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Vishay General Semiconductor - Diodes Division SMA5J20CAHM3_A/H
- Part No.:
- SMA5J20CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J20CAHM3_A/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,462
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Product details
Overview
SMA5J20CAHM3_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 20 V standoff voltage (VWM), 22.2–24.5 V breakdown voltage (VBR), 32.4 V clamping voltage at 15.4 A peak pulse current (IPPM), and 500 W peak pulse power (PPPM) with 10/1000 μs waveform - used to protect automotive sensor interfaces and industrial I/O circuits against ESD and load dump transients.
For engineers reviewing the SMA5J20CAHM3_A/H datasheet, SMA5J20CAHM3_A/H pinout, SMA5J20CAHM3_A/H application, or SMA5J20CAHM3_A/H equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), thermal resistance (RθJA = 80 °C/W), and clamping performance under repetitive surge stress.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients exceeding its VWM. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 20 V), while the bidirectional architecture enables symmetrical clamping on AC-coupled or differential lines without polarity constraints.
The device is rated for -55 °C to +150 °C operating junction temperature and meets JESD201 Class 2 whisker resistance. Its MSL Level 1 rating (peak reflow ≤260 °C) supports standard SMT assembly, and the SMA package provides mechanical robustness with UL 94 V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR min/max | 22.2 V / 24.5 V at 1 mA - guaranteed breakdown threshold range ensuring consistent turn-on across production lots. |
| VC @ IPPM | 32.4 V at 15.4 A - clamping voltage during 10/1000 μs surge; limits downstream voltage stress to protected ICs. |
| PPPM | 500 W - peak pulse power handling capacity; determines survivability against ISO 7637-2 Pulse 1/2/5a surges. |
| TJ max | +150 °C - maximum junction temperature; enables use in under-hood automotive environments with minimal derating. |
| RθJA | 80 °C/W - thermal resistance junction-to-ambient on standard 5 mm × 5 mm copper pads; informs PCB thermal layout requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both terminals) | Surge current path | Identical bidirectional conduction; either terminal serves as input or return path depending on transient polarity. |
| Case (body) | Thermal interface | Non-electrical; transfers heat to PCB copper via soldered leads; requires minimum 5 mm × 5 mm pad per terminal per datasheet fig. 2. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and eliminates corrosive halogen emissions during board rework or end-of-life processing. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.45) versus legacy TVS devices, reducing voltage overshoot on fast-rising transients. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow without popcorn cracking or parameter shift; eliminates pre-bake requirement. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD and LIN bus transceivers from load dump and jump-start transients in vehicle body control modules. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and ground, absorbing energy before it reaches the transceiver's ESD structure. Use Value: Maintains signal integrity during 12 V system surges up to 500 W without latch-up or degradation over >1000 surge events. |
Use Scenario: Safeguarding analog input channels (0–10 V, 4–20 mA) in programmable logic controllers exposed to field wiring inductive kickback. IC Role / Device Role / Timing Role: Fast-response voltage limiter across input terminals, triggered within <1 ns to clamp transients before ADC front-end damage. Use Value: Enables reliable operation in harsh factory environments where 1 kV/μs transients occur due to relay switching and motor drives. |
| Telecom Power Rail Protection | Consumer USB Interface Protection |
Use Scenario: Guarding 24 V DC power inputs of PoE-powered network switches against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on main supply rail, coordinated with upstream fuses and secondary regulators. Use Value: Withstands repeated 500 W surges without parametric drift, preserving long-term reliability in unattended infrastructure equipment. |
Use Scenario: ESD and cable discharge event (CDE) protection on USB 2.0 data lines (D+/D−) in portable media players and docking stations. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (CJ ≈ 100 pF at 0 V) placed directly at connector to minimize stub length. Use Value: Prevents USB enumeration failure and PHY damage from ±15 kV contact ESD per IEC 61000-4-2, with no signal integrity impact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J20CAHE3_A/H | Same electrical specs and package; RoHS-compliant but not halogen-free (E3 vs HM3). | Lacks halogen-free certification; acceptable for commercial-grade but not automotive Tier-1 supply chain requirements. | Select when halogen content is not mandated and cost optimization is prioritized over material compliance. |
| SMCJ20CAHM3_A/H | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher PPPM (1500 W) and lower RθJA (35 °C/W). | Better thermal performance and surge margin; requires larger PCB footprint and different pad layout. | Choose when system-level surge testing exceeds 500 W or ambient temperatures exceed 105 °C with limited airflow. |
Compared with SMA5J20CAHE3_A/H, the SMA5J20CAHM3_A/H adds halogen-free compliance critical for automotive OEMs; versus SMCJ20CAHM3_A/H, it trades surge headroom and thermal margin for space-constrained layouts where 500 W protection suffices.
Availability
SMA5J20CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom power rail protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMA5J20CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMA5J series is engineered for high-power-density transient suppression in space-constrained automotive and industrial applications, balancing clamping performance, thermal efficiency, and AEC-Q101 compliance in the compact SMA package.
FAQ
What does the "HM3" suffix indicate in SMA5J20CAHM3_A/H?
The "HM3" suffix in SMA5J20CAHM3_A/H denotes halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance and automotive environmental requirements. It confirms compliance with major Tier-1 automotive material declarations and eliminates brominated flame retardants from the molding compound - a mandatory specification for modern vehicle ECUs.
Is SMA5J20CAHM3_A/H suitable for protecting CAN bus lines?
Yes, SMA5J20CAHM3_A/H is widely deployed for CAN FD and classical CAN bus protection due to its bidirectional symmetry, 20 V VWM matching 12 V automotive systems, and sub-1 ns response time. Its 32.4 V clamping voltage ensures transceivers like TJA1042 remain within absolute maximum ratings during ISO 7637-2 Pulse 1 (inductive load dump) events.
Does SMA5J20CAHM3_A/H require a heatsink for 500 W surge dissipation?
No, SMA5J20CAHM3_A/H relies on PCB copper thermal mass rather than external heatsinks. Per datasheet fig. 2, its 500 W rating assumes mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Adequate internal/external copper planes meeting this layout provide sufficient thermal dissipation for single-event surge handling without additional hardware.
How does SMA5J20CAHM3_A/H differ from unidirectional SMA5J20A variants?
SMA5J20CAHM3_A/H is bidirectional with symmetrical VBR and VC in both polarities, making it ideal for AC-coupled or differential lines like RS-485 or CAN. Unidirectional SMA5J20A has a cathode band and only clamps positive transients to ground - it cannot protect against negative-going surges without additional circuitry, unlike SMA5J20CAHM3_A/H.
What is the maximum number of 500 W surges SMA5J20CAHM3_A/H can withstand?
SMA5J20CAHM3_A/H is rated for non-repetitive surges per JEDEC standards; datasheet fig. 2 shows >1000 cycles at 50 % derated power (250 W). For full 500 W pulses, lifetime depends on thermal recovery - typical design practice limits repetitive 500 W events to ≤1 per minute with ≥1 s cooling interval between pulses to prevent cumulative junction temperature rise beyond 150 °C.
SMA5J20CAHM3_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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 15.4A
- 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)
SMA5J20CAHM3_A/H FAQ
1.How can I place an order for SMA5J20CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J20CAHM3_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 SMA5J20CAHM3_A/H reliable?
The price and inventory of SMA5J20CAHM3_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 SMA5J20CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMA5J20CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J20CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J20CAHM3_A/H?
SMA5J20CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J20CAHM3_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 SMA5J20CAHM3_A/H?
For technical support, including SMA5J20CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J20CAHM3_A/H requirements.
6.How does Aetrix verify that SMA5J20CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMA5J20CAHM3_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 SMA5J20CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMA5J20CAHM3_A/H?
All SMA5J20CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J20CAHM3_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 SMA5J20CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMA5J20CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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