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Vishay General Semiconductor - Diodes Division SMAJ24CAHM3/I
- Part No.:
- SMAJ24CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CAHM3/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
SMAJ24CAHM3/I 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 24 V stand-off voltage (VWM), 38.9 V maximum clamping voltage (VC) at 10.3 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), making it suitable for automotive sensor line protection and industrial I/O interface surge suppression.
For engineers reviewing the SMAJ24CAHM3/I datasheet, SMAJ24CAHM3/I pinout, SMAJ24CAHM3/I application, or SMAJ24CAHM3/I equivalent, key selection criteria include bidirectional clamping behavior, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), and halogen-free RoHS compliance per Vishay HM3 suffix designation.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 μA leakage at 24 V), but triggers into low-impedance conduction when transients exceed its 26.7–29.5 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche characteristics and fast response (<1 ns).
The SMAJ24CAHM3/I is rated for repetitive 10/1000 μs surges up to 400 W below 78 V (derated to 300 W above), with maximum junction temperature of +150 °C and MSL Level 1 moisture sensitivity - enabling standard reflow assembly without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 26.7 V / 29.5 V at 1 mA - Confirmed breakdown threshold range defining turn-on precision |
| VC @ IPPM | 38.9 V at 10.3 A - Clamped voltage during worst-case 400 W transient, limiting downstream stress |
| PPPM | 400 W (10/1000 μs) - Peak surge energy handling capacity for automotive load-dump and ESD events |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms), supporting inductive switch-off protection |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified (HM3 suffix). Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); matte tin-plated leads, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | Bidirectional symmetry: no polarity marking; either terminal serves as anode or cathode depending on transient polarity |
| Cathode | Terminal K | Same physical terminal as Anode - bidirectional construction eliminates functional distinction between terminals |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and supports lead-free reflow without compromising reliability |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 surge waveforms in industrial systems |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes protected circuit overvoltage margin, enabling tighter design margins for 24 V rail systems |
| MSL Level 1, peak reflow 260 °C | Compatible with standard SMT assembly lines without pre-baking or special handling |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and jump-start transients in 24 V vehicle architectures. IC Role / Device Role / Timing Role: Bidirectional shunt TVS placed directly at connector entry point to clamp ±30 V transients before reaching signal conditioning ICs. Use Value: Maintains signal integrity by limiting clamped voltage to 38.9 V while absorbing 400 W surges - preventing latch-up or damage to 3.3 V/5 V interface ICs downstream. | Use Scenario: Safeguarding digital input modules in programmable logic controllers against induced surges from nearby motor contactors or solenoid switching. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V DC input lines, operating in parallel with optocoupler input stages to divert fast-rising transients. Use Value: Enables reliable operation in harsh factory environments where >1 kV surges occur; 150 °C max junction temperature supports sealed enclosure use without derating. |
| Telecom Power Interface | Consumer Appliance Motor Control |
Use Scenario: Surge protection on 24 V auxiliary power rails feeding remote radio units and base station backhaul interfaces. IC Role / Device Role / Timing Role: Primary front-end protector on DC input, coordinated with secondary MOV or GDT for multi-stage defense per IEC 61000-4-5 Level 4. Use Value: Provides precise 24 V standoff and low clamping to avoid false triggering of undervoltage lockout in power management ICs. | Use Scenario: Overvoltage suppression on brushed DC motor driver PCBs in washing machines and HVAC blowers subjected to commutation spikes. IC Role / Device Role / Timing Role: Bidirectional TVS across motor terminals and H-bridge supply rails to absorb inductive kickback during PWM switching. Use Value: Prevents gate oxide failure in MOSFET drivers by clamping transients to ≤38.9 V, extending field lifetime in cost-sensitive white goods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CAHE3/I | Same electrical specs, RoHS-compliant but not halogen-free; lacks HM3 environmental certification | Acceptable for commercial/industrial use where halogen-free requirement is not mandated | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and assembly process |
| SMBJ24CAHM3/I | Same VWM/VC, but SMB package (DO-214AA) offers higher 600 W PPPM rating and lower RθJA (90 °C/W) | Better suited for higher-energy surge environments (e.g., outdoor telecom, heavy industrial) | Choose when system-level surge testing exceeds 400 W; requires PCB layout change due to larger SMB footprint |
Compared with SMAJ24CAHE3/I, the SMAJ24CAHM3/I adds halogen-free compliance without sacrificing performance; versus SMBJ24CAHM3/I, it trades 200 W pulse power headroom for smaller board area and lower profile - ideal for space-constrained automotive modules.
Availability
SMAJ24CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom power supplies requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMAJ24CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, automotive qualification, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, AEC-Q101 validation, and surface-mount manufacturability are critical.
FAQ
What does the "HM3" suffix mean in SMAJ24CAHM3/I?
The "HM3" suffix in SMAJ24CAHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with JEDEC J-STD-020 MSL Level 1, matte tin plating per J-STD-002, and whisker resistance per JESD 201 Class 2 - essential for automotive and high-reliability industrial use.
Is SMAJ24CAHM3/I unidirectional or bidirectional?
SMAJ24CAHM3/I is a bidirectional TVS diode, as confirmed by the "CA" suffix and documented electrical characteristics applying equally in both directions. It has no polarity marking on the SMA package and provides symmetrical clamping for positive and negative transients - unlike unidirectional "A" variants which feature a cathode band.
What is the maximum clamping voltage of SMAJ24CAHM3/I and at what current?
The maximum clamping voltage (VC) of SMAJ24CAHM3/I is 38.9 V, measured at the peak pulse current (IPPM) of 10.3 A under a 10/1000 μs waveform. This value is guaranteed per Vishay's datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuits during surge events.
Can SMAJ24CAHM3/I replace SMAJ24A in a design?
No - SMAJ24CAHM3/I is bidirectional while SMAJ24A is unidirectional, so direct replacement requires circuit review. SMAJ24A has a cathode band and conducts only in reverse bias; substituting SMAJ24CAHM3/I would eliminate polarity dependence but may alter leakage paths or grounding schemes in DC-coupled applications.
Does SMAJ24CAHM3/I meet automotive qualification standards?
Yes, SMAJ24CAHM3/I is AEC-Q101 qualified, as explicitly stated in Vishay's ordering information and thermal characteristics notes. This qualification covers stress tests including HTGB, HTRB, TCT, and mechanical shock - validating its suitability for automotive powertrain, chassis, and body electronics applications.
SMAJ24CAHM3/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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- 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)
SMAJ24CAHM3/I FAQ
1.How can I place an order for SMAJ24CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CAHM3/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 SMAJ24CAHM3/I reliable?
The price and inventory of SMAJ24CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ24CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CAHM3/I?
SMAJ24CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CAHM3/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 SMAJ24CAHM3/I?
For technical support, including SMAJ24CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CAHM3/I requirements.
6.How does Aetrix verify that SMAJ24CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ24CAHM3/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 SMAJ24CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ24CAHM3/I?
All SMAJ24CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CAHM3/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 SMAJ24CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ24CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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