My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMB8J30CAHE3/5B
- Part No.:
- SMB8J30CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J30CAHE3/5B.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,339
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMB8J30CAHE3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 30 V stand-off voltage (VWM), 48.4 V maximum clamping voltage (VC) at 16.5 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J30CAHE3/5B datasheet, SMB8J30CAHE3/5B pinout, SMB8J30CAHE3/5B application, or SMB8J30CAHE3/5B equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping symmetry, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its bidirectional architecture enables symmetric clamping above ±30 V without polarity sensitivity, making it suitable for AC-coupled or floating signal paths.
Rated for -55 °C to +150 °C operation and qualified to AEC-Q101, SMB8J30CAHE3/5B sustains repetitive surge events when mounted per recommended pad layout, with thermal performance governed by RθJA = 72 °C/W and RθJL = 20 °C/W - critical for sustained surge duty cycles in engine control units and battery management systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 33.3 V / 36.8 V at 1.0 mA - ensures reliable breakdown onset within tight tolerance band |
| VC @ IPPM | 48.4 V at 16.5 A - defines worst-case clamped voltage seen by protected IC under 10/1000 µs surge |
| PPPM | 800 W - peak transient energy absorption capability with standard 10/1000 µs waveform |
| ID @ VWM | 1.0 µA - ultra-low leakage preserves signal integrity in high-impedance sensor circuits |
| TJ max. | +150 °C - supports under-hood automotive deployment without derating in most layouts |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with IPC-7351B standard, 0.220" × 0.130" |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; meets UL 94 V-0, J-STD-002 solderability, and JESD 22-B102 whisker resistance (Class 2). Bidirectional construction means no polarity marking - both terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no cathode band or polarity marking required |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns or baking requirements |
| Glass-passivated junction | Improves long-term stability and reduces parameter drift under thermal cycling and humidity exposure |
| 800 W surge rating with 10/1000 µs waveform | Meets ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 immunity requirements |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to limit transient excursions to <48.4 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V microcontrollers and signal conditioners exposed to ±100 V surges. |
Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges from relay coils and motor drives. IC Role / Device Role / Timing Role: Primary front-end TVS on 24 V DC input channels, shunting >1 kV transients before optocoupler or Schmitt trigger inputs. Use Value: Eliminates need for external series impedance or RC filtering while maintaining fast edge response for 10 kHz+ digital signals. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
Use Scenario: Shielding RS-485 transceivers in base station backhaul links from lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Secondary-level protection stage after gas discharge tube (GDT), clamping residual transients to safe levels for TI SN65HVD7x or similar ICs. Use Value: Achieves >30 kV ESD (IEC 61000-4-2) and 1 kV surge (IEC 61000-4-5) robustness without degrading signal rise time beyond 100 Mbps operation. |
Use Scenario: Hardening USB 2.0 data lines (D+/D−) in portable medical monitors against contact ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) bidirectional clamp placed adjacent to USB connector, before USB PHY IC. Use Value: Maintains signal integrity up to 480 Mbps while suppressing ±15 kV air-gap and ±8 kV contact ESD per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CAHE3/5B | Same SMB package and 30 V VWM, but rated for 600 W PPPM (vs. 800 W); lower IPPM (13.3 A vs. 16.5 A) | Limited to lower-energy transients; insufficient for ISO 7637-2 Pulse 5a (load dump) | Select SMB8J30CAHE3/5B where full 800 W surge margin is required for harsh automotive environments |
| SMCJ30CAHE3/5B | Higher-power SMC (DO-214AB) package; same 30 V VWM, 48.4 V VC, but 1500 W PPPM and 31.3 A IPPM | Larger footprint (0.285" × 0.235"); better thermal dissipation but incompatible with dense PCB layouts | Choose SMCJ30CAHE3/5B only when board space allows and thermal budget exceeds 800 W duty cycle demands |
Compared with SMBJ30CAHE3/5B and SMCJ30CAHE3/5B, SMB8J30CAHE3/5B delivers optimal balance of high surge capacity (800 W), compact SMB footprint, and AEC-Q101 compliance - making it the preferred choice for space-constrained automotive and industrial modules requiring validated reliability.
Availability
SMB8J30CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer USB port hardening requiring stable component supply across production lifecycles.
Supply support for SMB8J30CAHE3/5B 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 automotive qualification.
SMB8J30CAHE3/5B belongs to Vishay's TRANSZORB® family of high-power-density TVS diodes, engineered specifically for robust transient suppression in automotive, industrial, and communications infrastructure where AEC-Q101 validation and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMB8J30CAHE3/5B at its rated peak pulse current?
The SMB8J30CAHE3/5B has a maximum clamping voltage (VC) of 48.4 V when subjected to its specified peak pulse current (IPPM) of 16.5 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and represents the upper bound of voltage imposed on protected circuitry during a standardized surge event - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings.
Is SMB8J30CAHE3/5B suitable for automotive applications?
Yes, SMB8J30CAHE3/5B is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD verification. Its -55 °C to +150 °C operating range, MSL Level 1 rating, and RoHS-compliant construction make SMB8J30CAHE3/5B appropriate for engine control units, body electronics, and ADAS sensor modules.
How does the bidirectional configuration of SMB8J30CAHE3/5B affect its circuit implementation?
The bidirectional configuration of SMB8J30CAHE3/5B eliminates polarity constraints - both terminals are electrically identical, with no cathode marking required. This allows direct placement across AC-coupled lines (e.g., RS-485, CAN, audio) or floating differential pairs without orientation checks. Unlike unidirectional TVS diodes, SMB8J30CAHE3/5B clamps symmetrically above ±30 V, simplifying layout and reducing risk of incorrect installation in high-volume manufacturing.
What is the thermal resistance profile of SMB8J30CAHE3/5B, and why does it matter?
SMB8J30CAHE3/5B has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" copper pads. RθJL governs short-duration surge thermal handling, while RθJA determines steady-state temperature rise. These values validate its suitability for repeated surge events in confined spaces - essential for designs where airflow is limited and thermal relief cannot rely solely on large ground planes.
Does SMB8J30CAHE3/5B require additional series impedance for effective protection?
No, SMB8J30CAHE3/5B is designed for direct placement at the threat entry point without mandatory series impedance. Its low clamping voltage (48.4 V), fast response, and low incremental surge resistance enable effective protection of 3.3 V/5 V logic when combined with proper PCB layout (short traces, dedicated ground plane). However, for very high-energy threats (e.g., ISO 7637-2 Pulse 5a), a coordinated protection scheme with upstream GDT or PTC may be used - but SMB8J30CAHE3/5B itself functions standalone.
SMB8J30CAHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 16.5A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J30CAHE3/5B FAQ
1.How can I place an order for SMB8J30CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J30CAHE3/5B 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 SMB8J30CAHE3/5B reliable?
The price and inventory of SMB8J30CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J30CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J30CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J30CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J30CAHE3/5B?
SMB8J30CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J30CAHE3/5B 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 SMB8J30CAHE3/5B?
For technical support, including SMB8J30CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J30CAHE3/5B requirements.
6.How does Aetrix verify that SMB8J30CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J30CAHE3/5B 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 SMB8J30CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J30CAHE3/5B?
All SMB8J30CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J30CAHE3/5B, 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 SMB8J30CAHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J30CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J30CAHE3/5B 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 …
