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Vishay General Semiconductor - Diodes Division SMAJ100CAHM3/H
- Part No.:
- SMAJ100CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100CAHM3/H.pdf
- Description:
- TVS DIODE 100VWM 162VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,683
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Product details
Overview
SMAJ100CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 100 V stand-off voltage (VWM), 111–123 V breakdown voltage (VBR) at 1 mA, 162 V maximum clamping voltage (VC) at 1.9 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), commonly deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ100CAHM3/H datasheet, SMAJ100CAHM3/H pinout, SMAJ100CAHM3/H application, or SMAJ100CAHM3/H equivalent, key selection considerations include its bidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the low incremental surge resistance supports rapid energy diversion during ESD or lightning-induced surges.
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It meets MSL Level 1 per J-STD-020 and withstands 260 °C lead-free reflow peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for protected circuitry. |
| VBR min/max | 111 V / 123 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 162 V at 1.9 A - Clamping voltage under standardized 10/1000 μs surge; determines worst-case stress on downstream components. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge power handling capability; defines transient energy absorption capacity. |
| ID @ VWM | ≤1.0 μA - Reverse leakage current at stand-off voltage; critical for low-power or high-impedance signal line protection. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.28 mm × 4.50 mm footprint; compatible with standard SMT assembly and IPC-7351B land patterns. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1, 260 °C reflow compatible. Bidirectional configuration has no polarity marking - both terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no cathode band marking required for bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms compliance with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU, supporting green manufacturing. |
| 400 W peak pulse power | Handles high-energy transients from inductive load switching (e.g., solenoid drivers) without degradation under repetitive duty cycle ≤0.01 %. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage overshoot during clamping, reducing stress on protected ICs such as CAN transceivers or microcontrollers. |
| Fast response time (<1 ps) | Clamps within picoseconds of transient onset, preventing damage to fast-edge digital interfaces and analog front-ends. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed control modules against load dump and alternator ripple transients in passenger vehicles. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between power input and DC-DC converter input stage. Use Value: Withstands 400 W surges and maintains <1.0 μA leakage at 100 V VWM, preserving efficiency and enabling AEC-Q101-compliant system certification. |
Use Scenario: Shielding 4–20 mA current loop outputs of pressure/temperature sensors from ESD and field wiring faults. IC Role / Device Role / Timing Role: Bidirectional shunt protector across signal and return lines, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Symmetric clamping at 162 V ensures equal protection for positive/negative transients without polarity concerns on floating analog paths. |
| Telecom Interface Surge Suppression | Consumer Device USB Port Protection |
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul equipment exposed to induced lightning surges. IC Role / Device Role / Timing Role: Secondary-level TVS placed after gas discharge tube (GDT) primary protection, limiting let-through voltage. Use Value: 120 °C/W RθJA allows direct mounting on PCB without heatsink, simplifying layout while maintaining thermal safety under repeated surges. |
Use Scenario: Adding robustness to USB 2.0 data lines (D+/D−) in smart home hubs against user-handling ESD. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (CJ ≈ 100 pF at 0 V) minimizing signal integrity impact. Use Value: Glass-passivated junction ensures stable VBR over lifetime, avoiding drift-related false triggering in high-volume consumer production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ100CAHE3/H | Same electrical specs and package; RoHS-compliant but not halogen-free (E3 vs HM3). | Lacks halogen-free certification; unsuitable for strict environmental compliance programs (e.g., Apple QDB, Sony Green Partner). | Select SMAJ100CAHE3/H only if halogen-free requirement is waived and cost is prioritized. |
| SMBJ100CAHM3 | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; 600 W PPPM rating. | Higher power handling enables use in higher-energy systems (e.g., 24 V truck electronics), but requires larger PCB area. | Choose SMBJ100CAHM3 when surge energy exceeds 400 W or board space permits larger footprint. |
Compared with SMAJ100CAHE3/H, the SMAJ100CAHM3/H adds halogen-free compliance without sacrificing performance; versus SMBJ100CAHM3, it trades 200 W pulse power headroom for 30 % smaller PCB area and identical AEC-Q101 qualification.
Availability
SMAJ100CAHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom infrastructure modules, and consumer USB protection circuits requiring stable component supply and full environmental compliance.
Supply support for SMAJ100CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMAJ series targets surface-mount transient suppression in space-constrained, high-reliability applications-designed specifically for automotive, industrial, and telecom systems needing AEC-Q101 validation and consistent clamping performance.
FAQ
What does the 'HM3' suffix indicate in SMAJ100CAHM3/H?
The HM3 suffix in SMAJ100CAHM3/H denotes halogen-free, RoHS-compliant construction meeting IEC 61249-2-21 requirements, plus AEC-Q101 qualification for automotive use. It also specifies matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards, distinguishing it from E3 (RoHS only) and HE3 (AEC-Q101 but not halogen-free) variants of the SMAJ100CAHM3/H.
Is SMAJ100CAHM3/H suitable for protecting CAN bus lines?
Yes, SMAJ100CAHM3/H is suitable for CAN bus protection when used in conjunction with appropriate common-mode chokes and filtering. Its 100 V VWM exceeds typical CAN bus operating voltages (±40 V common-mode range), and its 162 V VC limits transients to levels within ISO 11898-2 fault tolerance. The bidirectional configuration matches the differential nature of CAN signaling, and its AEC-Q101 qualification supports automotive CAN FD implementations.
How does the clamping voltage of SMAJ100CAHM3/H compare to its breakdown voltage?
SMAJ100CAHM3/H has a minimum breakdown voltage (VBR) of 111 V and a maximum clamping voltage (VC) of 162 V at 1.9 A IPPM, yielding a clamping ratio of approximately 1.46. This ratio reflects the device's ability to limit overvoltage stress during surge events-lower ratios indicate tighter clamping. The 51 V difference between VC and VBR represents the dynamic voltage rise under surge current, directly impacting protected circuit margin.
Can SMAJ100CAHM3/H be used in place of a unidirectional TVS like SMAJ100A?
No-SMAJ100CAHM3/H is strictly bidirectional and lacks polarity marking, making it incompatible with circuits requiring unidirectional conduction (e.g., DC power rail protection where reverse polarity must be blocked). SMAJ100A provides forward conduction and reverse blocking; substituting SMAJ100CAHM3/H would allow unintended reverse current flow and fail to block DC reverse voltage, risking system malfunction.
What is the maximum allowable PCB pad size for optimal thermal performance of SMAJ100CAHM3/H?
For optimal thermal performance, SMAJ100CAHM3/H should be mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet for rated 400 W pulse power. Smaller pads increase thermal resistance beyond the rated 120 °C/W (RθJA), reducing surge capability and accelerating junction temperature rise-especially critical in automotive under-hood applications where ambient temperatures exceed 85 °C.
SMAJ100CAHM3/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):
- 100V
- Voltage - Breakdown (Min):
- 111V
- Voltage - Clamping (Max) @ Ipp:
- 162V
- Current - Peak Pulse (10/1000µs):
- 1.9A
- 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)
SMAJ100CAHM3/H FAQ
1.How can I place an order for SMAJ100CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100CAHM3/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 SMAJ100CAHM3/H reliable?
The price and inventory of SMAJ100CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ100CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ100CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100CAHM3/H?
SMAJ100CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100CAHM3/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 SMAJ100CAHM3/H?
For technical support, including SMAJ100CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100CAHM3/H requirements.
6.How does Aetrix verify that SMAJ100CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ100CAHM3/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 SMAJ100CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ100CAHM3/H?
All SMAJ100CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100CAHM3/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 SMAJ100CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ100CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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