My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ8.5AHE3_A/H
- Part No.:
- SMAJ8.5AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ8.5AHE3_A/H.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,893
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ8.5AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA test current, and clamps up to 14.4 V at 27.8 A peak pulse current (IPPM) under 10/1000 μs waveform.
For engineers reviewing the SMAJ8.5AHE3_A/H datasheet, SMAJ8.5AHE3_A/H pinout, SMAJ8.5AHE3_A/H application, or SMAJ8.5AHE3_A/H equivalent, key selection considerations include its AEC-Q101 qualification for automotive use, 400 W peak pulse power rating (10/1000 μs), low clamping ratio (VC/VBR ≈ 1.45), and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for fast response (<1 ns) and low incremental surge resistance. Its thermal design relies on junction-to-lead thermal resistance of 30 °C/W and junction-to-ambient of 120 °C/W when mounted on 0.2" × 0.2" copper pads.
The device meets MSL Level 1 per J-STD-020 with 260 °C reflow peak, supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and delivers stable clamping performance across -55 °C to +150 °C operating junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 14.4 V at 27.8 A - Clamped voltage under 10/1000 μs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 400 W - Peak pulse power handling capability; enables protection against IEC 61000-4-5 Level 4 surges when properly mounted. |
| ID @ VWM | 10 μA - Reverse leakage at stand-off voltage; low value minimizes standby power loss and signal integrity impact. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| AEC-Q101 | Qualified - 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 case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to circuit ground or lower-potential node; conducts during positive transients when cathode is biased higher. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., power rail or signal); initiates avalanche conduction when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against high-energy transients common in 12 V automotive power nets and industrial I/O lines. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Glass passivated junction | Ensures stable electrical characteristics over time and environmental stress, reducing parameter drift in humid or thermally cycled conditions. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow processes without preconditioning, simplifying manufacturing integration. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to downstream components while maintaining margin above VWM. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power input and ground, triggered within nanoseconds of overvoltage event. Use Value: Limits transient voltage to ≤14.4 V, preventing damage to 16 V-rated LDOs and microcontrollers in engine control modules. |
Use Scenario: Shielding analog outputs of pressure or temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair or single-ended output to ground. Use Value: 10 μA leakage preserves sensor accuracy; 14.4 V clamping prevents latch-up in op-amp front-ends. |
| Consumer USB Port Surge Protection | Telecom DSL Line Interface Protection |
|
Use Scenario: Safeguarding USB 2.0 VBUS and D+/D− lines against human-body-model ESD and hot-plug spikes. IC Role / Device Role / Timing Role: Discrete unidirectional TVS on VBUS rail; bidirectional variants used on data lines. Use Value: 400 W rating handles multiple contact discharges; AEC-Q101 qualification adds reliability margin for premium peripherals. |
Use Scenario: Front-end protection for ADSL/VDSL line drivers exposed to lightning-induced surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Primary clamping device in hybrid protection circuit, coordinated with GDT and PTC. Use Value: 27.8 A IPPM capacity absorbs IEC 61000-4-5 combination wave energy; DO-214AC footprint allows compact board layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A-E3/61 | Commercial-grade RoHS-compliant version without AEC-Q101 qualification; identical electrical specs and package. | Lacks automotive reliability validation; suitable for consumer or industrial applications where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive qualification requirements and long-term field reliability under thermal cycling is not critical. |
| SMAJ8.5CAHE3_A/H | Bidirectional variant with same VWM (8.5 V) and clamping performance; symmetric breakdown in both polarities. | Required for AC-coupled or floating signal lines where polarity reversal or differential surges occur. | Choose for RS-485, CAN bus, or Ethernet PHY protection where bidirectional clamping is essential. |
Compared with SMAJ8.5AHE3_A/H, the SMAJ8.5A-E3/61 offers identical clamping behavior at lower cost but no automotive qualification, while SMAJ8.5CAHE3_A/H provides polarity-agnostic protection at the expense of slightly higher junction capacitance-critical for high-speed signal integrity.
Availability
SMAJ8.5AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom line protection requiring stable component supply with full AEC-Q101 traceability and consistent lot-to-lot performance.
Supply support for SMAJ8.5AHE3_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 reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against ESD, lightning, and load dump is mission-critical.
FAQ
What is the clamping voltage of SMAJ8.5AHE3_A/H under a 10/1000 μs surge?
The SMAJ8.5AHE3_A/H clamps to a maximum of 14.4 V when subjected to its rated peak pulse current of 27.8 A under the standardized 10/1000 μs waveform. This clamping voltage is measured at the device terminals with proper PCB layout-0.2" × 0.2" copper pads per terminal-and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ8.5AHE3_A/H maintains this performance across its full operating temperature range.
Is SMAJ8.5AHE3_A/H suitable for automotive applications?
Yes, SMAJ8.5AHE3_A/H is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature reverse bias, and ESD immunity required for automotive electronic modules. Its construction-glass-passivated junction, MSL Level 1 rating, and operating junction temperature up to +150 °C-makes it appropriate for engine control units, body controllers, and ADAS sensor interfaces. The SMAJ8.5AHE3_A/H part number explicitly denotes this qualification via the "HE3" suffix.
How does the breakdown voltage tolerance of SMAJ8.5AHE3_A/H affect circuit design?
The SMAJ8.5AHE3_A/H has a specified breakdown voltage range of 9.44 V to 10.4 V at 1 mA test current, reflecting inherent process variation. Designers must ensure that the minimum VBR (9.44 V) remains safely above the system's maximum normal operating voltage-including tolerances and ripple-to prevent false triggering, while the maximum clamping voltage (14.4 V) stays below the absolute maximum rating of protected components. This tolerance band is factored into the SMAJ8.5AHE3_A/H's 8.5 V stand-off voltage to provide adequate guardband.
What is the thermal resistance profile of SMAJ8.5AHE3_A/H and how does it impact power dissipation?
The SMAJ8.5AHE3_A/H exhibits a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads. This means that under continuous DC conditions, its 3.3 W power dissipation rating is limited by ambient temperature rise; however, during transient events, the short duration (≤1000 μs) prevents significant thermal accumulation. For repeated surges, duty cycle derating per Figure 2 in the datasheet must be applied to avoid exceeding the SMAJ8.5AHE3_A/H's 150 °C maximum junction temperature.
Can SMAJ8.5AHE3_A/H be used in bidirectional signal protection?
No-SMAJ8.5AHE3_A/H is a unidirectional TVS diode, intended for protection of DC rails or single-polarity signals where the cathode is connected to the protected line and anode to ground. For bidirectional applications such as AC-coupled data lines (e.g., RS-485, CAN, USB D+), the bidirectional variant SMAJ8.5CAHE3_A/H must be used instead. Using SMAJ8.5AHE3_A/H in reverse-biased configurations risks permanent failure due to lack of symmetrical avalanche capability.
SMAJ8.5AHE3_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:
- 1
- Bidirectional Channels:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ8.5AHE3_A/H FAQ
1.How can I place an order for SMAJ8.5AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ8.5AHE3_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 SMAJ8.5AHE3_A/H reliable?
The price and inventory of SMAJ8.5AHE3_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 SMAJ8.5AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ8.5AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ8.5AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ8.5AHE3_A/H?
SMAJ8.5AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ8.5AHE3_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 SMAJ8.5AHE3_A/H?
For technical support, including SMAJ8.5AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ8.5AHE3_A/H requirements.
6.How does Aetrix verify that SMAJ8.5AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ8.5AHE3_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 SMAJ8.5AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ8.5AHE3_A/H?
All SMAJ8.5AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ8.5AHE3_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 SMAJ8.5AHE3_A/H part is unused and in its original packaging.
Return procedure for SMAJ8.5AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ8.5AHE3_A/H Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
