD201 Class 2 whisker-tested construction. It is explicitly rated for automotive use in engine control, body electronics, and ADAS sensor modules where extended temperature operation (–55 °C to +150 °C) and surge immunity are required.
How does the bidirectional configuration of SMAJ30CAHM3/I affect PCB layout?
The SMAJ30CAHM3/I has no polarity marking and symmetrical terminal behavior, eliminating orientation constraints during placement. This simplifies automated assembly, reduces misplacement risk, and allows flexible routing on differential or AC-coupled lines - unlike unidirectional variants that require strict cathode alignment.
What is the thermal resistance of SMAJ30CAHM3/I, and how does it impact power dissipation?
SMAJ30CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended pad layout. At its rated 3.3 W steady-state power dissipation (PD), this results in ~400 °C rise - confirming it is intended for transient-only operation; continuous power must remain well below PD to avoid thermal runaway.
Does SMAJ30CAHM3/I meet industry-standard surge test requirements?
Yes, SMAJ30CAHM3/I meets IEC 61000-4-5 (surge immunity) and IEC 61000-4-2 (ESD) requirements when applied per Vishay's recommended layout - including 5.0 mm × 5.0 mm copper pads per terminal. Its 400 W peak pulse rating corresponds to Level 4 (4 kV line-to-earth) testing under standard 10/1000 μs waveform conditions.
SMAJ30CAHM3/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:
- 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/I FAQ
1.How can I place an order for SMAJ30CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ30CAHM3/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/I reliable?
The price and inventory of SMAJ30CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ30CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ30CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ30CAHM3/I?
SMAJ30CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ30CAHM3/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/I?
For technical support, including SMAJ30CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ30CAHM3/I requirements.
6.How does Aetrix verify that SMAJ30CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ30CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ30CAHM3/I?
All SMAJ30CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ30CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ30CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ30CAHM3/I Tags
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