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Vishay General Semiconductor - Diodes Division SMAJ100AHM3/H
- Part No.:
- SMAJ100AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100AHM3/H.pdf
- Description:
- TVS DIODE 100VWM 162VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ100AHM3/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 interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ100AHM3/H datasheet, SMAJ100AHM3/H pinout, SMAJ100AHM3/H application, or SMAJ100AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM (100 V) and rapidly transitions to low-impedance conduction above VBR (min 111 V) to limit transient overvoltage. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns).
The device is rated for 400 W peak pulse power (10/1000 μs) up to 78 V, derating to 300 W above 78 V; SMAJ100AHM3/H falls in the latter category. Its thermal resistance is 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), requiring appropriate pad layout per Vishay's recommended 0.2" × 0.2" copper pads for full power rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 100 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 111–123 V at 1 mA - Confirmed minimum/maximum voltage at which device enters avalanche conduction; ensures predictable turn-on. |
| VC (Clamping Voltage) | 162 V at IPPM = 1.9 A - Peak voltage seen by protected circuit during worst-case transient; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 300 W (10/1000 μs) - Sustained transient energy handling capability above 78 V; validated with derated waveform. |
| ID (Reverse Leakage) | 1.0 μA at VWM - Low leakage preserves system efficiency and avoids false triggering in high-impedance circuits. |
| TJ max | 150 °C - Maximum allowable junction temperature; supports operation in under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with cathode band marking; compatible with J-STD-020 MSL Level 1 reflow profile (260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, RoHS-compliant and halogen-free (HM3 suffix), MSL Level 1, 260 °C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection in unidirectional configuration | Connected to protected line; clamps positive transients to ground when anode is grounded. |
| Anode (non-banded end) | Reference/ground node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per JESD22 standards. |
| 400 W / 300 W peak pulse power | Enables protection against ISO 7637-2 pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges without derating in most board-level implementations. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter stability under thermal and electrical stress across 150 °C operation. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage overshoot during fast transients-critical for safeguarding 100 V-rated MOSFETs and gate drivers. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT line integration and inventory management. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump and jump-start transients on 24 V vehicle battery rails feeding ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between battery input and DC-DC converter input stage. Use Value: Limits voltage to ≤162 V during 35 V/100 ms load dump, preventing damage to downstream 36 V-input regulators and microcontrollers. |
Use Scenario: Protecting analog front-end inputs of pressure/temperature sensors connected to PLC I/O modules in factory automation. IC Role / Device Role / Timing Role: Line-side TVS on 24 V sensor supply line, positioned before EMI filter and LDO regulator. Use Value: Clamps induced lightning surges (IEC 61000-4-5, 2 kV) within 1 ns, preserving ±0.1% measurement accuracy of 24-bit ADCs. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Safeguarding PoE-powered network switches and base stations against AC line coupling and EFT bursts on 48 V DC input. IC Role / Device Role / Timing Role: Primary transient suppressor on secondary-side 48 V bus upstream of hot-swap controllers and PMICs. Use Value: Withstands repetitive 400 W pulses at 0.01% duty cycle, enabling compliance with EN 61000-4-4 (4 kV EFT) without thermal runaway. |
Use Scenario: Shielding BLDC motor driver ICs from inductive kickback during commutation in smart HVAC and washing machine inverters. IC Role / Device Role / Timing Role: Parallel-connected TVS across half-bridge leg supply pins (VDD/VSS) to clamp flyback spikes. Use Value: 1.9 A IPPM rating handles typical 1.5 A motor phase currents; 162 V VC prevents gate oxide rupture in 200 V-rated MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ100AHE3/H | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification. | Approved for industrial/commercial use only; not suitable for automotive OEM or Tier-1 production. | Select SMAJ100AHM3/H when halogen-free content and automotive qualification are mandatory per OEM spec. |
| SMBJ100A-HM3 | Same VWM/VBR/VC ratings, but SMB (DO-214AA) package - 2.5 mm wider, higher thermal mass, RθJA = 85 °C/W. | Better power dissipation margin in high-ambient environments; requires larger PCB footprint. | Choose SMBJ100A-HM3 where board space allows and thermal headroom >35 °C above SMAJ100AHM3/H is needed. |
Compared with SMAJ100AHE3/H, SMAJ100AHM3/H adds halogen-free construction and AEC-Q101 validation without sacrificing clamping performance; versus SMBJ100A-HM3, it trades thermal robustness for compact size and lower assembly cost in space-constrained automotive modules.
Availability
SMAJ100AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and telecom infrastructure requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMAJ100AHM3/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, precision, and automotive-grade qualification.
The SMAJ series delivers standardized TVS performance in compact surface-mount packages for board-level ESD and surge protection, targeting cost-sensitive yet mission-critical applications across automotive, industrial, and communications markets.
FAQ
What does the "HM3" suffix indicate in SMAJ100AHM3/H?
The HM3 suffix denotes a halogen-free, RoHS-compliant, commercial-grade version of the SMAJ100A TVS diode, qualified to AEC-Q101 for automotive applications. It specifies matte tin-plated leads, JESD201 Class 2 whisker resistance, and MSL Level 1 handling. The "H" in the full part number SMAJ100AHM3/H refers to the 7-inch tape-and-reel packaging format (1800 units per reel), confirmed in Vishay's ordering information table.
Is SMAJ100AHM3/H suitable for bidirectional transient suppression?
No - SMAJ100AHM3/H is a unidirectional TVS diode, indicated by the "A" (not "CA") suffix and presence of cathode band marking. It conducts only during positive transients relative to its cathode. For bidirectional protection (e.g., data lines or AC-coupled signals), the SMAJ100CA variant must be used; SMAJ100AHM3/H will not clamp negative excursions beyond its forward voltage (~3.5 V at 25 A).
What is the maximum clamping voltage of SMAJ100AHM3/H under standard test conditions?
The maximum clamping voltage (VC) of SMAJ100AHM3/H is 162 V, measured at a peak pulse current (IPPM) of 1.9 A using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range (−55 °C to +150 °C) and defines the upper voltage limit imposed on protected circuitry during surge events.
Does SMAJ100AHM3/H require derating above 25 °C ambient temperature?
Yes - SMAJ100AHM3/H must be derated linearly above TA = 25 °C per Figure 2 in the Vishay datasheet (Doc. #88390). Its 300 W peak pulse power rating applies only at 25 °C; at 85 °C ambient, usable pulse power drops to approximately 210 W. Derating is essential to maintain clamping integrity and avoid thermal runaway during repetitive surge events.
Can SMAJ100AHM3/H be used in place of SMAJ100A-E3/61 on the same PCB?
Yes - SMAJ100AHM3/H shares identical SMA (DO-214AC) package dimensions, pinout, and solder pad layout with SMAJ100A-E3/61. Both use the same 0.2" × 0.2" copper pad recommendation and MSL Level 1 reflow profile. However, SMAJ100AHM3/H adds halogen-free construction and AEC-Q101 qualification, making it a drop-in replacement where those attributes are required - no PCB changes are needed.
SMAJ100AHM3/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:
- 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/H FAQ
1.How can I place an order for SMAJ100AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100AHM3/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/H reliable?
The price and inventory of SMAJ100AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMAJ100AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100AHM3/H?
SMAJ100AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100AHM3/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/H?
For technical support, including SMAJ100AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100AHM3/H requirements.
6.How does Aetrix verify that SMAJ100AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ100AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMAJ100AHM3/H?
All SMAJ100AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100AHM3/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/H part is unused and in its original packaging.
Return procedure for SMAJ100AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ100AHM3/H Tags
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