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Vishay General Semiconductor - Diodes Division SMA5J12CAHM3_A/H
- Part No.:
- SMA5J12CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J12CAHM3_A/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA5J12CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on signal and power lines. It features a 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage at 25.1 A peak pulse current (IPPM), and 500 W peak pulse power rating with 10/1000 µs waveform - used to safeguard automotive sensor interfaces and industrial I/O circuits against ESD and load dump transients.
For engineers reviewing the SMA5J12CAHM3_A/H datasheet, SMA5J12CAHM3_A/H pinout, SMA5J12CAHM3_A/H application, or SMA5J12CAHM3_A/H equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and verified clamping performance under repetitive surge stress per JESD22-A114.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within <1 ps to transients exceeding its 13.3–14.7 V breakdown range (VBR, min/max at 1 mA). Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and low incremental surge resistance, enabling consistent clamping across temperature (-55 °C to +150 °C).
The SMA5J12CAHM3_A/H is rated for 500 W peak pulse power (10/1000 µs), derated linearly above 25 °C per Fig. 2, and supports unidirectional surge current up to 40 A (8.3 ms half-sine) - though bidirectional operation excludes IFSM use. Thermal resistance is 80 °C/W (junction-to-ambient) on standard 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias margin. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - guaranteed breakdown threshold; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 19.9 V at 25.1 A - clamping voltage under full-rated surge; determines protected circuit's maximum transient exposure. |
| PPPM | 500 W - peak pulse power handling (10/1000 µs); sets energy absorption capability for lightning or inductive switch-off surges. |
| TJ max. | +150 °C - maximum junction temperature; enables reliable operation in under-hood automotive or industrial ambient conditions. |
| Package | SMA (DO-214AC) - surface-mount package with 5.28 mm × 4.50 mm footprint; compatible with automated pick-and-place and reflow soldering. |
| Qualification | AEC-Q101 qualified (HM3 suffix) - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness. |
Pinout & Package
Package: SMA (DO-214AC), bidirectional configuration - no polarity marking; symmetrical terminals with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current in either direction when voltage exceeds VBR magnitude. |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides thermal path to PCB copper pads (recommended 5.0 mm × 5.0 mm per terminal) and mechanical mounting stability. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled or differential signal lines (e.g., CAN, LIN, RS-485) without polarity constraints or external circuitry. |
| AEC-Q101 qualification (HM3) | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces requiring long-term field reliability. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during surge events - critical for protecting 12 V rail-sensitive ICs like microcontrollers and transceivers. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global automotive and industrial OEMs without compromising surge performance. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns - eliminates baking steps in high-volume SMT production. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt TVS diode placed directly at connector entry point to clamp transients before reaching signal conditioning amplifier or ADC input. Use Value: Maintains signal integrity by limiting transient voltage to ≤19.9 V, preventing latch-up or damage to 12 V-tolerant sensor front-ends. |
Use Scenario: Safeguarding 24 V PLC digital input modules against field-wiring induced surges and ground bounce in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional transient suppressor across input terminals to absorb both positive and negative polarity spikes from inductive solenoid switching. Use Value: Enables robust operation without polarity-aware layout - reduces BOM count and simplifies PCB design for dual-polarity industrial signals. |
| Automotive Body Control Module | Telecom Power Line Protection |
Use Scenario: Clamping transients on LIN bus lines connecting door modules, lighting controllers, and seat position sensors in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF at 0 V) bidirectional TVS placed adjacent to LIN transceiver pins to preserve signal rise/fall times. Use Value: Prevents communication errors during ESD discharge (IEC 61000-4-2) while maintaining LIN physical layer timing compliance (≤20 ns propagation delay). |
Use Scenario: Protecting DC power inputs of PoE-powered telecom equipment (e.g., IP cameras, access points) against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converter, rated for repeated 500 W pulses per ITU-T K.20/21 standards. Use Value: Absorbs >95% of 10/1000 µs surge energy before downstream components, extending system MTBF in harsh outdoor deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J12CAHE3_A/H | Same electrical specs and package; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial/industrial use where automotive reliability validation is not required. | Select when cost sensitivity outweighs halogen-free or automotive qualification needs. |
| SMCJ12CAHM3_A/H | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher thermal mass (RθJA = 35 °C/W vs. 80 °C/W). | Better suited for high-repetition-rate surges or elevated ambient temperatures (>85 °C). | Choose when board space allows and thermal derating margins are insufficient with SMA footprint. |
Compared with SMA5J12CAHM3_A/H, SMA5J12CAHE3_A/H offers identical protection performance without halogen-free or AEC-Q101 assurance, while SMCJ12CAHM3_A/H trades compact size for superior thermal dissipation - making the SMA variant optimal for space-constrained automotive modules needing certified reliability.
Availability
SMA5J12CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom power line surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMA5J12CAHM3_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, MOSFETs, and protection devices with emphasis on high-reliability, high-power-density solutions.
The SMA5J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for automotive and industrial transient suppression where AEC-Q101 qualification, bidirectional symmetry, and tight clamping tolerance are mandatory.
FAQ
What does the "HM3" suffix indicate in SMA5J12CAHM3_A/H?
The HM3 suffix in SMA5J12CAHM3_A/H denotes halogen-free, RoHS-compliant construction with full AEC-Q101 qualification - confirming compliance with automotive reliability standards including temperature cycling, highly accelerated life testing (HALT), and ESD immunity per ISO 10605. This distinguishes it from non-automotive variants like SMA5J12CA-E3.
Is SMA5J12CAHM3_A/H suitable for protecting CAN FD bus lines?
SMA5J12CAHM3_A/H is suitable for CAN FD bus protection due to its bidirectional clamping, low clamping voltage (19.9 V), and fast response time (<1 ps), but must be paired with appropriate series impedance (e.g., 10 Ω resistor) to avoid signal distortion. Its typical junction capacitance (<100 pF at 0 V) ensures minimal impact on CAN FD's 5 Mbps timing budget when placed at the connector interface.
How does the clamping voltage of SMA5J12CAHM3_A/H compare to its breakdown voltage?
SMA5J12CAHM3_A/H has a breakdown voltage range of 13.3 V to 14.7 V at 1 mA test current and clamps to 19.9 V at its rated 25.1 A peak pulse current - yielding a clamping ratio of ~1.4. This ratio reflects low incremental surge resistance and ensures protected circuits experience only moderate overvoltage during worst-case transients.
Can SMA5J12CAHM3_A/H be used in parallel to increase surge current handling?
No - SMA5J12CAHM3_A/H should not be paralleled without active current balancing. Minor VBR mismatches between units cause uneven current sharing, risking thermal runaway in one device. For higher IPPM, select a single higher-rated device such as SMCJ12CAHM3_A/H or use a TVS array with matched characteristics.
What is the maximum PCB pad size recommended for thermal performance of SMA5J12CAHM3_A/H?
The datasheet specifies optimal thermal performance for SMA5J12CAHM3_A/H when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Larger pads improve heat dissipation but do not change the rated 500 W PPPM; exceeding this size yields diminishing returns unless internal copper layers are also thermally connected via vias.
SMA5J12CAHM3_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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 25.1A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J12CAHM3_A/H FAQ
1.How can I place an order for SMA5J12CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J12CAHM3_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 SMA5J12CAHM3_A/H reliable?
The price and inventory of SMA5J12CAHM3_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 SMA5J12CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMA5J12CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J12CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J12CAHM3_A/H?
SMA5J12CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J12CAHM3_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 SMA5J12CAHM3_A/H?
For technical support, including SMA5J12CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J12CAHM3_A/H requirements.
6.How does Aetrix verify that SMA5J12CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMA5J12CAHM3_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 SMA5J12CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMA5J12CAHM3_A/H?
All SMA5J12CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J12CAHM3_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 SMA5J12CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMA5J12CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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