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Vishay General Semiconductor - Diodes Division 1.5SMC51CAHM3/I
- Part No.:
- 1.5SMC51CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC51CAHM3/I.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,011
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Product details
Overview
1.5SMC51CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, designed for high-energy surge protection. It features a 51 V breakdown voltage (VBR = 48.5–53.6 V at IT = 1.0 mA), 43.6 V stand-off voltage (VWM), and clamps transients to ≤70.1 V at 21.4 A peak pulse current (IPPM) under 10/1000 µs waveform - used to protect automotive sensor signal lines, industrial I/O ports, and power supply rails against lightning-induced surges and inductive switching transients.
For engineers reviewing the 1.5SMC51CAHM3/I datasheet, 1.5SMC51CAHM3/I pinout, 1.5SMC51CAHM3/I application, or 1.5SMC51CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, MSL Level 1 rating, and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped shunt protector: when reverse (or forward, in bidirectional mode) voltage exceeds VWM = 43.6 V, it avalanches rapidly to limit transient energy across protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance enables effective clamping even during high-current events up to 1500 W peak pulse power.
The 1.5SMC51CAHM3/I is rated for continuous power dissipation of 6.5 W at TA = 50 °C and junction temperatures from –65 °C to +150 °C. Its thermal resistance (RθJA = 75 °C/W) reflects performance on minimum recommended copper pads (8.0 mm × 8.0 mm per terminal), and its fast response time (<1.0 ns) ensures protection before sensitive downstream components are damaged.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at IT = 1.0 mA - defines precise avalanche onset window for reliable clamping threshold control |
| VWM | 43.6 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | ≤70.1 V at IPPM = 21.4 A (10/1000 µs) - actual clamping voltage seen by protected IC or MOSFET during surge |
| PPPM | 1500 W - peak transient power handling capacity under standardized surge waveform |
| IPPM | 21.4 A - maximum non-repetitive surge current the device safely diverts without failure |
| TJ max. | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. Bidirectional configuration has no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Surge current input/output node | Both terminals function identically in bidirectional mode - connects across protected line and return (e.g., CAN_H/CAN_L, RS-485 A/B, or DC power rail) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per stress test requirements |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance mandates for automotive and industrial end equipment without compromising surge performance |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow soldering without moisture-related popcorn failure risk |
| 1500 W peak pulse power (10/1000 µs) | Provides robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) in industrial interfaces |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage stress on protected devices compared to higher-ratio TVS diodes |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: Protecting analog output lines of engine coolant temperature (ECT) and manifold absolute pressure (MAP) sensors from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal and ground to suppress ±70 V transients without distorting DC bias or small-signal integrity. Use Value: Prevents sensor IC latch-up or permanent damage during ISO 7637-2 Pulse 5a (load dump) events while maintaining <1.0 µA leakage at 43.6 V nominal supply. |
Use Scenario: Safeguarding differential data lines in factory automation PLCs against ESD and surge coupling from nearby motor drives. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, limiting common-mode transients on RS-485 A/B bus lines. Use Value: Ensures >25 kV HBM ESD immunity and withstands IEC 61000-4-4 EFT bursts without degrading signal edge rate or introducing jitter into 10 Mbps communication. |
| DC Power Rail Protection | Consumer USB Port Surge Guard |
|
Use Scenario: Clamping voltage spikes on 48 V telecom power distribution boards caused by relay contact bounce or hot-swap insertion. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor to absorb 1500 W transient energy within <1 ns, preventing overvoltage on downstream DC-DC converters. Use Value: Limits rail overshoot to ≤70.1 V during 21.4 A surges, avoiding overvoltage shutdown of 42 V-rated POL regulators and preserving system uptime. |
Use Scenario: Adding secondary surge protection on USB 2.0 VBUS and D+/D− lines in smart home hubs exposed to lightning-induced surges via AC adapter inputs. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (CJ < 100 pF at 0 V) placed before USB transceiver to avoid signal integrity degradation. Use Value: Provides IEC 61000-4-5 Level 2 (1 kV line-earth) immunity without increasing bit error rate or violating USB 2.0 eye diagram mask requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | Lower peak power rating (600 W vs. 1500 W); SMB package (smaller footprint, higher RθJA = 90 °C/W) | Suitable for lower-energy surges (IEC 61000-4-5 Level 2); less effective in automotive load-dump scenarios | Select when board space is constrained and surge threat level is moderate; verify thermal margin under sustained ambient conditions. |
| 1.5KE51CA | Through-hole DO-201 package; identical electrical specs but incompatible with SMT assembly and higher profile | Used in legacy or high-reliability through-hole designs; not suitable for automated high-volume production | Choose only for repair, prototyping, or applications requiring mechanical robustness over assembly efficiency. |
Compared with SMBJ51CA and 1.5KE51CA, the 1.5SMC51CAHM3/I delivers superior surge handling in a surface-mount format with automotive qualification and halogen-free compliance - making it optimal for new automotive and industrial designs requiring AEC-Q101 validation and 1500 W transient immunity.
Availability
1.5SMC51CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial communication interfaces, and DC power distribution systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for 1.5SMC51CAHM3/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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The 1.5SMC Series was developed to deliver high-power, surface-mount transient protection for automotive, industrial, and telecom applications where AEC-Q101 qualification, low-profile packaging, and repeatable clamping behavior are critical design requirements.
FAQ
What does the "CA" suffix indicate in 1.5SMC51CAHM3/I?
The "CA" suffix in 1.5SMC51CAHM3/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities, with identical breakdown and clamping characteristics regardless of voltage polarity applied across its terminals. This is essential for protecting AC-coupled or differential signal lines like CAN, RS-485, or audio paths where polarity reversal occurs during normal operation.
Is 1.5SMC51CAHM3/I compatible with lead-free reflow soldering processes?
Yes, 1.5SMC51CAHM3/I meets MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C, making it fully compatible with standard lead-free soldering profiles. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, ensuring reliable wetting and intermetallic formation without voiding or dewetting risks during single-pass reflow.
How does the HM3 suffix differ from M3 or E3 in the 1.5SMC51CAHM3/I part number?
The HM3 suffix in 1.5SMC51CAHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from M3 (halogen-free, commercial grade) and E3 (RoHS-compliant, commercial grade). The "H" prefix confirms automotive qualification, while "M3" specifies halogen-free materials, enabling use in safety-critical automotive ECUs and industrial controllers requiring full environmental and reliability certification.
What is the maximum clamping voltage of 1.5SMC51CAHM3/I under surge conditions?
The maximum clamping voltage (VC) of 1.5SMC51CAHM3/I is 70.1 V when subjected to its rated peak pulse current of 21.4 A under the standardized 10/1000 µs waveform. This value represents the highest voltage that will appear across protected circuitry during worst-case surge events, directly determining the overvoltage margin for downstream components such as microcontrollers or transceivers.
Can 1.5SMC51CAHM3/I be used in place of unidirectional TVS diodes like 1.5SMC51AHM3/I?
No - 1.5SMC51CAHM3/I is strictly bidirectional and lacks polarity marking; substituting it for a unidirectional device like 1.5SMC51AHM3/I may compromise protection in DC-biased circuits where forward conduction must be blocked. Unidirectional types rely on cathode band identification for correct orientation, whereas 1.5SMC51CAHM3/I functions identically in either direction and is intended for AC or floating differential applications only.
1.5SMC51CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 21.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC51CAHM3/I FAQ
1.How can I place an order for 1.5SMC51CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC51CAHM3/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 1.5SMC51CAHM3/I reliable?
The price and inventory of 1.5SMC51CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC51CAHM3/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC51CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC51CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC51CAHM3/I?
1.5SMC51CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC51CAHM3/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 1.5SMC51CAHM3/I?
For technical support, including 1.5SMC51CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC51CAHM3/I requirements.
6.How does Aetrix verify that 1.5SMC51CAHM3/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC51CAHM3/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 1.5SMC51CAHM3/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC51CAHM3/I?
All 1.5SMC51CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC51CAHM3/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 1.5SMC51CAHM3/I part is unused and in its original packaging.
Return procedure for 1.5SMC51CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC51CAHM3/I Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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