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Vishay General Semiconductor - Diodes Division SMAJ24AHM3_A/I
- Part No.:
- SMAJ24AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24AHM3_A/I.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,013
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Product details
Overview
SMAJ24AHM3_A/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 24 V standoff voltage (VWM), 26.7–29.5 V breakdown voltage (VBR) at 1 mA, 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), commonly deployed on DC power rails and I/O lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ24AHM3_A/I datasheet, SMAJ24AHM3_A/I pinout, SMAJ24AHM3_A/I application, or SMAJ24AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low thermal resistance (RθJL = 30 °C/W), and verified clamping performance under repetitive surge conditions per IEC 61000-4-5.
Technical Context
This TVS diode operates as a unidirectional shunt protector, leveraging an avalanche breakdown mechanism to clamp transient voltages above its VBR threshold while maintaining low leakage (<1.0 μA at 24 V). Its glass-passivated junction ensures stable parametric behavior across temperature (−55 °C to +150 °C) and long-term reliability under repeated surge stress.
The device is optimized for surface-mount automated assembly and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak. Its SMA package provides mechanical robustness and thermal dissipation suitable for PCB layouts with 0.2" × 0.2" copper pads per terminal, enabling effective heat transfer during 400 W transient events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 24 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail operating margin. |
| VBR (Breakdown Voltage) | 26.7–29.5 V at 1 mA - Guaranteed avalanche initiation range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 38.9 V at IPPM = 10.3 A - Peak voltage seen by protected circuit during 400 W surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Surge energy handling capacity; validated with 0.01 % duty cycle per JEDEC standards. |
| ID (Reverse Leakage) | ≤1.0 μA at 24 V - Minimal standby power loss and signal integrity impact on high-impedance nodes. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive environments. |
| RθJL | 30 °C/W - Junction-to-lead thermal resistance; enables direct PCB copper pad cooling without heatsink. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-ended unidirectional configuration with cathode band marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or common return path; forms current sink during clamping event. |
| Cathode | Protected line input | Connected to line being protected (e.g., 24 V supply rail); polarity band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance per stress test plan. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental compliance requirements without compromising surge robustness or thermal performance. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V systems with margin. |
| Fast response time (<1 ps) | Clamps transients before downstream ICs experience damaging overvoltage-critical for protecting CAN transceivers and microcontrollers. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning or baking. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 24 V supply rail and LIN bus interface against load dump and inductive switching spikes in vehicle body electronics. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VBAT and GND, clamping transients within 100 ns. Use Value: Enables compliance with ISO 7637-2 Pulse 5a (load dump) up to 35 V, preserving MCU and driver IC lifetime. |
Use Scenario: Shields 24 V digital input channels from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end protection element on optocoupler input side, absorbing 1 kV/500 Ω transients. Use Value: Maintains <1 μA leakage at 24 V, preventing false triggering of input logic while surviving >100,000 surge events. |
| Telecom Remote Radio Unit (RRU) | Medical Infusion Pump Power Stage |
Use Scenario: Guards 24 V auxiliary power input of outdoor RRU against lightning-induced surges on PoE-derived feeds. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converter, rated for 400 W repetitive surges. Use Value: Limits clamped voltage to 38.9 V, ensuring downstream buck controller remains below absolute maximum ratings. |
Use Scenario: Safeguards motor driver FET gate drive lines and microcontroller I/O from ESD and relay coil kickback in battery-powered pumps. IC Role / Device Role / Timing Role: Localized protection on 24 V motor supply rail and isolated sensor analog inputs. Use Value: Halogen-free HM3 construction satisfies IEC 60601-1 material safety requirements without derating surge capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHE3_A/I | Same electrical specs, but RoHS-compliant (E3) without halogen-free certification; higher ID (≤1.0 μA vs. ≤1.0 μA - identical), same VBR/VC. | Approved for commercial/industrial use where halogen-free mandate is not enforced (e.g., non-automotive consumer gear). | Select when halogen-free requirement is absent and cost optimization is prioritized over automotive compliance. |
| SMAJ24A-M3/5A | Identical electrical parameters and HM3 halogen-free spec, but supplied in 13" tape-and-reel (7500 pcs) vs. I-pack (7500 pcs); same MSL Level 1 rating. | Designed for high-volume SMT production lines requiring large reels; no functional difference in protection performance. | Choose for automated placement systems using 13" reels; no design or reliability trade-offs versus SMAJ24AHM3_A/I. |
Compared with SMAJ24AHE3_A/I, SMAJ24AHM3_A/I adds halogen-free assurance for automotive AEC-Q101 programs; compared with SMAJ24A-M3/5A, it uses identical HM3 material but differs only in packaging format-not electrical behavior or qualification scope.
Availability
SMAJ24AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and medical infusion pump designs requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMAJ24AHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom infrastructure where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMAJ24AHM3_A/I at its rated peak pulse current?
The SMAJ24AHM3_A/I has a maximum clamping voltage (VC) of 38.9 V at 10.3 A peak pulse current (IPPM), measured under the standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuits during surge events and is critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMAJ24AHM3_A/I maintains this clamping performance across its full operating temperature range (−55 °C to +150 °C).
Is SMAJ24AHM3_A/I qualified for automotive applications?
Yes, SMAJ24AHM3_A/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. This qualification covers stress tests including temperature cycling, high-temperature operating life, and surge endurance-making it suitable for under-hood and body electronics in passenger vehicles and commercial vehicles. The SMAJ24AHM3_A/I meets all requirements for use in automotive power distribution modules and sensor interface circuits.
What does the "HM3" suffix indicate in SMAJ24AHM3_A/I?
The "HM3" suffix in SMAJ24AHM3_A/I denotes halogen-free, RoHS-compliant construction per Vishay's material categorization system. It confirms the molding compound contains no brominated or chlorinated flame retardants, satisfying strict environmental mandates such as EU RoHS Directive 2011/65/EU Annex II and automotive OEM substance restrictions. This designation is distinct from "E3" (RoHS only) and is required for many Tier 1 automotive programs.
How does SMAJ24AHM3_A/I differ from bidirectional SMAJ24CA variants?
SMAJ24AHM3_A/I is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse voltage is blocked. In contrast, SMAJ24CA is bidirectional, symmetrical in both directions, and used for AC or data-line protection (e.g., RS-485). Their VBR, VC, and PPPM values differ: SMAJ24CA has higher VBR (min 26.7 V, max 29.5 V same), but clamps at 38.9 V only in one direction-bidirectional clamping is specified separately and typically higher. SMAJ24AHM3_A/I must not be substituted for SMAJ24CA without circuit review.
What is the thermal resistance from junction to lead (RθJL) for SMAJ24AHM3_A/I?
The SMAJ24AHM3_A/I has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W, as specified in Vishay's thermal characteristics table. This parameter quantifies how effectively heat generated during surge events transfers from the silicon die to the PCB copper pads via the leads. Combined with its SMA package footprint and recommended 0.2" × 0.2" copper pads, this RθJL enables reliable operation at full 400 W pulse power without external heatsinking-critical for space-constrained automotive and industrial PCB layouts.
SMAJ24AHM3_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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ24AHM3_A/I FAQ
1.How can I place an order for SMAJ24AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24AHM3_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 SMAJ24AHM3_A/I reliable?
The price and inventory of SMAJ24AHM3_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 SMAJ24AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ24AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24AHM3_A/I?
SMAJ24AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24AHM3_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 SMAJ24AHM3_A/I?
For technical support, including SMAJ24AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ24AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ24AHM3_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 SMAJ24AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ24AHM3_A/I?
All SMAJ24AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24AHM3_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 SMAJ24AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ24AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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