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Vishay General Semiconductor - Diodes Division SMAJ43CAHM3_A/H
- Part No.:
- SMAJ43CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CAHM3_A/H.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,527
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Product details
Overview
SMAJ43CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 43 V standoff voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 69.4 V maximum clamping voltage (VC) at 5.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ43CAHM3_A/H datasheet, SMAJ43CAHM3_A/H pinout, SMAJ43CAHM3_A/H application, or SMAJ43CAHM3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and thermal resistance (RθJA = 120 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding VWM, it avalanches symmetrically in both directions to clamp voltage at ≤69.4 V while diverting surge current up to 5.8 A (10/1000 μs). Its glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at 43 V).
Designed for surface-mount automated assembly, it meets MSL level 1 (reflow peak 260 °C), has matte tin-plated leads compliant with J-STD-002, and delivers repeatable performance across -55 °C to +150 °C junction temperature range - critical for under-hood automotive and factory-floor industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 47.8 V / 52.8 V at 1 mA - guaranteed symmetric breakdown threshold for bidirectional protection |
| VC @ IPPM | 69.4 V at 5.8 A - clamped voltage during 10/1000 μs surge, limiting stress on downstream ICs |
| PPPM | 400 W - peak pulse power handling capability, derated to 300 W above 78 V |
| IFSM | 40 A - non-repetitive forward surge current rating (8.3 ms half-sine), relevant for unidirectional testing |
| TJ max | +150 °C - maximum junction temperature, enabling operation in high-ambient industrial and automotive locations |
| RθJA | 120 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads, guiding heatsinking decisions |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with molded compound rated UL 94 V-0; polarity not marked for bidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | One terminal of symmetrical PN junction - accepts surge current in either polarity |
| Cathode | Transient current exit (bidirectional) | Second terminal of symmetrical PN junction - completes low-impedance path to ground or rail during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22 standards |
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and lead finish - meets IPC-1752A material declaration requirements |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω coupling) on 12 V/24 V systems without degradation |
| Fast response time | <1.0 ps junction response enables clamping before most ICs experience latch-up or gate oxide damage |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving protection margin |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Transceiver Protection |
|---|---|
|
Use Scenario: Protecting LIN bus and power supply inputs in BCMs exposed to load dump and jump-start transients. IC Role / Device Role: Bidirectional shunt TVS placed between VBAT and ground, clamping spikes up to 400 W. Use Value: Prevents MCU reset or regulator latch-up during 12 V system transients per ISO 16750-2, enabled by AEC-Q101 qualification and 69.4 V clamping. |
Use Scenario: Safeguarding CANH/CANL pins of isolated transceivers against ESD and EFT in factory automation nodes. IC Role / Device Role: Differential TVS pair (two SMAJ43CAHM3_A/H) across CAN bus lines to suppress ±8 kV contact ESD (IEC 61000-4-2). Use Value: Maintains CAN signal integrity below 1 Mbps with <1.0 pF junction capacitance (typ.) and symmetrical clamping at 69.4 V. |
| Consumer Appliance Motor Drive Board | Telecom Power Input Stage |
|
Use Scenario: Suppressing inductive kickback from brushed DC motors in washing machine control boards. IC Role / Device Role: Bidirectional TVS across motor terminals to clamp flyback voltages during PWM switching. Use Value: Withstands repetitive 400 W pulses at 0.01% duty cycle, preventing MOSFET avalanche failure and ensuring 10-year field life. |
Use Scenario: Front-end protection of 48 V telecom power supplies against lightning-induced surges on AC/DC input. IC Role / Device Role: Primary shunt protector on DC input rail, coordinated with upstream MOVs and fuses per IEC 61643-21. Use Value: 43 V VWM allows compatibility with 48 V nominal systems while clamping at 69.4 V - within safe margin of 75 V-rated DC-DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43CAHE3_A/H | Same electrical specs, but RoHS-compliant (E3) without halogen-free requirement; no AEC-Q101 qualification | Suitable for commercial/industrial use where automotive qualification is not mandated | Select when cost sensitivity outweighs automotive reliability validation needs |
| SMAJ43AHE3_A/H | Unidirectional variant; cathode band marking; 69.4 V clamping only in reverse direction | Applicable only where polarity is fixed (e.g., DC power input with known ground reference) | Choose only if circuit topology guarantees unidirectional surge exposure and space permits polarity-aware layout |
Compared with SMAJ43CAHM3_A/H, the HE3 variant lacks AEC-Q101 validation and halogen-free status, while the unidirectional SMAJ43AHE3_A/H requires strict polarity control and offers no positive-side clamping - making SMAJ43CAHM3_A/H the sole choice for automotive bidirectional protection with full compliance assurance.
Availability
SMAJ43CAHM3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, telecom power inputs, and consumer appliance motor drives requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ43CAHM3_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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, precise clamping, and surface-mount manufacturability are mandatory.
FAQ
What does the "HM3" suffix indicate in SMAJ43CAHM3_A/H?
The HM3 suffix in SMAJ43CAHM3_A/H denotes halogen-free, RoHS-compliant construction and AEC-Q101 qualification. It confirms the device meets automotive reliability standards including temperature cycling, highly accelerated life testing, and electrostatic discharge immunity - essential for under-hood and chassis-mounted applications where long-term stability is non-negotiable.
Is SMAJ43CAHM3_A/H suitable for protecting CAN FD interfaces?
Yes, SMAJ43CAHM3_A/H is suitable for CAN FD interfaces when used differentially across CANH/CANL. Its 69.4 V clamping voltage and bidirectional symmetry ensure protection against ESD and EFT without distorting the 5 Mbps signal waveform; however, its ~100 pF junction capacitance (measured at VWM) must be verified against bus timing budgets in high-speed implementations.
How does SMAJ43CAHM3_A/H perform under repeated surge stress?
SMAJ43CAHM3_A/H supports repetitive 400 W surges at 0.01% duty cycle (per Fig. 2 in Vishay Doc. 88390), meaning it can withstand 1000 pulses/hour without parameter shift. At elevated ambient temperatures (>25 °C), derating applies: at 85 °C, peak pulse power drops to ~280 W - requiring thermal design validation for high-duty-cycle industrial deployments.
Can SMAJ43CAHM3_A/H replace SMAJ43AHE3_A/H in an existing design?
No - SMAJ43CAHM3_A/H is bidirectional while SMAJ43AHE3_A/H is unidirectional. Swapping them without circuit review risks failure: the unidirectional part conducts forward current during positive transients, potentially damaging upstream regulators or fuses. Layout and schematic must confirm polarity constraints before substitution.
What is the minimum recommended PCB pad layout for SMAJ43CAHM3_A/H?
Vishay specifies 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated 400 W pulse power. Smaller pads reduce thermal dissipation and cause premature thermal runaway during surges. The SMA (DO-214AC) footprint must match IPC-7351B generic outline with 2.54 mm lead pitch and 1.98 mm terminal width - verified in Vishay's package drawing 88390, page 5.
SMAJ43CAHM3_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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 5.8A
- 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)
SMAJ43CAHM3_A/H FAQ
1.How can I place an order for SMAJ43CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CAHM3_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 SMAJ43CAHM3_A/H reliable?
The price and inventory of SMAJ43CAHM3_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 SMAJ43CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ43CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CAHM3_A/H?
SMAJ43CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CAHM3_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 SMAJ43CAHM3_A/H?
For technical support, including SMAJ43CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ43CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ43CAHM3_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 SMAJ43CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ43CAHM3_A/H?
All SMAJ43CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CAHM3_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 SMAJ43CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ43CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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