My Inquiry
My Account
Vishay General Semiconductor - Diodes Division P4SMA9.1CAHM3/I
- Part No.:
- P4SMA9.1CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA9.1CAHM3/I.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,917
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA9.1CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features 9.1 V breakdown voltage (VBR = 8.65–9.55 V at IT = 1.0 mA), 7.78 V standoff voltage (VWM), 13.4 V maximum clamping voltage (VC) at 29.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, sensor interfaces, and ICs in automotive and industrial control systems.
For engineers reviewing the P4SMA9.1CAHM3/I datasheet, P4SMA9.1CAHM3/I pinout, P4SMA9.1CAHM3/I application, or P4SMA9.1CAHM3/I equivalent, this device serves as a halogen-free, AEC-Q101-qualified TVS diode optimized for bidirectional surge suppression in space-constrained PCB layouts requiring high reliability under repetitive transient stress.
Technical Context
The P4SMA9.1CAHM3/I operates as a bidirectional avalanche diode, symmetrically clamping both positive and negative transients without polarity dependence. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<50 µA at VWM), while its MSL Level 1 rating supports lead-free reflow up to 260 °C.
Thermally, it exhibits RθJA = 120 °C/W and RθJL = 30 °C/W, enabling operation up to TJ = +150 °C. The device delivers 400 W peak pulse power below 91 V (derated to 300 W above 91 V), with fast response time <1 ns and low incremental surge resistance for effective ESD and lightning-induced transient suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 8.65 V / 9.55 V at IT = 1.0 mA - defines precise clamping onset threshold for bidirectional surges |
| VWM | 7.78 V - maximum continuous reverse operating voltage before leakage exceeds 50 µA |
| VC @ IPPM | 13.4 V at 29.9 A - clamped voltage during 400 W 10/1000 µs transient, limiting downstream stress |
| PPPM | 400 W - peak transient energy absorption capability under standard surge waveform |
| IPPM | 29.9 A - maximum non-repetitive surge current the device safely conducts without failure |
| TJ max. | +150 °C - enables use in under-hood automotive and high-ambient industrial environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H). No polarity marking - symmetrical bidirectional construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive transients and anode during negative transients - no fixed polarity |
| Cathode | Transient return path (bidirectional) | Identical electrical role to Anode; device functions identically regardless of orientation on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 400 W peak pulse power (10/1000 µs) | Supports robust immunity against IEC 61000-4-5 Level 4 surges (4 kV line-earth) in compact layout |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain, body electronics, and ADAS modules requiring zero-failure field performance |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT assembly without moisture sensitivity handling |
| Glass-passivated junction | Ensures stable VBR tolerance (±5%), low leakage drift over temperature, and long-term reliability |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control units from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential sensor pair or supply rail to limit transients to safe levels. Use Value: Prevents latch-up or damage to precision ADC inputs by clamping surges to ≤13.4 V while maintaining <50 µA leakage at 7.78 V. |
Use Scenario: Safeguarding CANH/CANL lines in factory automation nodes exposed to motor drive noise and ground bounce. IC Role / Device Role / Timing Role: TVS placed differentially between CANH and CANL to suppress common-mode transients without affecting signal integrity. Use Value: Maintains CAN signal rise/fall times due to low junction capacitance (~200 pF at VWM) and sub-ns response, ensuring bit-rate compliance up to 1 Mbps. |
| Consumer Power Adapter Input Stage | Telecom DSL Line Interface |
Use Scenario: Secondary-side overvoltage protection in 12 V wall adapters subjected to lightning-induced surges on DC output lines. IC Role / Device Role / Timing Role: Bidirectional clamp across output rails to absorb 400 W transients before reaching downstream regulators or USB ports. Use Value: Enables compact design with single P4SMA9.1CAHM3/I replacing dual unidirectional devices, reducing BOM count and PCB area. |
Use Scenario: Protecting ADSL/VDSL line drivers and receivers from induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Placed across line pair (tip/ring) to clamp longitudinal surges while preserving low-frequency voice band signals. Use Value: Low VWM (7.78 V) avoids interference with normal line signaling (±130 V DC bias), and 13.4 V clamping prevents IC damage during ring-trip events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0CA | Higher package thermal resistance (RθJA ≈ 150 °C/W), same VBR range but 600 W PPPM rating | Requires larger pad layout for equivalent thermal performance; suited for higher-energy surges where board space allows SMB footprint | Select when higher peak power margin is needed and PCB real estate permits larger SMB (DO-214AA) package |
| 1.5SMC9.0CA | Same VBR/VC, but SMC package (DO-214AB) with higher IPPM (33.3 A) and 1500 W PPPM; not AEC-Q101 qualified | Lacks automotive qualification; better for industrial mains-input protection where qualification is not required | Choose for cost-sensitive industrial power supplies needing higher surge margin without automotive compliance |
Compared with SMBJ9.0CA and 1.5SMC9.0CA, the P4SMA9.1CAHM3/I offers optimal balance of AEC-Q101 qualification, compact SMA footprint, and verified 400 W surge capability - making it preferred for space-constrained automotive and portable electronics where qualification and size are critical.
Availability
P4SMA9.1CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, consumer power adapters, and telecom line interfaces requiring stable component supply with full traceability and lifecycle continuity.
Supply support for P4SMA9.1CAHM3/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 P4SMA Series is engineered for high-reliability transient suppression in automotive, industrial, and communications equipment - delivering standardized TVS performance in compact, qualified surface-mount packages.
FAQ
What is the breakdown voltage tolerance for P4SMA9.1CAHM3/I?
The P4SMA9.1CAHM3/I has a specified breakdown voltage range of 8.65 V to 9.55 V at test current IT = 1.0 mA, corresponding to ±5 % tolerance around the nominal 9.1 V rating. This tight VBR distribution ensures consistent clamping behavior across production lots and supports reliable system-level surge margining in designs using P4SMA9.1CAHM3/I.
Is P4SMA9.1CAHM3/I suitable for automotive applications?
Yes, P4SMA9.1CAHM3/I is AEC-Q101 qualified (denoted by the HM3 suffix), having passed stress tests including temperature cycling, high-temperature reverse bias, and ESD per JESD22. It is approved for use in automotive body electronics, infotainment, and ADAS subsystems where bidirectional transient protection is required - making P4SMA9.1CAHM3/I appropriate for under-hood and cabin environments up to +150 °C junction temperature.
How does the clamping voltage of P4SMA9.1CAHM3/I compare to its standoff voltage?
The P4SMA9.1CAHM3/I has a standoff voltage VWM of 7.78 V and a maximum clamping voltage VC of 13.4 V at 29.9 A. This 5.62 V clamping margin ensures protected circuits remain well below damage thresholds during transients, while the low VWM prevents interference with normal 9 V or 12 V system operation - a key design advantage of P4SMA9.1CAHM3/I in low-voltage interface protection.
What is the peak pulse current rating for P4SMA9.1CAHM3/I?
The P4SMA9.1CAHM3/I is rated for a peak pulse current IPPM of 29.9 A under the standard 10/1000 µs double-exponential waveform. This value is derived directly from its 400 W peak pulse power rating and 13.4 V clamping voltage (IPPM = PPPM/VC). The rating assumes mounting on 0.2" × 0.2" copper pads - actual IPPM may decrease with reduced thermal mass, so proper PCB layout is essential for achieving full P4SMA9.1CAHM3/I performance.
Does P4SMA9.1CAHM3/I require polarity-aware placement on the PCB?
No, P4SMA9.1CAHM3/I is a bidirectional TVS diode with symmetrical construction and no polarity marking. Both terminals are functionally identical - it clamps equally for positive and negative transients regardless of orientation. This eliminates assembly errors and simplifies layout, distinguishing P4SMA9.1CAHM3/I from unidirectional variants like P4SMA9.1A that require cathode-band alignment.
P4SMA9.1CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7.78V
- Voltage - Breakdown (Min):
- 8.65V
- Voltage - Clamping (Max) @ Ipp:
- 13.4V
- Current - Peak Pulse (10/1000µs):
- 29.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA9.1CAHM3/I FAQ
1.How can I place an order for P4SMA9.1CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA9.1CAHM3/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 P4SMA9.1CAHM3/I reliable?
The price and inventory of P4SMA9.1CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA9.1CAHM3/I is usually 5 days.
3.What payment methods are accepted for P4SMA9.1CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA9.1CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA9.1CAHM3/I?
P4SMA9.1CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA9.1CAHM3/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 P4SMA9.1CAHM3/I?
For technical support, including P4SMA9.1CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA9.1CAHM3/I requirements.
6.How does Aetrix verify that P4SMA9.1CAHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA9.1CAHM3/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 P4SMA9.1CAHM3/I meets industry standards.
7.What is the process for return or replacement of P4SMA9.1CAHM3/I?
All P4SMA9.1CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA9.1CAHM3/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 P4SMA9.1CAHM3/I part is unused and in its original packaging.
Return procedure for P4SMA9.1CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA9.1CAHM3/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 …
