My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ15AHM3/H
- Part No.:
- SMAJ15AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15AHM3/H.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,022
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ15AHM3/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 15 V stand-off voltage (VWM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA, 24.4 V maximum clamping voltage (VC) at 16.4 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - optimized for automotive-grade ESD and load-dump surge suppression.
For engineers reviewing the SMAJ15AHM3/H datasheet, SMAJ15AHM3/H pinout, SMAJ15AHM3/H application, or SMAJ15AHM3/H equivalent, this device is selected for high-reliability transient protection where AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.46), and halogen-free RoHS compliance are mandatory in automotive infotainment, body control modules, and ADAS sensor interfaces.
Technical Context
The SMAJ15AHM3/H operates as a unidirectional avalanche diode with cathode-band polarity marking, leveraging glass-passivated junction technology for stable breakdown and fast response (<1 ps). Its thermal resistance (RθJA = 120 °C/W) and junction temperature range (–55 to +150 °C) support operation in under-hood environments without forced cooling.
It delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, per Fig. 2 of the datasheet. The device meets MSL Level 1 per J-STD-020 and passes JESD 201 Class 2 whisker testing - confirming suitability for lead-free reflow assembly in high-volume automotive production.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC rail margin for 12 V automotive systems. |
| VBR (min/max) | 16.7 V / 18.5 V at IT = 1 mA - Tight breakdown window ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 24.4 V at 16.4 A - Clamps induced surges to a safe level for downstream 3.3 V/5 V logic and CAN transceivers. |
| PPPM | 400 W (10/1000 μs) - Withstands ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 3a/b (line dump) waveforms. |
| IFSM | 40 A (8.3 ms half-sine) - Handles repetitive load-dump events without bond-wire fusing. |
| Junction Temp | –55 °C to +150 °C - Enables placement near heat sources (e.g., power MOSFETs) in engine control units. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated pick-and-place; 0.208" × 0.157" body size fits tight PCB layouts. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads solderable per J-STD-002. Cathode identified by black band on one end; anode is unmarked opposite terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., 12 V rail); conducts surge current to ground when VIN > VBR. |
| Anode (unbanded 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 use per stress test requirements - eliminates need for additional qualification in Tier-1 BOMs. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU ELV Directive and OEM material declarations; supports green manufacturing and export compliance. |
| 400 W peak pulse power (≤78 V) | Provides margin against ISO 16750-2 load-dump spikes up to 35 V for 400 ms without degradation. |
| Low clamping ratio (VC/VBR = 1.46) | Minimizes voltage overshoot across protected ICs - critical for safeguarding 24 V-rated CAN FD transceivers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protects microcontroller GPIOs and LIN bus transceivers from relay coil flyback and battery reverse-connection transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V supply rail and ground, clamping surges within 1 ns. Use Value: Prevents latch-up and gate oxide damage in 3.3 V MCU I/O cells during 100 V/500 ms load-dump events. |
Use Scenario: Shields 24 V digital input channels from field-wiring ESD and inductive kickback in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff protection element mounted directly at connector entry point, shunting transients before optocoupler inputs. Use Value: Maintains <1 μA leakage at 24 V nominal, ensuring reliable logic-level detection while surviving ±2 kV contact ESD per IEC 61000-4-2. |
| Automotive Infotainment Power Supply | ADAS Camera Sensor Interface |
|
Use Scenario: Guards USB-C PD controller and display power sequencing circuitry against alternator ripple and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 5 V/9 V/15 V buck converter outputs feeding SoC subsystems. Use Value: Limits output overshoot to ≤24.4 V during 400 W transient events, preventing brownout resets and flash memory corruption. |
Use Scenario: Protects FPD-Link III serializer inputs from cable discharge events and hot-plug transients in rear-view camera modules. IC Role / Device Role / Timing Role: Low-capacitance (CJ < 100 pF at VR = 0 V) TVS placed inline with differential video pairs. Use Value: Adds <0.5 pF parasitic capacitance per line - preserves signal integrity up to 3 Gbps without equalization penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15AHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable for non-green automotive programs where halogen content is unrestricted. | Select SMAJ15AHE3/H if halogen-free requirement is waived and cost optimization is prioritized. |
| SMBJ15A-HM3 | Same VWM/VC, but SMB package (DO-214AA) offers higher PPPM = 600 W and lower RθJA = 80 °C/W. | Better suited for high-energy transients in engine control units where board space allows larger footprint. | Choose SMBJ15A-HM3 when surge energy exceeds 400 W or thermal management requires lower junction rise. |
Compared with SMAJ15AHM3/H, SMAJ15AHE3/H trades halogen-free status for identical performance and qualification, while SMBJ15A-HM3 upgrades package and power handling at the cost of 30 % larger PCB area - enabling design flexibility across cost, environmental, and ruggedness tiers.
Availability
SMAJ15AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and ADAS sensor modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ15AHM3/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 high-reliability diodes, MOSFETs, and passive components for automotive, industrial, and computing markets.
The SMAJ series is engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing low clamping, fast response, and process-controlled consistency across voltage grades.
FAQ
What is the maximum clamping voltage of the SMAJ15AHM3/H under standard test conditions?
The SMAJ15AHM3/H has a maximum clamping voltage (VC) of 24.4 V when subjected to its rated peak pulse current (IPPM) of 16.4 A using a 10/1000 μs waveform. This value is measured at TA = 25 °C and ensures downstream ICs remain within safe operating voltage limits during transient events. The SMAJ15AHM3/H achieves this with a clamping ratio of approximately 1.46 relative to its minimum breakdown voltage.
Is the SMAJ15AHM3/H qualified for automotive applications?
Yes, the SMAJ15AHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet revision 09-Jan-2024. This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - making the SMAJ15AHM3/H suitable for under-hood and cabin-mounted automotive ECUs without additional qualification effort.
How does the HM3 suffix differ from the HE3 suffix in the SMAJ15A family?
The HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction, whereas HE3 indicates RoHS-compliant and AEC-Q101-qualified but not halogen-free. Both share identical electrical specifications and thermal ratings, but SMAJ15AHM3/H meets stricter material compliance mandates for OEMs requiring halogen-free bill-of-materials - such as those aligned with VW 80101 or GMW17808 standards.
What is the thermal resistance of the SMAJ15AHM3/H, and how does it affect layout design?
The SMAJ15AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes minimal PCB copper; designers should allocate ≥5 mm² of 2-oz copper pour per pad to maintain junction temperature below 150 °C during repetitive surge events. The SMAJ15AHM3/H's RθJL of 30 °C/W further supports thermal coupling to internal ground planes via short, wide traces.
Can the SMAJ15AHM3/H be used in bidirectional protection circuits?
No - the SMAJ15AHM3/H is a unidirectional TVS diode, indicated by the "A" (not "CA") suffix and cathode band marking. For bidirectional protection, Vishay specifies parts like SMAJ15CA. Using SMAJ15AHM3/H in reverse-biased configurations risks permanent breakdown due to lack of symmetrical avalanche structure; always verify polarity alignment in schematic and layout to ensure the cathode connects to the protected line.
SMAJ15AHM3/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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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)
SMAJ15AHM3/H FAQ
1.How can I place an order for SMAJ15AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15AHM3/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 SMAJ15AHM3/H reliable?
The price and inventory of SMAJ15AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ15AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15AHM3/H?
SMAJ15AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15AHM3/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 SMAJ15AHM3/H?
For technical support, including SMAJ15AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15AHM3/H requirements.
6.How does Aetrix verify that SMAJ15AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ15AHM3/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 SMAJ15AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ15AHM3/H?
All SMAJ15AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15AHM3/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 SMAJ15AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ15AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ15AHM3/H Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
