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Vishay General Semiconductor - Diodes Division SMAJ24AHE3_A/H
- Part No.:
- SMAJ24AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24AHE3_A/H.pdf
- Description:
- TVS DIODE 24VWM 38.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,200
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Product details
Overview
SMAJ24AHE3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 24 V stand-off voltage (VWM), 26.7–29.5 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤38.9 V at 10.3 A peak pulse current (IPPM) under 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ24AHE3_A/H datasheet, SMAJ24AHE3_A/H pinout, SMAJ24AHE3_A/H application, or SMAJ24AHE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, SMA (DO-214AC) surface-mount package, 400 W peak pulse power rating, and low 0.096 %/°C temperature coefficient of VBR, ensuring stable clamping across automotive temperature ranges.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device: during normal operation it presents high impedance above 24 V reverse stand-off, then rapidly avalanches below its 26.7–29.5 V breakdown threshold to limit transient energy. Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, critical for protecting MOSFET gates and microcontroller I/O pins.
The device is rated for 400 W peak pulse power (10/1000 μs), derated to 300 W above 78 V, with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W. Polarity is marked by a cathode band; it meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC bias margin. |
| VBR (min/max) | 26.7 V / 29.5 V at IT = 1 mA - Ensures reliable avalanche initiation within tight tolerance for predictable clamping onset. |
| VC @ IPPM | ≤38.9 V at 10.3 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected IC. |
| PPPM | 400 W - Peak transient energy absorption capability; sufficient for ISO 7637-2 Pulse 1/2a/5a in 12 V automotive systems. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports inrush or fault-current handling in power supply inputs. |
| TJ range | −55 °C to +150 °C - Full automotive-grade junction temperature range; validated per AEC-Q101 stress tests. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMD outline with 5.28 mm × 4.50 mm footprint; compatible with automated placement and IPC-7351B land patterns. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode identified by a single band at one end; anode is the unmarked terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., CAN_H, 12 V rail); conducts surge current to ground when VREV > VBR. |
| Anode (unmarked end) | Reference 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 applications including engine control, body electronics, and ADAS sensors under stress conditions per JESD22-A108. |
| 400 W peak pulse power | Withstands repetitive 10/1000 μs transients up to 400 W on 5.0 mm × 5.0 mm copper pads - meets ISO 16750-2 and SAE J1113-11 requirements. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during clamping; reduces risk of latch-up or gate oxide damage in downstream MOSFETs and logic ICs. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns; eliminates pre-bake requirement in production. |
| 0.096 %/°C VBR tempco | Ensures <±5 % variation in breakdown voltage over −40 °C to +125 °C ambient - critical for consistent protection in under-hood environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs against load dump (ISO 16750-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VIN and GND, responding within <1 ns to limit voltage to ≤38.9 V. Use Value: Prevents permanent damage to LDO regulators and MCU internal circuitry during 35 V/100 ms load dump events. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode to signal, anode to GND) clamps ESD and inductive kickback on field wiring. Use Value: Maintains signal integrity under ±8 kV contact ESD (IEC 61000-4-2) while adding <0.5 pF capacitance to avoid bandwidth degradation. |
| Consumer USB Port ESD Protection | Telecom Ethernet PHY Interface Protection |
Use Scenario: Secondary-level ESD protection on VBUS line of USB 2.0 ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to GND, activated only during overvoltage - no effect on 5 V DC regulation. Use Value: Absorbs ±15 kV air discharge (IEC 61000-4-2) without affecting USB enumeration or data transmission timing. |
Use Scenario: Surge suppression on RJ45 transformer center taps in PoE-powered network switches and IP cameras. IC Role / Device Role / Timing Role: Primary shunt protector on isolated DC bias lines, triggered by lightning-induced surges on Ethernet cabling. Use Value: Limits common-mode transients to <40 V, preserving PHY IC isolation barriers and preventing latch-up in IEEE 802.3af/at circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-E3/61 | Commercial-grade (non-AEC-Q101), same electrical specs and SMA package; RoHS-compliant but not automotive-qualified. | Limited to consumer/industrial use where automotive reliability validation is not required. | Select when cost sensitivity outweighs AEC-Q101 compliance needs and environmental stress testing is not mandated. |
| SMBJ24AHE3_A/H | Same AEC-Q101 qualification and VWM/VBR ratings, but SMB (DO-214AA) package - 5.28 mm × 4.50 mm vs. SMA's 4.50 mm × 2.79 mm; 600 W PPPM. | Higher power handling suits 24 V industrial systems with larger surge margins; requires PCB layout change due to larger footprint. | Choose when higher 600 W surge capacity is needed and board space allows SMB package; not drop-in compatible. |
Compared with SMAJ24AHE3_A/H, SMAJ24A-E3/61 offers identical clamping performance at lower cost but lacks automotive qualification, while SMBJ24AHE3_A/H delivers 50 % higher surge power in a larger package - requiring layout revision but enabling longer surge duration handling in harsher environments.
Availability
SMAJ24AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power-over-Ethernet equipment requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SMAJ24AHE3_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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered specifically for high-reliability transient suppression in automotive and industrial environments, balancing compact size, precise clamping, and rigorous qualification to AEC-Q101 standards.
FAQ
What is the clamping voltage of SMAJ24AHE3_A/H at its rated peak pulse current?
The SMAJ24AHE3_A/H clamps to a maximum of 38.9 V at its specified peak pulse current of 10.3 A under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and ensures downstream components see limited overvoltage stress during transient events. The clamping voltage is guaranteed across the full operating temperature range and forms the basis for safe margin design in protected circuits using SMAJ24AHE3_A/H.
Is SMAJ24AHE3_A/H suitable for bidirectional transient protection?
No, SMAJ24AHE3_A/H is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse bias above VBR; forward conduction is limited to ~3.5 V at 25 A. For bidirectional protection, the "CA" variant (e.g., SMAJ24CAHE3_A/H) must be used. Using SMAJ24AHE3_A/H in AC-coupled or symmetrical signal paths risks forward conduction failure or inadequate protection during negative transients.
Does SMAJ24AHE3_A/H require derating above 25 °C ambient temperature?
Yes, SMAJ24AHE3_A/H must be derated above 25 °C ambient per Figure 2 in the Vishay datasheet (Document Number: 88390). Its peak pulse power drops linearly from 400 W at 25 °C to zero at approximately 150 °C junction temperature. Derating is governed by RθJA = 120 °C/W and mounting pad thermal mass; for sustained operation, ensure PCB copper area and airflow maintain TJ < 150 °C during surge events. SMAJ24AHE3_A/H datasheet provides exact derating curves.
What does the "HE3_A/H" suffix signify in SMAJ24AHE3_A/H?
The "HE3" denotes RoHS-compliant and AEC-Q101 qualified construction; "A" indicates tape-and-reel packaging per EIA-481 standard; "H" specifies the 7-inch reel size containing 1800 units. This full suffix confirms SMAJ24AHE3_A/H meets automotive reliability standards, uses lead-free terminations, and ships in industry-standard automated assembly format - essential for Tier 1 automotive production lines requiring full traceability and process compatibility.
How does the temperature coefficient of VBR affect SMAJ24AHE3_A/H performance in automotive under-hood applications?
The SMAJ24AHE3_A/H has a VBR temperature coefficient of +0.096 %/°C, meaning its breakdown voltage increases predictably with junction temperature. Over the −40 °C to +125 °C automotive range, VBR shifts by <±5 %, ensuring consistent clamping onset without premature triggering or delayed response. This stability is critical for SMAJ24AHE3_A/H deployment in engine control modules where ambient extremes directly impact protection timing and reliability.
SMAJ24AHE3_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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ24AHE3_A/H FAQ
1.How can I place an order for SMAJ24AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24AHE3_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 SMAJ24AHE3_A/H reliable?
The price and inventory of SMAJ24AHE3_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 SMAJ24AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ24AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24AHE3_A/H?
SMAJ24AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24AHE3_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 SMAJ24AHE3_A/H?
For technical support, including SMAJ24AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ24AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ24AHE3_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 SMAJ24AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ24AHE3_A/H?
All SMAJ24AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24AHE3_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 SMAJ24AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ24AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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