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Vishay General Semiconductor - Diodes Division SMAJ100AHM3_A/H
- Part No.:
- SMAJ100AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100AHM3_A/H.pdf
- Description:
- TVS DIODE 100VWM 162VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ100AHM3_A/H from Vishay General Semiconductor is a unidirectional 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 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). It is used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial electronics against ESD and inductive switching surges.
For engineers reviewing the SMAJ100AHM3_A/H datasheet, SMAJ100AHM3_A/H pinout, SMAJ100AHM3_A/H application, or SMAJ100AHM3_A/H equivalent, key selection criteria include clamping voltage margin relative to protected circuit's absolute maximum rating, thermal resistance (RθJA = 120 °C/W), AEC-Q101 qualification status, unidirectional polarity marking, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device that remains high-impedance below VWM (100 V) and rapidly transitions to low-impedance conduction above VBR (min 111 V) to divert surge current. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), critical for suppressing fast-rising transients from relay switching or ESD events.
The device is rated for 400 W peak pulse power (10/1000 μs) up to 78 V and derates to 300 W above 78 V; SMAJ100AHM3_A/H falls in the latter category. Its 1.0 μA max reverse leakage at VWM and 0.107 %/°C temperature coefficient of VBR support stable operation across -55 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected line's normal operating range. |
| VBR (min/max) | 111 V / 123 V at 1 mA - Confirmed breakdown threshold; defines minimum overvoltage level at which clamping reliably initiates. |
| VC @ IPPM | 162 V at 1.9 A - Clamped voltage during 10/1000 μs surge; must remain below protected IC's absolute maximum rating. |
| PPPM | 300 W - Peak pulse power rating above 78 V; determines survivability under repetitive transient stress per JEDEC standards. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard PCB pad; dictates required board copper area for thermal management. |
| TJ max. | +150 °C - Maximum allowable junction temperature; enables use in under-hood automotive environments. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by band on body; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W / 300 W peak pulse power | Enables robust suppression of IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without degradation on standard PCB layout. |
| Glass passivated junction | Ensures consistent VBR tolerance and long-term stability under thermal cycling and humidity exposure. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow soldering without preconditioning; compatible with standard SMT assembly lines. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics applications requiring zero-defect reliability. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast transients, improving protection margin for 3.3 V/5 V logic interfaces. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power rails from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between VCC and GND, activated within <1 ns of overvoltage onset. Use Value: Limits clamped voltage to 162 V, well below typical automotive IC breakdown thresholds, while surviving 300 W surges per ISO 7637-2 Pulse 5a. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in PLC modules from field-induced noise and cable discharge events. IC Role / Device Role / Timing Role: Standoff-mode protector on 0–10 V or 4–20 mA signal paths, conducting only during >100 V transients. Use Value: Maintains <1.0 μA leakage at 100 V, preventing signal offset errors; clamps sub-μs ESD pulses to safe levels without affecting DC accuracy. |
| Consumer Device USB Port Protection | Telecom Equipment DC Input Stage |
|
Use Scenario: Safeguarding USB VBUS lines in portable chargers and docking stations against hot-plug and ESD events. IC Role / Device Role / Timing Role: Primary-level TVS on input side of USB power switch, absorbing 8 kV contact ESD per IEC 61000-4-2. Use Value: Fast response and low clamping voltage preserve integrity of downstream USB PD controllers; MSL Level 1 supports automated assembly. |
Use Scenario: Front-end surge suppression on -48 V telecom rectifier outputs exposed to lightning-induced surges on outside plant wiring. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to negative rail, shunting positive-going transients to return path. Use Value: 300 W rating and 150 °C TJ max enable reliable operation in sealed, high-temperature telecom cabinets without forced cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ100AHE3_A/H | Same electrical specs but RoHS-compliant commercial grade (non-AEC-Q101); no halogen-free certification. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMAJ100AHE3_A/H for cost-sensitive non-automotive applications requiring identical clamping performance. |
| SMBJ100A-H | Higher 600 W PPPM rating (10/1000 μs); larger SMB (DO-214AA) package; RθJA = 85 °C/W. | Better surge handling but requires more PCB area; less suitable for space-constrained automotive modules. | Choose SMBJ100A-H when higher single-pulse energy absorption is needed and board space permits larger footprint. |
Compared with SMAJ100AHM3_A/H, SMAJ100AHE3_A/H offers identical protection performance without automotive qualification, while SMBJ100A-H trades smaller size for greater pulse power and improved thermal dissipation-making each optimal for distinct mechanical and reliability requirements.
Availability
SMAJ100AHM3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supply designs requiring stable component supply, AEC-Q101 compliance, and surface-mount transient suppression capability.
Supply support for SMAJ100AHM3_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, 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-particularly automotive, industrial, and telecom applications where compact size, AEC-Q101 validation, and precise clamping control are essential.
FAQ
What is the clamping voltage of SMAJ100AHM3_A/H at its rated peak pulse current?
The SMAJ100AHM3_A/H has a maximum clamping voltage (VC) of 162 V at 1.9 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value is critical for ensuring the protected circuit remains below its absolute maximum voltage rating during surge events. The SMAJ100AHM3_A/H achieves this clamping performance while maintaining low leakage and fast response, making it suitable for sensitive 12 V and 24 V automotive and industrial systems.
Is SMAJ100AHM3_A/H qualified for automotive applications?
Yes, SMAJ100AHM3_A/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" (halogen-free, RoHS-compliant, and AEC-Q101 qualified). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD, validating its suitability for automotive powertrain, body control, and ADAS subsystems. The SMAJ100AHM3_A/H meets the reliability requirements for under-hood and cabin-mounted electronics.
What is the thermal resistance of SMAJ100AHM3_A/H, and how does it affect PCB layout?
The SMAJ100AHM3_A/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. This value directly impacts PCB thermal design: insufficient copper area raises junction temperature during repetitive surges, potentially degrading long-term reliability. To maintain safe operation, designers must allocate adequate copper pour and consider thermal vias-especially in high-duty-cycle applications. The SMAJ100AHM3_A/H's RθJA is specified per JEDEC standards and verified in Vishay's characterization data.
How does the unidirectional configuration of SMAJ100AHM3_A/H impact its circuit placement?
The SMAJ100AHM3_A/H is unidirectional, meaning it conducts only when the cathode is at a higher potential than the anode-ideal for DC power line protection where polarity is fixed. The cathode is marked by a band on the SMA package body and must be connected toward the protected line (e.g., VCC), while the anode connects to ground. This polarity prevents unintended conduction during normal operation and ensures precise clamping behavior. Reversing the SMAJ100AHM3_A/H in-circuit would result in forward conduction and failure.
What packaging and moisture sensitivity level does SMAJ100AHM3_A/H have?
SMAJ100AHM3_A/H is supplied in 7" plastic tape-and-reel format (package code H), with 1800 units per reel. It meets MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C-meaning it can undergo standard lead-free reflow soldering without baking or special handling. The device uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and its molding compound satisfies UL 94 V-0 flammability requirements. These attributes make the SMAJ100AHM3_A/H fully compatible with high-volume automated SMT assembly.
SMAJ100AHM3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ100AHM3_A/H FAQ
1.How can I place an order for SMAJ100AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100AHM3_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 SMAJ100AHM3_A/H reliable?
The price and inventory of SMAJ100AHM3_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 SMAJ100AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ100AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100AHM3_A/H?
SMAJ100AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100AHM3_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 SMAJ100AHM3_A/H?
For technical support, including SMAJ100AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ100AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ100AHM3_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 SMAJ100AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ100AHM3_A/H?
All SMAJ100AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100AHM3_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 SMAJ100AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ100AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ100AHM3_A/H Tags
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