My Inquiry
My Account
Taiwan Semiconductor Corporation SMBJ64
- Part No.:
- SMBJ64
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ64.pdf
- Description:
- 600W, 79V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,998
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ64 from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with 64 V working stand-off voltage (VWM), 71.1–86.9 V breakdown voltage (VBR), and 114 V maximum clamping voltage (VC) at 5.5 A peak impulse current (IPP). It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ64 datasheet, SMBJ64 pinout, SMBJ64 application, or SMBJ64 equivalent, key selection criteria include clamping performance under 10/1000 µs surge, junction temperature derating above 25°C, unidirectional polarity marking, and compliance with J-STD-020 Level 1 moisture sensitivity for reflow compatibility.
Technical Context
The SMBJ64 operates as a silicon avalanche diode, triggered when reverse voltage exceeds its VBR range (71.1–86.9 V @ 1 mA), clamping transient energy within 1.0 ps response time. Its glass-passivated junction ensures stable leakage (<1 µA @ 64 V) and robust ESD immunity per IEC 61000-4-2.
Thermal design relies on RθJC = 10°C/W and RθJA = 55°C/W, enabling 3 W steady-state dissipation at 25°C ambient. The device meets ISO 7637-2 for automotive load-dump and inductive-switching immunity, with bidirectional variants (e.g., SMBJ64C) requiring explicit C-suffix marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 71.1 V / 86.9 V @ 1 mA - Ensures reliable turn-on margin above VWM for surge suppression |
| VC @ IPP | 114 V @ 5.5 A (10/1000 µs) - Limits downstream voltage stress during worst-case transients |
| PPK | 600 W - Peak pulse power handling capability for short-duration surges |
| ID @ VWM | <1 µA - Minimal leakage current preserves low-power system integrity |
| TJ max | +150°C - Enables operation in under-hood automotive environments |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint compatible with automated assembly |
Pinout & Package
DO-214AA (SMB) package: cathode-banded end denotes the cathode terminal; anode is the unmarked end. Matte tin-plated leads meet J-STD-002 solderability requirements. Polarity marking is critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connects to protected line; conducts surge current to ground when VREV > VBR |
| Anode (unmarked end) | Reference/ground return | Typically tied to system ground or low-impedance return path for clamping loop closure |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| Fast response time <1.0 ps | Clamps ESD and fast transients before sensitive ICs experience overvoltage damage |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive power-line immunity without external filtering components |
| J-STD-020 Level 1 moisture sensitivity | Enables standard reflow soldering without pre-bake, reducing manufacturing cost and risk |
| RoHS and halogen-free | Meets IEC 61249-2-21 for environmentally compliant PCB assembly |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Suppressing load-dump spikes (up to 120 V) on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input to clamp transients before regulator stage. Use Value: Limits peak voltage to 114 V, preventing damage to 36 V-rated input capacitors and enabling use of lower-cost 40 V MOSFETs in front-end protection. | Use Scenario: Shielding 24 V digital input modules from inductive kickback in factory automation solenoid drivers. IC Role / Device Role / Timing Role: Standoff protection across input terminals, triggered only during >71 V transients while maintaining <1 µA leakage during normal 24 V operation. Use Value: Eliminates need for series resistors or RC snubbers, preserving signal rise time and reducing BOM count by one passive component per channel. |
| LED Driver Overvoltage Clamp | ESD-Sensitive Sensor Interface |
Use Scenario: Protecting constant-current LED driver ICs from flyback voltage during hot-plug events in architectural lighting systems. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to clamp inductive energy from disconnected loads. Use Value: Clamps to 114 V within 1 ps, preventing latch-up in driver ICs rated for 100 V absolute maximum, extending field lifetime by >3× vs. unprotected units. | Use Scenario: Safeguarding I²C and analog sensor nodes (e.g., temperature, pressure) from human-body-model (HBM) ESD in HVAC control panels. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ < 100 pF) placed at connector entry point to shunt ESD before signal conditioning circuitry. Use Value: Maintains signal integrity up to 1 MHz due to sub-100 pF junction capacitance, avoiding data corruption in 400 kHz I²C buses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A | Narrower VBR range (71.1–78.6 V) and lower clamping voltage (103 V @ 6.1 A) | Better suited for tighter voltage margins where 114 V clamping exceeds downstream IC rating | Select SMBJ64A when protecting 100 V-rated components; SMBJ64 remains optimal for 120 V+ tolerant circuits |
| SMAJ64A | Lower PPK (400 W), same VWM/VBR, higher VC (115 V @ 3.5 A), SMA package | Reduced surge handling limits use to non-automotive, lower-energy transients | Choose SMAJ64A only for space-constrained consumer electronics with verified <400 W threat profiles |
Compared with SMBJ64A and SMAJ64A, the SMBJ64 offers the highest surge power rating (600 W) in DO-214AA, making it the preferred choice for automotive and industrial applications demanding full ISO 7637-2 compliance without layout changes.
Availability
SMBJ64 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O hardening, and LED driver overvoltage clamping requiring stable component supply across high-volume production cycles.
Supply support for SMBJ64 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and computing markets.
The SMBJ series was designed specifically for high-reliability transient suppression in harsh environments, emphasizing ISO 7637-2 compliance, J-STD-020 Level 1 process compatibility, and stable clamping performance across -55°C to +150°C.
FAQ
What is the clamping voltage of SMBJ64 under a 10/1000 µs surge?
The SMBJ64 clamps to a maximum of 114 V when subjected to a 5.5 A peak impulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and represents the upper limit of voltage seen by downstream circuitry during standardized surge testing. The SMBJ64 maintains this clamping performance consistently across its specified operating temperature range.
Is SMBJ64 unidirectional or bidirectional?
SMBJ64 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. Its cathode band marks the terminal that must be connected toward the protected line, with the anode tied to ground. For bidirectional protection, engineers must select SMBJ64C - a distinct part with symmetrical breakdown in both polarities and no polarity marking.
What is the maximum leakage current of SMBJ64 at its working voltage?
The SMBJ64 exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its 64 V working stand-off voltage (VWM), tested at 25°C ambient. This low leakage ensures minimal power loss in always-on systems and prevents false triggering in high-impedance sensing circuits. Leakage remains below 1 µA across the full -55°C to +125°C operating range.
Does SMBJ64 meet automotive transient immunity standards?
Yes, SMBJ64 meets ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a (battery disconnect), Pulse 2b (alternator load dump), and Pulses 3a/3b (capacitive coupling) requirements. Its 600 W peak pulse power rating and 114 V clamping voltage are validated for these waveforms, making SMBJ64 suitable for front-end protection in automotive body control modules and infotainment power supplies.
What is the thermal resistance from junction to ambient for SMBJ64?
The SMBJ64 has a junction-to-ambient thermal resistance (RθJA) of 55°C/W under standard JEDEC test conditions (single device on 1-inch² copper pad). This value enables 3 W steady-state power dissipation at 25°C ambient, but requires derating above 25°C per the published pulse derating curve (Fig.2). For high-power surge events, junction temperature rise is dominated by transient thermal impedance, not RθJA.
SMBJ64 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 114V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ64 FAQ
1.How can I place an order for SMBJ64 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ64 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 SMBJ64 reliable?
The price and inventory of SMBJ64 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ64 is usually 5 days.
3.What payment methods are accepted for SMBJ64?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ64 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ64?
SMBJ64 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ64 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 SMBJ64?
For technical support, including SMBJ64 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ64 requirements.
6.How does Aetrix verify that SMBJ64 is sourced from the original manufacturer or authorized distributors?
All SMBJ64 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 SMBJ64 meets industry standards.
7.What is the process for return or replacement of SMBJ64?
All SMBJ64 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ64, 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 SMBJ64 part is unused and in its original packaging.
Return procedure for SMBJ64:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ64 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
