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Vishay General Semiconductor - Diodes Division SMAJ8.5CAHM3/H
- Part No.:
- SMAJ8.5CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5CAHM3/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,388
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Product details
Overview
SMAJ8.5CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA test current, 14.4 V maximum clamping voltage (VC) at 27.8 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial systems.
For engineers reviewing the SMAJ8.5CAHM3/H datasheet, SMAJ8.5CAHM3/H pinout, SMAJ8.5CAHM3/H application, or SMAJ8.5CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VWM ≈ 1.69), and compatibility with automated SMT placement on PCBs with 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, diverting transient energy away from downstream circuitry. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity concerns in AC-coupled or differential signal paths.
The SMAJ8.5CAHM3/H uses a glass-passivated silicon junction for stable leakage performance and fast response time (<1 ps), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It is rated for repetitive surge duty cycle ≤0.01 % and operates across -55 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping onset. |
| VBR (Breakdown Voltage) | 9.44–10.4 V at 1 mA - Voltage at which avalanche conduction begins; tight tolerance enables predictable protection threshold. |
| VC (Clamping Voltage) | 14.4 V at IPPM = 27.8 A - Peak voltage seen by protected circuit during 10/1000 μs transient; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Maximum transient energy dissipation capability under standard 10/1000 μs waveform; defines surge robustness level. |
| ID (Reverse Leakage) | 10 μA max at VWM - Low leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-020 MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 (cathode band side opposite) | Bidirectional device - no functional polarity; either terminal serves as reference point for symmetrical clamping. |
| Cathode | Terminal 2 (marked with cathode band) | No marking on bidirectional types per datasheet; terminals are electrically interchangeable in AC or differential applications. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - eliminates need for polarity-aware layout in sensor bridges or RS-485 lines. |
| AEC-Q101 qualification | Validated for automotive electronics - enables use in ADAS camera modules, body control units, and infotainment power rails without additional qualification effort. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes halogen-free molding compound and full RoHS compliance - satisfies EU ELV and China RoHS requirements for vehicle supply chains. |
| 400 W peak pulse power | Rated for 10/1000 μs waveform on 5.0 mm × 5.0 mm copper pads - provides robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| Low clamping ratio | VC/VWM = 1.69 - minimizes overvoltage stress on 12 V rail interfaces while maintaining margin above system nominal voltage. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
|
Use Scenario: Protecting analog output pins of pressure/temperature sensors in engine control modules exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across sensor output and ground to shunt transients before they reach ADC input or op-amp buffer. Use Value: Prevents sensor signal corruption and microcontroller reset events caused by >100 V spikes, leveraging SMAJ8.5CAHM3/H's 14.4 V clamping at 27.8 A. |
Use Scenario: Guarding CANH/CANL differential pair in industrial PLC gateways subjected to EFT and surge per IEC 61000-4-4/4-5. IC Role / Device Role / Timing Role: Common-mode TVS mounted between CANH-GND and CANL-GND to suppress asymmetric surges without distorting differential signaling. Use Value: Maintains CAN bit timing integrity by limiting common-mode overvoltage to <15 V, avoiding transceiver latch-up or bus dominant timeout errors. |
| Consumer USB Power Delivery | Telecom DSL Line Interface |
|
Use Scenario: Safeguarding 5 V USB-C VBUS line against hot-plug induced transients and electrostatic discharge in portable docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between VBUS and GND to clamp fast-rising ESD events (IEC 61000-4-2 ±15 kV contact) before reaching USB PD controller. Use Value: Enables compliance with USB-IF ESD immunity requirements using a single 8.5 V standoff device with sub-100 ps response and <10 μA leakage at 5 V. |
Use Scenario: Protecting ADSL/VDSL line driver/receiver circuits from lightning-induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Primary protection device installed at line entry point, clamping longitudinal mode surges before hybrid transformer and codec ICs. Use Value: Withstands 400 W 10/1000 μs surges per ITU-T K.20/K.21, reducing secondary protector stress and extending DSL modem field lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5CAHE3/H | Same electrical specs, but RoHS-compliant without halogen-free compound; not AEC-Q101 qualified. | Approved for commercial/industrial use only; excluded from automotive production BOMs requiring AEC-Q101. | Select SMAJ8.5CAHE3/H only for cost-sensitive non-automotive designs where halogen content is unrestricted. |
| SMBJ8.5CAHM3 | Same VWM/VBR/VC ratings, but SMB (DO-214AA) package - 2.5× higher thermal resistance (RθJA = 160 °C/W vs. 120 °C/W). | Lower power derating above 25 °C; requires larger copper area or forced cooling for same 400 W pulse handling. | Choose SMBJ8.5CAHM3 only if board space constraints favor wider but shorter SMB footprint over SMA's compact length. |
Compared with SMAJ8.5CAHE3/H, the SMAJ8.5CAHM3/H adds AEC-Q101 qualification and halogen-free compliance essential for Tier 1 automotive programs; versus SMBJ8.5CAHM3, it delivers superior thermal performance in constrained layouts due to lower RθJA and optimized pad coupling.
Availability
SMAJ8.5CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interface, consumer USB power delivery, and telecom DSL line interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMAJ8.5CAHM3/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 developed specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure - balancing low clamping voltage, fast response, and robust surge handling in compact surface-mount packages.
FAQ
What is the clamping voltage of the SMAJ8.5CAHM3/H under a 10/1000 μs surge?
The SMAJ8.5CAHM3/H has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 27.8 A with a 10/1000 μs waveform. This value is measured per JEDEC standards and ensures downstream ICs see no more than 14.4 V during transient events - critical for protecting 12 V rail interfaces and 5 V logic circuits. The SMAJ8.5CAHM3/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMAJ8.5CAHM3/H suitable for automotive applications?
Yes, the SMAJ8.5CAHM3/H is AEC-Q101 qualified and explicitly designated for automotive use via the HM3 suffix and "_H" packaging code. It passes rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD per AEC-Q101 Rev D. The SMAJ8.5CAHM3/H is deployed in engine control units, ADAS camera modules, and body electronics where reliable transient suppression is mandated by OEM specifications.
How does the SMAJ8.5CAHM3/H differ from unidirectional variants like SMAJ8.5A?
The SMAJ8.5CAHM3/H is bidirectional, meaning it clamps symmetrically in both polarities - ideal for AC signals, differential buses (e.g., CAN, RS-485), or circuits where voltage polarity reversal may occur. In contrast, SMAJ8.5A is unidirectional with a defined cathode band and only clamps in reverse bias. The SMAJ8.5CAHM3/H has identical VWM (8.5 V), VBR (9.44–10.4 V), and VC (14.4 V) ratings but no polarity marking and no forward voltage drop specification.
What is the maximum reverse leakage current for the SMAJ8.5CAHM3/H at its stand-off voltage?
The SMAJ8.5CAHM3/H exhibits a maximum reverse leakage current (ID) of 10 μA at its 8.5 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage preserves signal fidelity in high-impedance sensor interfaces and minimizes quiescent power loss in battery-powered systems. Leakage remains below 50 μA up to +125 °C, ensuring stable performance across automotive under-hood conditions.
Does the SMAJ8.5CAHM3/H require special PCB layout considerations?
Yes - to achieve its rated 400 W peak pulse power, the SMAJ8.5CAHM3/H must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's thermal design guidelines. Short, wide traces reduce inductance and improve clamping response; ground planes beneath the device enhance heat dissipation. Avoid thermal relief on pads, and ensure solder mask clearance matches the SMA (DO-214AC) outline to prevent tombstoning during reflow.
SMAJ8.5CAHM3/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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 27.8A
- 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)
SMAJ8.5CAHM3/H FAQ
1.How can I place an order for SMAJ8.5CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5CAHM3/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 SMAJ8.5CAHM3/H reliable?
The price and inventory of SMAJ8.5CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ8.5CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ8.5CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5CAHM3/H?
SMAJ8.5CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5CAHM3/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 SMAJ8.5CAHM3/H?
For technical support, including SMAJ8.5CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5CAHM3/H requirements.
6.How does Aetrix verify that SMAJ8.5CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5CAHM3/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 SMAJ8.5CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ8.5CAHM3/H?
All SMAJ8.5CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5CAHM3/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 SMAJ8.5CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ8.5CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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