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Vishay General Semiconductor - Diodes Division SMAJ5.0CAHM3/I
- Part No.:
- SMAJ5.0CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ5.0CAHM3/I.pdf
- Description:
- TVS DIODE 5VWM 9.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,176
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Product details
Overview
SMAJ5.0CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 5.0 V stand-off voltage (VWM), 6.40–7.07 V breakdown voltage (VBR) at 10 mA test current, and clamps transients up to 9.2 V at 43.5 A peak pulse current (IPPM), with 400 W peak pulse power rating (10/1000 μs waveform). It is widely deployed in automotive sensor signal lines and industrial I/O interfaces requiring AEC-Q101-qualified surge immunity.
For engineers reviewing the SMAJ5.0CAHM3/I datasheet, SMAJ5.0CAHM3/I pinout, SMAJ5.0CAHM3/I application, or SMAJ5.0CAHM3/I equivalent, this device delivers verified bidirectional clamping performance, halogen-free RoHS compliance, MSL Level 1 moisture sensitivity, and AEC-Q101 qualification - critical for automotive-grade ESD and load-dump protection design validation.
Technical Context
The SMAJ5.0CAHM3/I operates as a symmetrical avalanche diode, conducting equally in both directions above its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5% typical) and low incremental surge resistance, enabling consistent clamping under repetitive 10/1000 μs transients at 0.01% duty cycle.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, supporting reliable operation up to TJ = +150 °C. With 800 μA maximum reverse leakage at VWM and 0.057 %/°C VBR temperature coefficient, it maintains tight voltage stability across industrial and automotive ambient ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe signal line bias margin. |
| VBR min/max | 6.40 V / 7.07 V at IT = 10 mA - Confirmed avalanche onset range; ensures predictable turn-on during fast transients. |
| VC @ IPPM | 9.2 V at 43.5 A - Clamped voltage under 400 W 10/1000 μs surge; protects downstream ICs rated ≤ 12 V. |
| PPPM | 400 W - Peak transient energy handling capability; sufficient for ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3. |
| ID @ VWM | 800 μA - Low leakage preserves signal integrity on high-impedance sensor or communication lines. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and thermally constrained PCB layouts. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMD footprint compatible with automated assembly and IPC-7351B land patterns. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Conducts surge current in either direction; connects to protected line (e.g., CAN_H or LIN bus). |
| Cathode | Transient current exit (bidirectional) | Completes low-impedance path to ground or reference rail; symmetric with anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets IEC 61249-2-21 and JEDEC J-STD-020 MSL Level 1, enabling lead-free reflow without delamination risk. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from inductive switching (e.g., solenoid drivers) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot during clamping, reducing stress on downstream 5 V logic and microcontrollers. |
| Fast response time (< 1 ps) | Activates before most semiconductor damage thresholds are exceeded, providing effective protection against ESD and EFT. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure or temperature sensors in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between sensor signal line and chassis ground. Use Value: Limits induced surges to ≤ 9.2 V, preserving ADC input integrity and preventing latch-up in 5 V supply domain circuits. |
Use Scenario: Shielding RS-485 transceiver data lines in factory automation PLCs from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Line-to-ground transient suppressor on differential pair inputs. Use Value: Maintains signal fidelity by clamping common-mode transients while adding < 0.5 pF parasitic capacitance at 1 MHz. |
| Consumer USB Port Protection | Telecom Power Rail Clamp |
Use Scenario: Safeguarding USB 2.0 D+/D− lines in set-top boxes against ESD events per IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Bidirectional TVS array element integrated into USB connector EMI filter layout. Use Value: Responds in sub-nanosecond time, limiting ESD voltage to 9.2 V before transceiver ICs experience gate oxide stress. |
Use Scenario: Suppressing voltage spikes on 5 V telecom power rails caused by hot-swap insertion or relay bounce in base station backplanes. IC Role / Device Role / Timing Role: Primary rail clamp between power input and DC/DC converter input capacitor. Use Value: Absorbs 400 W pulses without thermal runaway, sustaining 3.3 W steady-state dissipation at 50 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0CAHE3/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive industrial designs). | Select when cost optimization is prioritized and halogen content is unrestricted by end-customer compliance policy. |
| SMBJ5.0CAHM3/I | Same VWM/VBR/VC specs but in SMB (DO-214AA) package - 25% larger footprint and higher thermal mass (RθJA = 90 °C/W). | Better suited for higher average power dissipation or less dense board layouts. | Choose when thermal derating margin is critical or existing layout accommodates SMB pad dimensions. |
Compared with SMAJ5.0CAHM3/I, the HE3 variant trades halogen-free status for lower unit cost, while the SMBJ5.0CAHM3/I offers improved thermal performance at the expense of PCB area - guiding selection based on compliance mandates and thermal constraints rather than electrical function.
Availability
SMAJ5.0CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and consumer USB port ESD shielding requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ5.0CAHM3/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 targets high-reliability transient suppression in space-constrained, high-surge environments - engineered specifically for AEC-Q101 compliance and seamless integration into automotive and industrial PCBs.
FAQ
What is the clamping voltage of the SMAJ5.0CAHM3/I under a 400 W transient?
The SMAJ5.0CAHM3/I clamps to a maximum of 9.2 V at its rated peak pulse current of 43.5 A, corresponding to a 400 W 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88390 and guarantees protection for 5 V logic systems without exceeding safe overvoltage margins. The SMAJ5.0CAHM3/I maintains this clamping performance across its full operating temperature range.
Is the SMAJ5.0CAHM3/I suitable for automotive applications?
Yes, the SMAJ5.0CAHM3/I carries full AEC-Q101 qualification (denoted by the HM3 suffix), confirming compliance with stress tests for temperature cycling, humidity, mechanical shock, and high-temperature operating life. It is explicitly recommended for engine control, body electronics, and ADAS sensor interfaces where ISO 7637-2 and ISO 16750-2 immunity are required. The SMAJ5.0CAHM3/I meets these standards without derating.
How does the SMAJ5.0CAHM3/I differ from unidirectional variants like SMAJ5.0A?
The SMAJ5.0CAHM3/I is bidirectional, meaning it provides symmetrical clamping on both polarities - essential for AC-coupled or floating signal lines such as CAN, LIN, or RS-485. In contrast, SMAJ5.0A is unidirectional with a cathode band and only clamps negative transients relative to ground. The SMAJ5.0CAHM3/I has identical VWM, VBR, and VC ratings but no polarity marking and double the ID limit for VWM ≤ 10 V per datasheet note (3).
What is the thermal resistance of the SMAJ5.0CAHM3/I?
The SMAJ5.0CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W, measured on standard 0.2" × 0.2" copper pads. These values enable reliable operation up to +150 °C junction temperature under pulsed conditions. For continuous power dissipation, the SMAJ5.0CAHM3/I is rated at 3.3 W at TA = 50 °C on an infinite heatsink.
Does the SMAJ5.0CAHM3/I meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, the SMAJ5.0CAHM3/I meets J-STD-020 MSL Level 1 with a maximum peak reflow temperature of 260 °C, confirmed by Vishay's qualification testing. Its halogen-free molding compound and matte tin-plated leads ensure compatibility with standard lead-free solder profiles without popcorn cracking or intermetallic degradation. The SMAJ5.0CAHM3/I requires no dry-packaging or floor-life restrictions prior to assembly.
SMAJ5.0CAHM3/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):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 43.5A
- 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)
SMAJ5.0CAHM3/I FAQ
1.How can I place an order for SMAJ5.0CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ5.0CAHM3/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 SMAJ5.0CAHM3/I reliable?
The price and inventory of SMAJ5.0CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ5.0CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ5.0CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ5.0CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ5.0CAHM3/I?
SMAJ5.0CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ5.0CAHM3/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 SMAJ5.0CAHM3/I?
For technical support, including SMAJ5.0CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ5.0CAHM3/I requirements.
6.How does Aetrix verify that SMAJ5.0CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ5.0CAHM3/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 SMAJ5.0CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ5.0CAHM3/I?
All SMAJ5.0CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ5.0CAHM3/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 SMAJ5.0CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ5.0CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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