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Vishay General Semiconductor - Diodes Division SMAJ100CAHM3_A/I
- Part No.:
- SMAJ100CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ100CAHM3_A/I.pdf
- Description:
- TVS DIODE 100VWM 162VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ100CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features 100 V standoff voltage (VWM), 162 V maximum clamping voltage (VC) at 1.9 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ100CAHM3_A/I datasheet, SMAJ100CAHM3_A/I pinout, SMAJ100CAHM3_A/I application, or SMAJ100CAHM3_A/I equivalent, key selection criteria include bidirectional surge clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ps) and low incremental surge resistance, critical for suppressing ESD and lightning-induced transients per IEC 61000-4-2 and ISO 7637-2.
The SMAJ100CAHM3_A/I is rated for -55 °C to +150 °C operating junction temperature, supports 40 A non-repetitive forward surge current (IFSM), and meets MSL Level 1 per J-STD-020 with peak reflow temperature of 260 °C - confirming suitability for high-reliability automotive electronics where thermal cycling and long-term stability are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 12 V–48 V DC bus protection. |
| VC @ IPPM | 162 V at 1.9 A - clamped voltage during 10/1000 μs transient; ensures downstream ICs see <162 V under worst-case surge. |
| PPPM | 400 W - peak pulse power handling with 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1/2a/5a automotive load dump suppression. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments without derating. |
| RθJA | 120 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for sustained surge duty. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with JEDEC-standard pick-and-place. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity unmarked for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (reverse bias) | One terminal of symmetrical PN junction; accepts surge current in either direction during overvoltage events. |
| Cathode | Transient current exit (reverse bias) | Second terminal of symmetrical PN junction; completes low-impedance path to ground or rail during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns - e.g., CAN bus or RS-485 differential pairs. |
| 400 W peak pulse power | Supports robust immunity against ISO 7637-2 Load Dump (Pulse 5a) up to 120 V test level on 12 V systems with minimal PCB area. |
| AEC-Q101 qualified (HM3 suffix) | Confirms compliance with automotive stress tests including HTGB, TC, and uHAST - required for engine control, ADAS, and body electronics. |
| MSL Level 1 rating | Permits unlimited floor life and single-reflow processing at 260 °C peak, eliminating moisture sensitivity handling for high-volume SMT lines. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage stress on protected devices compared to alternatives with higher ratios - improves system-level surge margin. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply rails in engine control units (ECUs) against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between power rail and chassis ground to shunt surge energy away from MCU and power management ICs. Use Value: Limits transient voltage to ≤162 V during ISO 7637-2 Pulse 5a (120 V/350 ms), preventing latch-up or gate oxide damage in protected semiconductors. |
Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in PLC modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential signal pair or single-ended input to suppress EFT and surge coupling. Use Value: Maintains signal integrity by clamping ±162 V surges within nanoseconds while adding <1 pF parasitic capacitance - no bandwidth degradation. |
| Telecom Data Line Surge Suppression | Consumer Device USB Port Protection |
|
Use Scenario: Shielding RS-232/RS-485 transceivers in base station backhaul equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary line-side TVS connected between signal line and ground, operating in bidirectional mode to handle polarity-agnostic transients. Use Value: Withstands 400 W peak pulses without degradation, enabling compliance with ITU-T K.21 basic protection level for telecom infrastructure. |
Use Scenario: Adding secondary-level surge protection on USB VBUS and D+/D− lines in smart home hubs subject to user-handling ESD. IC Role / Device Role / Timing Role: Fast-response clamping diode placed after primary fuse and upstream of USB controller IC to limit voltage overshoot. Use Value: Achieves <1 ns response time and 162 V clamping to keep USB PHY voltage within ±20% of 5 V nominal - prevents enumeration failure or port lockup. |
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_A/I | Same electrical specs but RoHS-compliant commercial grade (non-AEC-Q101); lacks automotive qualification testing. | Approved for industrial/commercial use only; not suitable for automotive OEM or Tier-1 production programs. | Select when cost-sensitive non-automotive designs require identical clamping performance without AEC validation. |
| SMBJ100CAHM3_A/I | Same VWM/VC/PPPM but in larger SMB (DO-214AA) package; RθJA = 80 °C/W vs. 120 °C/W for SMAJ. | Better thermal performance allows higher repetitive surge duty; requires 25% more PCB area than SMAJ footprint. | Choose when board layout permits larger package and thermal management demands lower junction rise per watt. |
Compared with SMAJ100CAHE3_A/I, the SMAJ100CAHM3_A/I adds AEC-Q101 qualification for automotive deployment; versus SMBJ100CAHM3_A/I, it trades thermal efficiency for space-constrained layouts - making SMAJ100CAHM3_A/I optimal for compact, qualified automotive modules.
Availability
SMAJ100CAHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom data line interfaces, and consumer USB power delivery systems requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ100CAHM3_A/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, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMAJ series was developed specifically for high-speed transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ100CAHM3_A/I under a 10/1000 μs surge?
The SMAJ100CAHM3_A/I has a maximum clamping voltage (VC) of 162 V at 1.9 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ100CAHM3_A/I maintains this clamping performance across its full operating temperature range.
Is the SMAJ100CAHM3_A/I suitable for automotive applications?
Yes, the SMAJ100CAHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and unbiased highly accelerated stress testing - making SMAJ100CAHM3_A/I appropriate for engine control, body electronics, and ADAS subsystems per automotive OEM requirements.
What does the "CA" suffix mean in SMAJ100CAHM3_A/I?
The "CA" suffix in SMAJ100CAHM3_A/I designates a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression in both polarities - unlike unidirectional "A" variants that clamp only in reverse bias. This enables SMAJ100CAHM3_A/I to protect AC-coupled signals, floating buses, or dual-rail systems without regard to voltage polarity during surge events.
What is the thermal resistance of the SMAJ100CAHM3_A/I, and how does it affect layout?
The SMAJ100CAHM3_A/I 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 assumes minimum recommended pad layout per Vishay's DO-214AC footprint; reducing pad size or omitting thermal vias increases junction temperature. For sustained surge duty, designers should verify thermal margin using SMAJ100CAHM3_A/I's 3.3 W steady-state power dissipation rating.
How does the SMAJ100CAHM3_A/I compare to unidirectional SMAJ100AHM3_A/I in circuit implementation?
The SMAJ100CAHM3_A/I differs from the unidirectional SMAJ100AHM3_A/I solely in polarity configuration: SMAJ100CAHM3_A/I clamps symmetrically in both directions and carries no cathode band marking, whereas SMAJ100AHM3_A/I has a visible cathode band and clamps only in reverse bias. Circuit-wise, SMAJ100CAHM3_A/I replaces two unidirectional devices in AC or floating applications - simplifying layout and reducing BOM count without sacrificing protection level.
SMAJ100CAHM3_A/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:
- Active
- 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_A/I FAQ
1.How can I place an order for SMAJ100CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ100CAHM3_A/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 SMAJ100CAHM3_A/I reliable?
The price and inventory of SMAJ100CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ100CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ100CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ100CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ100CAHM3_A/I?
SMAJ100CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ100CAHM3_A/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 SMAJ100CAHM3_A/I?
For technical support, including SMAJ100CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ100CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ100CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ100CAHM3_A/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 SMAJ100CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ100CAHM3_A/I?
All SMAJ100CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ100CAHM3_A/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 SMAJ100CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ100CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ100CAHM3_A/I Tags
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