My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ70CAHM3P/H
- Part No.:
- SMAJ70CAHM3P/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70CAHM3P/H.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,419
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ70CAHM3P/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 70 V standoff voltage (VWM), 77.8–86.0 V breakdown range (VBR), and clamps transients to ≤113 V at 3.5 A peak pulse current (IPPM), with 400 W peak pulse power (10/1000 μs waveform). It is widely deployed in automotive sensor signal lines, industrial I/O interfaces, and telecom power rails.
For engineers reviewing the SMAJ70CAHM3P/H datasheet, SMAJ70CAHM3P/H pinout, SMAJ70CAHM3P/H application, or SMAJ70CAHM3P/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, SMA (DO-214AC) package compatibility, and compliance with UL 497B for surge protector classification.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 70 V), while the low incremental surge resistance supports effective energy diversion during fast transients.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its response time is sub-nanosecond, and it meets MSL Level 1 per J-STD-020 with peak reflow at 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for protected circuitry. |
| VBR min/max | 77.8 V / 86.0 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering across process and temperature variation. |
| VC @ IPPM | ≤113 V at 3.5 A - Clamped voltage under 10/1000 μs surge; determines maximum stress imposed on downstream ICs or MOSFETs. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power handling; defines transient energy absorption capacity per standardized waveform. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against accidental DC overcurrent events. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount package with 2.54 mm lead pitch; compatible with automated placement and reflow soldering. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and no polarity marking for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One side of symmetrical PN junction; forms bidirectional conduction path with Cathode terminal. |
| Cathode | Terminal K | Other side of symmetrical PN junction; no band marking distinguishes terminals in bidirectional configuration. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-hood and ADAS sensor modules. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from inductive load switching (e.g., solenoid drivers, motor controllers) without degradation. |
| Low clamping voltage (VC ≤ 113 V) | Minimizes voltage overshoot on protected lines, preserving margin for 75 V-rated components like automotive CAN transceivers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related delamination or popcorn failure. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental compliance requirements for industrial and automotive OEM supply chains. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching precision ADC front-end. Use Value: Maintains signal integrity by limiting transient excursions to ≤113 V, preventing latch-up or damage to 12-bit SAR ADCs with 80 V absolute max ratings. |
Use Scenario: Safeguarding RS-485 transceiver data lines in factory automation PLCs subjected to EFT bursts and lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response TVS placed across differential pair (A/B) to suppress common-mode transients while preserving signal rise/fall times. Use Value: Sub-nanosecond response and low capacitance (<50 pF) prevent data corruption at 25 Mbps baud rates without adding jitter or skew. |
| Telecom Power Rail | Consumer USB Port Protection |
|
Use Scenario: Guarding 48 V DC power inputs of PoE-powered network switches against induced surges from nearby AC mains wiring. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converter input, coordinated with secondary MOV and fuse. Use Value: 400 W pulse rating absorbs up to 400 mJ per event (per 10/1000 μs), extending system uptime in outdoor telecom cabinets. |
Use Scenario: Providing secondary-level surge suppression on VBUS line of USB-C ports in smart home hubs exposed to user-handling ESD. IC Role / Device Role / Timing Role: Secondary TVS after primary ESD array, targeting higher-energy events beyond ±8 kV contact discharge. Use Value: AEC-Q101 qualification ensures consistent performance across 1000+ ESD strikes, supporting 10-year consumer product lifecycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70CAHE3_A/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free packaging (E3 vs HM3). | Acceptable for non-automotive industrial use where halogen-free mandate is not enforced. | Select when cost sensitivity outweighs halogen-free requirement and full automotive traceability is not needed. |
| SMBJ70CAHM3 | Higher 600 W peak pulse power (10/1000 μs), same VWM/VC, but larger SMB (DO-214AA) package. | Better suited for high-energy industrial motor drives where PCB space allows larger footprint. | Choose when surge energy exceeds 400 W capability and layout permits 5.3 mm × 4.6 mm SMB footprint. |
Compared with SMAJ70CAHE3_A/H, the SMAJ70CAHM3P/H adds halogen-free compliance for strict automotive Tier-1 supply chains; versus SMBJ70CAHM3, it trades 200 W pulse power for 30% smaller board area and identical thermal performance on standard pads.
Availability
SMAJ70CAHM3P/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial I/O systems, telecom power supplies, and consumer USB-C interface designs requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ70CAHM3P/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in harsh environments - particularly targeting automotive, industrial, and telecom applications where compact size, AEC-Q101 validation, and repeatable clamping performance are critical.
FAQ
What does the 'HM3' suffix indicate in SMAJ70CAHM3P/H?
The 'HM3' suffix in SMAJ70CAHM3P/H denotes halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. It also confirms AEC-Q101 qualification for automotive use, distinguishing it from commercial-grade E3 variants. This makes SMAJ70CAHM3P/H suitable for Tier-1 automotive suppliers requiring full material compliance documentation.
Is SMAJ70CAHM3P/H unidirectional or bidirectional?
SMAJ70CAHM3P/H is a bidirectional TVS diode, as confirmed by the 'CA' suffix in its part number. It provides symmetrical clamping in both polarities, making it ideal for protecting AC-coupled signals, differential buses (e.g., RS-485), or circuits where voltage polarity reversal may occur. Unlike unidirectional versions, it has no cathode band marking.
What is the maximum clamping voltage for SMAJ70CAHM3P/H at its rated peak pulse current?
The maximum clamping voltage (VC) for SMAJ70CAHM3P/H is 113 V at 3.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 75 V-rated downstream components.
Can SMAJ70CAHM3P/H be used in place of SMAJ70A in a design?
No - SMAJ70CAHM3P/H is bidirectional, while SMAJ70A is unidirectional. Substituting them requires verifying circuit polarity constraints: SMAJ70A has a cathode band and conducts only in reverse bias, whereas SMAJ70CAHM3P/H clamps equally in both directions. Using SMAJ70CAHM3P/H in a unidirectional application may cause unintended conduction if forward voltage exceeds ~3.5 V.
What is the thermal resistance of SMAJ70CAHM3P/H, and how does it affect PCB layout?
SMAJ70CAHM3P/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, designers must provide adequate copper area and avoid excessive trace length between pads and ground/power planes - especially in automotive under-hood applications where ambient temperatures exceed 85 °C.
SMAJ70CAHM3P/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ70CAHM3P/H FAQ
1.How can I place an order for SMAJ70CAHM3P/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70CAHM3P/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 SMAJ70CAHM3P/H reliable?
The price and inventory of SMAJ70CAHM3P/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ70CAHM3P/H is usually 5 days.
3.What payment methods are accepted for SMAJ70CAHM3P/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70CAHM3P/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70CAHM3P/H?
SMAJ70CAHM3P/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70CAHM3P/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 SMAJ70CAHM3P/H?
For technical support, including SMAJ70CAHM3P/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70CAHM3P/H requirements.
6.How does Aetrix verify that SMAJ70CAHM3P/H is sourced from the original manufacturer or authorized distributors?
All SMAJ70CAHM3P/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 SMAJ70CAHM3P/H meets industry standards.
7.What is the process for return or replacement of SMAJ70CAHM3P/H?
All SMAJ70CAHM3P/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70CAHM3P/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 SMAJ70CAHM3P/H part is unused and in its original packaging.
Return procedure for SMAJ70CAHM3P/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70CAHM3P/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 …
