My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ8.5AHE3_A/I
;;2.jpg)
- Part No.:
- SMBJ8.5AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5AHE3_A/I.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,402
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ8.5AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 41.7 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform). It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMBJ8.5AHE3_A/I datasheet, SMBJ8.5AHE3_A/I pinout, SMBJ8.5AHE3_A/I application, or SMBJ8.5AHE3_A/I equivalent, this page delivers verified electrical parameters, thermal derating behavior, clamping performance under standardized surge waveforms, AEC-Q101 qualification status, and direct alternatives with documented parameter differences - all specific to the SMBJ8.5AHE3_A/I variant.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its specified VBR range (9.44–10.4 V). Its low clamping ratio (VC/VBR ≈ 1.45) and sub-nanosecond response time ensure effective protection of downstream silicon against IEC 61000-4-2 ESD and IEC 61000-4-5 surge events.
Thermal design relies on its RθJA of 100 °C/W and RθJL of 20 °C/W, with derating above 25 °C ambient per Figure 2. The device is rated for TJ = –55 to +150 °C and meets MSL Level 1 (260 °C reflow peak), supporting automated SMT assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - Maximum continuous reverse operating voltage before significant leakage; sets minimum system operating margin. |
| VBR (Breakdown Voltage) | 9.44–10.4 V at IT = 1 mA - Confirmed avalanche initiation range; defines precise turn-on threshold for transient suppression. |
| VC (Clamping Voltage) | 14.4 V at IPPM = 41.7 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines safe voltage headroom for downstream ICs. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy-handling capability under standardized 10/1000 µs surge; enables robust protection in 12 V automotive and industrial DC rails. |
| ID (Reverse Leakage) | 20 µA max at VWM = 8.5 V - Low quiescent current ensures minimal power loss and no interference with high-impedance sensing nodes. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and enclosed industrial enclosures without thermal shutdown. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing; supports PPAP-compliant designs. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VREV > VBR. |
| Anode (unbanded end) | Reference/ground return | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity on 12 V supply rails without external series impedance. |
| AEC-Q101 qualification | Validates long-term reliability under automotive thermal, mechanical, and electrical stress profiles - required for Tier 1 ECUs and ADAS modules. |
| Low clamping voltage (14.4 V @ 41.7 A) | Provides ≥2.5 V margin below typical 16–17 V absolute maximum rating of automotive microcontrollers and gate drivers. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow without baking or special handling - reduces manufacturing cost and risk of moisture-induced popcorning. |
| Glass passivated junction | Ensures stable VBR and low leakage over lifetime, even under humidity and temperature cycling stress common in industrial field deployments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied control module exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp transients before they reach LDOs and MCU power pins. Use Value: Limits voltage excursion to ≤14.4 V during 41.7 A surges, preserving 16 V-rated power management ICs and avoiding brownout resets. |
Use Scenario: Analog output line (4–20 mA) from pressure sensor routed across noisy factory floor. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt ESD and inductive kickback away from op-amp input stage. Use Value: Sub-nanosecond response prevents latch-up in precision amplifiers; 20 µA leakage avoids offset error in µA-level current loops. |
| Consumer USB Port ESD Protection | Telecom DC Feeder Line Surge Suppression |
|
Use Scenario: USB VBUS line in portable docking station subject to human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Primary clamping device on 5 V rail upstream of USB controller and power switch. Use Value: Clamps 8 kV contact discharge to <14.4 V within <1 ns, preventing damage to USB PHY transceivers and maintaining enumeration integrity. |
Use Scenario: -48 V DC power feed to remote radio unit in cellular base station. IC Role / Device Role / Timing Role: Front-end TVS on power input to protect DC-DC converter and monitoring circuitry from lightning-induced surges. Use Value: Withstands 600 W surges while maintaining 8.5 V stand-off - compatible with telecom -48 V nominal systems using positive-ground architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A-E3/52 | Commercial-grade (non-AEC-Q101); same VWM, VBR, VC, and PPPM; RoHS-compliant but not automotive-qualified. | Lacks AEC-Q101 validation; unsuitable for automotive safety-critical modules requiring PPAP documentation. | Select when cost-sensitive industrial or consumer designs do not require automotive reliability certification. |
| SMBJ8.5CAHE3_A/I | Bidirectional variant; identical VWM (8.5 V), VBR (9.44–10.4 V), and VC (14.4 V), but symmetrical conduction in both polarities. | Required for AC-coupled or floating signal lines where polarity reversal or differential surges occur (e.g., RS-485, CAN bus). | Choose only if bidirectional clamping is needed; unidirectional SMBJ8.5AHE3_A/I offers lower leakage and simpler grounding in DC rail applications. |
Compared with SMBJ8.5A-E3/52, the SMBJ8.5AHE3_A/I adds AEC-Q101 qualification for automotive use without sacrificing clamping performance; compared with SMBJ8.5CAHE3_A/I, it provides optimized unidirectional leakage and grounding simplicity for DC power rails - making it the preferred choice for 12 V/24 V automotive and industrial supply protection.
Availability
SMBJ8.5AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, consumer USB power delivery systems, and telecom DC feeder protection requiring stable component supply and full traceability.
Supply support for SMBJ8.5AHE3_A/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, low clamping, and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ8.5AHE3_A/I under a 10/1000 µs surge?
The SMBJ8.5AHE3_A/I has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 41.7 A using the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and guarantees that protected circuits will not experience voltages exceeding 14.4 V during such transients - critical for safeguarding 16 V-rated automotive ICs. The SMBJ8.5AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is SMBJ8.5AHE3_A/I suitable for automotive applications?
Yes, SMBJ8.5AHE3_A/I is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, highly accelerated life testing (HALT), and ESD verification per automotive standards. Its construction - glass-passivated junction, MSL Level 1 rating, and –55 °C to +150 °C operating range - makes it appropriate for engine control units, body electronics, and ADAS modules. The "HE3" suffix explicitly denotes AEC-Q101 compliance, distinguishing it from commercial variants like SMBJ8.5A-E3/52.
How does SMBJ8.5AHE3_A/I differ from SMBJ8.5CAHE3_A/I?
SMBJ8.5AHE3_A/I is unidirectional, conducting only in reverse bias to clamp positive transients on grounded systems, while SMBJ8.5CAHE3_A/I is bidirectional and clamps surges of either polarity - essential for AC or differential lines like RS-485 or CAN. Both share identical VWM (8.5 V), VBR (9.44–10.4 V), and VC (14.4 V), but the unidirectional SMBJ8.5AHE3_A/I exhibits lower reverse leakage (20 µA vs. 40 µA for the bidirectional version), improving accuracy in high-impedance sensing paths.
What is the thermal resistance of SMBJ8.5AHE3_A/I, and how does it affect layout?
SMBJ8.5AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W. To maintain safe operation at full 600 W surge capability, PCB layout must use minimum recommended copper pad areas (0.2" × 0.2" per terminal) and avoid excessive trace length. Derating begins above 25 °C ambient - at 85 °C ambient, maximum allowable power drops to ~3 W - so thermal relief must be considered in enclosed or high-temperature environments.
Does SMBJ8.5AHE3_A/I require a heatsink for normal operation?
No, SMBJ8.5AHE3_A/I does not require an external heatsink during normal steady-state operation because its continuous power dissipation (PD) is only 5.0 W - well within safe limits when mounted on standard 0.2" × 0.2" copper pads. However, during transient events, heat is absorbed capacitively in the junction and dissipated through the leads and PCB. The low RθJL (20 °C/W) ensures efficient short-duration thermal transfer, eliminating need for added thermal mass unless operating continuously near PD limit in high-ambient conditions.
SMBJ8.5AHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 41.7A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ8.5AHE3_A/I FAQ
1.How can I place an order for SMBJ8.5AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5AHE3_A/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 SMBJ8.5AHE3_A/I reliable?
The price and inventory of SMBJ8.5AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ8.5AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5AHE3_A/I?
SMBJ8.5AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5AHE3_A/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 SMBJ8.5AHE3_A/I?
For technical support, including SMBJ8.5AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5AHE3_A/I requirements.
6.How does Aetrix verify that SMBJ8.5AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5AHE3_A/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 SMBJ8.5AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ8.5AHE3_A/I?
All SMBJ8.5AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5AHE3_A/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 SMBJ8.5AHE3_A/I part is unused and in its original packaging.
Return procedure for SMBJ8.5AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5AHE3_A/I 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 …
