My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ188A-M3/5A
- Part No.:
- SMAJ188A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ188A-M3/5A.pdf
- Description:
- TVS DIODE 188VWM 328VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,632
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ188A-M3/5A 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 188 V stand-off voltage (VWM), 209–231 V breakdown voltage (VBR at 1 mA), 328 A peak pulse current (IPPM) with 10/1000 μs waveform, and clamps to ≤328 V at rated surge, targeting IC, MOSFET, and sensor signal-line protection in industrial and automotive systems.
For engineers reviewing the SMAJ188A-M3/5A datasheet, SMAJ188A-M3/5A pinout, SMAJ188A-M3/5A application, or SMAJ188A-M3/5A equivalent, key selection criteria include unidirectional polarity, 400 W peak pulse power rating (derated to 300 W above 78 V), 1.0 μA max reverse leakage at VWM, 0.069 °C/W thermal resistance junction-to-lead, and halogen-free RoHS-compliant construction per M3 suffix.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance, enabling fast response (<1 ns) and repeatable clamping performance under repetitive 10/1000 μs surges at 0.01% duty cycle.
The SMAJ188A-M3/5A is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, supporting reliable operation in high-temperature environments without forced cooling. Its unidirectional configuration requires cathode-band orientation during PCB layout to ensure correct polarity-dependent clamping behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 188 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 209 V / 231 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across manufacturing lot and temperature. |
| IPPM | 328 A (10/1000 μs) - Peak surge current capability; determines maximum energy absorption (400 W up to 78 V, 300 W above). |
| VC | ≤328 V at IPPM - Clamped voltage during full-rated surge; directly limits stress on downstream components like microcontrollers or gate drivers. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage at stand-off voltage; prevents parasitic loading on high-impedance signal lines or battery-powered circuits. |
| TJ max | +150 °C - Maximum junction temperature rating; supports use in under-hood automotive or enclosed industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" × 0.157" footprint; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. Polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; connected to ground or lower-potential rail in unidirectional TVS configuration. | Provides low-impedance path to ground for transient current; must be routed with minimal inductance to preserve clamping speed. |
| Cathode | Current exit point during reverse-biased clamping; connected to protected line (e.g., signal or power rail). | Defines clamping reference; cathode-band marking ensures correct orientation to avoid open-circuit failure during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12–48 V DC rails without derating. |
| Glass passivated chip junction | Ensures stable VBR tolerance (±5%), low leakage drift over time, and immunity to humidity-induced parameter shift. |
| MSL Level 1 (J-STD-020) | Allows unlimited floor life and single reflow without baking; simplifies SMT assembly for high-reliability production lines. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU ELV directive; supports green manufacturing and end-of-life recycling. |
| AEC-Q101 qualification option | Available in HM3 variant; validates reliability for automotive powertrain and body electronics applications requiring 1000+ temperature cycles. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 24 V CAN bus transceivers and LIN nodes from load-dump transients and alternator ripple in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VCC rail and ground, absorbing >100 A pulses within nanoseconds. Use Value: Limits rail voltage to ≤328 V during ISO 7637-2 Pulse 5a (load dump), preventing latch-up or oxide rupture in 3.3 V/5 V interface ICs. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in PLC modules from ESD and inductive kickback. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) TVS mounted directly at connector entry point, shunting transients before signal conditioning amplifiers. Use Value: Maintains <10 mV baseline error in 4–20 mA loops while surviving ±8 kV contact ESD (IEC 61000-4-2) without degradation. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Safeguarding PoE-powered Ethernet switches and base stations against lightning-induced surges on 48 V DC input rails. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converters, coordinated with MOVs for multi-stage protection. Use Value: Withstands 328 A peak current at 10/1000 μs, limiting let-through energy to <100 mJ-well below SiC FET avalanche energy rating. |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: Fast-response TVS placed across motor terminals, clamping commutation spikes before they reach MCU GPIOs or H-bridge drivers. Use Value: Sub-1 ns response time prevents false triggering of overvoltage fault detection in motor control ICs, ensuring uninterrupted operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ188A-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial-grade industrial equipment where halogen-free mandate does not apply. | Select E3 if cost sensitivity outweighs halogen-free requirement; verify compliance with regional environmental regulations. |
| SMLJ188A-M3 | Higher 1500 W peak power rating (10/1000 μs), larger SMC (DO-214AB) package, same VWM/VBR. | Suitable for higher-energy surge environments (e.g., outdoor telecom cabinets) where board space allows larger footprint. | Choose SMLJ188A-M3 only when surge threat level exceeds 400 W; avoid in space-constrained designs due to 2.5× larger area. |
Compared with SMAJ188A-M3/5A, the E3 variant trades halogen-free status for lower cost in non-automotive settings, while the SMLJ188A-M3 delivers 3.75× higher surge capacity at the expense of PCB real estate and thermal mass-making SMAJ188A-M3/5A optimal for balanced cost, size, and 400 W protection in compact industrial modules.
Availability
SMAJ188A-M3/5A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power supply hardening requiring stable component supply, consistent M3 halogen-free compliance, and traceable lot-level documentation.
Supply support for SMAJ188A-M3/5A 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, precision, and application-specific optimization.
The SMAJ series was engineered for high-speed, high-energy transient suppression in space-constrained surface-mount applications-targeting automotive, industrial, and communications systems where consistent clamping and long-term stability are critical.
FAQ
What is the maximum clamping voltage of the SMAJ188A-M3/5A under full-rated surge conditions?
The SMAJ188A-M3/5A clamps to a maximum of 328 V when subjected to its rated 328 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and represents the upper limit of voltage imposed on protected circuitry during worst-case transient events. Designers must ensure downstream components have sufficient voltage margin above this clamping level.
Does the SMAJ188A-M3/5A meet automotive qualification standards?
The SMAJ188A-M3/5A itself is commercial-grade; however, Vishay offers an AEC-Q101 qualified version under the HM3 suffix (e.g., SMAJ188A-HM3). The M3 suffix confirms halogen-free and RoHS compliance but does not imply automotive qualification. For automotive applications requiring AEC-Q101, specify the HM3 variant and verify qualification status via Vishay's official product change notices or distributor parametric filters.
How does the thermal resistance of the SMAJ188A-M3/5A affect its surge handling capability?
The SMAJ188A-M3/5A has a typical junction-to-lead thermal resistance (RθJL) of 30 °C/W and junction-to-ambient (RθJA) of 120 °C/W. Under repetitive surge conditions, low RθJL enables rapid heat transfer to PCB copper, preventing thermal runaway during short-duration pulses. However, sustained power dissipation (>3.3 W) requires external heatsinking or reduced duty cycle to maintain TJ ≤ 150 °C.
Can the SMAJ188A-M3/5A be used in bidirectional protection circuits?
No-the SMAJ188A-M3/5A is strictly unidirectional, as indicated by the "A" suffix and cathode-band marking. For bidirectional protection, Vishay specifies the SMAJ188CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. Using SMAJ188A-M3/5A in bidirectional configurations risks open-circuit failure during negative transients due to lack of reverse avalanche capability.
What is the significance of the "/5A" in the SMAJ188A-M3/5A part number?
"/5A" denotes the preferred packaging configuration: 7500 units per 13-inch diameter plastic tape-and-reel, optimized for high-volume SMT assembly. It does not affect electrical or thermal specifications. Alternate packaging includes "/61" (1800 units on 7-inch reel). Both share identical device characteristics, and the choice depends solely on production throughput and feeder compatibility requirements for the SMAJ188A-M3/5A.
SMAJ188A-M3/5A 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):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 328V
- Current - Peak Pulse (10/1000µs):
- 910mA
- Power - Peak Pulse:
- 300W
- 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-214AC (SMA)
SMAJ188A-M3/5A FAQ
1.How can I place an order for SMAJ188A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ188A-M3/5A 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 SMAJ188A-M3/5A reliable?
The price and inventory of SMAJ188A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ188A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ188A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ188A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ188A-M3/5A?
SMAJ188A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ188A-M3/5A 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 SMAJ188A-M3/5A?
For technical support, including SMAJ188A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ188A-M3/5A requirements.
6.How does Aetrix verify that SMAJ188A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ188A-M3/5A 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 SMAJ188A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ188A-M3/5A?
All SMAJ188A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ188A-M3/5A, 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 SMAJ188A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ188A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ188A-M3/5A 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 …
