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Microchip Technology SHA105-TFLXAUTHS
- Part No.:
- SHA105-TFLXAUTHS
- Manufacturer:
- Microchip Technology
- Category:
- Specialized ICs
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Description:
- TRUST FLEX HOST MAC, 105C, I2C,
- Quantity:
Unit Price:$0
Ext Price:$0
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- Shipping:
Product Details
SHA105-TFLXAUTHS - TrustFLEX Host-Side Authentication IC
SHA105-TFLXAUTHS from Microchip Technology is the 8-lead SOIC, I2C host-side TrustFLEX CryptoAuthentication device. It validates a client-generated MAC in a symmetric-key accessory authentication design.
Technical basis: Microchip SHA105-TFLXAUTH Data Sheet DS40002504, revision B. No current price or inventory claim is included.
Overview
The SHA105-TFLXAUTH is a pre-provisioned TrustFLEX host-side authentication IC. In Microchip's paired architecture, a SHA104-TFLXAUTH client generates a message authentication code and the SHA105 host device uses CheckMAC to validate the response. Its symmetric secret is protected in hardware, reducing exposure to host firmware. Pairing, key enrollment and protocol integration still require system-level validation.
Key Advantages
CheckMAC validates a client-generated authentication response.
Symmetric key material remains in dedicated secure hardware.
Pre-provisioned configuration supports a defined authentication use case.
The S ordering suffix selects an 8-lead narrow-body SOIC package.
Feature Summary
Hardware CheckMAC operation supports host verification.
Fast-mode communication supports operation up to 400 kHz.
A symmetric secret, I/O protection key and user EEPROM are available under device policy.
A unique 72-bit serial number supports device identification.
Package & Footprint
The registered package is 8-SOIC (0.154", 3.90mm Width). Microchip's S ordering code denotes the 8-lead SOIC option. The local image is a generic package illustration, not a controlled mechanical drawing or a device marking reference.
- Confirm pin 1 and land pattern against the current Microchip drawing.
- Place VCC decoupling close to the device.
- Check I2C pull-ups and voltage compatibility.
Pin Functions
For the 8-lead SOIC: pins 1, 2, 3 and 7 are NC; pin 4 is GND; pin 5 is SDA; pin 6 is SCL; and pin 8 is VCC. Confirm orientation against the manufacturer pinout before PCB release.
Key Specifications
| Exact order code | SHA105-TFLXAUTHS |
|---|---|
| Manufacturer | Microchip Technology |
| Role | TrustFLEX host-side symmetric authentication |
| Package | 8-lead SOIC; registered 8-SOIC (0.154", 3.90mm Width) |
| Interface | I2C, up to 400 kHz fast mode |
| Supply voltage | 1.65 V to 5.5 V |
| Operating temperature | -40°C to +105°C |
| Authentication function | CheckMAC verification of client response |
| Protected keying | One symmetric key and I/O protection key |
| User memory | 384-byte EEPROM |
| Serial number | Unique 72-bit value |
| Additional resources | True random-number generator and monotonic counter |
Check device revision, provisioning and electrical conditions in the manufacturer data sheet.
Replacement Considerations
This host-side SHA105 device is not a drop-in substitute for a SHA104 client or an asymmetric ECC secure element. Compare provisioned keys, CheckMAC flow, interface voltage, package and host software before substitution. No unverified internal alternative link is included.
Manufacturer Information
Microchip identifies SHA105-TFLXAUTHS as the 8-lead SOIC I2C TrustFLEX host-side ordering option in SHA105-TFLXAUTH CryptoAuthentication Data Sheet DS40002504. Consult that document, current errata and the approved TrustFLEX provisioning documentation for implementation details.
Applications
Validate an accessory's client-side MAC before enabling host features.
Authenticate a compatible disposable or replaceable module.
Use with a correctly provisioned SHA104-TFLXAUTH client.
Keep the verification key outside general-purpose host memory.
Quality & Authenticity
Verify the exact -TFLXAUTHS order code, package marking, lot traceability and expected provisioning state. The generic package image does not establish authenticity. Confirm CheckMAC responses using a known compatible client and a defined acceptance test.
FAQ
Is this the client-side device?
No. SHA105-TFLXAUTH is the host-side verifier; the paired SHA104-TFLXAUTH is the client in Microchip's described flow.
Does it implement ECC or TLS by itself?
No such claim is made for this symmetric CheckMAC authentication part.
What package is the S option?
The S suffix specifies the 8-lead SOIC ordering option.
Can any SHA104 device be paired?
Key provisioning and protocol compatibility must be verified for the actual devices.
Engineering Notice
Security depends on the complete protocol, protected keys, provisioning controls and host response to authentication failure. Review current Microchip documentation and electrical limits; validate I2C timing, pull-ups, counter behavior and expected credential lifecycle in the final system.
SHA105-TFLXAUTHS Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- CryptoAuthentication™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Authentication Chip
- Applications:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
- Grade:
- -
- Qualification:
- -
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